JP2003051170A - Shutter for disk cartridge and disk cartridge - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a shutter for a disk cartridge which is satisfactory in sliding properties and light in weight and whose warp in the direction of plate thickness is suppressed and to provide a disk cartridge wherein an aperture can be opened and closed with appropriate driving force. SOLUTION: A shutter body 112 and a shutter surface plate 151 applied to a disk cartridge 10 open and close the aperture 14 for accessing a disk media 20 of the disk cartridge 10 while sliding with a lower surface plate part 36. The shutter body 112 and the shutter surface plate 151 consist of two-layer structure of a resin layer and a metal layer to enhance the sliding properties and lightness in weight. The joining surface of a metal plate constituting the metal layer is subjected to electrochemical surface treatment to enhance the affinity to the resin and the metal plate and the resin layer are strongly joined to each other to suppress the warp of the resin layer.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a disc cartridge shutter for opening and closing an opening provided in a disc cartridge rotatably accommodating a disc-shaped disc medium used as a recording / reproducing medium for an information processing apparatus or the like. .

The present invention also relates to a disk cartridge for rotatably accommodating a disk-shaped disk medium used as a recording / reproducing medium for an information processing apparatus or the like to prevent intrusion of dust and the like.

[0003]

2. Description of the Related Art For example, disk-shaped disk media such as optical disks and magneto-optical disks are used as portable recording / reproducing media for computers. When recording or playing back such disc media,
By irradiating the recording surface with the laser light while being rotated while being loaded in the drive device, information is recorded by pit formation due to decomposition of the dye layer on the recording surface, phase change, magnetization, or the like. The recorded information is reproduced based on the difference in reflectance and polarization angle.

Further, in such a disk medium,
In order to increase the recording capacity, it has been proposed to shorten the wavelength of laser light with which the recording surface is irradiated. When information is recorded or reproduced using this short-wavelength laser light (for example, a blue-violet laser), in order to suppress the attenuation of the laser light by the cover layer that protects the recording surface of the disc medium, It is necessary to reduce the thickness. When the thickness of the cover layer is reduced in this way, the diameter of the laser beam on the surface of the cover layer (exposed surface to the outside) becomes small, and the influence of dust and the like adhering to the surface of the cover layer cannot be ignored.

For this reason, a disc cartridge has been adopted in which the disc medium is housed in a case to prevent dust and the like from adhering to the disc medium. Such a disc cartridge is provided with an opening for exposing the center hole portion provided in the central portion of the disc medium and a part of the recording surface (cover layer) to the outside, and a shutter member for opening and closing the opening. It is configured.

Accordingly, in the disc cartridge,
When the disc medium is not in use, the shutter member closes the opening to prevent dust and other foreign matter from entering the disc cartridge (that is, dust and other substances that adhere to the disc medium), and to the drive device when the disc medium is used. It is possible to hold the center hole portion by the rotating spindle shaft and to bring the laser head close to the recording surface (irradiation of laser light) by opening the opening in association with the loading.

However, in the above-mentioned disc cartridge, there is a problem that it is difficult to reduce the size of the disc cartridge because it is necessary to secure a space for accommodating the shutter member in the above-mentioned opening state.

Therefore, in order to reduce the size, a disk cartridge having a shutter member divided into two parts has been proposed (for example, Japanese Patent Laid-Open No. 2000-30394). Hereinafter, the disk cartridge described in this publication is shown in FIG.
4 will be described.

FIG. 44 shows a disk cartridge 400.
Is shown in an exploded perspective view. As shown in this figure, the disc cartridge 400 is configured such that a disc-shaped disc medium 406 is rotatably accommodated in a case formed by joining an upper shell 402 and a lower shell 404 each made of a resin material.

The lower shell 404 has a cylindrical wall 4 as an inner wall for accommodating the disk medium 406 therein.
04A and an opening 408 cut out from the front part of the cylindrical wall 404A to the substantially central part of the lower shell 404.

The opening 408 is an opening 4 for inserting (nearing) the laser head along the radial direction of the disk medium 406.
08A and the center hole portion 40 of the disk medium 406
6A-compatible opening 408B for inserting the spindle shaft
And the disk media 406.
It is for access to.

The disk cartridge 400 also has a first shutter member 410 and a second shutter member 412 for opening and closing the opening 408. The first shutter member 410 is formed in a substantially trapezoidal shape and mainly opens and closes an opening 408A, and a shutter body 414 is erected at a front end of the shutter body 414 and formed in an arc shape corresponding to the cylindrical wall 404A. And a shutter guide portion 416 that opens and closes a notch portion (a rising portion of the opening 408A) in the front portion of the cylindrical wall 404A.

Further, a thin plate-like connecting portion 418 which is deformable in the plate thickness direction is connected to one end of the shutter guide portion 416, and a block-like operating portion 418A is provided at the tip of the connecting portion 418. . Shutter guide section 416
The connecting portion 418 and the connecting portion 418 are connected to each other by being integrally molded, or manufactured as a separate body and then fixed (fixed) by adhesion, welding, crimping, or the like.
The tensile force (operating force) acting on the shutter guide portion 41
6, the shutter guide portion 416 is rotated.

On the other hand, the second shutter member 412 is formed in the shape of a long trapezoid and has a rotating shaft 412 provided at its end.
The opening 408B is mainly opened and closed by rotating around C. Further, the rotation shaft 4 of the second shutter member 412
A spring-hanging pin 412D is provided upright in the vicinity of 12C. The rotating shaft 412C and the pin 412D are inserted into the shaft hole 404B and the guide hole 404C of the lower shell 404 from below, respectively, and are located outside the cylindrical wall 404A in the lower shell 404.

In this state, the rotating shaft 412C is inserted through the annular portion of the torsion spring 419, and the short rod portion of the torsion spring 419 is hooked on the pin 412D. The long bar portion of the torsion spring 419 is brought into contact with an appropriate position of the lower shell 404, whereby the second shutter member 4
12 is biased in the closing direction of the opening 408B.

The disk cartridge 400 includes the first and second shutter members 410 and 412 as the lower shell 4.
The cover member 420 accommodates the cover member 420 so as to be movable between the cover member 04 and the case 04. This cover member 420 also has an opening 4
An opening 422 for access to the disk medium 406 corresponding to 08 is formed.

The disk cartridge 400 is
When the disc medium 406 is not used, the shutter body 414 of the first shutter member 410 and the second shutter member 412 abut the end surfaces 414A, 412A against each other to close the openings 408, 422. Specifically, the first shutter member 410 opens the opening 40.
8A is mainly closed, and the second shutter member 412 opens the opening 4
08B is mainly closed. Also in this state,
Shutter guide portion 416 of first shutter member 410
Is for closing the rising portion of the opening 408A (the notch in the front portion of the cylindrical wall 404A).

On the other hand, when the disc medium 406 is used, the disc cartridge 400 is loaded into the drive device, and the end surfaces 414A and 412A of the first and second shutter members 410 and 412 are moved in the directions away from each other to form the opening 408. 422 is opened.

More specifically, the operation portion 418A fixed to the tip of the connecting portion 418 of the first shutter member 410 is attached to the drive device, and the operation portion 418A is formed in the guide groove 424 on the side surface of the case.
When the shutter guide portion 416 is moved in the direction of the arrow P along the arrow (the connecting portion 418 is pulled), the shutter guide portion 416 moves to the cylindrical wall 404.
While being guided along the outer peripheral surface of A, the shutter body 414 of the first shutter member 410 rotates in the direction of arrow Q around the axis of the cylindrical wall 404A (that is, the disk medium 406).

With this rotation, the first shutter member 4
10 is a convex portion 414 located along the end surface 414A.
In B, the engaging portion 412B located along the end surface 412A of the second shutter member 412 is pressed, and the second shutter member 412 is rotated in the arrow R direction around the rotation shaft 412C. That is, the first shutter member 410 and the second shutter member 412 rotate in different directions while interlocking with each other to open the openings 408 and 422. In this state, the window portion 416 provided in the shutter guide portion 416
A is located in front of the cylindrical wall 404A
The notch (opening 408A) is opened.

At this time, the shutter body 414 and the second shutter member 412 of the first shutter member 410 slide along the sliding recesses (not shown) formed on the lower surface of the lower shell 404. In addition, the shutter guide portion 416 of the first shutter member 410 includes the cylindrical wall 40.
Slide along 4A. Further, the first shutter member 4
Since the 10 and the second shutter member 412 rotate in mutually different directions, the convex portion 414B and the engaging portion 412B that interlock these slide with each other.

Further, in the disc cartridge 400,
The engaging portion 412 of the second shutter member 412 while rotating around the axis of the cylindrical wall 404A (disk medium 406).
The convex portion 414B of the first shutter member 410 (shutter body 414) that presses (pushes) B causes the second shutter member 412 to be opened to the opening position of the opening 408B by pressing the first shutter member 410 by a predetermined amount of rotation. In order to rotate up to (to secure a pressing stroke), it is provided apart from the axis of the cylindrical wall 404A that is the center of rotation.

On the other hand, when the opened openings 408 and 422 are closed again, the operating portion 418A is pressed by the drive device in the direction opposite to the arrow P direction, or the first shutter member is biased by the torsion spring 419. 410
Is pressed against the engaging portion 412B of the second shutter member 412 at the convex portion 414B, so that the first and second shutter members 410 and 412 respectively close the openings 408 and the like (arrow Q and arrow R directions. (In the opposite direction) to close the openings 408, 422.

As a result, the first shutter member 410 and the second shutter member 412 are housed in a housing space substantially corresponding to the projected area of the disk-shaped disk medium 406, and the disk cartridge 40.
No. 0 is downsized. Further, the first shutter member 410 and the second shutter member 412 are arranged on the same plane, and the end surfaces of the first shutter member 410 and the second shutter member 412 are abutted against each other as described above, and the opening 408,
In order to block 422, the disc cartridge 400 is made thin.

On the other hand, when assembling the disc cartridge 400, the disc medium 406 is housed (placed) inside the cylindrical wall 404A of the lower shell 404 with the opening 408 of the lower shell 404 closed by the shutter members 410 and 412. ), And the upper part is covered with the upper shell 402. Next, after assembling each part such as the locking means (not shown), the lower portion of the lower shell 404 (case) is covered with the cover member 420.

[0026]

However, the conventional disc cartridge 400 as described above has the following problems.

First, in the first shutter member 410,
The width dimension of the shutter body 414 (see FIG. 4) is provided in order to provide the convex portion 414B arranged at a position separated from the axial center of the cylindrical wall 404A (to secure the position) with a simple structure as described above.
The dimension W shown in FIG. 4 is wider than the dimension enough to close the opening 408A (by the amount of the protrusion 414B installed), and the protrusion 414B corresponding to the end face 414A is formed in the enlarged portion.
Is provided.

Therefore, the first shutter member 410 is
There is a problem that the weight is increased by the width of the shutter main body 414 and the sliding area with the lower shell 404 (case) is increased to increase the sliding resistance.

On the other hand, since the second shutter member 412 has a long shape in which the rotating shaft 412C provided at one end thereof and the opening 408B (the central portion of the case) which is mainly opened and closed are separated from each other, There is a problem that the second shutter member 412 has a large weight, a large sliding area with the lower shell 404 (case) when opening / closing the opening 408, and a large sliding resistance.

As described above, the first shutter member 410,
Second shutter member 412 and lower shell 404 (case)
If the sliding resistance to and is large or (and) the weight of each shutter member 410, 412 is large, the driving force for opening and closing the opening 408 becomes large.

If the driving force for opening and closing the opening 408 is large, not only the smooth operation of the first shutter member 410 and the second shutter member 412 is hindered, but also each part of the first shutter member 410 (the above-mentioned connecting part 418). (Including the operating portion 418A) is required, which causes a high cost.

If the driving force for opening and closing the opening 408 is large, when the operation portion 418A is pressed in the direction opposite to the arrow P when the opening 408 is closed, buckling or the like of the thin plate-like connecting portion 418 may occur. The opening 4 may cause deformation.
In the configuration that utilizes the biasing force of the torsion spring 419 that biases the second shutter member 412 when 08 is closed, it is necessary to increase the biasing force of the torsion spring 419 (increase the spring constant).

When the biasing force of the torsion spring 419 is increased (the spring constant is increased), the handling of the torsion spring 419 is complicated and the assembling property is deteriorated. In particular,
In the disk cartridge 400, the torsion spring 41
The biasing force of 9 causes the rotation shaft 412 of the second shutter member 412.
Since it acts on the pin 412D near C, the rotational moment in the closing direction of the opening 408 of the second shutter member 412 due to this biasing force is small, and it is necessary to further increase the spring constant. For this reason, this problem (deterioration of assembling property) becomes remarkable, and the torsion spring 419 itself needs to be increased in size, and the disk cartridge 400 is increased in size as a whole, or each shutter member 410, 41.
2 becomes smaller (that is, the opening 408 becomes smaller, which makes it impossible to accommodate a large laser head, etc.)
Do

Further, if the weight of the second shutter member 412 is large, for example, when the disc cartridge 400 is dropped by mistake, an excessive load acts on the rotary shaft 412C, which may cause deformation or damage of the rotary shaft 412C. It can be a cause.

In particular, if the second shutter member 412 is made of a metal material in consideration of ensuring the flatness of the second shutter member 412 and preventing deformation due to temperature, the problems due to the weight and sliding resistance become remarkable. Become.

Therefore, in order to improve the slidability and reduce the weight, at least one of the first shutter member 410 (shutter body 414) and the second shutter member 412 may be made of resin. Each shutter member 410, Four
Since the area of 12 is large, the disk cartridge 400
With the wall thickness required for each shutter member 410, 412 (a value close to the minimum limit wall thickness by normal injection molding) for thinning, the shutter member 410, 412 cannot be allowed due to residual stress during molding ( In some cases, there was a warp that interferes with the opening / closing operation of the opening. In particular, when each of the shutter members 410 and 412 has a non-uniform thickness portion (for example, when the protrusion 414B and the pin 412D are integrally formed or when ribs are provided), this problem becomes remarkable.

Therefore, each shutter member 410, 41
Insert molding using a thin metal plate is also conceivable in order to correct (prevent or suppress) the warp of 2.
Since it is difficult to bond resin and metal, it is necessary to have an embedded structure in which holes and recesses are provided in the metal plate. However, when such a buried structure is adopted, the resin layer has a non-uniform thickness and a large residual stress. For this reason, the resin layer may be partially peeled off or cracked from the metal plate, which may cause a failure in opening / closing operation of the opening 408 or a decrease in yield during manufacturing.

Second, the second shutter member 412 has the first
Since a part of the opening 408A for inserting the laser head is also closed in the state of abutting the shutter member 410, the second
An acute angle portion 412E is formed at a position farthest from the rotation shaft 412C of the shutter member 412.

For this reason, the acute angle portion 412 is accompanied by the above rotation.
E is slidable on the lower shell 404 (case) or cover member 420 made of a resin material to cover the case or cover member 4
20 may wear. Similarly to the acute angle portion 412E, the other corners of the second shutter member 412 may cause abrasion of the case or the cover member 420 due to sliding.

In particular, the second shutter member 412 has a long shape extending from a corner portion (a mounting portion of the shaft hole 404B for supporting the rotating shaft 412C shaft) of the lower shell 404 (case) to a central portion (forming portion of the opening 408B). Therefore, the second shutter member 412 is apt to warp due to the curl of the material and the residual stress at the time of molding, and there is a high possibility that the second shutter member 412 will be worn due to the sliding.

This lower shell 404 or cover member 42
The wear of 0 not only hinders the smooth operation of the second shutter member 412, but also generates wear powder and when the wear powder adheres to the recording surface (cover layer) of the disk medium 406, a recording or reproduction signal is lost (so-called). Cause dropout).

Third, the first shutter member 410 and the second shutter member 410
If the shutter member 412 and the shutter member 412 are made of the same material,
Abrasion occurs at the contact (pressing) portion between the convex portion 414B of the first shutter member 410 and the engaging portion 412B of the second shutter member 412 that slide with each other when the opening 408 is opened and closed.
When the abrasion powder due to this abrasion adheres to the recording surface (cover layer) of the disk medium 406, it causes the loss of a recording or reproducing signal (so-called dropout) as in the second problem.

In particular, the first shutter member 410 and the second shutter member 410
If the shutter members 412 are both made of a metal material in order to secure the flatness, metal powder due to abrasion is likely to be generated.

Further, when the first shutter member 410 and the second shutter member 412 are made of the same material, the hardness at the abutting portion becomes approximately the same, and abnormal noise is generated when the opening 408 is opened and closed. It can be a cause.

Fourthly, in the disc cartridge 400, the shutter main body 414 is simply rotatably housed between the lower shell 404 (case) and the cover member 420, and the shutter guide portion 416 slides on the cylindrical wall 404A. In other words, the first shutter member 410 is not held by the lower shell 404 (case) and is simply prevented from falling off from the case by the cover member 420 because it is only movably arranged. Therefore, when assembling the disc cartridge 400 (when assembling each component before mounting the cover member 420), the first shutter member 410 could not be prevented from coming off the case.

Therefore, when assembling the disc cartridge 400, a complicated and careful work is required so that the first shutter member 410 does not fall out of the case, and there is a problem that the assembling workability is poor.

Similarly, in the disc cartridge 400, the rotary shaft 412C provided at one end of the second shutter member 412 is simply inserted into the shaft hole 404B of the lower shell 404 and the annular portion of the torsion spring 419. In other words, in other words, the second shutter member 412 is not held by the case, and the cover member 420 merely prevents the second shutter member 412 from falling off the case. Therefore, when the disc cartridge 400 is assembled (the cover member 420). The second shutter member 412 when assembling each component before mounting the).
I couldn't prevent the fall from the case.

Therefore, when assembling the disc cartridge 400, a complicated and careful work is required so that the second shutter member 412 does not drop from the case, and there is a problem that the assembling workability is poor.

Fifthly, in the disc cartridge 400, since the rotary shaft 412C fixed to one end of the second shutter member 412 is simply formed in a columnar shape, the base portion of the rotary shaft 412C (second Shutter member 412
The boundary portion with the flat plate portion) has a structure in which stress concentration easily occurs.

For this reason, as pointed out in the first problem, for example, when the disc cartridge 400 is dropped due to an error, the drop impact causes relative movement with the lower shell 404 (case) of the second shutter member 412. A shock force acts between the shaft hole 404B and the rotation shaft 412C, and this shock force concentrates on the root portion of the rotation shaft 412C, which causes damage to the second shutter member 412.

Further, since the lower shell 404 (the plane portion thereof) is generally formed of a thin plate, the above impact force also causes damage to the shaft hole 404B (that is, the lower shell 404).

In view of the above facts, the first object of the present invention is to obtain a shutter for a disk cartridge which has a good slidability and a light weight, and in which the warp in the plate thickness direction is suppressed.

A second object of the present invention is to obtain a disk cartridge which can open and close the opening by driving the shutter member with an appropriate driving force.

Further, in consideration of the above facts, a third object of the present invention is to obtain a disk cartridge capable of preventing the abrasion due to the operation of the shutter member.

Further, in consideration of the above facts, a fourth object of the present invention is to obtain a disk cartridge which is easy to assemble and is low in cost.

Further, the present invention takes the above facts into consideration,
A fifth object of the present invention is to obtain a disk cartridge which can prevent damage to the rotary shaft of the shutter member and improve reliability.

[0057]

In order to achieve the above-mentioned first object, a shutter for a disk cartridge according to a first aspect of the invention is a case in which a disk-shaped disk medium is rotatably housed and the outside of the case. A thin plate which is disposed between the cover member and the cover member and which opens and closes an opening for access to the disk medium, which is provided in communication with the case and the cover member, while sliding with the case or the cover member. -Shaped disc cartridge shutter having a two-layer structure of a metal plate whose affinity to a resin is enhanced by an electrochemical surface treatment, and a resin layer formed by insert molding the metal plate into the resin , Is characterized.

In the disk cartridge shutter of the first aspect, the opening for accessing the disk medium is opened and closed while sliding on the case or the cover member between the case and the cover member of the disk cartridge. It goes without saying that the shutter for the disk cartridge may be configured to slide on both the case and the cover member.

Here, since the resin material and the metal plate to be insert-molded are enhanced in affinity for the resin by the electrochemical surface treatment, two layers in which the metal plate and the resin material are firmly bonded by a chemical reaction are formed. It becomes a structure. As the electrochemical surface treatment method for increasing the affinity with the resin, for example, the method described in Japanese Patent Publication No. 5-51671 can be used.

Therefore, the warp due to the residual stress of the resin layer is corrected by the metal plate without being separated from the metal plate (metal layer). That is, the warp of the disk cartridge shutter is suppressed or prevented.

As a result, the shutter for the disc cartridge can use the resin material, and the weight and the slidability can be improved. The thickness of the resin layer is 0.4.
The thickness is preferably from mm to 1.2 mm, and more preferably from 0.4 mm to 0.6 mm due to a demand for thinning the shutter for the disk cartridge.
On the other hand, the thickness of the metal layer (metal plate) is preferably 0.1 mm to 0.8 mm, and in particular, it is 0.1 m due to the demand for thinning the shutter for the disc cartridge.
More preferably, it is from m to 0.2 mm.

Further, since the metal plate and the resin material have high bonding strength, the bonding state with the resin layer is kept strong even if a flat metal plate is used without adopting a conventional buried structure. be able to. With this configuration, the resin layer has a uniform thickness and the residual stress is reduced, so that the warp of the disk cartridge shutter is further suppressed.

As described above, the shutter for the disk cartridge according to the first aspect has good slidability and is lightweight,
The warp in the plate thickness direction is suppressed.

A disc cartridge shutter according to a second aspect of the present invention is the disc cartridge shutter according to the first aspect, wherein the metal plate is made of stainless steel, and the joint surface with the resin layer is roughened. , Is characterized.

In the disk cartridge shutter of the second aspect, since the metal plate is made of stainless steel and has high rigidity, the warp can be corrected more effectively.

Further, since the metal plate has a roughened bonding surface with the resin layer, the bonding (bonding) strength with the resin layer is improved, which is more preferable. The surface roughness of the joint surface is R
It is desirable that a (center line average roughness) is 0.2 or more.

A disk cartridge shutter according to a third aspect of the present invention is the disk cartridge shutter according to the first or second aspect, wherein the surface of the resin layer is a sliding surface with respect to the case or the cover member. , Is characterized.

In the disk cartridge shutter of the third aspect, since the resin layer having a friction coefficient lower than that of the metal serves as the sliding surface with respect to the case or the cover member, the slidability is good.

A disk cartridge shutter according to a fourth aspect of the present invention is the disk cartridge shutter according to any one of the first to third aspects, wherein the resin material is polyacetal, polyphenylene sulfide, polybutylene terephthalate. , Polyamide, or polycarbonate.

In the disk cartridge shutter according to claim 4, the resin material is polyacetal (polyoxymethylene, POM), polyphenylene sulfide (PP).
S), polybutylene terephthalate (PBT), polyamide (PA), or polycarbonate (PC), in other words, since the resin layer is made of a low friction material,
Sliding property is improved.

A disk cartridge shutter according to a fifth aspect of the present invention is the disk cartridge shutter according to any one of the first to fourth aspects, wherein the resin material is mixed with a solid lubricant. It has a feature.

In the disk cartridge shutter of the fifth aspect, since the resin material is mixed with the solid lubricant (eg, molybdenum, molybdenum disulfide, graphite, etc.), the solid lubricant is deposited on the surface of the resin layer after insert molding. As a result, the slidability is further improved. For example, when molybdenum is used as the solid lubricant, it is desirable to mix it in an amount of 0.1% by mass or more.

A disc cartridge shutter according to a sixth aspect of the present invention is the disc cartridge shutter according to any one of the first to fifth aspects, wherein the surface of the metal plate is improved in slidability. It is characterized by that.

In the disk cartridge shutter according to the sixth aspect, a treatment for improving slidability on the surface of the metal plate (a surface opposite to the side where the resin material is bonded) (anti-rust treatment for preventing deterioration of slidability). Is included), the slidability is improved even in the configuration in which the surface of the metal plate is the sliding surface with the case or the cover member, and the degree of freedom in designing the disk cartridge is increased.

Further, the above structure is suitable when the disk cartridge shutter slides on both the case and the cover member.

The treatment for improving the slidability may be a treatment for dispersing (adding) self-lubricating fine particles such as molybdenum disulfide, graphite and fluorinated graphite in a matrix, and chrome or nickel. Etc. may be used.

In order to achieve the second object, claim 7
A disk cartridge according to the invention described in the above, a case for rotatably accommodating a disk-shaped disk medium, a first opening provided in the case for accessing a recording surface of the disk medium, and a central portion of the case. A second opening for accessing the central portion of the disk medium, a first shutter member capable of opening and closing the first opening, a second shutter member capable of opening and closing the second opening, A cover member having openings corresponding to the first opening and the second opening and accommodating the first shutter member and the second shutter member between the case and the case;
When the disc medium is used, the first shutter member rotates around the axis of the disc medium to open the first opening, and the second shutter member is pressed and moved with the rotation. In the disc cartridge that opens the second opening, the first shutter member has a pressing portion that presses the second shutter member,
It is characterized in that it is provided so as to project outward from the end portion of the first shutter member.

According to a seventh aspect of the present invention, there is provided a disk cartridge having a disc-shaped disk medium rotatably housed on one side or both sides of the case. Openings are provided, and the first shutter member and the second shutter member are closed at the closed position when the disk medium is not used. That is, the first opening is closed by the first shutter member, and the second opening is closed by the second shutter member, which prevents dust from entering the case.

On the other hand, when the disc medium is used, the first shutter member is rotated about the axis (rotation center) of the disc medium by, for example, being operated by the drive device, and the second shutter member is pressed by the second portion. Press the shutter member. As a result, the first shutter member rotates to open the first opening, and the second shutter member moves (including rotation) to open the second opening.

As described above, the disk medium can be accessed from the first opening and the second opening. For example, the rotating spindle shaft of the drive device enters from the second opening to rotate the disk medium while the first opening is being opened. Then, a recording / reproducing head or the like enters to record information on the recording surface of the disk medium or reproduce the information recorded on the recording surface.

Needless to say, the first opening and the second opening may be provided separately or may be provided in series with each other.

