JP2002260313A - Disk chucking device and motor equipped with the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a disk chucking device which is used freely attachably and detachably, and can properly hold a recording disk constructed by bonding two disk bodies even if it is an inferior disk which has a level difference or a gap between bonded surfaces, and to provide a motor equipped with the same. SOLUTION: In the disk chucking device which can hold a recording disk D freely attachably and detachably on a turntable by engaging a claw member 34 with the inner periphery edge upper surface of the center hole of the recording disk D, the tip part of the protruding side of the claw member 34 is provided with a first inclined plane 34e on which the undersurface of the inner periphery edge of the center hole abuts in early stages of loading the recording disk D, a second inclined plane 34f which abuts on the upper surface of the inner periphery edge of the center hole in last stages of loading the recording disk, and a tip part surface 34g which is provided in parallel with a rotation axis so as to connect the space between both inclined planes 34e and 34e, and abuts on the inner peripheral surface of the center hole in the course of loading the recording disk.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention can be used in a detachable manner such as a DVD or the like, and furthermore, in order to rotate a recording disk constituted by bonding two disks, the disk is detachably mounted. The present invention relates to a disk chucking device that freely holds a recording disk and a motor including a disk chucking device for rotating the recording disk.

[0002]

2. Description of the Related Art A recording disk, such as a DVD, which is detachably used and is constructed by bonding two disk bodies together, is mounted integrally with a disk driving motor and driven to rotate when loaded into a drive unit. . The rotating body of the disk drive motor is provided with a disk chucking device for detachably holding the disk. A DVD (Digital Video Disk) which is an example of the recording disk has a diameter of 12 cm having a central hole and a thickness of 0.6.
mm, formed by laminating two disc bodies made of polycarbonate. The DVD audio, DVD video, DVD-ROM, DVD-R, D
There are VD-RAM, DVD-WO, etc., but all have the same external dimensions.

A conventional disk chucking device is disclosed in, for example, Japanese Patent Application Laid-Open No. H11-120652. A chucking mechanism (corresponding to a disk chucking device) described in FIGS. 1 to 3 of the publication discloses a disk-shaped central convex portion having substantially the same diameter as a central hole of a recording disk on a turntable on which the recording disk is mounted. The claw member having openings at three circumferential positions on the outer wall of the central convex portion, and being elastically urged radially outward through the opening to be movable inside and outside the central convex portion. The distal end protrudes from the opening. As shown in FIG. 2 of the publication, the claw member has a V-shaped acute-end cross section, and when the recording disk is fitted into the central convex portion, the inner peripheral edge lower surface of the central hole of the recording disk becomes The pawl member is urged in the axial direction to move inward in the radial direction. Thereby, each claw member is accommodated in the central convex portion, and the recording disk advances downward in the axial direction, the urging force in the axial downward direction is weakened, and the claw member is again exposed from the central convex portion, and the inner peripheral surface of the recording disk is exposed. Press. In this way, the recording disk is sandwiched between the turntable and each claw member, integrated with the disk chucking mechanism, and the mounting is completed.

[0004]

However, as described in the publication, the disk chucking device for urging the upper surface of the inner peripheral edge of the center hole of the recording disk at three locations in the circumferential direction has the following problems. . That is, since this recording disk is formed by bonding two disk bodies together, in the case of a poor recording disk D where bonding is insufficient as shown in FIG. When a gap or a step is formed on the bonding surface (see FIG. 8)
(a) is a disk with a lower disk body protruding, (b) is a disk with an upper disk body protruding, and (c) is a disk with a gap formed in the bonding surface of the disk bodies). . When the claw member comes into contact with the inner peripheral surface of the center hole of such a poor recording disk D, the surrounding area A in FIG.
As shown in, the claw member enters and gets caught in the gap formed by these gaps and steps, so that the recording disc is mounted at an angle to the turntable or mounted without evenly applying a biasing force in the circumferential direction. In some cases, a desired fixed state was not achieved, for example, the mounting itself could not be performed. If the recording disk is rotated with such insufficient rotation, the recording disk is prevented from rotating accurately, such as the axis of rotation rotating, and information is read correctly (the same applies to writing).
Can not do.

