JP3355973B2 - Disk holding device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is used in an optical disk drive for recording or reproducing information on or from a disk medium by light or magneto-optics.
The present invention relates to a disk holding device for rolling and driving .

[0002]

2. Description of the Related Art In recent years, technology for recording and reproducing information using light has made remarkable progress. So-called CD (compact disc), CD
-ROM, laser disk and the like. Further, as an optical device for both recording and reproduction, a secondary storage device of a computer,
In recent years, its application range has been more and more widened in fields such as rewritable filing apparatuses. In addition, large-capacity optical disk devices that will serve the future market, for example, DVD
(Digital Versatile Disc) is approaching the time of market expansion.

There are optical disc standards each having its own characteristics. This stems from the demands on performance and the timing of technological advances. However, many optical disc standards are mixed,
Sacrificing compatibility is a disadvantage in terms of handling and market expansion. In particular, CDs and DVDs, each of which has a large market size in homes and the like and whose appearance is almost the same as that of a 12 cm diameter disc, are not optically directly compatible. As a result, a DVD disc can be played on a CD player, and vice versa. This is due to the difference in the substrate thickness of the disc (1.2 mm for CD, 0.6 mm for DVD ), the characteristics of the objective lens, the difference in the wavelength of the laser beam used, and the like, in order to make the DVD have a higher density than the CD. .

[0004] Therefore, there is a great demand from the market to be able to use disks of two different standards, CD and DVD, with one disk drive. A conventional disk holding device having a mechanism capable of holding two different optical disks provided in response to such a demand will be described below with reference to the drawings .

FIG . 8 shows a conventional self-holding type disk holding.
It is a block diagram of an apparatus. In FIG. 8, the disk 23 is
The disk holding mechanism 30 that can hold itself will be described. Figure
The spindle motor 34 is roughly divided into a turntable unit 36 that mainly holds the disk 23 and a drive unit 40 that rotates the disk 23.

First, the turntable unit 36 will be described. In holding the disk 23, first,
The claw member 26 interferes with the end face of the inner diameter portion of the disk 23.
The claw members 26 are provided at least at three places on the turntable 21. The claw member 26 is pressed in the outer peripheral direction by an elastic member 27, and bosses (not shown) provided on both sides of the claw member 27 are supported by guides (not shown) of the center hub 25.

On the other hand, the drive section 40 is a component mainly constituting a magnetic circuit, such as a rotor yoke 37, a magnet 38, a coil 39, a back yoke 42, and a bearing metal unit 41 for supporting the spindle shaft 24 pressed into the turntable 21. Consists of Spindle shaft 2
4 slides on the thrust receiver 46. In addition, FPC48
, A Hall element 47 is disposed on the surface of the back yoke 42 so as to face the magnet 38 .

FIG. 9 is a diagram for explaining the operation of the disk holding mechanism 30 shown in FIG. In FIG. 9, when the disc 23 is mounted, the claw-like members 26 arranged at least at three places are provided.
The disc 23 is mounted on the turntable 21 while pressing the R portion 26b from above. At this time, the claw member 26
Is pushed by the disc 23 against the elastic member 27 and retreats in the inner circumferential direction of the center hub 25 while sliding according to the guide in the center hub 25.

In this manner, the end face of the inner diameter portion of the disk 23 passes while pushing the R portion 26b of the claw-like member 26 from above. Then, the disk 23 is pushed until it comes into close contact with the slip sheet 22 stuck on the turntable 21.

Next, when the end face of the inner diameter portion of the disk 23 passes, the claw member 26 is pushed by the elastic member 27 and protrudes,
The lower inclined surface of the R portion 26 b of the claw member 26 is
Abuts on the end face of the inner diameter portion. As a result, the disk 23
It is self-supported by the claw-like members 26 arranged at least at three places. However, at this time, even if the disk 23 is eccentric with respect to the spindle shaft 24, the disk 23 is held depending on the urging force of the claw member 26 that comes into contact with the disk 23 and is rotated by the drive unit 40.

Further, referring to FIG .
The disc centering mechanism to be performed will be described. Spind
Spindle with a structure protruding upward from the drive unit 40 of the motor 34
A disk alignment mechanism 31 is mounted on the handle shaft 24.
Configuration in which the mounted turntable unit 36 is incorporated
It has become. Spindle shaft 24 is turntape
To the turntable 21 and the turntable 21
Locate the return coil spring 29 to align the disc.
Make the structure embedded inside the
Although the ring 28 is pressed by the return coil spring 29,
So that a bias is applied to the upper surface of the disk 23
It is configured to be restricted by the C-ring 43 while doing so.