Here, since the pressing portion projects outward from the end portion of the first shutter member, in other words, the pressing portion has the width dimension of the first shutter member which is the same as in the conventional case, in the installation portion of the pressing portion. Since it is provided without corresponding widening, the first portion is properly separated from the rotation center of the first shutter member (rotation center of the disk medium).
The sliding area between the shutter member and one or both of the case and cover members is reduced.

Therefore, the first shutter member can move the second shutter member to the open position of the second opening by the pressing portion as the first shutter member rotates, and slide with the case or cover member. Resistance is suppressed and it operates smoothly.

As described above, in the disk cartridge according to the seventh aspect, the sliding resistance between the first shutter member and the case or the cover member is ensured while ensuring the movement amount of the second shutter member by the pressing of the first shutter member. Suppressed. That is, the shutter member (first shutter member and second shutter member) can be driven with an appropriate driving force to open and close the opening.

In order to achieve the second object, claim 8
In the disc cartridge according to the described invention, a flat plate shutter member moves and opens and closes at least a part of an opening provided in a case rotatably accommodating a disc-shaped disc medium to access the disc medium. In the disc cartridge, a lightening portion is provided in a portion of the shutter member other than a portion that closes the opening when the disc medium is not used.

In the disk cartridge according to the present invention, an opening for accessing the disk medium is provided on one or both sides of a case in which the disk-shaped disk medium is rotatably accommodated, and at least a part of this opening. Is opened and closed by moving a flat shutter member.

Needless to say, the shutter member may be configured to open and close the entire opening, or the remaining part of the opening may be opened and closed by another shutter member or the like.

Here, since the lightening portion is provided in the shutter member, the weight of the shutter member is reduced. This allows
The driving force for moving the shutter member in the opening / closing direction of the opening is reduced.

The lightening portion may be provided in a portion other than the portion that closes the opening when the disc medium is not used, and the lightening portion provided in this way passes through the opening in the process of opening and closing the opening. It goes without saying that it is also good.

As described above, in the disk cartridge according to the eighth aspect, the weight of the shutter member is reduced, and the shutter member can be driven by an appropriate driving force to open and close the opening.

A disc cartridge according to a ninth aspect of the present invention is the disc cartridge according to the eighth aspect, wherein the shutter member pivots about a pivot center located outside the opening to open and close the opening. The lightening portion is provided between the rotation center and a portion that closes the opening when the disc medium is not used.

In the disk cartridge according to the ninth aspect, the shutter member is rotated about the rotation center located outside the opening to open and close the opening for accessing the disk medium.

Here, since the lightening portion is provided between the rotation center of the shutter member and the portion that closes the opening when the disc medium is not used, the shutter member is lightened. In particular, in a long shutter member in which the center of rotation and the portion that closes the opening when the disk medium is not used are separated, it is preferable because the amount of lightening can be increased.

According to a tenth aspect of the present invention, in the disc cartridge according to the eighth or ninth aspect, the shutter member is provided between the case and a cover member having an opening corresponding to the opening. It is characterized in that it is arranged to slide with at least one of the case and the cover member to open and close the opening, and the lightening portion is provided on the sliding side surface of the shutter member.

In the disk cartridge of the tenth aspect, the shutter member moves (rotates) while sliding between one or both of the case and the cover member between the case and the cover member to open and close the opening.

Here, since the lightening portion is provided on the sliding side surface of the shutter member, the shutter member does not slide on the case or the cover member in the lightening portion. For this reason,
The sliding area between the shutter member and the case or the cover member is reduced, and sliding resistance is suppressed.

As described above, in the disk cartridge according to the tenth aspect of the invention, the weight of the shutter member is reduced and the sliding resistance is suppressed, and the opening can be opened and closed by driving the shutter member with an appropriate driving force.

A disc cartridge according to an eleventh aspect is the disc cartridge according to any one of the eighth to tenth aspects, wherein the lightening portion is a through hole penetrating the shutter member in a plate thickness direction. , Is characterized.

In the disk cartridge according to the present invention, the lightening portion in any one of claims 8 to 10 includes a recess provided in the flat plate surface, a notch portion provided in an end portion, and the like in addition to the through hole. Since the lightening portion is the through hole, the structure is simple and processing is easy, and the weight of the shutter member can be reduced while maintaining the rigidity thereof. In particular, in a configuration in which the shutter member slides (may slide) on both the case and the cover member in order to improve dustproofness, the sliding area is reduced on both sides of the shutter member, which is preferable.

In order to achieve the third object, claim 1
A disc cartridge according to a second aspect of the present invention includes an opening provided in a case that rotatably accommodates a disc-shaped disc medium, the opening being for accessing the disc medium.
A shutter member that rotates about a predetermined rotation center to open and close at least a part of the opening, and a cover member that has an opening corresponding to the opening and that accommodates the shutter member between the case and the case are provided. Further, in the disk cartridge, a sliding protrusion is provided at an end portion of the shutter member so as to project in a plate thickness direction toward at least one of the case side and the cover member side.

In a disk cartridge according to a twelfth aspect, an opening for accessing the disk medium is provided on one or both sides of a case in which a disk-shaped disk medium is rotatably accommodated, and at least a part of the opening. Is opened and closed by a shutter member that rotates around a predetermined rotation center between the case and the cover member.

It is needless to say that the shutter member may be configured to open and close the entire opening, and the remaining part of the opening may be opened and closed by another shutter member or the like.

Here, since the sliding projections projecting toward at least one of the case side and the cover member side are provided at the end portions of the shutter member, the shutter member has the case at the tip of the sliding projections. Alternatively, it slides with the cover member, and the end portion (edge portion) of the shutter member is prevented from sliding with the case or the cover member.

Therefore, for example, even when the shutter member is warped due to the curl of the material, the residual stress during molding, or the like, the end portion of the shutter member does not slide with the case or the cover member, but slides. Wear of the case or the cover member due to the above is prevented.

Further, not only the sliding due to wear is prevented and the sliding resistance between the shutter member and the case or the cover member is suppressed, but also the shutter member slides on the case or the cover member at the sliding protrusion. Therefore, the sliding area is reduced and the sliding resistance is further suppressed. As a result, the shutter member operates smoothly.

It is desirable that the sliding protrusion is projected on the surface on the side that is (or may be) concave due to the warpage of the shutter member.

As described above, in the disk cartridge according to the twelfth aspect, it is possible to prevent the case or the cover member from being worn due to sliding with the shutter member. That is, it is possible to prevent wear due to the operation of the shutter member.

In order to achieve the third object, a disk cartridge according to a thirteenth aspect of the present invention is provided in a central portion of a case that rotatably accommodates a disk-shaped disk medium, and accesses the disk medium. And a rotation shaft rotatably supported near the corner of the case on one end side, and the other end side is formed so as to close the opening, and the axis of the rotation shaft is formed. A disk cartridge comprising: a flat plate-shaped shutter member that rotates around to open and close the opening; and a cover member that has an opening corresponding to the opening and that houses the shutter member between the case and the case. The other end of the shutter member is provided with a curved-shaped sliding protrusion protruding in the plate thickness direction toward at least one of the case side and the cover member side. It is a symptom.

In the disc cartridge according to the thirteenth aspect, an opening for accessing the disc medium is provided in the center of the case, and the opening is arranged at a corner of the case between the case and the cover member. It is opened and closed by a shutter member that rotates around a rotation axis.

Here, a curved sliding protrusion protruding toward at least one of the case side and the cover member side is provided at the end portion (the other end portion) of the shutter member opposite to the rotating shaft. Therefore, the shutter member smoothly slides on the case or cover member at the curved tip of the sliding protrusion, and at the other end (edge) of the shutter member.
The sliding of the case or the cover member in the above is prevented.

Therefore, even in the case of a shutter member having a long length extending from a rotary shaft arranged at a corner of the case to an opening provided at the center of the case, the other end of the shutter member is likely to be warped easily. Does not slide on the case or cover member, and wear of the case or cover member due to sliding is prevented.

Further, since the curved sliding protrusion slides on the case or the cover member in a point contact state, the sliding area is further reduced and the above sliding resistance is further suppressed.

As described above, in the disk cartridge according to the thirteenth aspect, it is possible to prevent the case or the cover member from being worn due to sliding with the shutter member. That is, it is possible to prevent wear due to the operation of the shutter member.

According to a fourteenth aspect of the present invention, in the disc cartridge according to the thirteenth aspect, a plurality of corners are formed at the other end of the shutter member, and the sliding protrusion is provided at each corner. It is characterized by each being provided.

In the disk cartridge according to the fourteenth aspect, since the sliding protrusions are provided at the plurality of corners formed at the other end of the shutter member, the corners (edge portions) are formed.
Both are prevented from sliding with the case or the cover member.

Further, for example, it is possible to reliably prevent the occurrence of wear at the corners separated from the sliding protrusions due to the inclination of the shutter member, which is a concern when the sliding protrusions are provided at only one place.

A disk cartridge according to a fifteenth aspect of the present invention is the disk cartridge according to any one of the twelfth to fourteenth aspects, wherein the sliding protrusion is
It is characterized in that a pair of case-side protrusions protruding to the case side and cover-member-side protrusions protruding to the cover member side are configured.

In the disk cartridge according to the fifteenth aspect, since the case side projection and the cover member side projection form a pair of sliding projections, the shutter member slides in a point contact state with both the case and the cover member. The sliding resistance is further suppressed. Further, it is not necessary to identify the warp direction when processing the shutter member, and the workability is improved.

A disc cartridge according to a sixteenth aspect of the present invention is the disc cartridge according to any one of the twelfth to fifteenth aspects, wherein a plurality of the sliding protrusions are provided on the same side of the shutter member. In the above, the protruding height of each sliding protrusion is increased according to the distance from the center of rotation or the axis of the rotating shaft.

In the disc cartridge according to the sixteenth aspect, a plurality of sliding protrusions are provided on the same side of the shutter member, and the protrusion height of the sliding protrusions is the rotation center of the shutter member or the axis of the rotation shaft. Since it is increased according to the distance from (the larger the above distance, the larger the protrusion height of the sliding protrusion), it is the farthest from the center of rotation or the axis of the rotation shaft (the amount of warpage in the free state is The sliding protrusion (provided at the largest position) surely slides on the case or the cover member, and the wear is surely prevented.

Further, the warp of the shutter member is corrected by the contact between the sliding protrusion farthest from the center of rotation or the axis of the rotating shaft and the case or cover member, and the dustproof property is improved, and the center of rotation is improved. Alternatively, excessive slanting of the shutter member due to contact between the sliding protrusion near the axis of the rotating shaft and the case or cover member is prevented, and each sliding protrusion slides smoothly on the case or cover member.

Note that the sliding protrusions other than the sliding protrusions farthest from the center of rotation or the axis of the rotating shaft do not slide on the case or cover member depending on, for example, the warp or inclination of the shutter member. Needless to say, there are cases where it is okay.

A disk cartridge according to a seventeenth aspect of the present invention is the disk cartridge according to any one of the twelfth to sixteenth aspects, wherein the sliding protrusion is
The shutter member is provided at a position that does not pass through the opening as the shutter member rotates.

In the disk cartridge according to the seventeenth aspect, since the sliding protrusion is provided in a portion that does not pass through the opening of the shutter member, the sliding protrusion interferes with the edge of the opening as the shutter member rotates. Never. Therefore, the shutter member operates smoothly in the whole process of opening and closing the opening.

In order to achieve the third object, claim 1
A disk cartridge according to the invention described in 8 includes a first shutter member and a second shutter member that are provided in a case that rotatably accommodates a disk-shaped disk medium and that can open and close an opening for accessing the disk medium. In a disc cartridge in which the first shutter member moves while pressing the second shutter member to open the opening when the disc medium is used, at least the first shutter member and the second shutter member are provided. The material is different in the pressed area,
It is characterized by that.

In the disc cartridge according to the eighteenth aspect, an opening for accessing the disc medium is provided on one or both sides of a case in which the disc-shaped disc medium is rotatably accommodated, and when the disc medium is not used. The first shutter member and the second shutter member are respectively located at the closing position to close the opening, and dust and the like are prevented from entering the case.

In this disc cartridge, when the disc medium is used (for example, when the disc medium is loaded into the drive device or after the loading is completed), the first shutter member moves to the open position and the second shutter member moves to the first shutter member. The disk medium is pressed to move to the open position to open the opening, and the disk medium can be accessed through the opening. As a result, the disk medium is operated (for example, rotated by the rotary spindle shaft or irradiated with a laser beam by the laser head) from this opening to record or reproduce information.

Here, since the first shutter member and the second shutter member are made of different materials at least in the above-mentioned pressing portion, there is no occurrence of wear or noise due to the above-mentioned pressing operation.

As described above, in the disk cartridge according to the eighteenth aspect, it is possible to prevent the abrasion and the generation of the abnormal noise at the contact portion between the pair of shutter members. That is, it is possible to prevent wear due to the operation of the shutter member.

In order to achieve the third object, a disk cartridge according to the invention of claim 19 has a cylindrical wall formed in a substantially cylindrical shape, and a disk-shaped disk is provided inside the cylindrical wall. A case that rotatably accommodates the medium, an opening that is provided in the case to access the disk medium, a flat plate-shaped shutter body that can close a part of the opening, and one end of the shutter body. A first shutter member that is provided upright and has an arcuate guide portion that is curved along the cylindrical wall, and is formed in a flat plate shape that can close a part of the rest of the opening, and is interlockable with the shutter body. A second shutter member disposed in contact with the shutter member, wherein the arc-shaped guide portion moves along the cylindrical wall when the disc medium is used, In a disc cartridge in which the body is rotated and the second shutter member moves while being pressed by the shutter main body at the contact portion to open the opening, at least the shutter main body and the second shutter member are provided. It is characterized in that the contact portions are made of different materials.

In a disc cartridge according to a nineteenth aspect, an opening for accessing the disc medium is provided in a case in which the disc-shaped disc medium is rotatably accommodated inside the cylindrical wall. The first shutter member partially blocks the second shutter member, and the second shutter member partially blocks the remaining portion to prevent dust and the like from entering the case when the disk medium is not used.

In this disc cartridge, when the disc medium is used (for example, when the disc medium is loaded into the drive device or after the loading is completed), the arc-shaped guide portion of the first shutter member moves along the cylindrical wall to move the shutter body. Rotate. With the rotation of the shutter body of the first shutter member, the second shutter member that is pressed at the contact portion with the shutter body also moves (the second shutter member interlocks with the first shutter member).

When the first shutter member and the second shutter member are interlocked with each other to reach the open position, the opening is opened, and the disc medium can be accessed through this opening. As a result, the disk medium is operated (for example, rotated by the rotary spindle shaft or irradiated with a laser beam by the laser head) from this opening to record or reproduce information.

Here, since the first shutter member and the second shutter member are made of different materials at least at the above-mentioned pressing portion, wear and abnormal noise will not occur due to the above-mentioned pressing operation.

As described above, in the disk cartridge according to the nineteenth aspect, it is possible to prevent the abrasion and the abnormal noise from being generated at the contact portion between the pair of shutter members. That is, it is possible to prevent wear due to the operation of the shutter member.

A disc cartridge according to a twentieth aspect of the present invention is the disc cartridge according to the nineteenth aspect, wherein the shutter body of the first shutter member and the second shutter member have an opening corresponding to the opening. The shutter body is housed between a member and the case, the shutter body is made of a resin material, and the second shutter member is made of a metal material.

In the disk cartridge according to the twentieth aspect, since the shutter main body of the first shutter member is made of a resin material and the second shutter member is made of a metal material, wear and abrasion at mutual abutting portions are caused. No abnormal noise is generated. In particular, when the resin material forming the shutter body is a material having abrasion resistance and a low friction coefficient (for example, POM, PC, PE, etc.), the contact portion between the first shutter member and the second shutter member is Frictional resistance is reduced, and these operations (interlocking) are smooth, which is more preferable.

Further, since the arcuate guide portion also functions as a reinforcing rib of the shutter body, the flatness of the shutter body made of a resin material is secured. On the other hand, since the second shutter member is made of a metal material, deformation (for example, deformation due to temperature change during storage of the disk cartridge) and warp are alleviated, and flatness is secured. For this reason, the shutter body and the second shutter member of the first shutter member are favorably arranged between the case and the cover member to prevent contact with the outer surface of the case or the inner surface of the cover member, or to reduce contact resistance. It That is, the first
The operation of the shutter member and the second shutter member becomes smoother.

According to a twenty-first aspect of the present invention, there is provided a disc cartridge according to the nineteenth or twentieth aspect, wherein the first shutter member is
An operating portion that is operated when the disc medium is used and is given a linear moving force, and a thin plate-like member that connects the operating portion and the arc-shaped guide portion to convert the moving force into a circumferential moving force. The arc-shaped guide portion and the shutter body are integrally formed of a resin material, and the connection portion is made of an elastic material.

In the disk cartridge according to the twenty-first aspect, when the disk medium is used, the operation portion of the first shutter member is operated to give the linear moving force. This moving force is converted into a circumferential moving force by the connecting portion that connects the operating portion and the arc-shaped guide portion, and the arc-shaped guide portion moves along the cylindrical wall.

Here, since the arcuate guide portion of the first shutter member and the shutter body are integrally formed by resin molding, it is easy to process the first shutter member having a complicated shape.

Further, since the arcuate guide portion is made of a resin material, even if a slight distortion occurs, this distortion is absorbed by the elastic deformation, so that unnecessary friction with the cylindrical wall (for example, an arc end). Line contact or point contact with the cylindrical wall in the portion is prevented, and the first shutter member operates more smoothly.

Furthermore, since the connecting portion for converting the linear moving force into the circumferential moving force is made of an elastic material,
In other words, in the intermediate part, the arc shape along the cylindrical wall is deformed into a straight line in the tangential direction of the cylindrical wall, and the position of the intermediate part thus deformed continuously with the movement of the arcuate guide part. Since the connecting portion to be changed is made of an elastic material, the connecting portion is deformed and returned smoothly, and the operation of the first shutter member becomes even smoother.

In order to achieve the third object, a disc cartridge according to a twenty-second aspect of the present invention is an opening provided in a case rotatably accommodating a disc-shaped disc medium for accessing the disc medium. A first shutter member and a second shutter member that can be opened and closed.
In a disk cartridge in which a shutter member opens the opening while pressing the second shutter member, the pressing portion of the first shutter member and the pressed portion of the second shutter member have abrasion resistance and low wear resistance, respectively. It is characterized by being made of a resin material having a friction coefficient.

According to the twenty-second aspect of the present invention, there is provided an opening for accessing the disc medium on one or both sides of a case in which the disc-shaped disc medium is rotatably accommodated, and when the disc medium is not used. The first shutter member and the second shutter member are respectively located at the closing position to close the opening, and dust and the like are prevented from entering the case.

In this disc cartridge, when the disc medium is used (for example, when the disc medium is loaded into the drive device or after the loading is completed), the first shutter member moves along with the operation of moving to the open position. The pressing portion presses the pressed portion of the second shutter member, the second shutter member moves to the open position and opens the opening, and the disk medium can be accessed from this opening. As a result, the disk medium is operated (for example, rotated by the rotary spindle shaft or irradiated with a laser beam by the laser head) from this opening to record or reproduce information.

Since the pressing portion and the pressed portion are made of a resin material having abrasion resistance and a low friction coefficient, respectively,
1st without opening or closing when opening or closing the opening
Also, the second shutter member can be operated smoothly.

As described above, in the disk cartridge according to the twenty-second aspect, it is possible to prevent the abrasion and the abnormal noise from being generated at the contact portion between the pair of shutter members. That is, it is possible to prevent wear due to the operation of the shutter member.

In order to achieve the above object, a disk cartridge according to a twenty-third aspect of the present invention has a cylindrical wall formed in a substantially cylindrical shape, and a disk-shaped disk medium is provided inside the cylindrical wall. A case that is rotatably accommodated,
An opening provided in the case for accessing the disc medium, a flat plate-shaped shutter body capable of closing a part of the opening, and a stand extending from one end of the shutter body and extending along the cylindrical wall. First shutter member having a curved arc-shaped guide portion and a pressing portion provided on the shutter body, a flat plate shutter face plate capable of closing a part of the remainder of the opening, and provided on the shutter face plate Cover having a second shutter member having a pressed portion disposed in contact with the pressing portion and an opening corresponding to the opening, and accommodating the shutter body and the shutter face plate between the case and the case. When the disk medium is used, the arc-shaped guide portion moves along the cylindrical wall to rotate the shutter body. Serial to press the the pressing portion pressed portion in the disc cartridge first shutter member and second shutter member opens the opening in conjunction, with the shutter body and the shutter faceplate,
Each of them is made of a metal material, and each of the pressing portion and the pressed portion is made of a resin material having wear resistance and a low friction coefficient.

In the disk cartridge according to the twenty-third aspect, an opening for accessing the disk medium is provided in a case in which the disk-shaped disk medium is rotatably accommodated inside the cylindrical wall, and this opening is The shutter body of the first shutter member partially blocks the shutter body, and the shutter face plate of the second shutter member partially blocks the remaining portion to prevent dust and the like from entering the case when the disc medium is not used.

In this disc cartridge, when the disc medium is used (for example, when the disc medium is loaded into the drive device or after the loading is completed), the arc-shaped guide portion of the first shutter member moves along the cylindrical wall to move the shutter body. Rotate. With the rotation of the shutter body, the pressing portion of the shutter body presses the pressed portion of the shutter face plate, and the first shutter member and the second shutter member move together in the opening direction (rotation). Including).

As a result, the opening is opened, and the disc medium can be accessed through this opening.
The disk medium is operated from this opening (for example, rotation by a rotary spindle shaft or irradiation of laser light by a laser head) to record or reproduce information.

Since the pressing portion and the pressed portion are made of a resin material having abrasion resistance and a low friction coefficient, respectively,
1st without opening or closing when opening or closing the opening
Also, the second shutter member can be smoothly interlocked.

On the other hand, since the flat plate-shaped shutter body and the shutter face plate are respectively made of a metal material,
Good flatness. Therefore, the shutter body and the shutter face plate operate smoothly between the case and the cover member, respectively.

As described above, in the disk cartridge according to the twenty-third aspect, it is possible to prevent the abrasion and the abnormal noise from being generated at the contact portion between the pair of shutter members. That is, it is possible to prevent wear due to the operation of the shutter member.

According to a twenty-fourth aspect of the present invention, there is provided a disk cartridge according to the twenty-third aspect, in which the pressing portion is fixed to the shutter body, and the pressed portion is fixed to the shutter face plate. The means are each one of adhesion, screw fixing, ultrasonic fixing, and press fitting.

In the disk cartridge according to the twenty-fourth aspect of the present invention, the pressing portion and the shutter body, and the pressed portion and the shutter face plate are formed by a simple joining method such as bonding, screwing (screw tightening), ultrasonic fixing (welding) and press fitting. Since they are integrated, the structure of the first shutter member and the second shutter member becomes simple, and the cost can be reduced. Since the pressing direction of the pressing part of the shutter body and the pressed part of the shutter face plate is determined, it is not necessary to firmly integrate the pressing part and the shutter body, and the pressed part and the shutter face plate. A simple joining method can be used.

According to a twenty-fifth aspect of the present invention, in the disc cartridge according to any one of the twenty-second to twenty-fourth aspects, the resin material is
It is characterized by being any one of polyacetal, polycarbonate and polyethylene.

In the disk cartridge according to the twenty-fifth aspect, since the resin material forming the pressing portion and the pressed portion is any one of polyacetal (polyoxymethylene, POM), polycarbonate (PC) and polyethylene (PE), In other words, since the pressing part and the pressed part are made of a resin material having wear resistance and a low friction coefficient and excellent workability, respectively, the first and second parts of each of the above-mentioned configurations are formed.
It is suitable for use as a shutter member.

It goes without saying that the resin material forming the pressing portion and the resin material forming the pressed portion may be different.

In order to achieve the fourth object, claim 2
A disc cartridge according to a sixth aspect of the present invention has at least a part of an opening provided in a case that rotatably accommodates a disc-shaped disc medium for accessing the disc medium, and moves along a wall portion of the case. A disk cartridge opened and closed by a shutter member, comprising: an engagement portion provided on the shutter member and slidably engaged with the wall portion to prevent the shutter member from falling off the case. I am trying.

In a disc cartridge according to a twenty-sixth aspect, an opening for accessing the disc medium is provided on one or both sides of a case in which the disc-shaped disc medium is rotatably accommodated, and at least a part of the opening. Is opened and closed by moving the shutter member along the wall of the case.

Needless to say, the shutter member may be configured to open and close all of the openings, or the remaining part of the opening may be opened and closed by another shutter member or the like.

When assembling this disc cartridge, first, the shutter member is arranged outside the opening forming surface of the case (if there is another shutter member, these shutter members are arranged together), and the opening is closed. . Next, the disk medium is housed in the case.

Here, since the shutter member is provided with an engaging portion that engages with the wall portion of the case to prevent the shutter member from coming off from the case, the shutter member comes off from the case when the disk cartridge is assembled. Never.
Therefore, when assembling the disc cartridge, complicated and careful work is not required so that the shutter member does not fall off, the assembling workability is improved, and the assembling time is shortened.

Since the engaging portion is slidable on the wall portion, movement of the shutter member does not hinder opening and closing of the opening.

As described above, in the disk cartridge according to the twenty-sixth aspect, the assembling work is easy and the cost is low.

In order to achieve the fourth object, the disk cartridge according to the invention of claim 27 has a cylindrical wall formed in a substantially cylindrical shape, and the disk-shaped disk is inside the cylindrical wall. A lower shell that rotatably accommodates media, an upper shell that is joined to the lower shell and covers the upper side of the cylindrical wall, an opening that is provided in the lower shell, and that is used to access the disc media, and the lower shell. The shutter main body is provided below the shell and can close at least a part of the opening, and the arc-shaped guide portion is provided upright from one end of the shutter main body and curved along the cylindrical wall. A shutter member; and a cover member having an opening corresponding to the opening and accommodating the shutter body between the lower shell and at least one of the openings. When opening and closing the, in the disk cartridge in which the arcuate guide portion rotates the shutter main body while being guided along the outer surface of said cylindrical wall,
It is characterized in that it is provided with an engaging portion which is provided on the arcuate guide portion and slidably engages with the cylindrical wall to prevent the shutter member from falling off from the lower shell.