[0005] A drive device for a recording disk that is detachably used such as a DVD is used on the premise that an unspecified number of recording disks are mounted, and therefore, there is a possibility that a poor one may be mounted. Although it is desirable for the apparatus to have a configuration in which a badly fixed recording disk can be in a desired fixed state as much as possible, in a conventional disk chucking device as described in the publication, such a configuration is It wasn't.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to solve the above-mentioned problems, and a recording disk which is detachably used and is constituted by bonding two disk bodies is mounted on a turntable at an angle. An object of the present invention is to provide a disk chucking device that hardly causes mounting failures such as being mounted without applying an urging force uniformly in the circumferential direction, and being not mounted itself, and a motor including the disk chucking device.

[0007]

Means for Solving the Problems (1) In order to achieve the above object, a disk chucking device according to the present invention comprises a recording disk formed by concentrically bonding two identical disk bodies having a central hole. A turntable mounted on the turntable and having a rotation axis in a vertical direction; a circular central convex portion formed integrally and concentrically with the turntable and fitted with a central hole of a recording disk; A plurality of claw members provided at equidistant positions, each of which is biased to protrude radially outward from the outer peripheral wall of the central convex portion, and wherein a central hole is fitted to the central convex portion. For recording discs,
A disc chucking device configured to engage the plurality of claw members with the upper surface of the inner peripheral edge of the central hole so that the plurality of claw members can be detachably held on the turntable. A first inclined surface with which the lower surface of the inner peripheral edge of the central hole abuts at the initial stage of mounting the recording disk, a second inclined surface with which the inner peripheral surface of the central hole abuts at the end of mounting the recording disk, A tip surface is provided parallel to the rotation axis so as to connect the surfaces, and is in contact with the inner peripheral surface of the central hole during mounting of the recording disk.

[0008] The first inclined surface is an inclined direction in which the radial component of the urging force when the recording disk comes into contact is radially inward. As a result, the urging force acts in the direction opposite to the urging force acting on the claw member in advance, and the claw member can move into the central convex portion.

The second inclined surface is such that the axial component of the urging force acting on the recording disk based on the urging force previously applied to the claw member is axially downward and the radial component is radially outward. Direction. Also, this inclination direction is
When the recording disk is removed from the turntable, a radially inward biasing force acts on the claw member from the recording disk.
As a result, the urging force acts in a direction against the urging force acting on the claw member in advance, so that the claw member can move into the central convex portion.

The leading end surface is in sliding contact with the inner peripheral surface of the center hole of the recording disk halfway until the mounting of the recording disk at the predetermined position is completed.

When the recording disk is not mounted, the claw member is disposed so as to protrude from the outer wall of the central projection, and the tip of the claw member is positioned so as to have a diameter larger than the inner diameter of the center hole of the recording disk. However, when the recording disk acts on the first and second inclined surfaces, the recording disk protrudes and retracts from the central convex portion to allow the recording disk to be fitted.

In such a disk chucking device, since the claw member has a tip end surface, a gap or a step is formed in the inner peripheral surface of the center hole of the recording disk in the bonding surface of the two disk bodies. In addition, since the tip of the claw member cannot enter the gap formed by the gap or the step, it can be prevented from being caught. Therefore, the recording disk is properly held on the turntable.

The height of the front end face in the axial direction is preferably about 1/6 to 1/5 of the thickness of the recording disk. For example, when the recording disc is a standardized DVD, the front end face has the axial length. The directional height is at least 0.2 mm.