In the disc cartridge according to the twenty-seventh aspect, a disc-shaped disc medium is rotatably accommodated inside the cylindrical wall, and the upper shell (upper side) of the cylindrical wall is covered with the upper shell. An opening is provided for accessing the disc media. At least a part of this opening is opened and closed by a shutter member housed between the lower shell and the cover member. When opening and closing at least a part of the opening, the shutter member smoothly rotates the shutter body while the arc-shaped guide portion is guided along the outer surface of the cylindrical wall of the case.

It is needless to say that the shutter member may be configured to open and close the entire opening, and the remaining part of the opening may be opened and closed by another shutter member or the like.

In assembling this disc cartridge, first, a shutter member is arranged (set) on the lower side of the lower shell (the side opposite to the upper shell joining side). Specifically, the arcuate guide portion is arranged along the outer surface of the cylindrical wall of the lower shell, and the shutter body is arranged at the opening closing position below the lower shell. If there is another shutter member, it is placed together in the opening closing position to close the entire opening.

Next, the disk medium is housed inside the cylindrical wall of the lower shell. Further, the upper part of the cylindrical wall is covered with an upper shell to join the upper shell and the lower shell (for example,
When joining with screws etc., flip the upper and lower shells).

In this state, the cover member is attached to the lower shell to accommodate the shutter member, and the assembly of the disc cartridge is completed. If there are other parts (for example, a biasing means for biasing the shutter member, a locking means for restricting the movement of the shutter member, etc.), these are assembled before the cover member is attached.

Here, since the arcuate guide portion of the shutter member is provided with an engaging portion that engages with the cylindrical wall and prevents the shutter member from coming off, during assembly of the disc cartridge (before attachment of the cover member). The shutter member does not fall off the lower shell. For this reason, complicated and careful work is not required to prevent the shutter member from falling off, the assembling workability is improved, and the assembling time is shortened.

Since the engaging portion is slidable on the cylindrical wall, the opening / closing of the opening is not obstructed by the movement of the shutter member.

As described above, in the disk cartridge according to the twenty-seventh aspect, the assembling work is easy and the cost is low.

A disc cartridge according to a twenty-eighth aspect of the present invention is the disc cartridge according to the twenty-seventh aspect, wherein the engaging portion is provided at an upper end portion of the arcuate guide portion and is hung on an upper end portion of the cylindrical wall. It is characterized in that it is an engaging claw.

In the disc cartridge according to the twenty-eighth aspect, an engaging claw serving as an engaging portion is hooked on the upper end of the cylindrical wall to prevent the shutter member from falling off the lower shell.

Since this engaging pawl is simply hung on the upper end of the cylindrical wall, it is not necessary to provide a hole or a convex portion for engaging the engaging pawl on the cylindrical wall, and the structure is simple, and Assembly work becomes easier.

A disc cartridge according to a twenty-ninth aspect of the present invention is the disc cartridge according to the twenty-eighth aspect, wherein the inner edge of the upper end of the cylindrical wall is chamfered in a tapered shape, and the tip of the engaging claw is the chamfered portion. It is characterized by being formed correspondingly.

According to a twenty-ninth aspect of the invention, in the disk cartridge, the inner peripheral edge of the upper end of the cylindrical wall is chamfered in a tapered shape, and an engaging claw whose tip portion is formed corresponding to this chamfered portion is hooked on the upper end portion of the cylindrical wall. Therefore, the shutter member is securely held by the lower shell. That is, not only the vertical direction but also the shutter member is prevented from dropping from the lower shell along the direction orthogonal thereto.

Further, since the tip of the engaging claw corresponds to the tapered chamfer, the engaging claw does not project into the cylindrical wall, or the projecting is minimized. Therefore, the interference between the engaging claw and the disk medium housed inside the cylindrical wall can be prevented with appropriate dimensional accuracy (processing accuracy and assembly accuracy of each part).

A disc cartridge according to a thirtieth aspect of the present invention is the disc cartridge according to any one of the twenty-seventh to twenty-ninth aspects, wherein the arc-shaped guide portions are provided on both outer sides in the width direction of the shutter body. It is characterized in that the engaging portions are extended and are provided at least at two positions sandwiching the shutter body.

[0184] In the disk cartridge according to the thirtieth aspect, the arcuate guide portions are extended to both outer sides in the width direction of the shutter main body, and the engaging portions are provided at at least two positions sandwiching (straddling) the shutter main body in the extended portions. Alternatively, since the engaging claws are provided, in other words, the shutter body and the engaging portion are provided so as not to face each other but offset, so that the shutter member can be easily assembled to the lower shell.

Further, since the shutter member is engaged (engaged) with the cylindrical wall by at least two engaging portions (engaging claws), the shutter member is surely prevented from coming off from the lower shell.

In order to achieve the fourth object, claim 3
In the disk cartridge according to the invention described in Item 1, at least a part of an opening provided in a case rotatably accommodating a disk-shaped disk medium for accessing the disk medium is rotated about an axis of a rotation shaft. In the disc cartridge opened and closed by the shutter member, the rotation shaft is provided in either one of the case and the shutter member, and is rotatably inserted into a shaft hole provided in the other, and A locking member that prevents the shutter member from falling off the case is provided on the tip end side of the rotating shaft that penetrates the shaft hole.
It is characterized by that.

In the disc cartridge according to the thirty-first aspect, an opening for accessing the disc medium is provided on one or both sides of a case in which the disc-shaped disc medium is rotatably accommodated, and at least a part of the opening. Is opened and closed by a shutter member that is provided on one of the case and the shutter member and that is rotated around the axis of a rotating shaft that is rotatably inserted through a shaft hole that is provided on the other side.

It is needless to say that the shutter member may be configured to open and close the entire opening, and the remaining part of the opening may be opened and closed by another shutter member or the like.

When assembling this disc cartridge, first, the shutter member is arranged (set) outside the opening forming surface of the case. Specifically, the locking member is attached to the tip end side of the rotating shaft that is inserted through the shaft hole and penetrates the shaft hole (the side opposite to the case or shutter member side with the shaft hole sandwiched). The member is placed in the open closed position. If there is another shutter member, it is placed together in the opening closing position to close the entire opening. Then
Store the disc media in the case.

Here, since a locking member for preventing the shutter member from coming off the case is provided on the tip end side of the rotary shaft that penetrates the shaft hole, the shutter member is not attached when the disk cartridge is assembled. It does not fall out of the case. Therefore, when assembling the disc cartridge, complicated and careful work is not required so that the shutter member does not fall off, the assembling workability is improved, and the assembling time is shortened.

As described above, in the disk cartridge according to the thirty-first aspect, the assembling work is easy and the cost is low.

In order to achieve the above-mentioned fourth object, a disk cartridge according to a thirty-second aspect of the present invention accommodates a disk-shaped disk medium rotatably, and
A case having an opening for accessing the disc medium, a shaft hole provided in the case, and a rotary shaft rotatably inserted into the shaft hole at one end are provided. A shutter member that rotates about the axis of the shutter to open and close at least a part of the opening; a cover member that has the opening corresponding to the opening and that houses the shutter member between the case and the outer diameter; A sleeve member having a diameter larger than that of the shaft hole, and fitted to the tip end side of the rotating shaft penetrating the shaft hole to prevent the shutter member from falling off the case. I am trying.

In the disc cartridge according to the thirty-second aspect of the present invention, an opening for accessing the disc medium is provided on one or both sides of a case in which the disc-shaped disc medium is rotatably accommodated, and at least a part of the opening. Is a shutter member having a rotary shaft rotatably inserted in a shaft hole provided radially outside the disk medium of the case, and is rotated around the shaft center together with the rotary shaft between the case and the cover member. It moves and opens and closes.

It is needless to say that the shutter member may be configured to open and close the entire opening, and the remaining part of the opening may be opened and closed by another shutter member or the like.

When assembling this disc cartridge, first, the shutter member is arranged (set) outside the opening forming surface of the case. Specifically, the sleeve member is inserted into the shaft hole of the case while inserting the rotary shaft of the shutter member, and the sleeve member is fitted to the tip end side of the rotary shaft that penetrates the shaft hole (the side opposite to the shutter member side with the shaft hole interposed). Then, the shutter member is arranged at the opening closing position. If there is another shutter member, it is placed together in the opening closing position to close the entire opening.

Next, the disk medium is housed in the case. In this state, the cover member is attached to the case to accommodate the shutter member, and the assembly of the disc cartridge is completed. If there are other parts (for example, locking means for restricting the movement of the shutter member), these are assembled before the cover member is attached.

Here, since the outer diameter is larger than that of the shaft hole, and the sleeve member which is fitted to the tip end side of the rotating shaft penetrating the shaft hole to prevent the shutter member from falling off the case, The shutter member does not fall off from the case when the disc cartridge is assembled (before the cover member is attached). Therefore, when assembling the disc cartridge, complicated and careful work is not required so that the shutter member does not fall off, the assembling workability is improved, and the assembling time is shortened.

Since the sleeve member is simply fitted to the tip end side of the rotary shaft, the disc cartridge can be assembled more easily.

As described above, in the disk cartridge according to the thirty-second aspect, the assembling work is easy and the cost is low.

A disc cartridge according to a thirty-third aspect of the present invention is the disc cartridge according to the thirty-first or thirty-second aspect, wherein the shutter member is urged in the closing direction of the opening by the urging means, and the locking is performed. The member or the sleeve member is provided with a holding portion for holding one end of the biasing means.

In the disc cartridge according to the thirty-third aspect, the biasing means is provided, and the shutter member is biased in the closing direction of the opening. The biasing means is assembled immediately after the locking member or the sleeve member is connected or fitted to the tip end side of the rotating shaft (that is, before accommodating the disk medium), and the shutter is released even during the assembly process of the disk cartridge. It is desirable to bias the member in the closing direction of the opening.

Here, since the retaining member for retaining one end of the urging means is provided on the locking member (sleeve member) which is attached or fitted to the tip end side of the rotating shaft penetrating the shaft hole, the urging force is increased. Assembly of the means becomes easy. That is, the assembly of the disc cartridge becomes easier. The term “holding” includes all states such as locking, engagement, fitting, connection, fastening, and hooking in which the biasing force of the biasing means can be transmitted.

A disc cartridge according to a thirty-fourth aspect of the present invention is the disc cartridge according to the thirty-third aspect, wherein the biasing means has the locking member or the sleeve member or the rotating shaft inserted through an annular portion. The retaining portion is a torsion spring that protrudes from the outer surface of the locking member or the sleeve member in the radial direction of the rotating shaft, or the tip portion of the locking member or the sleeve member has the rotation portion. It is characterized in that it is a concave portion provided along the radial direction of the moving shaft.

In the disk cartridge according to the thirty-fourth aspect of the present invention, since the biasing means is the locking member or the sleeve member or the torsion spring which allows the rotary shaft to be inserted into the annular portion, the biasing means is provided within the limited space in the case. It is preferably housed.

Here, the holding portion for holding one end portion of the torsion spring is a convex portion protruding from the outer surface of the locking member (sleeve member) in the engagement direction of the rotating shaft, or the tip of the locking member (sleeve member). Since it is a concave portion provided along the engaging direction of the rotating shaft, it is only necessary to engage one end portion of the torsion spring with this convex portion or concave portion (fastening with a fastening means such as a holding bolt or a strong fitting). The shutter member can be biased without performing the adjustment. As a result, the assembly of the disc cartridge becomes even easier.

[0206] In order to achieve the fifth object, claim 3
In the disk cartridge according to the invention described in No. 5, at least a part of an opening provided in a case rotatably accommodating a disk-shaped disk medium for accessing the disk medium is rotated about an axis of a rotation shaft. In the disc cartridge opened / closed by the shutter member, the rotation shaft is provided in either one of the case and the shutter member, and is rotatably inserted into a shaft hole provided in the other, and the base is It is characterized by having a larger diameter than the tip side.

[0207] In the disk cartridge according to the thirty-fifth aspect, an opening for accessing the disk medium is provided on one or both sides of a case in which the disk-shaped disk medium is rotatably accommodated, and at least a part of this opening. Is opened and closed by a shutter member that is provided on one of the case and the shutter member and that is rotated around the axis of a rotating shaft that is rotatably inserted through a shaft hole that is provided on the other side.

Needless to say, the shutter member may be configured to open and close all of the openings, or the remaining part of the openings may be opened and closed by another shutter member or the like.

[0209] Here, since the root of the rotary shaft has a larger diameter than the tip side, the strength of the root is improved. For this reason,
For example, when the disc cartridge is dropped by mistake, the stress acting on the base of the rotary shaft is relieved, and the rotary shaft is prevented from being damaged.

As described above, in the disk cartridge of the thirty-fifth aspect, damage to the rotary shaft of the shutter member can be prevented and reliability is improved.

Further, in order to achieve the fifth object, a disk cartridge according to a thirty-sixth aspect of the present invention accommodates a disk-shaped disk medium rotatably, and
A case having an opening for accessing the disc medium, a shaft hole provided in the case, and a rotary shaft rotatably inserted into the shaft hole at one end are provided. And a shutter member that rotates about an axis of the shutter to open and close at least a part of the opening. In the disk cartridge, the rotation shaft has a root larger in diameter than the tip side. There is.

In the disc cartridge according to the thirty-sixth aspect, an opening for accessing the disc medium is provided on one or both sides of a case in which the disc-shaped disc medium is rotatably accommodated, and at least a part of the opening. Is opened and closed by a shutter member that is rotatably inserted in a shaft hole provided in the case and that rotates around an axis of a rotation shaft provided at one end of the shutter member.

It is needless to say that the shutter member may be configured to open and close the entire opening, and the remaining part of the opening may be opened and closed by another shutter member or the like.

Here, since the base of the rotary shaft has a larger diameter than the tip side, the strength of the portion fixed to the shutter member is improved. Therefore, for example, when the disc cartridge is dropped by mistake, the stress acting on the base of the rotary shaft is relieved and the rotary shaft (that is, the shutter member) is prevented from being damaged.

As described above, in the disk cartridge according to the thirty-sixth aspect, damage to the rotary shaft of the shutter member can be prevented and reliability is improved.

According to a thirty-seventh aspect of the present invention, in the disc cartridge according to the thirty-fifth or thirty-sixth aspect, at least a portion of the rotating shaft located in the shaft hole is a tapered surface, and the shaft is formed. The hole wall of the hole is a tapered wall facing the tapered surface.

According to a thirty-seventh aspect of the present invention, at least a portion of the rotating shaft located in the shaft hole is a tapered surface whose diameter is expanded toward the root side, and the hole wall of the shaft hole is rotated. Since the taper wall faces the taper surface of the moving shaft, for example, a part of the force acting in the radial direction (tilt direction) of the rotating shaft when the disc cartridge is dropped corresponds to the axial force depending on the taper angle. And the rotation shaft is reliably prevented from being damaged.

Further, similarly, the force acting on the shaft hole is also dispersed in the surface direction and the plate thickness direction of the case, so that the case is prevented from being damaged. Furthermore, since the rotating shaft is continuously expanded in diameter toward the root side by the tapered surface, the stress concentration coefficient is reduced, and the stress is further relieved.

[0219]

DESCRIPTION OF THE PREFERRED EMBODIMENTS (First Embodiment) A disk cartridge 10 to which a disk cartridge shutter according to a first embodiment of the present invention is applied will be described with reference to FIGS. 1 to 9. First, the overall configuration of the disc cartridge 10 will be described, and then the detailed configurations of the shutter main body 112 and the shutter face plate 151 as the shutter for the disc cartridge, which is a main part of the present invention, will be described.

In the drawings, arrow FR and arrow R
When E, arrow UP, arrow LO, arrow RI, and arrow LE are shown, the disk cartridge 10 is
Of the disk cartridge 10 when viewed from the direction of loading (insertion) into the drive device, the backward direction, the backward direction, the upward direction, the downward direction, the right direction, and the left direction. The directions of up, down, front, back, right, and left correspond to the above-mentioned arrow directions. Further, it goes without saying that each of these directions is shown for convenience and does not limit the direction in which the disc cartridge 10 is used. Therefore, for example, the disc cartridge 10 may be arranged horizontally or vertically when used. (Structure of Disc Cartridge) FIG. 1 (A) shows a perspective view of the disc cartridge 10 as seen from diagonally above, and FIG. 1 (B) shows the disc cartridge 10 as seen from diagonally below. The external appearance is shown in a perspective view.

As shown in these figures, the disc cartridge 10 is formed in a flat case shape as a whole, and a disc-shaped disc medium 20 as an information recording / reproducing medium described later is accommodated therein.

In the disc cartridge 10, the front end 10A is curved in an arc shape, and the rear end 10B has a polygonal shape in which the left and right corners are cut out according to the required function. The front-rear dimension of the disc cartridge 10 is slightly larger than the left-right dimension. As a result, the disc cartridge 10 has a configuration in which the loading direction in the drive device (not shown) can be easily recognized from the outside and the loading in the drive device from the wrong direction is not allowed.

A first guide groove 12A and a second guide groove 12B are provided on the left and right side surfaces of the disc cartridge 10, respectively, and are used for guiding when the drive device is loaded. A lock release lever 136 and a shutter engagement portion 122, which will be described later, project into the first guide groove 12A.

Further, an opening 14 is provided from the center of the lower surface of the disc cartridge 10 to the center of the front wall of the front end portion 10A in the left-right direction.
It is for access to the disk medium 20 when in use. That is, when using the disk medium 20,
A rotary spindle shaft of a drive device and a recording / reproducing head (for example, a laser head) are inserted into and approached from the opening 14. The opening 14 is closed by a first shutter member 110 and a second shutter member 150, which will be described later, housed in the disc cartridge 10 when the disc medium 20 is not used, and dust and the like enter the disc cartridge 10. Is prevented.

Furthermore, in the vicinity of the rear end portion 10B of the lower surface of the disc cartridge 10, two position regulating holes 16 are provided.
Is provided for the purpose of restricting (detecting) the position of the disk cartridge 10 in the drive device.

The disc cartridge 10 is loaded into the drive device from the front (in the direction of arrow FR) while being guided by the drive device in the first guide groove 12A and the second guide groove 12B, and the opening 14 is opened and the position is regulated. With the position detected and positioned in the drive device in the hole 16, the disk medium 20 is set in the drive device.
The recording of information on the disk and the reproduction of the information recorded on the disk medium 20 are performed.

Further, the detailed structure of the disc cartridge 10 will be described. As shown in the exploded perspective views of FIGS. 2 and 3, the disc cartridge 10 has a disc medium 20.

The disk medium 20 is formed in a disk shape having a center hole 22 in the center, and the recording surface formed on the lower surface 24 thereof is covered and protected by a cover layer (none of which is shown). Center hole 2 of this disk medium 20
An annular center core portion 26 is attached to 2 by adhesion or the like.

The center core portion 26 is adapted to be engaged and held or adsorbed and held by the tip portion of the rotary spindle shaft of the drive device. Also, the disk medium 20
May be configured without the center core portion 26,
In that case, the inner edge of the center hole 22 is engaged and held at the tip of the rotary spindle shaft.

The disk medium 20 is a case 30.
It is rotatably housed inside. The case 30 is formed by joining a base plate portion 32 as a lower shell and an upper surface plate portion 34 as an upper shell. Also, the case 30
A lower portion of the (base plate portion 32) is covered with a lower surface plate portion 36 as a cover member, and a first shutter member 110 and a second shutter member 150, which will be described later, are provided between the case 30 and the lower surface plate portion 36. It is a structure to accommodate.

The base plate portion 32 is provided with a base bottom portion 38 formed of a thin plate having a substantially rectangular shape with a front portion formed in a semicircular shape and a rear portion circumscribing the remaining semicircular portion.
A cylindrical wall 40 having the same diameter as the front semicircular portion and having the same diameter as that of the front semicircular portion is provided upright on the base bottom portion 38. The inner diameter of the cylindrical wall 40 is slightly larger than the outer diameter of the disk medium 20.

On the outer periphery of the rear portion of the base bottom portion 38, a substantially U-shaped peripheral wall 42 in plan view is formed so as to surround a substantially rear half portion of the cylindrical wall 40. Rear wall 4 of this peripheral wall 42
The reference numeral 4 corresponds to the rear end portion 10B of the disc cartridge 10 in the form of a fold line whose right and left corners are bent in plan view, and the height of the base bottom portion 38 from the upper surface 38A is lower than the cylindrical wall 40. The base bottom portion 38 also protrudes downward from the lower surface 38B (see FIG. 3).

The left wall 46 of the peripheral wall 42 has an outer surface formed along a tangent line parallel to the front-rear direction of the cylindrical wall 40 and a front end surface contacting the outer peripheral surface of the cylindrical wall 40 along the outer peripheral surface thereof.
A and the cylindrical wall 4 provided on the outer side (left side) of the left inner wall 46A.
0 and a left outer wall 46B extending slightly forward from the center portion in the front-rear direction. The left inner wall 46A is erected only on the upper surface 38A side of the base bottom 38 and has the same height as the rear wall 44. The left outer wall 46B is lower than the left inner wall 46A on the upper surface 38A side and on the lower surface 38B side. It is at the same level as the rear wall 44. A narrow groove 46C having an upper opening is formed between the left outer wall 46B, the left inner wall 46A and the cylindrical wall 40. On the other hand, the right wall 4 of the peripheral wall 42
8 also has the same structure as the left wall 46, but no narrow groove corresponding to the narrow groove 46C is formed on the right wall 48 side.

As a result, the peripheral wall 42 has the base bottom portion 38.
On the upper surface 38A side, the rear wall 44, the left inner wall 46A, and the right inner wall 48A form a substantially U-shaped plan view at the same height, and serve as a contact portion with a peripheral wall 88 (described later) of the upper surface plate portion 34, On the lower surface 38B side of the base bottom portion 38, the rear wall 44, the left outer wall 46B, and the right outer wall 48B form a substantially "U" shape in plan view at the same height and serve as a fitting portion with the lower surface plate portion 36. . Further, the outer surface (left side surface) of the left inner wall 46A serves as the lower bottom surface of the rear portion of the first guide groove 12A of the disc cartridge 10, and the upper end surface of the left outer wall 46B has the first guide groove 12A.
It becomes the lower side wall surface of the rear part and is the outer surface (right side surface) of the right inner wall 48A.
Is the lower bottom surface of the rear portion of the second guide groove 12B of the disk cartridge 10, and the upper end surface of the right outer wall 48B is the lower side wall surface of the rear portion of the second guide groove 12B.

Cylindrical projections 50 are provided upright on both corners of the rear end of the upper surface 38A of the base bottom 38 between the cylindrical wall 40 and the peripheral wall 42. This cylindrical protrusion 5
0 is at the same level as the rear wall 44 of the peripheral wall 42. Although illustration is omitted, a conical screw receiving portion corresponding to the through hole and the head of the fixing screw is formed inside the cylindrical protrusion 50.

In the vicinity of the cylindrical protrusion 50 on the left side,
A shutter shaft hole 52 as a shaft hole is provided, and is used for supporting a second shutter member 150, which will be described later. Further, a spring holding portion 53 is provided near the shutter shaft hole 52, and a torsion spring 158 described later is provided.
It is supposed to hold one end.

The base plate portion 32 is formed with an opening 54 which constitutes the opening 14 of the disc cartridge 10. The opening 54 is a circular hub hole 56 having a diameter larger than the outer diameter of the center core portion 26 of the disk medium 20.
And a substantially rectangular recording / reproducing head window portion 58 which is symmetrically extended to the outer peripheral front end portion along the radial direction of the semicircular portion of the base bottom portion 38 and in which the cylindrical wall 40 is also cut out. Has been done.

The width dimension of the recording / reproducing head window portion 58 in the left-right direction is the same as that of the hub hole 56 except for the vicinity of the connecting portion with the hub hole 56.
The width is widened to the left and right so as to be larger than the diameter, and by providing right and left widened portions 58A and 58B, it is possible to insert a large recording / reproducing head (close to the disk medium 20).

Further, a rib 60 is provided upright on the upper surface 38A side around the hub hole 56, so that the disk medium 20
It is for preventing contact between the lower surface 24 and the upper surface 38A of the base bottom portion 38.

Further, a shutter guide hole 62 is provided in the base bottom portion 38 near the hub hole 56. The shutter guide hole 62 has a shape in which the front corner portion of an arc-shaped hole surrounded by two arcs coaxial with the shutter shaft hole 52 and two straight lines passing near the axis of the shutter shaft hole 52 extends forward. It is said that.

On the other hand, as shown in FIG. 3, the base plate portion 3
A concave portion 38C is formed on the lower surface 38B of the second (base bottom portion 38) to actuate the shutter body 112 and the second shutter member 150 of the first shutter member 110, which will be described later, and to form the accommodation space. That is, on the lower surface 38B side of the base plate portion 32, the lower end surface of the peripheral wall 42 projects downward and the recess 38C is recessed upward with respect to the lower surface 38B of the base bottom portion 38.

As a result, the lower surface plate portion 36 is fitted to the peripheral wall 42 in a state of being in contact with the lower surface 38B.
In this configuration, a flat space is formed between 6 and the recess 38C. In addition, the cylindrical protrusion 5 on the lower surface 38B of the base bottom portion 38
At a position corresponding to 0, a cylindrical protrusion 63 coaxially communicated with the inside of the cylindrical protrusion 50 so that a screw and a tool can be inserted.
Is erected downward, and the outer periphery thereof is used for positioning the lower plate portion 36, and the inside thereof serves as the position regulating hole 16 of the disc cartridge 10 described above.

The cylindrical wall 40 of the base plate portion 32 described above
The disk medium 20 is housed inside. The center core portion 26 of the disk medium 20 has a hub hole 56.
It is placed on the rib 60 in a state of being inserted therein, and the contact with the upper surface 38A of the base bottom portion 38 and the cylindrical wall 40 is prevented. In this state, the upper surface of the base plate portion 32 is covered with the upper surface plate portion 34.

The upper plate portion 34 is used for the disc cartridge 1
A flat plate portion 64 corresponding to the outer shape of 0 in plan view is provided. That is, in the flat plate portion 64, the front end portion of a rectangular flat plate is curved in an arc shape, and the rear end portion is notched in the left and right corners to have a polygonal shape. Has been made larger.

An annular protrusion 66 corresponding to the rib 60 of the base plate portion 32 is provided at the central portion of the lower surface 64A of the flat plate portion 64.
Is provided, and the disc media 2 to the lower surface 64A is provided.
It is said to be for 0 contact prevention.