(2) In order to achieve the above object, another disk chucking device according to the present invention is provided with a recording disk in which two disks of the same shape having a central hole are concentrically stuck, A turntable having a rotation axis in the up-down direction, a circular central protrusion formed integrally and concentrically with the turntable, and a central hole of a recording disk fitted therein; and a circumferentially equidistant position at the central protrusion. A plurality of claw members provided and urged to protrude radially outward from the outer peripheral wall of the central convex portion, respectively, and the recording disk having a central hole fitted in the central convex portion. A disc chucking device capable of detachably holding the claw member on the turntable by engaging the plurality of claw members with an inner peripheral surface of the central hole, wherein a tip end of the claw member on a protruding side is provided. The above At the initial stage of mounting the recording disk, an inclined surface with which the inner peripheral lower surface of the central hole abuts is formed.The inclined surface is formed to be continuous with the inclined surface and parallel to the rotation axis. A distal end surface that contacts the inner peripheral surface is formed.

The inclined surface is an inclined direction in which the radial component of the urging force when the recording disk comes into contact is inward in the radial direction. As a result, the urging force acts in the direction opposite to the urging force acting on the claw member in advance, and the claw member can move into the central convex portion.

The front end surface comes into contact with the inner peripheral surface of the central hole of the recording disk while the recording disk is mounted to a predetermined position and after the mounting is completed, and constantly applies a biasing force radially outward to the recording disk. give.

When the recording disk is not mounted, the claw member is disposed so as to protrude from the outer wall of the central projection, and the tip of the claw member is located at a diameter larger than the inner diameter of the central hole of the recording disk. When the recording disk acts on the inclined surface, the recording disk protrudes and retracts from the central convex portion to allow the recording disk to be fitted.

In such a disk chucking device, the claw member has the tip end surface, so that a gap or a step is formed on the inner peripheral surface of the center hole of the recording disk in the bonding surface of the two disk bodies. In addition, since the tip of the claw member cannot enter the gap or the gap formed by the step, it can be prevented from being caught. Therefore, the recording disk is properly held on the turntable.

It is preferable that the height of the front end face in the axial direction is larger than the thickness of the recording disk. For example, when the recording disk is a standardized DVD, the height of the tip surface in the axial direction is at least 1.2 mm.

Preferably, the tip end surface is formed so as to increase contact resistance with the inner peripheral surface of the central hole of the recording disk. This is, for example, an axial direction, a horizontal direction, or a streak-shaped groove formed in a direction inclined from the axial direction on the tip end surface, a groove formed in a spot shape, a groove formed in a lattice shape,
Alternatively, a surface having a large surface roughness, or a high resistance layer formed of rubber or the like may be used.

Thus, the adhesion between the claw member and the recording disk is improved, the contact resistance is increased, and the recording disk can be further prevented from coming off the claw member.

(3) In order to achieve the above object, a motor according to the present invention is configured such that the disk chucking device rotates integrally. Accordingly, since the recording disk is held at an accurate position with respect to the disk chucking device, high rotation characteristics can be realized when the recording disk rotates together with the motor. Therefore, in a drive device for reproducing information on a recording disc,
This motor contributes to reading information with high accuracy (it may be writing)

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a disk chucking device and a motor provided with the disk chucking device according to the present invention will be described with reference to a disk drive motor used for rotating a DVD (hereinafter, referred to as a recording disk) as an example. This will be described with reference to the drawings.

That is, as shown in FIGS. 1 and 2, the motor is provided with a bearing holder 4 on a base 2 attached to a drive (not shown) for reproducing information from a recording disk. A cylindrical radial bearing 6 made of an oil-impregnated metal is fitted and fixed to the cover member 10, and a thrust bearing 8 is held at a lower end of the bearing holder 4.
The stator 12 is fixed to the outer periphery of the bearing holder 4, and the rotating shaft 14 is rotatably supported by the radial bearing 6 and the thrust bearing 8 so as to have a rotating axis in the vertical direction (axial direction). A turntable 16 having a substantially disk shape is fixed to the upper part of the head, and a drive magnet 20 is fixed to the outer periphery of the turntable 16 via a back iron 18 so as to face the stator 12.
The rotation shaft 14 is provided with a retaining structure 22 between the outer peripheral portion of the upper end of the bearing holder 4 and the inner portion of the lower surface of the turntable 16 adjacent thereto so as not to come off in the axial direction with respect to the radial bearing 6. Make up. When a predetermined current is applied to the stator 12, a magnetic field is generated, which magnetically interacts with the magnetic flux of the driving magnet 20, and the driving magnet 20 rotates with respect to the stator 12.