On the lower surface 64A of the flat plate portion 64, an annular groove 68 corresponding to the cylindrical wall 40 of the base plate portion 32 is formed. The annular groove 68 is formed so that the cylindrical wall 40 can be inserted as a whole, and the left outer wall 46 of the base plate portion 32 is formed.
The outer diameter of the front portion of B and the right outer wall 48B is slightly larger (wider), and together with the cylindrical wall 40, the arc-shaped guide wall portion 1 of the first shutter member 110 described later.
18 can be inserted.

Further, on the outer periphery of the front portion of the flat plate portion 64, an outer wall 70 which is formed in a substantially "U" shape in plan view so as to surround the front half portion of the annular groove 68 is provided upright downward. . The outer wall 70 has a height corresponding to the entire thickness of the disc cartridge 10, and is composed of a front wall 72, a left wall 74, and a right wall 76.

The front wall 72 is curved so as to correspond to the curved shape of the front end of the flat plate portion 64, and a rectangular window portion 78 is formed in the central portion in the left-right direction and has a notch opened downward. There is. The width dimension of the window portion 78 in the left-right direction is equal to that of the base plate portion 3.
2 corresponds to the width dimension of the recording / reproducing head window portion 58 and communicates with the opening 54 (recording / reproducing head window portion 58) of the base plate portion 32, and the opening 14 of the disk cartridge 10 is communicated.
It is designed to form part of. The front wall 72 constitutes the front end portion 10A of the disc cartridge 10.

The left wall 74 and the right wall 76 extend rearward from the left and right end portions of the front wall 72, and the positions corresponding to the front end portions of the left outer wall 46B and the right outer wall 48B of the base plate portion 32 are rear. It is supposed to be the end. That is, in the assembled state, lower portions of the rear end surfaces of the left wall 74 and the right wall 76 of the top plate portion 34 and the front end surfaces of the left outer wall 46B and the right outer wall 48B of the base plate portion 32 are in contact with each other.

Inside the outer wall 70, inner walls 80A and 80B are formed along the inner surfaces of the left and right corners, respectively. The lower end surfaces of the inner walls 80A and 80B are located slightly above the lower end surface of the outer wall 70 (recessed toward the inside of the disc cartridge 10), and the outer wall 7
It is a contact surface with the upper surface of the lower surface plate portion 36 fitted to zero.

Further, a lateral groove 74A is formed on the outer surface of the left wall 74 of the outer wall 70 along the front-rear direction thereof, and the bottom portion thereof reaches the inner wall 80A. The lateral groove 74A constitutes the front portion of the first guide groove 12A of the disc cartridge 10. In addition, the inner wall 80A is provided with a lock release lever hole 84 that connects the bottom of the lateral groove 74A and the inner side of the inner wall 80A. Further, on the lower surface 64A of the flat plate portion 64 near the lock release lever hole 84, the lock lever 13 described later is provided.
A support shaft 86A for biaxial support and a holding hole 86B for holding one end of the torsion spring 140 are provided.

On the other hand, the right wall 76 of the outer wall 70 is also constructed in the same manner as the left wall 74, and a lateral groove 76A which forms the front part of the second guide groove 12B and whose bottom reaches the inner wall 80B is formed. The lock release lever hole, the support shaft, and the holding hole are not provided on the right wall 76 (inner wall 80B) side.

Further, a peripheral wall 88 corresponding to the peripheral wall 42 of the base plate portion 32 is erected downward on the outer periphery of the flat plate portion 64 behind the outer wall 70. That is, the peripheral wall 8
8 is a rear wall 44, a left wall 46,
A rear wall 90 corresponding to the right wall 48, a left wall 92, and a right wall 94 are provided.

The rear wall 90 abuts on the rear wall 44 of the base plate portion 32 to form the rear end portion 10B of the disc cartridge 10.

The left wall 92 has a left inner wall 92A abutting the left inner wall 46A of the base plate portion 32 and a left outer wall 92B.
And the narrow groove 92C respectively correspond to the left outer wall 46 of the base plate portion 32.
B and the narrow groove 46C, the disk cartridge 10
The rear left side wall and the rear portion of the first guide groove 12A are configured. The narrow grooves 46C facing each other,
92C constitutes a shutter guide groove 96 into which a shutter pull-out portion 120 of a first shutter member 110 described later is inserted. This shutter guide groove 96
The (narrow groove 92C) communicates with the annular groove 68 near the front end of the left inner wall 92A. That is, the shutter guide groove 96 has the base plate portion 32 near the front end thereof.
The thin groove 46C and the portion near the outer wall of the annular groove 68 are formed to face each other.

Similarly to the left wall 92, the right inner wall 94A abuts the right inner wall 48A of the base plate portion 32, and the right outer wall 94B faces the right outer wall 48B of the base plate portion 32. 10 rear right side wall and second
The rear part of the guide groove 12B is configured.

Positioning protrusions 98 are provided between the peripheral wall 88 and the annular groove 68 at positions corresponding to the cylindrical protrusions 50 of the base plate portion 32. The positioning protrusions 98 are at the same height as the rear wall 90 of the peripheral wall 88, and the lower end surfaces of the positioning protrusions 98 are cylindrical protrusions 50 of the base plate portion 32.
It comes in contact with the upper end surface. A screw hole 98A is provided at the center of the positioning protrusion 98, and a screw whose head is engaged with a conical portion inside the cylindrical protrusion 50 of the base plate 32 is screwed into the screw hole 98A. Accordingly, the position regulating hole 16 (the cylindrical projection 6
The position of 3) is determined.

Further, by the above-mentioned screwing, the upper surface plate portion 34 is connected and held (bonded) to the base plate portion 32 in a state of covering the upper side (upper side) of the base plate portion 32, and the disc medium 2
This is a configuration in which a case 30 that rotatably accommodates 0 is formed. In this state, the cylindrical wall 40 of the base plate portion 32 is inserted into the annular groove 68 of the upper surface plate portion 34, and the peripheral wall 42 of the base plate portion 32 contacts the corresponding portion of the peripheral wall 88 of the upper surface plate portion 34. There is.

On the other hand, a lower surface plate portion 36 is arranged below the base plate portion 32. The lower surface plate portion 36 is formed in a flat plate shape whose outer shape is substantially the same as that of the flat plate portion 64 of the upper surface plate portion 34. 70 and the peripheral wall 42 (rear wall 44, left outer wall 46B, right outer wall 48B) of the base plate portion 32 can be fitted.

Further, the lower surface plate portion 36 includes the base plate portion 32.
An opening 100 having substantially the same shape as the opening 54 is formed at a position corresponding to the opening 54. That is, the opening 100 is composed of a hub hole 102 corresponding to the hub hole 56, a recording / reproducing head window portion 104 corresponding to the recording / reproducing head window portion 58, and right and left widened portions 104A and 104B.
The opening 100 communicates with the opening 54 to form the opening 14 of the disc cartridge 10.

Further, the lower surface plate portion 36 includes the base plate portion 3
A through hole 106 corresponding to the outer diameter of the second cylindrical protrusion 63 is provided at a position corresponding to the cylindrical protrusion 63.

The lower surface plate portion 36 has the cylindrical projection 63 of the base plate portion 32 inserted through the through hole 106, and the upper surfaces thereof include the lower surface 38B of the base plate portion 32 (a portion excluding the concave portion 38C) and the upper surface plate portion. The peripheral wall 42 (rear wall 44, left outer wall 46B, right outer wall 48B) of the base plate portion 32 and the upper surface plate portion 34 in a state of being in contact with the respective lower end surfaces of the inner walls 80A and 80B of 34.
Is fitted and held on the inner peripheral surface of the outer wall 70.

As described above, the lower side (lower side) of the case 30 accommodating the disk medium 20 is covered with the lower surface plate portion 36. Case 30 covered on this lower side
As described above, the disk cartridge 10 is provided with the front end portion 10A, the rear end portion 10B, the first guide groove 12A, the second guide groove 12B, the two position regulating holes 16, and the base plate portion 32. Opening 54 and the window 7 of the top plate 34
8 and the opening 100 of the lower plate portion 36 communicate with each other to form an opening 14 of the disk cartridge 10.

Further, the disc cartridge 10 has a shutter mechanism. The shutter mechanism is provided on the case 30 and closes or opens the opening 14. In addition, when each component of the shutter mechanism is described below using the front, rear, left, and right directions, it is basically based on the direction in the closed state of the opening 14.

This shutter mechanism is provided with a first shutter member 110, and the first shutter member 110 is provided with a shutter body 112 that mainly closes the recording / reproducing head window portion 58 of the base plate portion 32. Shutter body 1
12 is a substantially trapezoidal shape in plan view (a rectangular shape whose front and rear dimensions are substantially the same as the radius of the cylindrical wall 40 of the base plate portion 32 and whose width dimension is larger than the width dimension of the recording / reproducing head window portion 58, the front end portion is a cylinder It is formed of a thin flat plate having an arc shape corresponding to the wall 40 and having a shape in which a right rear corner is cut out. The thickness of the shutter main body 112 is determined by the base plate portion 3
2 from the lower surface 38B (upper surface of the lower surface plate portion 36) to the concave portion 38C.
Has been made smaller than the height.

The end surface (see FIGS. 2 to 4) of the hypotenuse portion which is the rear end of the shutter main body 112 serves as an abutting portion 114 for the second shutter member 150, which will be described later. Further, a pressing piece 116 as a pressing portion is erected upward at the left rear corner of the shutter body 112, and is used for pressing the second shutter member 150 described later. The shutter body 112 has a two-layer structure including a resin layer and a metal layer, and the detailed structure will be described later.

Further, the first shutter member 110 has an arcuate guide wall portion 118 as an arcuate guide portion. The arc-shaped guide wall portion 118 is formed such that the inner peripheral surface thereof is curved in an arc shape corresponding to the outer peripheral surface of the cylindrical wall 40 of the base plate portion 32 in a plan view, and stands upward from the front end portion of the shutter body 112. It is set up. Further, the arc-shaped guide wall portion 118 has the upper end of the cylindrical wall 4 at the upper end in the assembled state.
The height is determined so as to correspond to the upper end surface of 0 (see FIG. 8A). As a result, the arc-shaped guide wall portion 118
Is slidable along the outer peripheral surface of the cylindrical wall 40 of the base plate portion 32, and the recording / reproducing head window portion 58 of the base plate portion 32.
Can be closed (a portion of the front surface of the cylindrical wall 40 is cut out and communicates with the window portion 78 of the upper surface plate portion 34).

The arcuate guide wall portion 118 is provided with a short leftward projecting portion 118A of the shutter body 112 and a long rightward projecting portion 118B. The window portion 1 having an opening on the lower side is formed in the protruding portion 118B to the right.
18C is provided and corresponds to the window portion 78 of the upper surface plate portion 34. When the opening 14 is opened by the shutter mechanism, the size of each part is determined so that the window part 118C is located at the front part of the case 30 (rear of the window part 78).

On the other hand, a shutter pull-out portion 120 as a connecting portion is connected near the inner surface of the tip of the protruding portion 118A to the left of the arc-shaped guide wall portion 118. The shutter pull-out portion 120 is provided with the arc-shaped guide wall portion 11
The shutter engaging portion 122 as a small block-shaped operation portion is attached to the tip of the plate-shaped member which is sufficiently thinner than the plate 8.

As shown in FIG. 8B, the vertical width dimensions of the shutter pull-out portion 120 and the shutter engagement portion 122 correspond to the vertical dimension of the shutter guide groove 96 and the vertical dimension of the first guide groove 12A, respectively. is doing.

Further, a lock engaging portion capable of engaging with a lock claw 138 of the locking means 130, which will be described later, at a portion on the outer surface side of the connecting position of the left end of the protruding portion 118A of the arc-shaped guide wall portion 118 with the shutter pull-out portion 120. It is 118D.

The first shutter member 110 is shown in FIG.
As shown in (a bottom view with the lower surface plate portion 36 removed) and FIG. 8A, the arc-shaped guide wall portion 118 is formed on the base plate portion 3.
The shutter body 112 is inserted into the annular groove 68 of the upper surface plate portion 34 together with the second cylindrical wall 40 so as to be slidable along the outer peripheral portion of the cylindrical wall 40. It is arranged between the upper surface of the lower surface plate portion 36 and usually closes a part of the opening 14 (mainly the recording / reproducing head window portion 58).

In this state, the pressing piece 116 of the shutter main body 112 is inserted into the shutter guide hole 62 of the base plate portion 32 and is positioned in front of it. Further, in this state, as shown in FIG. 8B, the front end portion of the shutter pull-out portion 120 is located at the front end portion of the shutter guide groove 96 that communicates with the annular groove 68 of the upper surface plate portion 34, and the shutter engagement The joining portion 122 is located at a substantially central portion (in the rear of the left wall 74 of the top plate portion 34) in the first guide groove 12A and is exposed to the outside.

As a result, the shutter engaging portion 1 is externally connected.
By moving 22 to the rear, the shutter drawer 120
The arc-shaped guide wall portion 118 connected via the cylindrical wall 4
The outer peripheral surface of the shutter body 112 is slid along the outer peripheral surface of the shutter body 112, and the shutter body 112 is rotated about the axis of the cylindrical wall 40 (see FIGS. 4 to 7). That is, the shutter drawer 12
0 converts the linear moving force applied by moving the shutter engaging portion 122 rearward into the circumferential moving force (rotational force of the arc-shaped guide wall portion 118 along the cylindrical wall 40). It is like this.

Further, the shutter mechanism is provided with the lock means 130 for restricting the rotation of the first shutter member 110. The lock means 130 includes a lock lever 132 having a substantially V shape when seen in a plan view. Lock lever 1
Reference numeral 32 denotes a cylindrical shaft 134 provided in the central portion and rotatably supported by a support shaft 86A of the upper surface plate portion 34, and a lock release lever hole 84 provided at one end portion of the first guide groove 12A (lateral groove 74A). The lock release lever 136 is protruded to the front, and the lock claw 138 provided at the other end is engageable with the lock engagement portion 118D of the first shutter member 110.

Further, one end of the torsion spring 140 is locked to the lock lever 132, and the other end of the torsion spring 140 is inserted and held in the holding hole 86B of the top plate 34. As a result, the lock lever 132
Is urged by the torsion spring 140 in the direction in which the lock claw 138 engages with the lock engaging portion 118D of the first shutter member 110, and normally prevents the opening 14 from rotating in the opening direction (maintains the closed state). To do).

On the other hand, when the lock release lever 136 is pushed rearward, the lock lever 132 is rotated around the cylindrical shaft 134 against the biasing force of the torsion spring 140, and the lock pawl 138 and the first shutter member 110 are rotated. The engagement state with the lock engagement portion 118D is released.

Furthermore, the shutter mechanism has a second shutter member 150 as a shutter member,
The second shutter member 150 has a thin shutter face plate 151 that mainly opens and closes the hub hole 56 of the base plate portion 32.

The shutter face plate 151 is formed in a substantially trapezoidal shape in plan view (a long trapezoidal shape in which the parallel line segments in the front-rear direction located on the left and right are offset and the parallel line segments are long). It is equivalent to the shutter body 112 of the 1-shutter member 110. The shutter face plate 151 has an abutting portion 152 where the end face of the oblique side portion which is the front end thereof abuts the abutting portion 114 of the first shutter member 110.
It is said that.

Further, the shutter face plate 151 has the abutting portion 152 which is the oblique side portion and the right side portion (end portion in the front-rear direction).
A front right corner portion sandwiched between and is formed into an acute angle, and a part (right rear portion) of the recording / reproducing head window portion 58 is opened and closed together with the hub hole 56.

At the position corresponding to the pressing piece 116 of the shutter main body 112 in the abutting portion 152, the pressed piece 154 is erected upward. The pressed piece 154 has a width dimension capable of maintaining a state in which the pressed piece 116 is always slidably in contact with the pressed piece 116 within the rotation range of the shutter body 112 (the moving range of the pressed piece 116 regulated by the shutter guide hole 62). Has been done. This shutter face plate 1
Although 51 has a two-layer structure of a resin layer and a metal layer,
The detailed structure will be described later.

Further, the second shutter member 150 is provided with a rotary shaft 156 which is erected upward at the left rear end portion of the shutter face plate 151. The rotation shaft 156 corresponds to the shutter shaft hole 52 of the base plate portion 32, and the upper end portion of the rotation shaft 156 has a slot 156A as a spring engaging portion.

The second shutter member 150 has the shutter face plate 151 with the rotating shaft 156 inserted in the shutter shaft hole 52 of the base plate portion 32 and the pressed piece 154 inserted in the shutter guide hole 62. Are arranged between the recess 38C of the base plate portion 32 and the upper surface of the lower surface plate portion 36. In this state, the sliding 156 of the rotary shaft 156
One end of a torsion spring 158 as an urging means is locked to A, and the other end of the torsion spring 158 is locked to the spring holding part 53 of the base plate part 32 so that the second shutter member is engaged. 150 is always the first shutter member 1
It is urged in the abutting direction with 10 (the closing direction of the opening 14).

Thus, the second shutter member 150
The abutting portion 152 is normally in an abutting state with the abutting portion 114 of the first shutter member 110, and in this state, the hub hole 56 of the base plate portion 32 is mainly closed.

That is, the first shutter member 110 and the second shutter member 150 normally open the opening 14 of the disc cartridge 10 with their abutting portions 114 and 152 abutted, as shown in FIG. 1B. It is designed to be blocked.

In this state, the pressing piece 116 of the first shutter member 110 is engaged with the inner edge of the front portion of the shutter guide hole 62 of the base plate portion 32, and the abutting portion 11 is pressed.
It is designed to maintain a proper (no gap) butted state of 4,152. (Detailed Configuration of Shutter Body and Shutter Face Plate) The shutter body 112 of the first shutter member 110 and the second shutter member 150 described above.
The shutter face plate 151 has a two-layer structure of metal and resin as shown in the sectional view of FIG.

The shutter body 112 and the shutter face plate 151 are provided with a flat metal plate 160 made of stainless steel. The metal plate 160 has a thickness of about 0.1 mm. In the shutter body 112, the metal plate 160 has the arc-shaped guide wall portion 1.
It may be formed integrally with 18.

A resin layer 162 integrated by insert molding is provided on the lower surface of the metal plate 160. The resin layer 162 has a thickness of approximately 0.4 mm.

Metal plate 1 before insert molding
The lower surface of 60 has a surface roughness of Ra 0.2 or more. The lower surface of the metal plate 160 is
Electrochemical surface treatment is applied.

In this electrochemical surface treatment, the metal plate 160 is immersed in an electrodeposition solution (for example, a solution using an organic solvent such as an aqueous solution of triazine thiol as a solvent), and the metal plate 160 is used as an anode. In addition, a platinum plate, a titanium plate, a carbon plate, or the like is used as a cathode, and 0.1 mA / dm2 to 10 is applied between the anode and the cathode at 20 V or less.
This is done by applying an electric current of A / dm2 at 0 to 80 ° C. for 0.1 seconds to 10 minutes.

As a result, the processing layer 160A having a high affinity with the resin is formed on the lower surface of the metal plate 160.

The metal plate 1 which has been subjected to such a treatment
60 is insert-molded as described above, and the resin material that has been subjected to high temperature and high pressure in the mold is firmly bonded (joined) by a chemical reaction. As a result, the shutter body 112 and the shutter face plate 151 having a two-layer structure in which the resin layer 162 is bonded (integrated) to the lower surface of the metal plate 160 are configured.

This resin material is appropriately selected from POM, PPS, PBT, PA, and PC having good slidability according to the materials of the case 30 (base plate portion 32) and the bottom plate portion 36. To be done. Further, 0.1 mass% or more of powdery molybdenum as a solid lubricant is mixed in this resin material, and a part of this molybdenum is exposed (precipitated) on the surface of the resin layer 162 after insert molding. Has been done.
The upper limit of the amount of molybdenum mixed is preferably 10% by mass due to cost requirements.

Furthermore, on the upper surface of the metal plate 160,
Self-lubricating fine particles such as molybdenum disulfide are dispersed in the matrix.

The shutter body 112 and the shutter face plate 151 are normally rotated while sliding on the upper face of the lower face plate portion 36 when opening and closing the opening 14.

Next, the operation of the first embodiment will be described.

In the disc cartridge 10 having the above structure, the opening 14 has the first shutter member 110 and the second shutter member 15 when the disc medium 20 is not used.
Blocked by 0. That is, as shown in FIG. 4, the abutting portion 114 of the first shutter member 110 and the abutting portion 152 of the second shutter member 150 are abutted (abutted) to each other, and the first shutter member 11
0 mainly closes the recording / reproducing head window portion 58 of the base plate portion 32, and the second shutter member 150 mainly closes the hub hole 56 of the base plate portion 32.

At this time, the first shutter member 110 is
The lock claw 138 of the lock means 130 is engaged with the lock engaging portion 118D of the arcuate guide wall portion 118, whereby the rotation in the opening direction of the opening 14 is restricted, and the closed state is maintained. On the other hand, the second shutter member 150 is biased by the torsion spring 158 in the abutting direction with the first shutter member 110, and maintains the closed state.
This prevents dust from entering the disc cartridge 10 when the disc medium 20 is not used, that is, dust from adhering to the lower surface 24 of the disc medium 20.

The disc cartridge 10 is loaded into the drive device when the disc medium 20 is used (when recording information on the disc medium 20 or reproducing information recorded on the disc medium 20).
When loading the disc cartridge 10 into the drive device, the front end portion 10A of the disc cartridge 10 is inserted into the insertion opening 300 (see FIGS. 4 to 7) of the drive device.

With this insertion, the guide protrusions 302 and 304 of the drive device are inserted into the first guide groove 12A and the second guide groove 12B of the disc cartridge 10, respectively. The guide convex portion 302 inserted into the first guide groove 12A relatively moves rearward of the first guide groove 12A as the disc cartridge 10 is further inserted,
Lock release lever 13 located in the first guide groove 12A
6 is pressed and pushed backward.

When the lock release lever 136 is pushed rearward, as shown in FIG. 5, the lock lever 132 is rotated around the cylindrical shaft 134 (support shaft 86A), and the lock release lever 136 is opened. While being retracted inward, the engagement state between the lock claw 138 and the lock engagement portion 118D of the arc-shaped guide wall portion 118 is released. This allows
The locked state of the first shutter member 110 is released, and the first shutter member 110 is rotatable.

When the guide protrusion 302 of the drive device further moves rearward in the first guide groove 12A, the guide protrusion 302 is positioned in the first guide groove 12A while maintaining the unlocked state. It engages with the engaging portion 122 and presses it rearward. When the shutter engagement portion 122 is pushed rearward, the first shutter member 110 whose locked state is released rotates as shown in FIG.

That is, as the shutter engaging portion 122 moves rearward, the shutter pull-out portion 120 moves rearward in the shutter guide groove 96 extending in the tangential direction of the cylindrical wall 40, whereby the arc-shaped guide wall portion. 118 is the cylindrical wall 4
It rotates while sliding along the outer peripheral surface of 0. Along with the rotation of the arc-shaped guide wall portion 118, the shutter main body 112 integrated with the arc-shaped guide wall portion 118 rotates along the cylindrical wall 40 (around the axis of the cylindrical wall 40).

Further, with the rotation of the first shutter member 110, the pressing piece 116 of the shutter body 112 moves substantially rearward in the shutter guide hole 62 (provided apart from the axis of the cylindrical wall 40). The pressing piece 116 rotates about the axis of the cylindrical wall 40). When the pressing piece 116 moves substantially rearward, the pressed piece 154 of the second shutter member 150, which is disposed in contact with the pressing piece 116, is pressed substantially rearward while sliding with the pressing piece 116, and the shutter guide hole 62 has an arc shape. Move along the part. With the movement of the pressed piece 154, the second shutter member 150 resists the biasing force of the torsion spring 158 and rotates around the rotation shaft 156.
It rotates in the direction away from.

While the guide convex portion 302 of the drive device is engaged with the shutter engaging portion 122 (shutter engaging portion 122
(While pressing the rearward), when further moving rearward in the first guide groove 12A, as shown in FIG. 7, the first shutter member 110 (the shutter body 112 and the arc-shaped guide wall 118) and the second shutter The member 150 is further rotated, and the recording / reproducing head windows 58 and 104 and the hub holes 56 and 102 are opened. In this state, the window portion 118C of the arc-shaped guide wall portion 118 is located in the front portion of the disc cartridge 10, and the recording / reproducing head window portion 58 is also opened forward through the window portion 78 of the upper surface plate portion 34. That is, the opening 14 of the disc cartridge 10 is opened.

As described above, the first shutter member 110 and the second shutter member 150 abut against each other 11
By moving (pivoting) in different directions while separating 4 and 152, the large opening 14 of the disk cartridge 10 can be opened while reducing the shutter moving area.

When the disc cartridge 10 is inserted to a predetermined position of the drive device, the position regulating hole 16
The positioning mechanism of the drive device is inserted into the and the positioning is accurately performed. This prevents the disk cartridge 10 from being inserted any further, and also prevents the opening 14 from being closed by the urging force of the torsion spring 158 or the movement of the disk cartridge 10 in the ejecting direction (to the insertion opening 300 side).

In this state, the opening 1 whose closed state has been released
The rotary spindle shaft is inserted from the portion corresponding to the hub hole 56 of No. 4. The rotating spindle shaft holds the center core portion 26 of the disk medium 20 at the tip end by engaging or adsorbing the disk core 20, and rotates the disk medium 20 around its axis. Further, the recording / reproducing head window portion 58 of the opening 14 is formed.
A recording / reproducing head is inserted from the portion corresponding to (1) to record information on the recording surface of the disk medium 20 or reproduce the information recorded on the recording surface.

On the other hand, when the disc cartridge 10 is ejected from the drive device, the positioning mechanism is ejected from the position regulating hole 16 and is ejected in the ejection direction (insertion port 300).
It is possible to move to the side). In this state, the disc cartridge 10 is moved with the rear end portion 10B at the front by the urging force of the torsion spring 158 or the ejection force applied by the drive device. With this movement, while the guide convex portion 302 of the drive device is engaged with the shutter engaging portion 122, the pressing force via the guide convex portion 302 ceases to act, and the first shutter member 11
0 is in a rotatable state.

In this state, the disc cartridge 10
Closes the opening 14 while moving in the discharge direction as described above. That is, the second shutter member 150 is rotated in the closing direction of the opening 14 while the pressed piece 154 presses the pressing piece 116 of the first shutter member 110 substantially forward by the biasing force of the torsion spring 158. Further, the first shutter member 110, which is pressed substantially forward by the pressing piece 116, rotates in the closing direction of the opening 14 by this pressing.