On the other hand, as shown in FIGS. 1 and 2, a disk chucking device provided in this motor places a recording disk D thereon and sets a rotation axis (which coincides with the rotation axis of the rotation shaft 14) in the vertical direction. A turntable 16, a disk-shaped central convex portion 24 formed integrally and concentrically with the turntable 16 and fitted with the recording disk D, and protruding radially outward from the central convex portion 24. And a claw member 34 urged in such a manner as to be able to protrude and retreat inside and outside of the central convex portion 24. An annular rubber sheet 26 is attached to the outer peripheral edge of the upper surface of the turntable 16 in order to prevent the mounted recording disk D from slipping. Turntable 16
Is made of brass, and the central convex portion 24 and the claw member 34 are made of resin.

The central projection 24 has a disk-shaped upper wall having a central hole, an outer wall extending from the outer periphery of the upper wall, a flange extending radially from a lower end of the outer wall, and an inner periphery of the upper wall. An inner peripheral wall is fitted to the cylindrical portion of the turntable 16, and the upper surface of the turntable 16 forms a hollow space inside. Also, in the central convex portion 24,
Three radially extending passages c are formed in the circumferential direction so that the claw member 34 moves, and the opening 24a and the opening 24b are formed in the outer wall and the upper wall which are part of the passage c, respectively. Is formed. Since the outer diameter of the central convex portion 24 is set to be smaller than the inner diameter of the central hole of the recording disk D by several μm, the recording disk D does not slide excessively on the central convex portion 24, and furthermore, the central convex portion 24 does not slide. 24 can be fitted without any eccentricity by being largely displaced from the center.

As shown in FIGS. 3 and 4, the claw member 34 is composed of a cylindrical portion 34a and a claw portion 34b having a ridge line in an arc shape when viewed from above. A protruding portion 34c is provided on an end surface of the cylindrical portion 34a.
There are protrusions 34d on both sides of the claw 34b.
The claw portion 34b has a protruding portion 34d on the side opposite to the cylindrical portion 34a.
The first inclined surface 34e and the second inclined surface 3
4f and a tip surface 34g are formed. The reason why the claw portion 34b has an arc-shaped ridge line in a top view is that a claw member 34 described later enhances the adhesion to the inner peripheral surface of the central hole of the recording disk D.

The first inclined surface 34e is inclined radially outward and axially downward as shown in FIGS.
The inclined surface 34f is inclined outward in the radial direction and upward in the axial direction. The distal end surface 34g is provided with the first and second inclined surfaces 34.
A curved surface parallel to the rotation axis and curved in the circumferential direction at a position where the two inclined surfaces are connected at an intermediate portion between e and 34f.
The axial length d1 of the first inclined surface 34e is equal to the second inclined surface 3e.
4f is smaller than the axial length d2. The axial length d3 of the distal end face 34g is even smaller than the lengths d1 and d2. When the recording disk D is a DVD (the thickness of the recording disk D is approximately 1.2 mm) as in the present example, it is approximately 0.5 mm. 2
mm. By making d1 smaller than d3,
The tip surface 34g is located above the claw member 34. Accordingly, when the recording disk D is placed on the rubber sheet 26, the leading end surface 34g is separated from the bonding surface of the recording disk D, so that even a poor recording disk D can be easily held properly. In addition, d3 of the tip surface 34g is:
In the case of a recording disk other than a DVD, the recording disk D
It is preferable to set the thickness to about 1/6 to 1/5 of the thickness.