When the first shutter member 110 and the second shutter member 150 respectively rotate and return to the initial position, the opening 14 is closed. The pressing piece 116 of the first shutter member 110 that has returned to the initial position is engaged with the inner edge of the front portion of the shutter guide hole 62, and the second shutter member 150 of the first shutter member 110 and the pressed piece 154 contacts the pressing piece 116. Further rotation due to the biasing force of the torsion spring 158 is prevented.

It should be noted that the first shutter member 110 and the second shutter member 110
The rotation of the shutter member 150 beyond the initial position causes the second movement.
It may be prevented by engaging the pressed piece 154 of the shutter member 150 with the peripheral edge portion of the shutter guide hole 62 at the initial position, and the tip end portion of the protruding portion 118B of the arc-shaped guide wall portion 118 of the first shutter member 110 may be prevented. It may be prevented by engaging the end of the wide portion of the annular groove 68 at the initial position. Further, the first shutter member 110 may return to the initial position when the shutter engagement portion 122 is pressed by the drive device.

The disc cartridge 10 is further moved in the ejecting direction, and the guide protrusion 302 is moved to the first guide groove 12A.
When it is moved forward from the lock release lever hole 84 of
The lock lever 1 is driven by the biasing force of the torsion spring 140.
32 rotates, the lock release lever 136 projects into the first guide groove 12A, and the lock claw 138 engages with the lock engagement portion 118D of the first shutter member 110. As a result, the disc cartridge 10 returns to the state before being loaded in the drive device, and the first shutter member 110
Is prevented from rotating and the closed state of the opening 14 is maintained.

Here, in the shutter body 112 and the shutter face plate 151, since the affinity of the metal plate 160 with the resin is enhanced by the electrochemical surface treatment, the metal plate 160 and the resin layer 162 (resin material).
And are strongly bonded by a chemical reaction.

Therefore, the resin layer 162 is not separated from the metal plate 160, and the warp due to the residual stress is corrected by the metal plate 160. That is,
The warp of the shutter body 112 is suppressed or prevented.

As a result, the shutter body 112 and the shutter face plate 151 are made lighter (the turning moment is reduced) by using the resin material, and the lower face plate portion 36.
The slidability with respect to is improved.

Also, the metal plate 160 and the resin layer 162
Since the bonding (bonding) strength with the is high, it is possible to firmly maintain the bonded state between the flat metal plate 160 and the resin layer 162 without adopting a buried structure for insert molding as in the past. Therefore, the resin layer 162 has a uniform thickness, and residual stress is reduced.
The warp of 12 is further suppressed.

As described above, in the shutter body 112 and the shutter face plate 151 according to the first embodiment, the occurrence of warpage can be suppressed, the slidability is good, and the weight is light.

Since the metal plate 160 is made of stainless steel and has a high rigidity, the above warpage can be corrected more effectively. Further, since the lower surface (bonding surface with the resin material) of the metal plate 160 is rough, the bonding (bonding) strength with the resin layer 162 is improved, which is more preferable. In particular, since the lower surface (bonding surface with the resin layer) of the metal plate 160 is a rough surface of Ra 0.2 or more, the effect of the electrochemical surface treatment is enhanced, and the bonding strength is further improved.

Further, the resin layer 162 forming the sliding surface with the lower plate portion 36 has high rigidity and good fatigue resistance, and is a low friction material such as POM, PPS, PBT, P.
Since it is either A or PC, slidability is improved, and the first shutter member 110 and the second shutter member 150 operate smoothly. In particular, molybdenum mixed with the resin material forming the resin layer 162 is deposited on the sliding surface, so that the slidability is further improved.

On the other hand, since the self-lubricating fine particles are dispersed in the matrix also on the upper surface of the metal plate 160 (the surface opposite to the resin layer 162), the slidability of the upper surface of the metal plate 160 is also improved. Therefore, for example, when the disc cartridge 10 is used with the lower surface plate portion 36 arranged along the vertical plane (that is, the shutter body 112).
Even when the sliding surface such as is not limited to the upper surface of the lower surface plate portion 36), the first shutter member 110 and the second shutter member 150 operate smoothly.

Also, in the case where the shutter body 112 and the shutter face plate 151 also slide with the recess 38C of the base plate portion 32 in order to further improve the dustproof property, the first shutter member 110 and the second shutter member 150 are also provided.
Works smoothly. That is, the degree of freedom in designing the disc cartridge 10 and the drive device is increased.

In the first embodiment, the metal plate 160 has a thickness of about 0.1 mm and the resin layer 162 has a thickness of about 0.4 mm. It is needless to say that the thicknesses of the metal plate 160 and the resin layer 162 can be appropriately changed depending on the area of the opening 14, for example. However, for example, the thickness of the shutter body 112 that opens and closes the opening 14 having an area corresponding to the disk medium 20 having a diameter of approximately 120 mm, and the metal plate 160 that constitutes the shutter face plate 151 have a wall thickness of 0 due to the rigidity required to prevent warpage. .1m
It is desirable to minimize m. In addition, the resin layer 16
The wall thickness of 2 is 0.4 considering the capacity (cost) of the molding machine.
It is desirable to minimize mm.

In the first embodiment, the surface roughness of the lower surface of the metal plate 160 is set to Ra 0.2 or more, but the present invention is not limited to this, and the surface of the lower surface of the metal plate 160 is not limited to this. The roughness may be less than Ra 0.2.

Furthermore, in the above-described first embodiment, the resin layer 162 is provided on the lower surface plate portion 36 side, but the present invention is not limited to this, and the resin layer 162 is formed on the base plate portion 32. It may be provided on the side. In this configuration, for example, a retaining member is provided at the tip of the rotating shaft 156 of the second shutter member 150 so that the shutter face plate 151 has the recess 38.
It is suitable for the case where it is configured to slide with C.

Furthermore, in the first embodiment,
The resin material forming the resin layer 162 is POM or the like, but the present invention is not limited to this. For example, the resin material may be ABS or PE.

In the first embodiment described above, the resin material forming the resin layer 162 has a preferable structure in which 0.1 mass% or more of powdery molybdenum as a solid lubricant is mixed. The invention is not limited to this. For example, instead of molybdenum, graphite, molybdenum disulfide, sulfides such as lead, zinc, or tungsten may be mixed, and the mixing ratio may be appropriately changed. Also, it goes without saying that the solid lubricant may not be mixed.

Furthermore, in the first embodiment described above, the preferable structure is that the self-lubricating fine particles are dispersed on the upper surface of the metal plate 160, but the present invention is not limited to this.
For example, the upper surface of the metal plate 160 may be subjected to chrome plating or nickel plating, and the treatment for improving slidability may not be performed. Also, the metal plate 160
Is not limited to the configuration made of stainless steel, and for example,
The metal plate 160 may be made of aluminum or iron. In addition, when the metal plate is made of a corrosive metal material such as iron, it is desirable to perform rust prevention treatment.

Furthermore, in the first embodiment described above,
Although both the shutter body 112 of the first shutter member 110 and the shutter face plate 151 of the second shutter member 150 have a preferable structure having a two-layer structure as the shutter for the disc cartridge according to the present invention, the present invention is not limited to this. Instead, for example, only one of them may have a two-layer structure of a metal layer and a resin layer. Also,
It goes without saying that this two-layer structure may be applied to the arc-shaped guide wall portion 118 of the first shutter member 110.
Furthermore, the shape of the shutter body 112 and the range for opening and closing the opening 14 are not limited to those in the first embodiment.
For example, a configuration may be adopted in which a rectangular shutter in plan view opens and closes the opening 14 while sliding in the left-right direction on the outer surface or the like of the case 30. (Second Embodiment) Next, a disk cartridge 170 according to a second embodiment of the present invention will be described.
The parts and portions that are basically the same as those in the first embodiment are given the same reference numerals as those in the first embodiment, and the description thereof is omitted.

As shown in FIGS. 10 and 11, the disc cartridge 170 has a first shutter member 172 instead of the first shutter member 110. The first shutter member 172 is common to the first shutter member 110 according to the above-described first embodiment in that the first shutter member 172 includes an arc-shaped guide wall portion 118, a shutter drawer portion 120, and a shutter engagement portion 122.

On the other hand, the first shutter member 172 according to the first embodiment is that the first shutter member 172 includes a shutter body 174 and a pressing piece 176 instead of the shutter body 112 and the pressing piece 116, respectively. Different from The shutter body 174 and the shutter face plate 151 in the second embodiment are not limited in material, and may be made of, for example, a resin material, a metal material, a combination thereof (including the above two-layer structure), or the like.

Hereinafter, the shutter body 174 and the pressing piece 176 forming the first shutter member 172 will be described. When referring to the front, rear, left, and right directions of the first shutter member 172 in the following description, basically, the front, rear, left, and right directions of the first shutter member 172 in the closed state of the opening 14 are indicated.

The shutter main body 174 forming the first shutter member 172 is formed in a substantially trapezoidal shape in plan view which is substantially the same as the shutter main body 112, and the width dimension in the left-right direction is the opening 14 (for the recording / reproducing head). By making it slightly larger than the width dimension of the window portion 58), the portion of the opening 14 corresponding to the recording / reproducing head window portion 58 can be mainly closed.

This width dimension is smaller than the corresponding width dimension of the shutter body 112, and the shutter body 174 is smaller than the shutter body 112 by the area of the region A shown by hatching in FIG. Further, the shutter main body 174 includes an abutting portion 114 that is exactly the same as the shutter main body 112 (both in length and angle).

In the shutter main body 174, the arcuate guide wall portion 118 is guided along the cylindrical wall 40, and a predetermined amount (the same amount as the shutter main body 112 as described above, for example, 50 Rotation by (°) causes the abutting portion 114 to move to a position along the left end portion (front-back direction) of the opening 14 to open the recording / reproducing head window portion 58 (see the figure). 14).

The shutter body 174, together with the shutter face plate 151, moves along with the above-mentioned rotation, and the base plate portion 3
The second concave portion 38C (case 30) and the upper surface of the lower surface plate portion 36 are respectively slidable.

On the other hand, the pressing piece 176 is the shutter body 1
A left end portion of a portion extending from the left rear corner portion of 74 to the left (outward in the left-right width direction of the shutter body 174) along the abutting portion 114 is formed by being bent upward.
That is, the pressing piece 176 protrudes leftward from the left end portion of the shutter body 174, and is the center of rotation of the cylindrical wall 4.
It is provided apart from the axis center of 0.

Regarding the distance between the pressing piece 176 and the axis of the cylindrical wall 40, the shutter main body 174 pivots around the axis of the cylindrical wall 40 together with the pressing piece 176 to open the recording / reproducing head window 58. In this state, the second shutter member 1 is pressed by the pressed piece 154 while contacting the pressing piece 176.
It is determined so that 50 can be rotated around the rotation shaft 156 to the open position of the hub hole 56 (see FIG. 14). That is, the position (separation distance) of the pressing piece 176 with respect to the axis of the cylindrical wall 40 is exactly the same as the position of the pressing piece 116 with respect to the axis of the cylindrical wall 40.

The pressing piece 176 is inserted and arranged in the shutter guide hole 62 like the pressing piece 116, and is constructed so as not to slide on the base plate portion 32 (case 30).

Next, the operation of the disk cartridge 170 according to the second embodiment will be described, focusing on the differences from the first embodiment.

In the disc cartridge 170 having the above structure, as shown in FIGS. 12 to 14, the first shutter member 172 and the second shutter member 150 operate in the same manner as the disc cartridge 10 to open and close the opening 14.

That is, when the disc medium 20 is not used, as shown in FIG. 12, the first shutter member 172 locked by the locking means 130 at the closed position of the opening 14 and the opening 14 by the torsion spring 158.
The opening 14 is closed by the second shutter member 150 that is biased in the closing direction.

On the other hand, when the disc medium 20 is used, as shown in FIG.
70 is inserted into the insertion opening 300 of the drive device, and this insertion operation moves the shutter engagement portion 122 rearward. Then, while the first shutter member 172 rotates about the axis of the cylindrical wall 40, the second shutter member 1 is pressed by the pressed piece 154 that abuts (slides) on the pressing piece 176.
50 is pushed around the rotating shaft 156 in the opening 14 opening direction. As a result, the opening 14 is opened (see FIG. 14).

Further, when closing the opening 14, the second shutter member 150 pushes the first shutter member 172 by the urging force of the torsion spring 158, while the second shutter member 150 and the first shutter member 172 are being pushed.
Respectively rotate in the closing direction of the opening 14 to return to the initial state. The opening 1 is opened by the biasing force of the torsion spring 158.
In addition to the second shutter member 182 that rotates in the closing direction of No. 4, the first shutter member 172 includes the shutter engaging portion 1
The initial state may be restored by pressing 22 forward.

Here, the pressing piece 176 is the shutter body 1
The width dimension of the shutter main body 174 corresponds to the width dimension of the opening 14 (recording / reproducing head window portion 58) in the left-right direction while being projected outward in the width direction of 74 (the first shutter member 172) (leftward). Therefore, in other words, since the shutter body 174 is not widened to include the installation portion of the pressing piece 176, the pressing piece 176 is properly separated from the axis of the cylindrical wall 40 (the rotation center of the shutter body 174). Case 30 of the shutter body 174 (recessed portion 38C)
Also, the sliding area with the upper surface of the lower plate portion 36 is reduced.

That is, as shown in FIG. 15, as compared with the conventional first shutter member, the area corresponding to the area A has the first area.
The sliding area of the shutter member 172 with the case 30 and the lower surface plate portion 36 is reduced.

Therefore, the shutter main body 174 (first shutter
The shutter member 172) can move to the open position of the hub hole 56 by pressing the second shutter member 150 (pressed piece 154) with its rotation (a predetermined pressing stroke can be secured), and the case 30 and The sliding resistance with the lower surface plate portion 36 is suppressed and the operation is smooth. In particular, since the area A is a portion that constantly slides (does not pass through the opening 14) with the case 30 and the lower surface plate portion 36 when the opening 14 is opened and closed, the effect of suppressing sliding resistance is great.

As described above, in the disk cartridge 170 according to the second embodiment, the shutter body 174
The sliding resistance between the shutter main body 174, the case 30, and the lower surface plate portion 36 is suppressed while securing the movement amount of the second shutter member 150 by the pressing. Further, the first shutter member 172 is reduced in weight by the amount corresponding to the area of the region A as described above.

As a result, the disk cartridge 17
0, the shutter mechanism (especially the first shutter member 17
2) operates smoothly with an appropriate driving force to open and close the opening 14. Therefore, when closing the opening 14, the first shutter member 17 is pressed by the biasing force of the torsion spring 158.
With the configuration that also drives 2, the torsion spring 158 can be downsized.

In the second embodiment, the shutter main body 174 has a preferable structure in which it slides on both the case 30 (recess 38C) and the upper surface of the lower surface plate portion 36, but the present invention is not limited to this. , For example, the shutter body 17
4 and the shutter face plate 151 form the case 30 (the recess 38
It may be configured such that it slides on one of C) and the upper surface of the lower surface plate portion 36.

In the second embodiment, the pressing piece 176 is formed by bending the extended portion of the shutter body 174, but the present invention is not limited to this.
For example, the pressing piece 176 as a separate member may be connected to the shutter body 174. This configuration is suitable when the shutter body 174 and the pressing piece 176 are made of different materials.

Furthermore, in the second embodiment described above, the pressing piece 176 is preferably provided along the abutting portion 114, but the present invention is not limited to this.
The pressing piece 176 may be provided so as to project rearward in a plan view, and the pressed piece 154 may be provided at a position recessed from the abutting portion 152. This configuration, for example,
The pressed piece 154 as a separate member is attached to the second shutter member 1
It is suitable for fitting and fixing in the fitting hole provided in 50.

Furthermore, in the above second embodiment,
Although the lower end of the pressing piece 176 is provided along the lower surface of the shutter body 174 (sliding surface with the lower surface plate portion 36), the present invention is not limited to this, and the lower end of the pressing piece 176 is The shutter body 174 may be positioned above the lower surface (having a step). In this configuration, the pressing piece 176 does not slide with the lower surface plate portion 36, so that the sliding resistance is further suppressed.

In the second embodiment, the pressing piece 176 is the base bottom portion 3 of the base plate portion 32 (case 30).
Although it is configured to be arranged in the shutter guide hole 62 penetrating through 8, the present invention is not limited to this. For example, the pressing piece 176 corresponds to the shape of the shutter guide hole 62 in the base plate portion 32. It may be arranged in the concave portion formed by. Alternatively, the pressing piece 176 may move in a recess formed in the lower surface plate portion 36 corresponding to the shape of the shutter guide hole 62, and may not slide with the lower surface plate portion 36. (Third Embodiment) Next, a disk cartridge 180 according to a third embodiment of the present invention will be described.
The parts and portions that are basically the same as those in the first embodiment are given the same reference numerals as those in the first embodiment, and the description thereof is omitted.

As shown in FIGS. 16 and 17, the disc cartridge 180 has a second shutter member 182 instead of the second shutter member 150. The second shutter member 182 includes the shutter face plate 151 (abutting portion 152), the pressed piece 154, and the rotating shaft 156 (sliding 156A) in that the second shutter member 182 is the second shutter according to the first embodiment. It is common with the member 150.

On the other hand, the second shutter member 182 is the second shutter member 15 according to the first embodiment in that the shutter face plate 151 is provided with the through hole portion 184.
Different from 0. The shutter face plate 151 and the shutter body 112 in the third embodiment are not limited in material, and may be made of, for example, a resin material, a metal material, a combination thereof (including the above two-layer structure), or the like.

The through hole portion 184 of the shutter face plate 151 constituting the second shutter member 182 will be described below.

As described above, the shutter face plate 151 of the second shutter member 150 is provided with the through hole portion 184 as the lightening portion in the present invention.

The through hole portion 184 is formed in a substantially rectangular shape,
The shutter face plate 15 is provided substantially at the center of the shutter face plate 151.
1 is provided so as to penetrate in the plate thickness direction, and as shown in FIG. 18, when the opening 14 (hub hole 56) is closed, there is no portion facing the opening 14 (disc cartridge 10).
(Not communicating in the thickness direction).

That is, the through-hole portion 184 is formed between the portion of the shutter face plate 151 (second shutter member 182) that closes the opening 14 when the disk medium 20 is not used and the rotary shaft 156 (opened when the disk medium 20 is not used. 1
4 is provided in a portion other than the portion that closes 4). Needless to say, the through-hole portion 184 may pass through the opening 14 (or face the opening 14) in the process of opening and closing the opening 14.

The shutter face plate 151 provided with the through hole portion 184 has a rotating shaft 156 when the opening 14 is opened and closed.
With the rotation of the shutter body 112, the shutter body 112 slides with the recess 38C (the case 30) of the base plate portion 32 and the upper surface of the lower surface plate portion 36, respectively.

Next, the operation of the disk cartridge 180 according to the third embodiment will be described, focusing on the difference from the first embodiment.

In the disc cartridge 180 having the above-mentioned structure, the second cartridge is provided except that the through hole portion 184 is provided.
Since the shutter member 182 has the same size and shape as the second shutter member 150, the opening 14 is opened and closed as shown in FIGS. 18 to 20, just like the operation of the disc cartridge 10 shown in FIGS. 4 to 7. . For this reason,
The description of the basic operation is omitted.

In the closed state of the opening 14 shown in FIG. 18, since the through hole portion 184 of the second shutter member 182 is not in communication with the opening 14, in other words, the through hole portion 184 is the lower surface plate portion. Since it is covered by 36,
Dust or the like does not enter the case 30 through the through hole 184.

Since the through hole 184 is provided in the shutter face plate 151 of the second shutter member 182, the shutter face plate 151 can be made lighter. In particular, the long shutter face plate 15 having a long distance between the rotary shaft 156 provided at one end and the portion closing the hub hole 56 formed at the other end.
In No. 1, the weight is significantly reduced, which is preferable.

Further, the through hole portion 184 has the case 30 on which the shutter face plate 151 slides as the opening 14 is opened and closed.
Since it faces both (the concave portion 38C of the base plate portion 32) and the lower surface plate portion 36, in other words, the through hole portion 184 is provided on the surface (sliding side) facing the case 30 and the lower surface plate portion 36. The shutter face plate 151 does not slide on the case 30 and the lower surface plate portion 36 in the through-hole portion 184, and the sliding area between the shutter face plate 151 and the case 30 and the lower surface plate portion 36 is reduced, so that the opening and closing of the opening 14 is prevented. Dynamic resistance is suppressed.

With these, the second shutter member 182
The driving force for rotating the opening 14 in the opening / closing direction of the opening 14 can be reduced. Specifically, the first shutter member 110 that presses and rotates the second shutter member 182 when the opening 14 is opened.
Can be reduced (the pressing force for moving the shutter engaging portion 122 rearward, that is, the loading force of the disc cartridge 10 into the drive device), and the second shutter member 182 is biased in the closing direction of the opening 14. The biasing force of the torsion spring 158 can be reduced.

As described above, in the disk cartridge according to the third embodiment, the shutter member can be reduced in weight and the sliding resistance can be suppressed, and the shutter member can be driven by an appropriate driving force to open and close the opening. .

Further, the torsion spring 158 can be miniaturized as the biasing force of the torsion spring 158 is reduced, and the operating range of the first shutter member 110 and the second shutter member 182 (that is, the miniaturization of the disk cartridge 180 can be achieved). The opening area of the opening 14) can be secured. On the contrary, it is possible to increase the opening area of the opening 14 while avoiding an increase in the size of the disk cartridge 180. Further, by reducing the weight of the shutter face plate 151, for example, the load acting on the rotation shaft 156 when the disc cartridge 180 is dropped by mistake is mitigated, and deformation or damage of the rotation shaft 156 is suppressed or prevented.

Since the shutter face plate 151 has the through hole portion 184 as the lightening portion,
The shutter face plate 151 has a simpler structure and is easier to process than, for example, a structure in which a concave portion is provided as a lightening portion, and has a higher rigidity than a structure in which a cutout portion is provided as a lightening portion. Maintained and good flatness.

In the third embodiment, the shutter face plate 151 has the preferable structure having the through hole 184 as the lightening portion. However, the present invention is not limited to this, and is shown in FIG. 21, for example. As described above, the cutout portion 186 may be provided as a lightening portion. in this case,
The opening closing portion 188 of the shutter face plate 151 and the rotating shaft 15
6, a support part 190 for supporting the 6 and an arm part 19 connecting them
2 are formed, but the opening closing portion 188, the support portion 190, and the arm portion 192 may be formed as separate parts and assembled. That is, the lightening portion in the present invention is actually formed by processing (notching, drilling, grinding, etc.) on a flat plate or the like, and other than the lightening portion integrally formed by press working or resin molding. , A space portion obtained as a result of assembling a plurality of parts. Therefore, for example, the through hole portion 184 in the third embodiment may be a through hole obtained as a result of assembling a plurality of components.

Needless to say, for example, the above-described lightening portion may be provided with a concave portion.
Further, the lightening portion is not limited to one configuration, and for example, a configuration including a plurality of through hole portions 184 (may be round holes or slits), or one or more through holes, respectively. The configuration may be such that the portion 184, the cutout portion 186, and the concave portion are appropriately combined.

Furthermore, in the third embodiment, the shutter face plate 151 slides on both the case 30 and the lower face plate portion 36, but the present invention is not limited to this.
For example, the shutter face plate 151 and the shutter body 112
It is also possible to adopt a configuration in which and slide only on either one of the case 30 and the lower surface plate portion 36. Further, for example, the shutter face plate 151 may not slide on either the case 30 or the lower face plate portion 36, but in this case, the shutter face plate 1
Only the effect of reducing the weight of 51 can be obtained. Even in these cases, the shutter face plate 151 is provided with the through hole portion 184 as a lightening portion in consideration of weight reduction, rigidity ensuring, workability improvement by not requiring identification of the sliding surface during processing, and the like. It is desirable to have. (Fourth Embodiment) Next, a disk cartridge 200 according to a fourth embodiment of the present invention will be described.
The parts and portions that are basically the same as those in the first embodiment are given the same reference numerals as those in the first embodiment, and the description thereof is omitted.

As shown in FIGS. 22 and 23, the disc cartridge 200 has a second shutter member 202 instead of the second shutter member 150. The second shutter member 202 includes the shutter face plate 151 (abutting portion 152), the pressed piece 154, and the rotating shaft 156 (sliding 156A) in that the second shutter member 202 is the second shutter according to the first embodiment. It is common with the member 150.

On the other hand, the second shutter member 202 is different from the second shutter member 150 according to the above-described first embodiment in that the shutter face plate 151 is provided with the sliding projections 206 and 210. The shutter face plate 151 in the third embodiment is made of, for example, a metal material (thin plate) such as stainless steel. On the other hand, the material of the shutter body 112 is not limited, and may be, for example, a resin material, a metal material, or a combination thereof (including the above two-layer structure).
Etc.

Hereinafter, the sliding projections 206 and 210 of the shutter face plate 151 constituting the second shutter member 202 will be described. The second shutter member 202 will be described below.
When referring to the front, rear, left, and right directions, basically, the front, rear, left, and right directions of the second shutter member 202 in the closed state of the opening 14 are indicated.

The abutting portion 152 of the shutter face plate 151
A sliding protrusion 206 is provided on the first corner portion 204, which is an acute right front corner portion sandwiched between the (oblique side portion) and the right side portion (the right end portion along the front-rear direction). The sliding protrusion 206 is an upward protrusion 20 as a case-side protrusion protruding toward the case 30 (base plate portion 32) side in the plate thickness direction of the shutter face plate 151.
6A and a downward projection 206B as a cover member-side projection that protrudes toward the lower surface plate 36 side are configured as a pair.

Also, the first corner portion 2 of the shutter face plate 151
A sliding protrusion 210 is provided on the second corner portion 208 that is formed in a rearward arcuate shape. The sliding protrusion 210 is an upward protrusion 2 as a case-side protrusion protruding toward the case 30 (base plate portion 32) side in the plate thickness direction of the shutter face plate 151.
10A and a downward projection 210B as a cover member-side projection that protrudes toward the lower surface plate 36 are configured as a pair.

As shown in FIG. 27, the upward projection 206
Each of A, 210A and the downward projections 206B, 210B is formed in a spherical shape by press molding or the like.
Further, the sliding protrusion 210 (upward protrusion 210A, downward protrusion 210B), which is smaller than the sliding protrusion 206 (upward protrusion 206A, downward protrusion 206B) from the rotation shaft 156,
The projecting height from the shutter face plate 151 is smaller than the projecting height of the sliding projection 206.