The claw member 34 is formed in the passage c of the central convex portion 24.
The projecting portion 34c is attached to the coil spring 32 attached to the inner side wall at the radially inner end, and is elastically urged outward in the radial direction, so that the pair of projecting portions 34d close the opening 24a of the central projecting portion 34. By locking to the side wall to be formed, movement outward in the radial direction is restricted. This allows
The claw member 34 extends radially outward from the innermost peripheral position of the passage c when the coil spring 32 is at the minimum contraction to the outermost peripheral position where the pair of protrusions 34 d are locked to the outer wall of the central convex portion 24. Move while being elastically urged to move to the outermost position, and from the opening 24a of the central convex portion 24 to the claw portion 3
4b protrudes from the opening 24b.
The inclined surface 34e is exposed.

Next, the fixed state of the recording disk will be described together with the step of attaching and detaching the recording disk in the disk chucking device.

When the recording disk D is mounted on the disk chucking device, the recording disk D is lowered in the axial direction from above the central convex portion 24 of the disk chucking device. At the initial stage when the disc is mounted, the lower surface of the inner peripheral edge forming the center hole of the recording disc D is a claw member 34.
, And a radially inward biasing force acts on the claw member 34. When the recording disk D is further lowered, the recording disk D is moved to the first inclined surface 34e.
Is slidably contacted with the pawl member 34, a radially inward biasing force acts on the pawl member 34 more than the biasing force exerted by the coil spring 32. Therefore, the pawl member 34 moves on the passage c and is housed in the central convex portion 24. At the same time, the recording disk D is allowed to move downward in the axial direction.

When the recording disk D is further advanced, the inner peripheral surface of the central hole of the claw member 34 slides on the distal end surface 34g.
The inner peripheral upper surface forming the center hole slides on the second inclined surface 34f of the claw member 34. At this time, the urging force acting on the claw member 34 from the recording disk D is gradually alleviated at a time when the inner peripheral surface thereof slides, and the claw member 34 protrudes from the central convex portion 24. When the recording disk D is placed on the rubber sheet 26 of the turntable 16 at the final stage of loading the disk, the second inclined surface 34f of the claw member 34 is moved radially outward with respect to the upper surface of the inner peripheral edge of the center hole. Bias towards you. Since the three claw members 34 are equally arranged in the circumferential direction, a uniform urging force acts on the recording disk D from the claw members 34 around three places at intervals of 120 degrees in the circumferential direction. Claw member 3
4 moves slightly inward in the radial direction, so that a larger elastic force acts on the recording disk D than when no load is applied, and the urging force acting from the claw member 34 applies an axial component to the recording disk D. The claw member 34 and the turntable 1
6 and is fixed. The concentric alignment of the recording disk D with the disk chucking device is performed as follows.
This is achieved by balancing the urging forces from three places received from the claw member 34 when the recording disk D is mounted.

To remove the recording disk D from the disk chucking device, the recording disk D is raised in the axial direction. At this time, since the urging force acts radially inward from the recording disk D on the claw member 34 against the urging force of the coil spring 32, the claw member 34 moves on the passage c and is housed again in the central convex portion 24. At the same time, the recording disk D is allowed to move upward in the axial direction. When the recording disk D further advances, the claw member 34 moves the second inclined surface 34f, the tip surface 34g, and the first inclined surface 34e to each of the recording disks D.
Move in the radial direction in accordance with the sliding contact, and finally release the recording disk D.

In such a disk chucking device, since the claw member 34 has the distal end surface 34g in the process of attaching and detaching the recording disk D, the two disk bodies are bonded to the inner peripheral surface of the central hole of the recording disk D. Even if a gap or a step is formed on the surface, the tip of the claw member 34 is sufficiently large with respect to the size of the gap formed by the gap or the step, so that it is possible to prevent the claw member 34 from being caught without entering the gap. . Therefore, there is provided a disk chucking device in which the recording disk D is hardly mounted such that the recording disk D is mounted obliquely with respect to the turntable 16, is mounted without applying a biasing force uniformly in the circumferential direction, or is not mounted. Has become.