That is, as shown in FIG. 28, the sliding projection 206 is always in contact (sliding) with the case 30 and the lower plate portion 36 at the upward projection 206A and the downward projection 206B.
However, the sliding protrusion 210 may slide on only one of the case 30 and the lower surface plate portion 36 or may not abut (slide) on either side depending on the warped or inclined state of the shutter face plate 151. .

27 and 28, the sliding protrusions 206 and 210 are drawn larger than the thickness of the shutter face plate 151 in order to facilitate understanding.
The projecting heights of 06 and 210 are sufficiently smaller than the plate thickness of the shutter face plate 151, and the abutting portion 152 of the shutter face plate 151 is the abutting portion 11 of the first shutter member 110.
4 is abutted well (so that the deviation in the plate thickness direction falls within the allowable range).

Further, each sliding protrusion 206, 210 is shown in FIG.
4 to 26, the second shutter member 202 is disposed at a position that does not pass through the opening 14 (the opening 54 and the opening 100) as the second shutter member 202 rotates when opening and closing the opening 14. Note that, as described in the first embodiment, the shutter face plate 151 is provided with the first corner portion 204 sandwiched between the abutting portion 152 and the right side portion (formed at an acute angle), so that the hub The window 5 for the recording / reproducing head together with the hole 56
The right rear part of 8 (a part of the opening 14) is also opened and closed.

Next, the operation of the disc cartridge 200 according to the fourth embodiment will be described, focusing on the differences from the first embodiment.

In the disk cartridge 200 having the above structure, the second shutter member 202 is the second shutter member 1 except that the sliding protrusions 206 and 210 are provided.
Since it has the same size and shape as that of 50, the operation of the disk cartridge 10 shown in FIG.
As shown in FIGS. 4 to 26, the opening 14 is opened and closed. Therefore, the description of the basic operation is omitted.

Since the sliding projection 206 is provided on the shutter face plate 151 of the second shutter member 202, the second shutter member 202 accompanying the opening and closing of the opening 14 will be described.
By the rotation about the rotation shaft 156, the sliding protrusion 206 slides smoothly on the spherical upward protrusion 206A with the case 30 (the concave portion 38C of the base plate portion 32) and at the spherical downward protrusion 206B. It smoothly slides on the lower surface plate portion 36, and the sliding on the case 30 or the lower surface plate portion 36 at (the edge portion in the plate thickness direction of) the first corner portion 204 is prevented.

Therefore, for example, even if the shutter face plate 151 of the second shutter member 202 is warped due to the curl of the material, the first corner portion 20 of the second shutter member 202 is formed.
4 does not slide on the concave portion 38C (case 30) and the lower surface plate portion 36, and wear of the case 30 and the lower surface plate portion 36 is prevented.

In particular, the second shutter member 202 (shutter face plate 151) is arranged such that the first corner portion 204 from the rotary shaft 156.
Since it has a long shape over the entire length, and the above-mentioned warp tends to occur and the amount of warp tends to increase, the sliding projection 206 causes the case 30
And, the sliding of the lower surface plate portion 36 with the first corner portion 204 and the accompanying abrasion are prevented.

Therefore, the occurrence of so-called dropout due to the amount of wear caused by wear attached to the disk medium 20 is also prevented.

Further, not only the sliding caused by wear due to the first corner portion 204 is prevented and the sliding resistance is suppressed, but also the second corner portion
The shutter members 202 are spherical upward projections 20.
6A, case 3 in a point contact state on the downward projection 206B
Since it slides with 0 or the lower surface plate portion 36, the sliding area is reduced and the sliding resistance is further suppressed. As a result, the second shutter member 202 operates smoothly (the driving force for opening and closing the opening 14 is reduced).

As described above, in the disc cartridge 200 according to the fourth embodiment, the second shutter member 2
It is possible to prevent the case 30 (base plate portion 32) and the lower surface plate portion 36 from being worn due to sliding with respect to 02.

Further, here, the sliding protrusion 206 is attached to the case 30.
Since the upward projection 206A projecting to the side and the downward projection 206B projecting to the lower surface plate portion 36 are configured as a pair, it is not necessary to identify the warp direction when processing the shutter face plate 151, and the workability is improved. .

Further, since the sliding projection 210 is also provided on the second corner portion 208 of the shutter face plate 151, the shutter face plate 151 is warped or tilted (for example, the sliding protrusion 206).
Even if the shutter face plate 151 is tilted in the warp correction direction due to, the sliding protrusion 210 abuts (slides) on the case 30 or the lower surface plate portion 36, so that the second corner 208, the case 30, and the lower surface plate portion. The second corner portion 2 is prevented from sliding with 36.
08 and the sliding wear of the case 30 and the lower surface plate portion 36 are also prevented.

In particular, the rotating shaft 156 is better than the sliding protrusion 206.
Since the sliding projection 210 that is close to the sliding projection 210 has a smaller projecting height from the surface of the shutter face plate 151 than the sliding projection 206, the sliding projection 210 is farthest from the sliding projection 206 (rotating shaft 156). The sliding projection provided on the first corner portion 204 that maximizes the amount of warp in the free state and the sliding of the case 30 and the lower surface plate portion 36 and the correction of the warp are not hindered, and the shutter face plate By correcting the warp at the middle portion (sliding protrusion 210) in the longitudinal direction of 151, the sliding protrusion 206 at the tip end is not pressed against the case 30 or the lower surface plate portion 36 with an excessive elastic force (excessive frictional drag is generated. (Not without), the sliding projection 206 surely and smoothly slides on the case 30 or the lower surface plate portion 36 to reliably prevent the wear.

Furthermore, as shown in FIGS. 24 to 26, since the sliding projections 206 and 210 are provided at the portions of the shutter face plate 151 that do not pass through the openings 14, the rotation of the second shutter member 202 is prevented. The sliding protrusions 206 and 210 do not interfere with the edge of the opening 14 due to the movement. Therefore, the second shutter member 202 operates smoothly in the whole process of opening and closing the opening 14.

As described above, since the warpage of the shutter face plate 151 is corrected by providing the sliding protrusions 206 and the like, and the sliding protrusions 206 and the like also have a function of improving the rigidity of the shutter face plate 151, the shutter face plate 151 is improved. It is also possible to reduce the thickness of 151. In this case, the second shutter member 202 is naturally lightened, and the driving force for opening and closing the opening 14 can be reduced.

In the fourth embodiment, the shutter face plate 151 made of a thin metal plate is provided with the sliding projections 206 and 210 by press molding or the like, but the present invention is not limited to this. , The shutter face plate 151 is made of a resin material, and the sliding protrusion 2 as shown in FIG.
The configuration may be such that 12, 214 are integrally provided by injection molding or the like.

The sliding projection 212 has an upwardly projecting substantially hemispherical portion as an upward projection 212A and a downwardly projecting substantially hemispherical portion as a downward projection 212B. On the other hand, the sliding protrusion 214 also includes a substantially hemispherical upward protrusion 214A and a downward protrusion 214B, and the protrusion height is smaller than that of the sliding protrusion 212. These sliding protrusions 212, 21
It is needless to say that the same effect as that of the above-described fourth embodiment can be obtained also by the configuration including No. 4. That is,
Even if the shutter face plate 151 is warped due to residual stress during molding, sliding wear due to sliding with the case 30 and the lower face plate portion 36 is prevented. In this configuration, the shutter face plate 151 (second shutter member 20) made of a resin material is used.
Wear that may occur in 2) is also prevented. Further, the shutter face plate 151 may have a two-layer structure of a metal layer and a resin layer as shown in the first embodiment. In this case, the sliding protrusion is the metal plate 160 and the resin layer 1.
Any of 62 (including both) may be formed.

Further, in the fourth embodiment and the modified examples described above, the sliding projections 206, 210, 212, and 214 have a preferable construction in which the upward projection 206A and the like and the downward projection 206B and the like are paired. However, the present invention is not limited to this, and for example, the sliding protrusion 206 may be configured by only one of the upward protrusion 206A and the downward protrusion 206B.
This configuration is suitable when the warp direction of the shutter face plate 151 is limited to one of the case 30 and the lower face plate portion 36. Further, for example, the sliding protrusion 206 and the sliding protrusion 2
The protrusion directions of 10 are different (for example, shutter face plate 15
1 includes only the upward protrusion 206A and the downward protrusion 210B).

Furthermore, in the above-described fourth embodiment and modification, the sliding projections 206 (212) and 210 are respectively formed on the first corner portion 204 and the second corner portion 208 of the shutter face plate 151.
Although the preferable configuration including (202) is adopted, the present invention is not limited to this, and, for example, the first corner portion 204 and the second corner portion 2 are included.
The sliding protrusion may be provided on only one of the 08.
In this case, it is desirable to provide the sliding protrusion 206 or the like at the first corner portion that is most distant from the rotating shaft 156. Further, for example, the shutter face plate 151 may be provided with a sliding protrusion at a position other than the first corner portion 204 and the second corner portion 208 instead of the sliding protrusions 206 and 210 or together with the sliding protrusions 206 and 210. Needless to say.

Furthermore, in the above-described fourth embodiment and modification, both the upward projection 206A and the downward projection 206B such as the sliding projection 206 are always in contact (sliding) with the case 30 and the lower surface plate portion 36. However, the present invention is not limited to this. For example, only one of the upward protrusion 206A and the downward protrusion 206B of the sliding protrusion 206 may be in contact with the case 30 or the lower surface plate portion 36. Not to mention good things.

Further, in the fourth embodiment and the modified example described above, the protrusion height of the sliding protrusions 206 and 212 is the same as that of the sliding protrusion 21.
Although the preferred configuration is larger than the protrusion height of 0, 214, the present invention is not limited to this, and for example, the sliding protrusion 20
The protruding height of 6 may be equal to or less than the protruding height of the sliding protrusion 210.

Further, in the above-described fourth embodiment and modification, the sliding projection 206 is provided at a position where it does not pass through the opening 14 as the second shutter member 202 rotates. The invention is not limited to this, and the sliding protrusion 206 may be provided at a position (for example, a portion that closes the opening 14) that passes through the opening 14 as the second shutter member 202 rotates.

Furthermore, in the fourth embodiment and the modified examples described above, the sliding projections 206 and the like have a spherical shape, but the present invention is not limited to this.
6 and the like may be formed in a curved surface shape whose outer shape in cross section is an ellipse or a parabola, and the tip of the sliding protrusion 206 or the like may be formed in a flat surface facing the case 30 or the lower surface plate portion 36. . (Fifth Embodiment) Next, a disk cartridge 220 according to a fifth embodiment of the present invention will be described.
The parts and portions that are basically the same as those in the first embodiment are given the same reference numerals as those in the first embodiment, and the description thereof is omitted.

As shown in FIGS. 30 and 31, the disc cartridge 220 includes a first shutter member 222 in place of the first shutter member 110 and a second shutter member 224 in place of the second shutter member 150. There is. The first shutter member 222 and the second shutter member 224 are respectively the first shutter member 11 and
0 and the second shutter member 150 have the same shape and dimensions, but are made of a different material.

The first shutter member 222 and the second shutter member 224 will be described below.

In the first shutter member 222, the shutter body 112 (including the pressing piece 116) and the arc-shaped guide wall portion 118 are integrally formed by resin molding. This resin material is, for example, a material having a low friction coefficient such as POM and good abrasion resistance. In addition, the shutter pull-out portion 120 connected to the arc-shaped guide wall portion 118
Is made of a thin metal plate or the like, and is elastically deformable in the thickness direction.

On the other hand, the shutter face plate 151 (including the pressed piece 154) of the second shutter member 224 is, for example,
It is made of a metallic material such as stainless steel. In addition,
The rotation shaft 156 may be made of a resin material or the like, and may be fixedly held by the shutter face plate 151 by fitting, bonding, or the like to form the second shutter member 224.

Next, the operation of the disk cartridge 220 according to the fifth embodiment will be described, focusing on the difference from the first embodiment.

In the disc cartridge 220 having the above structure, the first shutter member 222 and the second shutter member 2
Since 24 has the same size and shape as the first shutter member 110 and the second shutter member 150, respectively, the opening 14 is opened and closed in exactly the same manner as the operation of the disk cartridge 10 shown in FIGS. 4 to 7. Therefore, description and illustration of the basic operation are omitted.

The shutter body 112 of the first shutter member 222 and the shutter face plate 151 of the second shutter member 224 slide on either the case 30 or the bottom plate portion 36 as the opening 14 is opened and closed. Ok,
You may slide with both the case 30 and the lower surface plate part 36.

Since the shutter body 112 of the first shutter member 222 is made of a resin material such as POM (polyoxymethylene) and the second shutter member 224 is made of a metal material such as stainless steel, the opening is made. 14
The pressing pieces 116 that slide as they come into contact with each other as they open and close.
There is no occurrence of wear or noise between the pressed piece 154 and the pressed piece 154. For this reason, the abrasion powder will be absorbed by the bottom surface 2 of the disk medium 20.
4 does not adhere to the recording medium 4 and the occurrence of a recording or reproduction signal dropout (so-called dropout) is prevented.

As described above, in the disk cartridge 220 according to the fifth embodiment, it is possible to prevent the abrasion and the generation of the abnormal noise between the pressing piece 116 and the pressed piece 154.

Further, since the resin material forming the first shutter member 222 is a material having a low friction coefficient, the sliding resistance between the pressing piece 116 and the pressed piece 154 is reduced, and the first shutter member 222 and the second shutter are formed. The interlocking of the member 224 is smooth.

Further, the complicated first shutter member 222 having the shutter body 112 and the arc-shaped guide wall portion 118 can be easily formed by resin molding, and the arc-shaped guide wall portion 118 reinforces the shutter body 112. Since it also acts as a rib, the flatness of the shutter body 112 is also ensured. On the other hand, since the second shutter member 224 is made of a metal material, deformation (for example, deformation due to temperature change during storage of the disk cartridge) and warpage are alleviated, and flatness is secured.

Therefore, the shutter main body 112 of the first shutter member 222 and the shutter face plate 151 of the second shutter member 224, which are arranged in the flat space between the concave portion 38C of the base plate portion 32 and the lower surface plate portion 36, are respectively arranged. The concave portion 38C of the base plate portion 32 or the lower surface plate portion 3 at the edge portion
6 Contact with the upper surface is prevented, or contact resistance is reduced, and each operates smoothly.

Further, since the arc-shaped guide wall portion 118 is made of a resin material, even if some distortion occurs during molding, this distortion is absorbed by the elastic deformation due to the assembly, and the base plate portions that slide with each other. Unnecessary friction with the cylindrical wall 40 of 32 (for example, the cylindrical wall 40 at the end of the overhang 118B).
(Line contact or point contact with the outer peripheral surface) is prevented, and the operation of the first shutter member 222 becomes smoother (re-driving force for opening / closing the opening 14 becomes smaller).

Further, the shutter pull-out portion 12 connecting the arc-shaped guide wall portion 118 and the shutter engaging portion 122.
Since 0 is made of an elastic material, it can be elastically deformed in the thickness direction and moved from the annular groove 68 to the shutter guide groove 96 (can be deformed from an arc shape to a linear shape while continuously changing the deformation position). The moving force of the shutter engagement portion 122 in the linear direction is smoothly converted into the rotational force in the circumferential direction of the arcuate guide wall portion 118. That is, the shutter drawer 120
Makes the operation of the first shutter member 222 smoother.

In the fifth embodiment, it is preferable that the first shutter member 222 (excluding the shutter pull-out portion 120 etc.) is made of a resin material and the second shutter member 224 is made of a metal material. However, the present invention is not limited to this. For example, the first shutter member 222 may be made of a metal material and the second shutter member 224 may be made of a resin material.

Next, a modification of the fifth embodiment will be described with reference to FIG. The parts or portions basically the same as those in the first or fifth embodiment are designated by the same reference numerals as those in the first or fifth embodiment, and the description thereof will be omitted.

FIG. 32A shows the first shutter member 2
26 is shown. This first shutter member 226
Differs from the first shutter member 222 in that it has a pressing portion 228 instead of the pressing piece 116. This pressing portion 228
Is, for example, POM, PC (polycarbonate), PE
It is made of a resin material such as (polyethylene) having a good abrasion resistance and a low friction coefficient, and is formed in a small block shape. On the other hand, the shutter body 230 is made of, for example, a metal material (thin plate) such as stainless steel.

The shutter body 230 and the pressing portion 228
Means that the fixing protrusion (not shown) of the pressing portion 228 is pressed into a fixing hole (not shown) of the shutter main body 230 to be integrated.

The fifth shutter member 222 may be replaced by the first shutter member 226 instead of the first shutter member 222.
Similarly to the embodiment described above, there is no wear or noise between the pressing portion 228 and the pressed piece 154 of the second shutter member 224, and the reproduction signal is lost (so-called dropout).
Is also prevented. In addition, the first shutter member 226
The interlocking between the second shutter member 224 and the second shutter member 224 is also smooth.

Further, in the structure according to the present modification, since the shutter body 230 is made of a metal material, its flatness is surely secured. Further, since the shutter body 230 and the pressing portion 228 are integrated by press fitting, the structure and assembly are simple and the cost is low.

On the other hand, FIG. 32 (B) shows the second shutter member 232. This second shutter member 2
32 differs from the second shutter member 224 in that it has a pressed portion 234 instead of the pressed piece 154. The pressed portion 234 is made of a resin material such as POM, PC (polycarbonate), PE (polyethylene) having good wear resistance and a low friction coefficient, and is formed in a small block shape. On the other hand, the shutter face plate 151 is made of a metal material (thin plate) such as stainless steel as described above.

This shutter face plate 151 and the pressed portion 23
4 is integrated by pressing a fixing protrusion (not shown) of the pressed portion 234 into a fixing hole (not shown) of the shutter face plate 151.

Then, the disc cartridge 220 is
The first shutter member 222 may be replaced by the first shutter member 226, and the second shutter member 224 may be replaced by the second shutter member 232.

In this structure, the pressing portion 228 and the pressed portion 2 are
34 and 34 are made of a resin material such as POM having abrasion resistance and a low friction coefficient, the pressing portion 228 and the pressed portion 23 that are in sliding contact with each other as the opening 14 is opened and closed.
No wear or abnormal noise will occur between 4 and That is, in this case, although the pressing portion 228 and the pressed portion 234 are in contact with each other in the same kind of resin material, both have a low coefficient of friction and good wear resistance, so that the opening 14 opens and closes with each other. With a pressing force that acts between the pressing part 228 and the pressed part made of resin, abrasion and abnormal noise do not pose a problem.

For this reason, the abrasion powder is not transferred to the disk media 20.
It does not adhere to the lower surface 24 of the disk, and the occurrence of the loss of the recording or reproduction signal (so-called dropout) is prevented. Further, the sliding resistance between the pressing portion 228 and the pressed portion 234 is reduced, and the interlocking of the first shutter member 226 and the second shutter member 232 becomes smooth.

On the other hand, the shutter bodies 2 each having a flat plate shape
Since 30 and the shutter face plate 151 are each made of a metal material, the flatness is good. Therefore, the shutter main body 230 and the shutter face plate 1 arranged in the flat space between the concave portion 38C of the base plate portion 32 and the lower surface plate portion 36.
Reference numeral 51 denotes a recess 38 of the base plate portion 32 at each edge portion.
The contact with C or the upper surface of the lower surface plate portion 36 is prevented, or the contact resistance is reduced, and each operates smoothly.

As described above, in the disc cartridge 220 according to the modification of the fifth embodiment, the pressing portion 228 is used.
It is possible to prevent wear and noise from being generated between the pressed portion 234 and the pressed portion 234. That is, it is possible to prevent wear due to the operation of the shutter member.

Also, the shutter body 230 and the pressing portion 22
8. Since the shutter face plate 151 and the pressed portion 234 are integrated (fixed) by press fitting which is a simple joining method, the structure of the first shutter member 226 and the second shutter member 232 is simple, and the cost is low. Be promoted. Since the pressing directions of the pressing portion 228 and the pressed portion 234 are determined, the shutter body 230 and the pressing portion 228, the shutter face plate 151, and the pressed portion 234.
Does not need to be firmly integrated, and a simple joining method such as press fitting can be used.

Further, the pressing portion 228 and the pressed portion 234 are
In other words, since the resin material that constitutes P is POM, PC, or PE, in other words, the pressing portion 228 and the pressed portion 234 have wear resistance and a low friction coefficient, respectively, and are excellent in workability. Since it is made of a resin material, the structures of the first shutter member 226 and the second shutter member 232 are further simplified, and the cost is further reduced.

It goes without saying that the resin material forming the pressing portion 228 and the resin material forming the pressed portion 234 may be different.

In the above modification, the shutter body 2
Although 30 and the pressing portion 228 and the shutter face plate 151 and the pressed portion 234 are fixed by press fitting, respectively, the present invention is not limited to this. For example, one or both of the fixing portions may be bonded or screwed. Alternatively, they may be fixed to each other by ultrasonic wave fixing, ultrasonic fixing (welding), or the like.

The second shutter member 232 according to the above modification is not limited to being combined with the first shutter member 226, but may be combined with the first shutter member 110 having the metal pressing piece 116, for example. good. In this case, the same effect as that of the fifth embodiment can be obtained in terms of preventing the wear due to the opening / closing of the opening 14.

Further, the resin material in the fifth embodiment and the modified examples is not limited to POM, PC and PE, and various resin materials can be applied, but it has a low friction coefficient and abrasion resistance. It is preferably a material. On the other hand, the metal material is not limited to stainless steel, and various materials can be applied. (Sixth Embodiment) Next, a disk cartridge 240 according to a sixth embodiment of the present invention will be described.
The parts and portions that are basically the same as those in the first embodiment are given the same reference numerals as those in the first embodiment, and the description thereof is omitted.

As shown in FIGS. 33 and 34, the disc cartridge 240 includes a cylindrical wall 40 of the base plate portion 32.
In addition to the low wall portion 242 being provided, a first shutter member 244 is provided instead of the first shutter member 110.

The first shutter member 244 includes a shutter body 112 (abutting portion 114, pressing piece 116), an arcuate guide wall portion 118, and a shutter pull-out portion 120.
And a shutter engagement portion 122, which is common to the first shutter member 110 according to the first embodiment.

On the other hand, the first shutter member 244 has the engaging claw 24 which can be engaged with the lower wall portion 242 of the base plate portion 32.
6 is provided on the arcuate guide wall portion 118, which is different from the first shutter member 110 according to the first embodiment. The shutter face plate 151 and the shutter body 112 according to the sixth embodiment are not limited in material, and can be made of, for example, a resin material, a metal material, a combination thereof (including the above two-layer structure), or the like. .

The lower wall portion 242 of the base plate portion 32 and the engaging claw 246 of the first shutter member 244 will be described below.

The recording / reproducing head window portion 5 of the base plate portion 32.
A lower wall portion 242 having an upper end lower than the other portions is formed on the cylindrical wall 40 on both sides of 8. The low wall portion 242 is formed short on the right side of the recording / reproducing head window portion 58, and on the left side thereof, the left outer wall 46.
It is formed up to the vicinity of the front end portion of B (see FIG. 33).

Further, as shown in FIG. 36, the low wall portion 2
42 has a chamfered portion 242A formed in a tapered shape on the inner edge of the upper end portion thereof.
The four engaging claws 246 are engaged and slid parts. Furthermore, the circular arc-shaped guide wall portion 118 (engaging claw 246) of the first shutter member 244 can be inserted into the annular groove 68 (wide portion) of the upper surface plate portion 34 together with the cylindrical wall 40.

On the other hand, as shown in FIGS. 33 and 37,
The arc-shaped guide wall portion 118 of the first shutter member 244.
Includes a pair of engaging claws 246 as engaging portions.
The engaging claws 246 are provided on the left and right overhanging portions 118A and 118B.
From the upper end portion in the vicinity of the shutter body 112, each (one in the present embodiment) is projected substantially rearward. The engagement claw 246 has a chamfered portion 24 of the lower wall portion 242 (cylindrical wall 40) of the base plate portion 32 at its tip.
It is formed corresponding to 2A, and can be engaged with the upper end of the low wall portion 242 so as not to project radially inward of the cylindrical wall 40.

The material of the first shutter member 244 is not limited as described above, but the shutter body 112 (the pressing piece 1
16) and the arc-shaped guide wall portion 118 (engaging claw 246).
Is preferably formed integrally by resin molding having a low friction coefficient such as POM and good abrasion resistance. On the other hand, the shutter pull-out portion 120 connected to the arc-shaped guide wall portion 118 is made of a thin metal plate or the like, and is elastically deformable in the thickness direction.

The first shutter member 244 is shown in FIG.
35 and 36, the engaging claw 246 is hooked (slidably engaged) on the upper end of the lower wall portion 242 of the cylindrical wall 40 of the base plate portion 32, as shown in FIGS. As described above, the arc-shaped guide wall portion 118 together with the engaging claw 246 and the cylindrical wall 40 (the lower wall portion 242) form the annular groove 68 of the upper surface plate portion 34.
It is inserted inside and slidably arranged along the outer periphery of the cylindrical wall 40. In this state, the shutter main body 112 is disposed between the recess 38C of the base plate portion 32 and the upper surface of the lower surface plate portion 36, and normally a part of the opening 14 (mainly the recording / reproducing head window portion 58) is formed. It is blocked.

The engaging claw 246 is dimensioned so as not to project from the upper end of the cylindrical wall 40 in a state of being hooked (engaged) with the upper end of the low wall portion 242. Further, the circumferential length dimension of the low wall portion 242 on which the engaging claw 246 is hooked is determined corresponding to the sliding range of the arcuate guide wall portion 118 along the outer peripheral surface of the cylindrical wall 40. .

Next, the operation of the disk cartridge 240 according to the sixth embodiment will be described, focusing on the difference from the first embodiment.

In the disk cartridge 240 having the above structure, the first shutter member 244 has the same size and shape as the first shutter member 110 except that the engaging claws 246 are provided. The opening 14 is opened and closed, exactly like the operation of the disc cartridge 10 shown. Therefore, description and illustration of the basic operation are omitted.

The engaging claw 246 of the first shutter member 244 slides smoothly on the lower wall portion 242 of the cylindrical wall 40 as the opening 14 opens and closes, and the first shutter member 244
Does not hinder the opening and closing of the opening 14. Also,
First shutter member 244, second shutter member 150
May slide on either one of the case 30 and the lower surface plate portion 36 or may slide on both the case 30 and the lower surface plate portion 36 in accordance with the opening / closing operation of the opening 14.

On the other hand, when assembling this disc cartridge 240, first, the first shutter member 244 and the second shutter member 150 are assembled to the base plate portion 32. Specifically, the rotation shaft 156 of the second shutter member 150 is inserted from below into the shutter shaft hole 52 of the base plate portion 32, and one end portion of the torsion spring 158 is locked in the slot 156A of the rotation shaft 156. At the same time, the other end of the torsion spring 158 is locked to the spring holding portion 53 of the base plate portion 32. In addition, the engaging claw 24 of the first shutter member is provided on the upper end of the low wall portion 242 of the cylindrical wall 40 of the base plate portion 32.
6 is applied (slidably engaged), and the arc-shaped guide wall portion 11
8 along the outer peripheral surface of the cylindrical wall 40, and the shutter body 112 is arranged below the recess 38C (inside the recess 38C) (see FIG. 37).

The disc medium 20 is placed inside the cylindrical wall 40 in a state where the opening 54 of the base plate portion 32 is closed by the first shutter member 244 and the second shutter member 150. That is, the disk medium 20 is
The center core portion 26 is placed on the rib 60 while being inserted into the hub hole 56.

Next, the upper surface plate portion 34 covers the upper side of the base plate portion 32 accommodating the disk medium 20. Specifically, the peripheral wall 42 (rear wall 44, left inner wall 46A, right inner wall 48A) of the base plate portion 32 and the peripheral wall 88 of the upper surface plate portion 34.
The rear wall 90, the left inner wall 92A, and the right inner wall 94A are brought into contact with each other, and the cylindrical projection 50 of the base plate portion 32 and the positioning projection 98 of the upper surface plate portion 34 are brought into contact with each other. In this state, the cylindrical wall 40 and each upper end portion of the arc-shaped guide wall portion 118 of the first shutter member 244 (that is, the engaging claw 246).
Is included in the annular groove 68 of the upper surface plate portion 34 (see FIG. 36).

Further, while maintaining this state, the base plate portion 32 and the upper surface plate portion 34 are inverted (the lower surface 38B of the base plate portion 32 is directed upward), and the screw is inserted from the cylindrical protrusion 63 of the base plate portion 32. Is engaged with the conical portion inside the cylindrical protrusion 50 of the base plate portion 32 while being screwed into the screw hole 98A of the positioning convex portion 98 of the upper surface plate portion 34, and the upper surface plate portion 3
4 is fixed to the base plate portion 32. That is, the base plate portion 32 and the upper surface plate portion 34 are joined to form the case 30.

Then, the locking means 130 is assembled. Specifically, the upper surface plate portion 3 is attached to the cylindrical shaft 134 of the lock lever 132 that is inserted into the middle portion of the torsion spring 140.
The support shaft 86A of No. 4 is inserted, and the lock release lever 136 is projected into the first guide groove 12A from the lock release lever hole 84 of the upper surface plate portion 34. Further, one end of the torsion spring 140 is locked to the lock lever 132, and the other end is inserted into the holding hole 86B of the top plate 34. In this state, the lock claw 138 is attached to the lock engaging portion 118 of the first shutter member.
Engage D.

Finally, the bottom plate 36 is attached to the case 30. That is, the upper surface of the lower surface plate portion 36 is attached to the base plate portion
Inner wall 80A, 80B of the lower surface 38B of 2 and the upper surface plate portion 34
While contacting the respective lower end surfaces of the lower surface plate portion 36, the peripheral edge portion of the lower surface plate portion 36 is provided on the inner peripheral surface of the peripheral wall 42 (rear wall 44, the left outer wall 46B, the lower end portion of the right outer wall 48B) of the base plate portion 32 and the upper surface plate portion 34. Outer wall 7
It is fitted to the inner peripheral surface of the lower end portion of 0.

As described above, the disk cartridge 240
Is assembled.

Here, the low wall portion 24 of the base plate portion 32 is provided on the arc-shaped guide wall portion 118 of the first shutter member 244.
When the disc cartridge 240 is assembled, the engaging claw 246 that slidably engages the second cylindrical member 40 to prevent the first shutter member 244 from falling off the base plate portion 32 (the case 30) is provided. (Bottom plate part 3 at the end of assembly
Before the mounting of 6), the first shutter member 244 assembled in the initial stage of the assembly does not fall off from the case 30. Therefore, when assembling the disc cartridge 240, no complicated and careful work is required to prevent the first shutter member 244 from falling off, which improves the assembling workability of the disc cartridge 240 and shortens the assembling time. .

As described above, in the disk cartridge 240 according to the sixth embodiment, the assembling work is easy and the cost is low. Then, the assembly process of the disc cartridge 220 is stabilized, and the assembly reliability (that is, the reliability as a product) is improved.

Since the engaging claw 246 is simply hung on the upper end of the low wall portion 242 (cylindrical wall 40), the engaging hole in which the engaging claw 246 engages the cylindrical wall 40. Since it is not necessary to provide a convex portion or a convex portion, the structure is simplified and the assembling work is further facilitated.

Further, the lower wall portion 242 of the cylindrical wall 40 has a chamfered portion 242A whose inner peripheral edge at the upper end is chamfered in a tapered shape, and the tip end portion thereof is an engaging claw 246 corresponding to the chamfered portion 242A.
Is configured to be hung on the upper end of the low wall portion 242,
The first shutter member 244 causes the base plate portion 32 (case 3
0) Holds securely. That is, the first shutter member 244 is prevented from falling off the base plate portion 32 not only in the up-down direction but also in the directions (front-rear direction, left-right direction) orthogonal thereto.

Further, since the tip of the engaging claw 246 corresponds to the tapered chamfered portion 242A, the engaging claw 246 does not project to the inside of the cylindrical wall 40, or the projecting is minimized. (See Figure 36). Therefore, the interference between the engagement claw 246 and the disk medium 20 housed inside the cylindrical wall 40 can be prevented with appropriate dimensional accuracy (processing accuracy and assembly accuracy of each part).

Further, here, the arc-shaped guide wall portion 118 has projecting portions 118A and 118B extending outwardly in the width direction of the shutter body 112, and the shutter body 112 at the upper end portions of the left and right projecting portions 118A and 118B. Since the engaging claws 246 are provided at each one of the positions sandwiching each other, in other words, the shutter main body 112 and the engaging claws 246 are provided not to face each other but to be offset, and thus the base of the first shutter member 244. Assembly to the plate portion 32 becomes easy.

Since the first shutter member 244 is hooked (engaged) with the low wall portion 242 (cylindrical wall 40) of the base plate portion 32 by the engaging claws 246 provided at two locations, the base portion of the base plate portion 32 is engaged. Falling off from the plate portion 32 (case 30) is reliably prevented.

Furthermore, the engaging claw 246 is provided on the shutter body 1.
Since it is provided with 12 in between, even in the configuration in which the opening 54 of the base plate portion 32 is formed by notching a part (over the entire height) of the cylindrical wall 40 as in the sixth embodiment. The engagement claws 246 can be engaged with the cylindrical wall 40 with the first shutter member 244 closing the opening 54.

Furthermore, since the first shutter member 244 is held by the base plate portion 32 (the lower wall portion 242 of the cylindrical wall 40) via the engaging claws 246, the shutter main body 112
It is also possible to set the part where the slides on either the concave portion 38C of the base plate portion 32 or the lower surface plate portion 36.

In the sixth embodiment, the engaging claw 246 has a preferable structure in which it can be hung on the upper end portion of the low wall portion 242 (cylindrical wall 40), but the present invention is not limited to this, and for example, The engaging claw 246 may be configured to engage with a slit or an engaging groove provided in the middle portion of the cylindrical wall 40 in the height direction along the circumferential direction thereof.

In the sixth embodiment, the low wall portion 242 of the cylindrical wall 40 has the chamfered portion 242A, and the engaging claw 246 is formed corresponding to the chamfered portion 242A. The present invention is not limited to this, and for example, the engaging claw 246 can appropriately select a flat shape, a hook shape, or the like. Further, the engagement claw 246 is not limited to be formed integrally with the first shutter member 244, and may be formed as, for example, a separate component (including a case where the material is different) and attached by adhesion or the like.

Furthermore, in the sixth embodiment, the engaging claws 246 are provided at two positions sandwiching the shutter body 112 in a plan view, but the present invention is not limited to this, and the engaging claws are not limited thereto. 246 may be arranged to face the shutter body 112. This configuration is suitable when the opening 54 does not reach the cylindrical wall 40 (or the upper end portion thereof), but it is desirable that the engaging claw 246 be elastically deformable in the thickness direction. It goes without saying that the engaging claws 246 may be provided at one place or three or more places. (Seventh Embodiment) Next, a disk cartridge 250 according to a seventh embodiment of the present invention will be described. The parts and portions that are basically the same as those in the first embodiment are given the same reference numerals as those in the first embodiment, and the description thereof is omitted.

As shown in FIGS. 38 and 39, in the disc cartridge 250, a shutter shaft hole 251 is provided in the base plate portion 32 in place of the shutter shaft hole 52, and a second shutter in place of the second shutter member 150. The member 252 is provided.

The second shutter member 252 is common with the second shutter member 150 according to the first embodiment in that it has a shutter face plate 151 (abutting portion 152) and a pressed piece 154.

On the other hand, the second shutter member 252 has a rotary shaft 256 instead of the rotary shaft 156 which is simply formed in a cylindrical shape.
The second shutter member 110 according to the first embodiment is different in that the second shutter member 110 is provided. The shutter face plate 151 and the shutter body 112 according to the seventh embodiment are
There is no limitation on the respective materials, and for example, it can be constituted by a resin material, a metal material, a combination thereof (including the above two-layer structure), or the like.

Below, the shutter shaft hole 2 of the base plate portion 32
51, the rotating shaft 256 of the second shutter member 252 will be described.

A shutter shaft hole 251 as a shaft hole is provided in the vicinity of the cylindrical protrusion 50 on the left side of the base plate portion 32, and is used for supporting the second shutter member 252. The axial center position of the shutter shaft hole 251 is the same as the axial center position of the shutter shaft hole 52. This shutter shaft hole 2
As shown in FIG. 41, the hole wall of 51 is a tapered wall having a small diameter in the upper part and a large diameter in the lower part, and
6 corresponds to a tapered portion 256B (described later).

On the other hand, as shown in FIG. 42, on the shutter face plate 151 of the second shutter member 252, a rotary shaft hole 2 having a diameter larger than that of the shutter shaft hole 251 is formed in the right rear corner portion thereof.
54 is provided. The axial center position of the rotary shaft hole 254 is the same as the axial center position of the rotary shaft 156.

The second shutter member 252 is, for example, the rotating shaft 2 made of a resin material having a low friction coefficient such as POM.
It is equipped with 56. The lower part of the rotary shaft 256 is a fitting portion 256A in the shape of a short cylinder corresponding to the rotary shaft hole 254 of the shutter face plate 151. Fitting part 2 of rotating shaft 256
The upper portion of 56A is a tapered portion 256B whose outer surface is a tapered surface whose diameter is reduced upward coaxially with the fitting portion 256A.
It is said that. The upper part of the taper portion 256B is the taper portion 2
It is a small diameter portion 256C having the same diameter as the upper end portion of 56B. The upper end of the small diameter portion 256C serves as the upper end (tip) of the rotary shaft 256. As a result, the rotating shaft 256
Is rooted from the tip side (small diameter portion 256C) (tapered portion 25C).
6B) has a large diameter.

The rotating shaft 256 has a structure in which the fitting portion 256A is fitted in the rotating shaft hole 254 of the shutter face plate 151 and is always rotated integrally with the shutter face plate 151. Further, in the rotating shaft 256, the taper portion 256B corresponds to the taper wall (hole wall) of the shutter shaft hole 251 of the base plate portion 32, and the shutter shaft hole facing the outer surface (taper surface) of the taper portion 256B. It is rotatably supported by 251 (tapered wall).

The second shutter member 252 is shown in FIG.
41, and with the rotating shaft 256 inserted into the shutter shaft hole 251 of the base plate portion 32 and the pressed piece 154 inserted into the shutter guide hole 62, the concave portion of the base plate portion 32. 38C and the upper surface of the lower surface plate portion 36.

The small diameter portion 256C of the rotary shaft 256 is
A sleeve 258 as a locking member and a sleeve member is attached. The outer diameter of the sleeve 258 is larger than the minimum diameter of the tapered shutter shaft hole 251 of the base plate portion 32, and the inner diameter of the sleeve 258 is the small diameter portion 2 of the rotating shaft 256.
It is formed in a substantially cylindrical shape corresponding to 56C. The sleeve 258 is fitted and attached to the small diameter portion 256C of the rotary shaft 256 that penetrates the shutter shaft hole 251. In addition, a concave portion (holding portion) is formed on the upper end surface of the sleeve 258.
258A is formed along the diametrical direction (that is, the radial direction of the rotating shaft 256).

Further, the shutter mechanism is provided with the torsion spring 158 as the biasing means as described above. The torsion spring 158 is made of a steel wire rod, and as shown in FIG. 42, an annular portion 158A having an intermediate portion wound in an annular shape.
And a shutter-side engaging portion 158B whose one end is arranged along the diametrical direction in the upper portion of the annular portion 158A,
The other end is composed of a case side engaging portion 158C extending in a substantially tangential direction of the annular portion 158A.

This torsion spring 158 is composed of the annular portion 15
With the sleeve 258 (rotating shaft 256) inserted through 8A, the shutter side engagement portion 158B is engaged with the slot 258A of the sleeve 258, and the case side engagement portion 158C is the spring of the base plate portion 32. It is locked to the holding portion 53.

Accordingly, the second shutter member 252
Like the second shutter member 150, is always urged in the abutting direction with the first shutter member 110,
Normally, the abutting portion 152 is the first shutter member 11
The configuration is such that the abutting portion 114 of 0 abuts.

Next, the operation of the disk cartridge 250 according to the seventh embodiment will be described, focusing on the differences from the first embodiment.

In the disc cartridge 240 having the above-mentioned structure, the second shutter member 252 is provided with the second shutter member 252 except that the second shutter member 252 is supported by the shutter shaft hole 251 of the base plate portion 32 on the rotating shaft 256. Since the size and shape and the operating (rotating) range are the same as those of the member 150, the opening 14 is opened and closed in exactly the same manner as the operation of the disk cartridge 10 shown in FIGS. Therefore, description and illustration of the basic operation are omitted.

Note that the first shutter member 110 and the second shutter member 252 will change in accordance with the opening / closing operation of the opening 14.
It may slide on either one of the case 30 and the lower surface plate portion 36, or may slide on both the case 30 and the lower surface plate portion 36.

On the other hand, in assembling this disc cartridge 250, first, the first shutter member 110 and the second shutter member 252 are assembled to the base plate portion 32. Specifically, the rotary shaft 256 of the second shutter member 252 is inserted into the shutter shaft hole 251 of the base plate portion 32 from below, and the shutter face plate 151 is arranged below the recess 38C (inside the recess 38C). In this state, the sleeve 258 is fitted and fixed to the small diameter portion 256C of the rotating shaft 256 that penetrates the shutter shaft hole 251 (see FIG. 41). Also,
The sleeve 258 is connected to the annular portion 158 of the torsion spring 158.
The shutter side engaging portion 158B of the torsion spring 158 is slid on the sleeve 258 while being inserted into A.
And the case side engaging portion 158C is locked to the spring holding portion 53 of the base plate portion 32.

Then, the arc-shaped guide wall portion 118 of the first shutter member 110 is made to extend along the outer peripheral surface of the cylindrical wall 40, and the shutter main body 112 is placed below the recess 38C (recess 3).
8C).

The opening 54 of the base plate portion 32 is closed by the first shutter member 110 and the second shutter member 252, and the closed state of the opening 54 is maintained by the biasing force of the torsion spring 158. The disk medium 20 is placed inside. That is, in the disk medium 20, the center core portion 26 thereof has the hub hole 5
6 is placed on the rib 60 in a state of being inserted into the rib 6.

Next, the upper surface plate portion 34 covers the upper side of the base plate portion 32 accommodating the disk medium 20. Specifically, the peripheral wall 42 (rear wall 44, left inner wall 46A, right inner wall 48A) of the base plate portion 32 and the peripheral wall 88 of the upper surface plate portion 34.
The rear wall 90, the left inner wall 92A, and the right inner wall 94A are brought into contact with each other, and the cylindrical projection 50 of the base plate portion 32 and the positioning projection 98 of the upper surface plate portion 34 are brought into contact with each other. In this state, the upper end portions of the cylindrical wall 40 and the arc-shaped guide wall portion 118 of the first shutter member 110 are the annular grooves 6 of the upper surface plate portion 34.
8 is inserted (the same state as in FIG. 8A).

Further, while keeping this state, the base plate portion 32 and the upper surface plate portion 34 are inverted (the lower surface 38B of the base plate portion 32 is directed upward), and the cylindrical projection 63 (for position regulation) of the base plate portion 32 is held. The screw inserted from the hole 16) is screwed into the screw hole 98A of the positioning projection 98 of the upper surface plate portion 34 while engaging with the conical portion inside the cylindrical protrusion 50 of the base plate portion 32, and the upper surface plate portion 34 Is fixed to the base plate portion 32.
That is, the base plate portion 32 and the upper surface plate portion 34 are joined,
The case 30 is configured.

Then, the locking means 130 is assembled. Specifically, the upper surface plate portion 3 is attached to the cylindrical shaft 134 of the lock lever 132 that is inserted into the middle portion of the torsion spring 140.
The support shaft 86A of No. 4 is inserted, and the lock release lever 136 is projected into the first guide groove 12A from the lock release lever hole 84 of the upper surface plate portion 34. Further, one end of the torsion spring 140 is locked to the lock lever 132, and the other end is inserted into the holding hole 86B of the top plate 34. In this state, the lock claw 138 is attached to the lock engaging portion 118 of the first shutter member.
Engage D.

Finally, the bottom plate 36 is attached to the case 30. That is, the upper surface of the lower surface plate portion 36 is attached to the base plate portion 3
Inner wall 80A, 80B of the lower surface 38B of 2 and the upper surface plate portion 34
While contacting the respective lower end surfaces of the lower surface plate portion 36, the peripheral edge portion of the lower surface plate portion 36 is provided on the inner peripheral surface of the peripheral wall 42 (rear wall 44, the left outer wall 46B, the lower end portion of the right outer wall 48B) of the base plate portion 32 and the upper surface plate portion 34. Outer wall 7
It is fitted to the inner peripheral surface of the lower end portion of 0.

As described above, the disk cartridge 250
Is completed.

Here, the rotation shaft 256 of the second shutter member 252 penetrating the shutter shaft hole 251 has a maximum outer diameter of the shutter shaft hole 251 of the base plate portion 32 in the initial stage of the assembly process of the disc cartridge 250. Since the sleeve 258 having a diameter larger than the small diameter (that is, unable to pass through the shutter shaft hole 251) is fitted and fixed, at the time of assembling the disc cartridge 250 (before attaching the lower surface plate portion 36).
In addition, the second shutter member 252 does not fall off the base plate portion 32 (case 30).

Therefore, when assembling the disc cartridge 250, no complicated and careful work is required to prevent the second shutter member 252 from falling off, and the assembling workability is improved and the assembling time is shortened.

Further, the sleeve 258 is formed in a substantially cylindrical shape, and is simply the small diameter portion 25 located on the tip side of the rotating shaft 256.
6C, the disc cartridge 250 can be more easily assembled.

As described above, in the disc cartridge 250 according to the seventh embodiment, the assembling work is easy and the cost is low. Then, the assembly process of the disc cartridge 220 is stabilized, and the assembly reliability (that is, the reliability as a product) is improved.

Here, the sleeve 2 is slid onto the sleeve 2
58A is provided, and the shutter side engaging portion 158B of the torsion spring 158 is simply engaged (inserted) with the slide 258A (without performing fastening by a fastening means such as a press bolt or performing firm fitting). Since the second shutter member 252 can be biased in the abutting direction with the first shutter member 110, the assembly of the disc cartridge 250 becomes easier.

Further, since the torsion spring 158 urges the second shutter member 252 with the sleeve 258 inserted through the annular portion 158A of the torsion spring 158, the torsion spring 158 is preferably accommodated in the limited space of the disc cartridge 250 (case 30). To be done.

Furthermore, since the second shutter member 252 is held on the base plate portion 32 by the sleeve 258,
The base plate portion 32 is a portion where the shutter face plate 151 slides.
It can also be set to either one of the concave portion 38C and the lower surface plate portion 36.

On the other hand, the rotary shaft 256 has a taper portion 256B which is the root (in the vicinity of a portion fixed to the shutter face plate 151).
Is larger than the small diameter portion 256C at the tip, the strength at the root is improved. Therefore, for example, when the disc cartridge 250 is dropped due to an error, the root of the rotation shaft (particularly, the fitting portion 256A and the taper portion 2 is
The stress acting on (the boundary portion with 56B) is relaxed, and the rotation shaft 256 is prevented from being damaged.

As described above, in the disk cartridge 250 according to the seventh embodiment, the second shutter member 2
The rotation shaft 256 of 52 can be prevented from being damaged, and the reliability is improved.

Further, the rotary shaft 256 has a tapered portion 25.
6B is rotatably supported by a shutter shaft hole 251 that is a tapered wall facing the outer surface (tapered surface) of 6B, and therefore, for example, when the disk cartridge 250 falls, the rotating shaft 25
A part of the force acting in the radial direction (tilt direction) of 6 is converted into the axial force of the rotating shaft 256 according to the taper angle of the taper portion 256B. That is, the force acting on the rotary shaft 256 is dispersed, and the rotary shaft 256 is reliably prevented from being damaged.

Further, similarly, the force acting around the shutter shaft hole 251 is also dispersed in the surface direction (front and rear and left and right) of the base plate portion 32 and the plate thickness direction (up and down direction).
Damage to the base plate portion 32 is also prevented.

Furthermore, since the rotary shaft 256 has its diameter continuously changed by the taper portion 256B located between the large-diameter fitting portion 256A and the small-diameter portion 256C, the stress concentration coefficient is It becomes smaller and the applied stress is further relaxed.

In the seventh embodiment, the sleeve 258 having the slot 258A for engaging and holding the shutter side engaging portion 158B of the torsion spring 158 is provided, but the present invention is not limited to this. However, the configuration according to the modification shown in FIG. 43 may be adopted.

In FIG. 43, a convex portion (holding portion) which is formed in a substantially cylindrical shape having the same inner and outer diameters as the sleeve 258 and which projects in the radial direction (that is, the radial direction of the rotating shaft 256).
A sleeve 260 is shown having an engaging projection 260A as shown in FIG. Further, in FIG. 11, the annular portion 158 of the middle portion is shown.
A, a case-side engagement portion 158C at the other end, and a ring-shaped shutter-side engagement portion 262 formed at one end through which the engagement protrusion 260A can be inserted.
64 is shown.

The torsion spring 264 is provided in the annular portion 15
8A with the sleeve 260 inserted, the engagement protrusion 260A is engaged with the shutter side engagement portion 262 in the inserted state, and the case side engagement portion 158C is attached with the base plate portion 32.
Of the second shutter member 25
2 in the closing direction of the hub hole 56 (first shutter member 110
It is configured to urge in the abutting direction with).

With this structure, the same effect as that of the seventh embodiment can be obtained. That is, the sleeve 260
By the base plate portion 32 of the second shutter member 252.
It is prevented from falling off from the (case 30), the torsion spring 264 is easily assembled, and the disc cartridge 250 is easily assembled. Further, damage to the rotary shaft 256 of the second shutter member 252 can be prevented, and reliability is improved.

Further, in the seventh embodiment and the modified examples described above, the locking member is the substantially cylindrical sleeves 258 and 260, but the present invention is not limited to this.
The locking member may have any shape as long as it cannot pass through the shutter shaft hole 251 when connected to the rotating shaft 256. Therefore, for example, instead of the sleeve 258 or the like, a locking member formed in a polygonal shape such as a rectangle or an ellipse in a plan view may be provided, or a rod-shaped locking member may be provided. Further, the respective locking members including the sleeve 258 are not limited to being fitted to the rotary shaft 256, but may be fixed to the rotary shaft by, for example, fastening means such as adhesion or screws, elastically deformable hook members and claw members, and the like. May be connected.

Further, in the seventh embodiment and the modified examples described above, the rotation shaft 256 is fitted to the shutter face plate 151 of the second shutter member 252, which is a preferable structure.
The present invention is not limited to this, and the rotating shaft 256 may be provided on the shutter face plate 151 by adhesion or integral molding, for example.

Furthermore, in the above-described embodiment, the rotary shaft 256 has the preferable structure having the taper portion 256B, but the present invention is not limited to this, and for example, the rotary shaft 25.
6 may be formed in a stepped shape having a short cylindrical intermediate portion (which may have the same diameter as the fitting portion 256A) instead of the tapered portion 256B. In this case, it is desirable that the stepped portion that is the boundary with the small diameter portion 256C be located inside the shutter shaft hole 251 that has a stepped shape like the rotating shaft 256, and that the shutter shaft hole 251 has a small diameter portion. It is desirable to support the pivot shaft 256 at 256C.

As described above, in the seventh embodiment and the modified examples, the disk cartridge 250 has a preferable structure that is easy to assemble and improves the drop strength. However, the present invention is not limited to this, and is simply Disk cartridge 250
In order to facilitate the assembly of the rotary shaft 256, the diameter of the base of the rotary shaft 256 does not have to be larger than that of the tip (for example, the rotary shaft 256 may be formed in a simple columnar shape), or the rotary shaft 256 may be simply formed.
When the drop strength of the (disk cartridge 250) is to be improved, the torsion spring 158 may be directly locked to the rotary shaft 256 to eliminate the locking member such as the sleeve 258.

Incidentally, in the above-mentioned respective embodiments, the disk cartridges 10, 170, 180, 200, 2 are respectively provided.
Although 20, 240, and 250 are shown, the present invention is not limited to this, and it is also possible to appropriately combine some or all of the characteristic components of the disk cartridge in each embodiment and each modification. it can.

Particularly, in order to open and close the opening 14 with an appropriate driving force, it is preferable to combine the first shutter member 172 and the second shutter member 182, and further, the shutter main body 17 of these first shutter members 172.
4. Shutter face plate 151 of second shutter member 182
May have a two-layer structure including a metal plate 160 and a resin layer 162, respectively.