Further, the motor provided with the above disk chucking device is capable of holding the recording disk at an accurate position with respect to the disk chucking device even if a poor recording disk is mounted. When a suitable recording disk is rotated together with the motor, high rotation characteristics can be realized. Therefore, this motor can contribute to reading information from various recording disks with high accuracy. Some DVDs have a writing function in addition to the reading function, but can also contribute to writing with high precision as well as reading.

Next, a second embodiment of the present invention will be described with reference to the drawings by taking a disk drive motor used for rotating and driving a DVD as in the first embodiment as an example. The differences from the embodiment are the shape of the claw member and the state of contact between the claw member and the recording disk.

That is, the claw member 40 in this embodiment is
As shown in FIGS. 5 and 6, the cylindrical portion 40a and the claw portion 40b whose ridgeline in a top view is arc-shaped have a protruding portion 40c on an end surface of the cylindrical portion 40a, and both side surfaces of the claw portion 40b are respectively provided. There is a protrusion 40d. The claw portion 40b has a cylindrical portion 40a.
A first inclined surface 40e, a second inclined surface 40f, and a tip end surface 40g are formed on the opposite side to the radial direction outside of the protruding portion 40d.

As shown in FIG. 6, the first inclined surface 40e is inclined radially outward and axially downward, and the second inclined surface 40f is inclined radially outward and axially upward. .

The tip surface 40g is formed by the first and second inclined surfaces 40.
The curved surface is parallel to the rotation axis and curved in the circumferential direction at a position connecting the two inclined surfaces at an intermediate portion between e and 40f.
As shown in FIG. 7A, three grooves 40g1 extending in the circumferential direction are formed in the distal end face 40g in parallel with the axial direction. The axial length d4 of the first inclined surface 40e is larger than the axial length d6 of the second inclined surface 40f. The axial length d6 of the second inclined surface 40f is substantially the same as the thickness of the rubber sheet 26. Axial length d5 of tip surface 40g
Is larger than d4 and d6, and is approximately 1.3 mm when the recording disk D is a DVD as in this example, which is sufficiently larger than the thickness of the recording disk D. The tip surface 40
In the case of a recording disk other than a DVD, g is preferably set to be larger than the thickness of the recording disk.

As in the first embodiment, the claw member 40 is provided with a passage c of the central convex portion 24 constituting the disc chucking device.
The coil spring 32 is elastically urged radially outward by a coil spring 32 so as to be movable in a predetermined range in the radial direction.

Next, the fixed state of the recording disk will be described together with the step of attaching and detaching the recording disk in the disk chucking device of this embodiment.

In the initial stage of loading the recording disk D into the disk chucking device, the recording disk D is lowered in the axial direction from above the central convex portion 24 of the disk chucking device, and The lower surface of the inner peripheral edge forming the center hole of
The abutting force is applied to the claw member 40 radially inward on the inclined surface 40e. When the recording disk D is further lowered, a radially inward biasing force acts on the claw member 40 against the biasing force exerted by the coil spring 32 on the recording disk D while sliding on the first inclined surface 40e. The member 40 moves on the passage c and is accommodated in the central convex portion 24, and allows the recording disk D to move downward in the axial direction.

When the recording disk D is further advanced, the inner peripheral surface of the central hole of the claw member 40 slides on the distal end surface 40g. Near the upper edge of the recording disk D, the recording disk D abuts on the rubber sheet 26 and its movement is restricted. At this time, since d5 of the second inclined surface 40f is substantially the same as the thickness of the rubber sheet 26, the lower edge of the leading end surface 40g and the lower surface of the recording disk D are substantially on the same plane.

As a result, the leading end surface 40g is configured such that the entire inner peripheral surface of the central hole of the recording disk D that is opposed to the leading end surface 40g abuts. This is different from the configuration in which the leading end surface 34g of the first embodiment comes into contact with a part of the inner peripheral surface (a region of 1/6 to 1/5 of the thickness of the recording disk D).

In the first embodiment, the recording disk D is fixed between the claw member 34 and the turntable 16 in a fixed state, whereas in the present embodiment, the claw member 40 is fixed at the center of the recording disk D. This is a fixed state in which the inner peripheral surface of the hole is urged radially outward. At this time, the claw member 3 of the first embodiment
4, the claw member 40 is different from the distal end face 34g.
Since the contact area between the recording disk D and the recording disk D is large, the frictional resistance between them increases accordingly.
And the recording disk D can be fixed. Further, since a plurality of grooves 40g1 are formed in the front end face 40g, the surface is somewhat elastically deformed, and the adhesion to the recording disk D is enhanced, which contributes to preventing the claw member 40 from being detached from the recording disk D. are doing.

The removal of the recording disk D from the disk chucking device can be easily performed by raising the recording disk D in the axial direction as in the first embodiment.

The second inclined surface 40f of the claw member 40 is
At the initial stage of loading the disk, when the recording disk D comes into contact with the first inclined surface 40e of the claw member 40, the claw member 4
0 is slightly inclined downward in the axial direction to make the guide of the recording disk D smooth. Further, if the tip surface 40g of the claw member 40 can improve the adhesion to the recording disk D as described above, the number of grooves and the shape of the grooves are not limited thereto. 7), grooves extending in the axial direction are formed parallel to the circumferential direction, grooves extending in the inclined direction are formed parallel to each other as shown in FIG. 7 (c), or as shown in FIG. 7 (d). 7 (e), a V-shaped groove is formed continuously as shown in FIG. 7 (e), or a number of spot-shaped depressions are formed as shown in FIG. 7 (f). Although not shown, a rubber layer may be formed on the surface so as to increase the frictional resistance, or the surface roughness may be increased. Further, a flat surface having no irregularities on the tip surface 40g may be used.

As described above, also in the disk chucking device of the present embodiment, since the claw member 40 has the tip end surface 40g in the process of attaching and detaching the recording disk D, the recording disk D
Even if a gap or a step is formed in the bonding surface of the two disc bodies on the inner peripheral surface of the center hole of the above, the tip of the claw member 40 is sufficient for the size of the gap formed by the gap or the step. Since it is large, it can be prevented from getting into the gap without being trapped. Therefore, there is provided a disk chucking device in which the recording disk D is hardly mounted such that the recording disk D is mounted obliquely with respect to the turntable 16, is mounted without applying a biasing force uniformly in the circumferential direction, or is not mounted. Has become.

Further, in the motor provided with the above disk chucking device, the recording disk D is held at an accurate position with respect to the disk chucking device even if a poor recording disk is mounted. When a suitable recording disk is rotated together with the motor, high rotation characteristics can be realized. Therefore, this motor can contribute to reading information from various recording disks with high accuracy. Some DVDs have a writing function in addition to the reading function, but can contribute to writing with high precision in the same manner as reading.

Although the two embodiments according to the present invention have been described above, the scope of the present invention is not limited thereto, and various modifications can be made without departing from the spirit of the present invention. For example, as the recording disk D, DV
Although D is illustrated, any recording disk that can be used detachably and is configured by laminating two disk bodies is applicable. In this case, if the thickness of the recording disk is different from that of the DVD, the size of the tip surface of the claw member may be set as described above according to the thickness.

[0050]

According to the present invention, there is provided a disk chucking device in which a recording disk according to claims 1 and 2 is fixed between a claw member and a turntable, or a central hole of a recording disk according to claims 3, 4 and 5. In any of the disk chucking devices in which the recording disk is fixed to the turntable by applying a biasing force radially outward on the inner peripheral surface by the claw member, the claw member has a distal end surface when the recording disk is attached or detached. Even if a gap or a step is formed on the inner peripheral surface of the center hole of the recording disc on the bonding surface of the two disc bodies, the tip of the claw member is limited to the size of the gap formed by the gap or the step. On the other hand, since it is sufficiently large, it can be prevented from entering the gap and being caught.
Therefore, a disk chucking device that hardly causes a mounting failure such as the recording disk D being held at an angle with respect to the turntable or a mounting failure that cannot even be mounted is realized.