In order to prevent wear due to opening / closing of the opening 14, a combination of the first shutter member 222 (226) and the second shutter member 224 in the fifth embodiment, or the first shutter member 226. And the second shutter member 232, the sliding projections 206, 2 are formed on the shutter face plate 151 of the second shutter member 224.
It is preferable to provide 10 (212, 214).

Further, in order to facilitate the assembly of the disc cartridge, it is preferable to combine the first shutter member 244 (the lower wall portion 242 of the cylindrical wall 40) and the second shutter member 252 (sleeve 258).

The best embodiment of the present invention is the first shutter member 172 and the second shutter member 1.
In the configuration in which the shutter main body 174 of the first shutter member 172 and the shutter face plate 151 of the second shutter member 182 have a two-layer structure composed of a metal plate 160 and a resin layer 162, respectively, the first shutter member 172 has a pressing portion 228 instead of the pressing piece 116, and the low wall portion 2 of the case 30.
The engaging claw 246 that engages with the arc-shaped guide wall portion 118
And a pressed piece 154 made of a material different from that of the pressing portion 228.
Alternatively, the second shutter member 182 having the pressed portion 234 made of the same material as the pressing portion 228 has the sliding protrusions 206 and 210 on the shutter face plate 151 and is held by the sleeve 258 while being inserted into the shutter shaft hole 251 of the case 30. The rotary shaft 256 has a rotating shaft 256.

[0518] Note that the sliding projection 2 is attached to the shutter face plate 151.
06, 210 (212, 214) are provided, the shutter face plate 151 has a metal plate 160 and a resin layer 16
Even if it is not a two-layer structure with 2, the best embodiment of the present invention is constituted.

Further, in each of the above embodiments, part of the right rear portion of the recording / reproducing head window 58 is provided with the second shutter members 150, 182 in order to downsize the shutter mechanism (reduce the rotation range). The shutter face plates 151 of 202, 224, and 252 are configured to be opened and closed, but the present invention is not limited to this, and the first shutter members 110 and 17 are not limited thereto.
2, 222, 226, 244 shutter body 112,
It is needless to say that the recording and reproducing head window portion 58 may be opened and closed as a whole by 174 and 230.

Furthermore, in each of the above-described embodiments and each modification, the second shutter members 150, 182, 202, 224, 232, 25 which rotate about the rotation shafts 156, 256 are used.
2 mainly opens and closes the hub hole 56, but the present invention is not limited to this. For example, the second shutter member 150 may be used.
Instead of or together with the hub hole 56
You may open and close the other part of. That is, the disk cartridges 10, 170, 180, 200, 220, 24
Nos. 0 and 250 are not limited to the configuration in which the rotary shafts 156 and 256 and the shutter shaft holes 52 and 251 are arranged on the outer side in the radial direction of the disk medium 20, respectively, and the rotary shaft 256 and the shutter shaft hole 251 are included in the disk medium 20. It may be provided in a portion facing. Therefore, for example, the configuration may be such that the second shutter member 150 and the like rotate about the rotation shaft 156 provided at a position facing the disk medium 20 to open and close the recording / reproducing head window 58.

Further, in the above-mentioned respective embodiments and respective modifications, the rotary shafts 156, 256 are provided with the second shutter member 15.
0, 182, 202, 224, 232, and 252 are provided on the shutter face plate 151, but the present invention is not limited to this. For example, the rotating shaft 256 and the like are provided on the lower surface 38B of the base plate portion 32 and the like. It may be provided in the concave portion 38C and rotatably inserted into a rotary shaft hole 254 of the shutter face plate 151 (which may be configured to have a tapered wall similar to the shutter shaft hole 251).

Furthermore, the second shutter member 150,
182, 202, 224, 232, 252 are hub holes 5
It is needless to say that the structure is not limited to the structure in which the first shutter member 110 is pressed (interlocked) when 6 is opened, and may be driven independently. Further, the second shutter member 150 and the like may independently open and close a predetermined opening for accessing the disc medium 20.

Further, in the above-described embodiment and each modification, the disk medium 20 is of a single-sided recording type, and the opening 14 is provided below (including the front), but the present invention is not limited to this. Instead, for example, the disk medium 20 may be a double-sided recording type, and the opening 14 may be provided above, and shutter members for opening and closing the upper and lower openings may be arranged. Also, the opening 14
Needless to say, the structure is not limited to the structure in which the hub hole 56 and the recording / reproducing head window portion 58 are provided in series, and these may be formed separately.

[0524]

As described above, the disk cartridge shutter according to the present invention has excellent slidability and light weight, and has an excellent effect of suppressing warpage in the plate thickness direction.

Further, the disc cartridge according to the present invention has an excellent effect that the shutter member can be driven with an appropriate driving force to open and close the opening.

[Brief description of drawings]

1A and 1B are views showing the outer appearance of a disk cartridge according to a first embodiment of the present invention, in which FIG. 1A is a perspective view seen from diagonally front upper side, and FIG. It is a figure.

FIG. 2 is an exploded perspective view of the disc cartridge according to the first embodiment of the present invention seen from above.

FIG. 3 is an exploded perspective view of the disc cartridge according to the first embodiment of the present invention seen from below.

FIG. 4 is a bottom view showing the entire configuration of the disc cartridge according to the first embodiment of the present invention in a state where the opening is closed, with the lower surface plate part removed and a part cut away.

FIG. 5 is a diagram corresponding to FIG. 4 showing an unlocked state of the disc cartridge according to the first embodiment of the present invention.

FIG. 6 is a view corresponding to FIG. 4, showing an opening process of the opening of the disc cartridge according to the first embodiment of the invention.

FIG. 7 is a view corresponding to FIG. 4 showing an open state of the opening of the disc cartridge according to the first embodiment of the present invention.

8A is a sectional view taken along the line 8A-8A in FIG.
FIG. 8B is a sectional view taken along line 8B-8B in FIG.

FIG. 9 is a perspective view showing a modified example of the second shutter member that constitutes the disc cartridge according to the first embodiment of the invention.

FIG. 10 is an exploded perspective view of the disc cartridge according to the second embodiment of the present invention seen from above.

FIG. 11 is an exploded perspective view of the disc cartridge according to the second embodiment of the present invention seen from below.

FIG. 12 is a bottom view showing the entire configuration of the disc cartridge according to the second embodiment of the present invention in a state where the opening is closed, with the lower surface plate part removed and a part cut away.

FIG. 13 is a view corresponding to FIG. 12 showing an opening process of the opening of the disc cartridge according to the second embodiment of the invention.

FIG. 14 is a diagram corresponding to FIG. 12 showing an open state of the opening of the disc cartridge according to the second embodiment of the present invention.

FIG. 15 is a bottom view showing the configuration of the first shutter member according to the second embodiment of the invention.

FIG. 16 is an exploded perspective view of the disc cartridge according to the third embodiment of the present invention seen from above.

FIG. 17 is an exploded perspective view of the disc cartridge according to the third embodiment of the present invention seen from below.

FIG. 18 is a bottom view showing the overall configuration of the disk cartridge according to the third embodiment of the present invention in a state where the opening is closed, with the lower surface plate part removed and a part cut away.

FIG. 19 is a view corresponding to FIG. 18, showing an opening process of the disc cartridge according to the third embodiment of the present invention.

FIG. 20 is a diagram corresponding to FIG. 18 showing an open state of the opening of the disc cartridge according to the third embodiment of the present invention.

FIG. 21 is a perspective view showing a modified example of the second shutter member that constitutes the disc cartridge according to the third embodiment of the invention.

FIG. 22 is an exploded perspective view of the disc cartridge according to the fourth embodiment of the present invention seen from above.

FIG. 23 is an exploded perspective view of the disc cartridge according to the fourth embodiment of the present invention seen from below.

FIG. 24 is a bottom view showing the entire configuration of the disc cartridge according to the fourth embodiment of the present invention in a state where the opening is closed, with the lower surface plate part removed and a part cut away.

FIG. 25 is a view corresponding to FIG. 24 showing the opening process of the opening of the disc cartridge according to the fourth embodiment of the invention.

FIG. 26 is a view corresponding to FIG. 24 showing an open state of the opening of the disc cartridge according to the fourth embodiment of the present invention.

FIG. 27 is a side view of a second shutter member that constitutes a disc cartridge according to the fourth embodiment of the present invention.

FIG. 28 is a cross-sectional view showing a schematic arrangement state of a second shutter member that constitutes a disc cartridge according to the fourth embodiment of the present invention.

FIG. 29 is a view, corresponding to FIG. 28, showing a modification of the second shutter member constituting the disc cartridge according to the fourth embodiment of the invention.

FIG. 30 is an exploded perspective view of the disc cartridge according to the fifth embodiment of the present invention seen from above.

FIG. 31 is an exploded perspective view of the disc cartridge according to the fifth embodiment of the present invention seen from below.

32A is a perspective view showing a modified example of the first shutter member constituting the disc cartridge according to the fifth embodiment of the present invention, and FIG. 32B is the fifth embodiment of the present invention. It is a perspective view showing a modification of the 2nd shutter member which constitutes the disc cartridge which concerns.

FIG. 33 is an exploded perspective view of the disc cartridge according to the sixth embodiment of the present invention seen from above.

FIG. 34 is an exploded perspective view of the disc cartridge according to the sixth embodiment of the present invention seen from below.

FIG. 35 is a bottom view showing the overall configuration of the disc cartridge according to the sixth embodiment of the present invention in a state in which the opening is closed, in which the lower surface plate portion is removed and a part is cut away.

36 is a cross-sectional view taken along the line 36-36 of FIG. 35.

FIG. 37 is a perspective view showing a first shutter member that constitutes the disc cartridge according to the sixth embodiment.

FIG. 38 is an exploded perspective view of the disc cartridge according to the seventh embodiment of the present invention seen from above.

FIG. 39 is an exploded perspective view of the disc cartridge according to the seventh embodiment of the present invention seen from below.

FIG. 40 is a bottom view showing the entire configuration of the disk cartridge according to the seventh embodiment of the present invention in a state where the opening is closed, with the lower surface plate part removed and a part cut away.

41 is a cross-sectional view taken along the line 41-41 of FIG. 40.

FIG. 42 is a perspective view showing a rotating shaft, a sleeve, and a torsion spring that form a disc cartridge according to a seventh embodiment of the invention.

FIG. 43 is a perspective view showing a modified example of the sleeve and the torsion spring that form the disc cartridge according to the seventh embodiment of the invention.

FIG. 44 is an exploded perspective view showing a conventional disc cartridge.

[Explanation of symbols]

10 Disc Cartridge 14 Opening (First Opening, Second Opening) 20 Disk Media 30 Case 32 Base Plate (Lower Shell, Case) 34 Upper Surface Plate (Upper Shell, Case) 36 Lower Surface Plate (Cover Member) 40 Cylindrical Wall (Wall portion) 56 Hub hole (opening, second opening) 58 Recording / reproducing window portion (opening, first opening) 110 First shutter member (shutter member) 112 Shutter body (shutter for disc cartridge) 116 Pressing piece (pressing) Part, pressing part) 118 arc guide wall part (arc guide part) 150 second shutter member (shutter member) 151 shutter face plate (shutter for disk cartridge) 154 pressed piece (press part) 156 rotation axis (rotation center) ) 158 Torsion spring (biasing means) 160 Metal plate (metal layer) 162 Oil layer (resin material) 170 Disc cartridge 172 First shutter member (shutter member) 176 Pressing portion 180 Disc cartridge 182 Second shutter member (shutter member) 184 Through hole portion (lightening portion) 186 Notch portion (lightening portion) ) 200 disk cartridge 202 second shutter member (shutter member) 204 first corner (corner) 206 sliding protrusion 206A upward protrusion (case side protrusion) 206B downward protrusion (cover member side protrusion) 208 second corner (Corner) 210 Sliding projection 210A Upward projection (Case side projection) 210B Downward projection (Cover member side projection) 212, 214 Sliding projection 212A, 214A Upward projection (Case side projection) 212B, 214B Downward projection (Cover member side protrusion) 220 Disc cartridges 222, 226 First shutter member (shutter member) 224, 232 Second shutter member (shutter member) 228 Pressed portion (pressed portion) 230 Shutter body 234 Pressed portion (pressed portion) 240 Disk cartridge 242 Low wall portion (wall portion) 242A Chamfer Part 244 First shutter member (shutter member) 246 Engaging claw (engaging part) 250 Disk cartridge 251 Shutter shaft hole (shaft hole) 252 Second shutter member (shutter member) 256 Rotating shaft 258 Sleeve (locking member) 258A Sliding (holding portion, concave portion) 260 Sleeve (locking member) 260A Engagement protrusion (holding portion, convex portion) 264 Torsion spring (biasing means)

   ─────────────────────────────────────────────────── ─── Continued front page    (31) Priority claim number Japanese Patent Application No. 2001-77024 (P2001-77024) (32) Priority date March 16, 2001 (March 16, 2001) (33) Priority claiming country Japan (JP) (31) Priority claim number Japanese Patent Application No. 2001-121273 (P2001-121273) (32) Priority date April 19, 2001 (April 19, 2001) (33) Priority claiming country Japan (JP) (31) Priority claim number Japanese Patent Application No. 2001-141910 (P2001-141910) (32) Priority date May 11, 2001 (May 11, 2001) (33) Priority claiming country Japan (JP) (31) Priority claim number Japanese Patent Application No. 2001-147818 (P2001-147818) (32) Priority date May 17, 2001 (May 17, 2001) (33) Priority claiming country Japan (JP) (31) Priority claim number Japanese Patent Application 2001-159533 (P2001-159533) (32) Priority date May 28, 2001 (May 28, 2001) (33) Priority claiming country Japan (JP)

Claims (37)

[Claims] 1. A disk medium disposed between a case that rotatably accommodates a disk-shaped disk medium and a cover member that covers the outside of the case, and that is provided in communication with the case and the cover member. Is a shutter for a thin disk cartridge that opens and closes an opening for access to the case while sliding with the case or the cover member, and a metal plate whose affinity to resin is enhanced by an electrochemical surface treatment, A shutter for a disc cartridge having a two-layer structure including a resin layer formed by insert-molding a metal plate in resin. 2. The disk cartridge shutter according to claim 1, wherein the metal plate is made of stainless steel and has a roughened joint surface with the resin layer. 3. The surface of the resin layer is a sliding surface with respect to the case or cover member.
Alternatively, the disk cartridge shutter according to claim 2. 4. The resin material is polyacetal, polyphenylene sulfide, polybutylene terephthalate,
The shutter for a disk cartridge according to any one of claims 1 to 3, which is one of polyamide and polycarbonate. 5. A solid lubricant is mixed with the resin material,
The disk cartridge shutter according to any one of claims 1 to 4, wherein: 6. The disk cartridge shutter according to claim 1, wherein the surface of the metal plate is treated to improve slidability. 7. A case for rotatably accommodating a disk-shaped disk medium, a first opening provided in the case for accessing a recording surface of the disk medium, and a central portion of the case, A second opening for accessing the central portion of the disk medium, a first shutter member capable of opening and closing the first opening, a second shutter member capable of opening and closing the second opening, the first opening and the first opening A cover member having an opening corresponding to two openings and accommodating the first shutter member and the second shutter member between the case and the case;
A disk cartridge in which a shutter member rotates about an axis of the disk medium to open the first opening, and the second shutter member is pressed and moved in accordance with the rotation to open the second opening. The disk cartridge according to claim 1, wherein the first shutter member is provided with a pressing portion that presses the second shutter member so as to protrude outward from an end portion of the first shutter member. 8. A disc cartridge in which a flat plate shutter member moves to open and close at least a part of an opening provided in a case rotatably accommodating a disc-shaped disc medium to access the disc medium, A disc cartridge, wherein a portion of the shutter member other than a portion that closes the opening when the disc medium is not used is provided with a lightening portion. 9. The shutter member rotates around a rotation center located outside the opening to open and close the opening, and the lightening portion is formed in the rotation center and when the disc medium is not used. The disk cartridge according to claim 8, wherein the disk cartridge is provided between the opening and a portion that closes the opening. 10. The shutter member is disposed between the case and a cover member having an opening corresponding to the opening, and slides with at least one of the case and the cover member to open and close the opening, The disc cartridge according to claim 8 or 9, wherein a lightening portion is provided on a surface of the shutter member on the sliding side. 11. The disc cartridge according to claim 8, wherein the lightening portion is a through hole that penetrates the shutter member in a plate thickness direction. 12. An opening provided in a case rotatably accommodating a disk-shaped disk medium, for accessing the disk medium, and rotating around a predetermined rotation center to open and close at least a part of the opening. A shutter member and a cover member having an opening corresponding to the opening and accommodating the shutter member between the case and the case, at the end of the shutter member, the case side and the cover. A disc cartridge, wherein a sliding protrusion that protrudes in the plate thickness direction toward at least one of the member sides is provided. 13. An opening provided in a central portion of a case that rotatably accommodates a disk-shaped disk medium, for access to the disk medium, and rotatably supported on one end side near a corner of the case. And a flat plate-like shutter member that opens and closes the opening by pivoting about the axis of the rotary shaft and is provided with a rotary shaft for closing the opening. A cover member having an opening formed between the cover member and the case, the cover member accommodating the shutter member between the case member and the case member, wherein the other end portion of the shutter member is at least one of the case side and the cover member side. A disk cartridge characterized in that it is provided with a curved sliding protrusion projecting toward the plate thickness direction. 14. The disc cartridge according to claim 13, wherein a plurality of corners are formed at the other end of the shutter member, and the sliding protrusions are provided at the respective corners. 15. The sliding protrusion is configured by a pair of a case-side protrusion protruding toward the case and a cover-member-side protrusion protruding toward the cover member. The disk cartridge according to claim 14. 16. A configuration in which a plurality of the sliding protrusions are provided on the same side of the shutter member, wherein a protrusion height of each sliding protrusion is dependent on a distance from the rotation center or the axis of the rotation shaft. The disk cartridge according to claim 12, wherein the disk cartridge is made larger. 17. The sliding protrusion according to claim 12, wherein the sliding protrusion is provided at a position that does not pass through the opening as the shutter member rotates. Disk cartridge. 18. Use of the disc medium, comprising: a first shutter member and a second shutter member provided in a case that rotatably accommodates a disc-shaped disc medium and capable of opening and closing an opening for accessing the disc medium. At times, in the disk cartridge in which the first shutter member moves while pressing the second shutter member to open the opening, the first shutter member and the second shutter member are made of a material at least in the pressing portion. A disc cartridge that is different. 19. A cylindrical wall having a substantially cylindrical shape,
A case that rotatably accommodates a disk-shaped disk medium inside the cylindrical wall, an opening provided in the case for accessing the disk medium, and a flat-plate shutter capable of closing a part of the opening. A first shutter member having a main body and an arc-shaped guide portion which is provided upright from one end of the shutter main body and curved along the cylindrical wall; and a flat plate shape capable of closing a part of the remaining portion of the opening. Formed,
A second shutter member disposed so as to interlock with the shutter main body, and when the disc medium is used, the arc-shaped guide portion moves along the cylindrical wall to rotate the shutter main body. In addition, in the disk cartridge in which the second shutter member moves while being pressed by the shutter main body at the contact portion to open the opening, the shutter main body and the second shutter member are at least the contact portion. A disc cartridge characterized by different materials. 20. The shutter body of the first shutter member and the second shutter member are housed between a cover member having an opening corresponding to the opening and the case, and the shutter body is made of a resin material. 20. The disk cartridge according to claim 19, wherein the second shutter member is made of a metal material. 21. The first shutter member connects the operation unit and the arc-shaped guide unit, which is operated when the disc medium is used and is given a moving force in a linear direction, to the moving force. To a moving force in the circumferential direction, and a thin plate-shaped connecting portion, the arc-shaped guide portion and the shutter body are integrally formed of a resin material, and the connecting portion is formed of an elastic material. The disk cartridge according to claim 19 or 20, wherein: 22. Use of the disc medium, comprising: a first shutter member and a second shutter member, which are provided in a case that rotatably accommodates a disc-shaped disc medium and can open and close an opening for accessing the disc medium. At times, in a disk cartridge in which the first shutter member presses the second shutter member while opening the opening, the pressing portion of the first shutter member and the pressed portion of the second shutter member are respectively resistant to each other. A disc cartridge comprising a resin material having abrasion resistance and a low friction coefficient. 23. Having a cylindrical wall formed in a substantially cylindrical shape,
A case that rotatably accommodates a disk-shaped disk medium inside the cylindrical wall, an opening provided in the case for accessing the disk medium, and a flat-plate shutter capable of closing a part of the opening. A first shutter member having a main body, an arc-shaped guide portion provided upright from one end of the shutter main body and curved along the cylindrical wall, and a pressing portion provided on the shutter main body; A second shutter member having a flat plate-shaped shutter face plate capable of closing a part of the remaining portion and a pressed portion which is provided on the shutter face plate and is in contact with the pressing portion, and an opening corresponding to the opening. A cover member that houses the shutter body and the shutter face plate between the case and the case, and when the disk medium is used, The arc-shaped guide portion moves along the cylindrical wall to rotate the shutter body to cause the pressing portion to press the pressed portion, and the first shutter member and the second shutter member are interlocked with each other. In the disk cartridge with the opening opened, the shutter body and the shutter face plate are each made of a metal material, and the pressing portion and the pressed portion are resins having abrasion resistance and a low friction coefficient, respectively. A disk cartridge comprising a material. 24. The fixing means for fixing the pressing portion to the shutter body and the fixing means for fixing the pressed portion to the shutter face plate are any of adhesion, screw fixing, ultrasonic fixing, and press fitting. 24. The disk cartridge according to claim 23, wherein: 25. The disk cartridge according to claim 22, wherein the resin material is any one of polyacetal, polycarbonate and polyethylene. 26. A shutter member that moves along a wall of the case opens and closes at least a part of an opening that is provided in a case that rotatably accommodates a disk-shaped disc medium and that accesses the disk medium. A disc cartridge, comprising: an engagement portion provided on the shutter member, the engagement portion slidably engaging the wall portion to prevent the shutter member from falling off the case. 27. Having a cylindrical wall formed in a substantially cylindrical shape,
A lower shell that rotatably accommodates a disk-shaped disc medium inside the cylindrical wall, an upper shell that is joined to the lower shell and covers the upper side of the cylindrical wall, and the lower shell that is provided on the lower shell An opening for access to the shutter, a shutter main body that is disposed below the lower shell and can close at least a part of the opening, and is provided upright from one end of the shutter main body and along the cylindrical wall. A shutter member having a curved arc-shaped guide portion; and a cover member having an opening corresponding to the opening and accommodating the shutter body between the lower shell and at least a part of the opening. When opening and closing
In a disk cartridge that rotates the shutter body while the arc-shaped guide portion is guided along the outer surface of the cylindrical wall, the disk cartridge is provided in the arc-shaped guide portion and slidably engages with the cylindrical wall. A disc cartridge, comprising: an engaging portion that prevents the shutter member from falling off from the lower shell. 28. The disc cartridge according to claim 27, wherein the engaging portion is an engaging claw provided on an upper end portion of the arc-shaped guide portion and hooked on an upper end portion of the cylindrical wall. . 29. The disk cartridge according to claim 28, wherein an inner edge of the upper end of the cylindrical wall is chamfered in a taper shape, and a tip of the engaging claw is formed corresponding to the chamfer. . 30. The arc-shaped guide portion extends to both outer sides in the width direction of the shutter body, and the engagement portion sandwiches at least the shutter body 2.
30. Any one of claims 27 to 29, characterized in that it is provided at a location.
The disk cartridge described in the item. 31. A shutter member that opens and closes at least a part of an opening that is provided in a case that rotatably accommodates a disk-shaped disk medium and that accesses the disk medium is opened and closed by a shutter member that rotates around an axis of a rotation shaft. In the disc cartridge described above, the rotation shaft is provided in either one of the case and the shutter member, is rotatably inserted into a shaft hole provided in the other, and penetrates the shaft hole. The disc cartridge, wherein a locking member that prevents the shutter member from falling off the case is provided on the tip side of the rotating shaft. 32. A case in which a disk-shaped disk medium is rotatably accommodated, and an opening for accessing the disk medium is formed, a shaft hole provided in the case, and the shaft hole at one end. A rotatable shaft that is rotatably inserted through the shutter shaft, and a shutter member that rotates around the axis of the rotatable shaft to open and close at least a part of the opening; and an opening corresponding to the opening, A cover member for accommodating the shutter member between the case and the shutter member, the outer diameter of which is larger than that of the shaft hole, is fitted to the tip end side of the rotating shaft that penetrates the shaft hole. A disk cartridge comprising: a sleeve member that prevents the sleeve member from falling off from the case. 33. The shutter member is biased in a closing direction of the opening by a biasing means, and the locking member or the sleeve member is provided with a holding portion for holding one end of the biasing means. 33. The disk cartridge according to claim 31, wherein the disk cartridge is a disk cartridge. 34. The biasing means is a torsion spring through which the locking member or the sleeve member or the rotation shaft is inserted in an annular portion, and the holding portion is the locking member or the sleeve member. A convex portion projecting from the outer surface of the rotary shaft in the radial direction of the rotating shaft, or a concave portion provided at the tip of the locking member or the sleeve member along the radial direction of the rotating shaft. 34. The disc cartridge according to claim 33. 35. At least a part of an opening provided in a case that rotatably accommodates a disk-shaped disk medium for accessing the disk medium is opened and closed by a shutter member that rotates around an axis of a rotation shaft. In the disc cartridge described above, the rotation shaft is provided in either one of the case and the shutter member and is rotatably inserted into a shaft hole provided in the other, and the root has a larger diameter than the tip side. A disc cartridge characterized by: 36. A case in which a disk-shaped disk medium is rotatably accommodated and in which an opening for accessing the disk medium is formed, a shaft hole provided in the case, and the shaft hole at one end. And a shutter member that is rotatably inserted through the shutter shaft and that opens and closes at least a part of the opening by rotating about the axis of the rotating shaft. The shaft has a root with a larger diameter than the tip side, and is a disc cartridge. 37. At least a portion of the rotating shaft located in the shaft hole is a tapered surface, and a hole wall of the shaft hole is a tapered wall facing the tapered surface. The disk cartridge according to claim 35 or 36.