According to the motor of the sixth aspect, even if a poor recording disk is mounted, such a recording disk is held at an accurate position with respect to the disk chucking device. When the recording disk rotates together with the motor, high rotation characteristics can be realized.
Therefore, this motor can contribute to reading the information of the recording disk with high accuracy.

[Brief description of the drawings]

FIG. 1 is a sectional view of a motor including a disk chucking device according to a first embodiment of the present invention.

FIG. 2 is a top view of FIG. 1;

FIG. 3 is an essential part cross-sectional view showing a relationship between a claw member and a recording disk in FIG. 1;

FIG. 4 is a perspective view of the claw member of FIG. 1;

FIG. 5 is an essential part cross-sectional view showing a relationship between a claw member and a recording disk according to a second embodiment of the present invention.

FIG. 6 is a perspective view of the claw member of FIG. 5;

FIG. 7A is a front view of the claw member of FIG. 5,
(B) to (f) show modifications thereof.

FIGS. 8A to 8C are cross-sectional views of the vicinity of an inner peripheral surface forming a central hole of a poor recording disk.

FIG. 9 is a sectional view of a main part showing a case where a poor recording disk is mounted by a conventional disk chucking device.

[Explanation of symbols]

 D Recording disk 16 Turntable 24 Central projection 34, 40 Claw member 34e, 40e First inclined surface 34f, 40e Second inclined surface 34g, 40g Tip surface

Claims (6)

[Claims] 1. A recording disk comprising two disks of the same shape having a center hole and concentrically bonded to each other is mounted thereon, and a turntable having a rotation axis in a vertical direction is integrated with and concentric with the turntable. A circular central convex portion formed and fitted with the central hole of the recording disk; and provided at circumferentially equidistant positions in the central convex portion so as to project radially outward from the outer peripheral wall of the central convex portion. A plurality of claw members being biased, and engaging the plurality of claw members with the upper surface of an inner peripheral edge of the center hole with respect to the recording disk having a center hole fitted to the center protrusion. A disk chucking device adapted to be detachably held on the turntable, wherein a lower end of an inner peripheral edge of a central hole abuts on a protruding end of the claw member at an initial stage of mounting the recording disk. One inclination And the surface,
A second inclined surface that contacts the upper surface of the inner peripheral edge of the central hole at the end of loading of the recording disk; and a central hole that is provided parallel to the rotation axis so as to connect between the two inclined surfaces. A disc chucking device characterized in that a tip end surface abutting on an inner peripheral surface of the disc is formed. 2. The disk chucking device according to claim 1, wherein an axial height of the front end surface is about 1/6 to 1/5 of a thickness of the recording disk. 3. A recording disk, comprising two disks of the same shape having a central hole and concentrically bonded to each other, is mounted thereon, and a turntable having a rotation axis in a vertical direction is integrated with and concentric with the turntable. A circular central convex portion formed and fitted with the central hole of the recording disk; and provided at circumferentially equidistant positions in the central convex portion so as to project radially outward from the outer peripheral wall of the central convex portion. A plurality of claw members being urged, by engaging the plurality of claw members with the inner peripheral surface of the center hole with respect to the recording disk having a center hole fitted to the center protrusion. A disk chucking device which can be detachably held on the turntable, wherein the lower end of the inner peripheral edge of the center hole is initially contacted with the recording disk when the recording disk is mounted. With the slope that touches
A disk chuck formed continuously with the inclined surface and parallel to the rotation axis, and formed with a tip end surface which comes into contact with the inner peripheral surface of the central hole during mounting of the recording disk and at the end of mounting. King device. 4. The disk chucking device according to claim 3, wherein an axial height of the front end face is larger than a thickness of the recording disk. 5. The disk chucking device according to claim 3, wherein the front end surface is formed so as to increase contact resistance with an inner peripheral surface of a central hole of the recording disk. 6. A motor provided with a disk chucking device such that the disk chucking device according to claim 1 rotates integrally.