The disk 23 is held by the disk 2
A magnet is embedded so that it can be pressed uniformly on three surfaces.
Magnet clamper 44 and turntable 21
The magnetic force of the rotor yoke 37
The position accuracy of the magnet clamper 44 with the turbos 45
While maintaining, the disk 23 is held.

When the disk 23 is mounted on the disk centering mechanism 31 constructed as described above and the magnet clamper 44 is closed, the surface of the disk 23 is pressed by the turntable 21 as described above, and the disk 23 The inner end surface of the inner ring 23 is pressed while following the conical surface of the rocket ring 28. As a result, the disc cannot be
It is a mechanism that is flat and aligned, but this structure makes it thinner
I can not plan.

[0014]

In the conventional disk holding device constructed as described above, in order to support a CD and a DVD having different disk thicknesses and to realize a reduction in size and thickness, a disk must be mounted. It is necessary that the disk holding device be self-holding and be simultaneously aligned. However, reducing the thickness of the turntable, which is the base material, is particularly difficult for a turntable made of a resin material in terms of rigidity and the like.
This will greatly affect the accuracy of surface runout and the like . In addition, in order to mount a self-holding and alignable mechanism on the turntable unit, it has been difficult to reduce the thickness of the disk 23 in the thickness direction.

[0015] For example, a type of notebook built into a notebook PC
The spindle motor built into the live device is a spindle
When viewed as a motor unit, the total height must be within 9.8 mm.
If it is, it is difficult to mount. Therefore, notebook PC
The spindle motor unit built in the
A structure that has a mechanism that can hold and align
This is a minute condition.

The present invention has been made to solve the above-mentioned problems, and can cope with a difference in the thickness or inner diameter of a disc such as a CD or a DVD having a different substrate thickness.
It is an object of the present invention to provide a disk holding device that can be securely mounted and rotated stably, and that can be reduced in size and thickness with a simple mechanism.

[0017]

In order to solve the above-mentioned problems, the present invention provides a plurality of claw members, a center hub for accommodating the claw members and engaging with an inner diameter of a disk, and a center hub. And a turntable on which the disk is placed, the elastic member biasing the claw-shaped member radially of the disk, and a turntable for mounting the disk, wherein the claw-shaped member is slid in the radial direction of the disk. It is configured to be movable and rotatable.

[0018]

[0019]

[0020]

The invention described PREFERRED EMBODIMENTS claim 1 of the present invention in claim 2 is inserted through the center hole part of the disk to a disk holding device for holding the disc, engaging the center hole of the disk A plurality of claw-shaped holding means for joining and holding, a first urging means for pressing and pressing the claw-shaped holding means in the radial direction of the disc, and a claw-shaped holding means slidably housed in the radial direction of the disc. A disk adjusting means which has a center supporting means for accommodating the first urging means and an aligning slope portion which abuts a center hole of the disk and aligns the center of the disk, and which is slidably mounted in the disk attaching and detaching direction; Centering means, second biasing means for pressing and biasing the disk aligning means in a direction in which the disk is removed, and rotating disk means for mounting the disk, wherein the disk is coaxial with the rotation axis of the rotating disk means. Alignment means and center When the disc is mounted with the holding means, the claw-shaped holding means retreats in the inner peripheral direction of the center support means to facilitate the insertion of the disc, and the center hole of the disc is provided on the centering slope of the disc centering means. When the claw-shaped holding means presses the center hole of the disc by the pressing force of the first urging means, aligns the disc, holds the disc, and removes the disc,
The force for lifting the disk causes the claw-shaped holding means to rotate in the disk ejection direction to facilitate the removal of the disk.
The disk holding means is characterized in that the claw-shaped holding means has a shape having a slope portion tapering toward a tip portion in an outer peripheral direction thereof, and a tip ball portion having a tip formed following the slope and a lower portion formed in a spherical shape. Device.

According to the present invention, the disk is held by the claw-shaped portion.
This is made rotatable and slidable using a material,
Depending on the shape of the tip of the claw-shaped holding means,
When you remove the disk with proper
Minimize removal force to minimize disk deformation and distortion.
It can be kept to a minimum.

[0022] The invention according to claim 6 claim 3 of the present invention is inserted through the center hole part of the disk to a disk holding device for holding the disc, engaging and holding the center hole portion of the disk A plurality of claw-shaped holding means, a slope portion tapering toward a tip portion in an outer peripheral direction thereof, and a claw-shaped holding device having a tip ball portion in which a tip and a lower portion following the slope portion are formed in a spherical shape, First urging means for urging the claw-shaped holding means in the radial direction of the disk, and center support for accommodating the claw-shaped holding means slidably in the radial direction of the disc and accommodating the first urging means Means, a disk aligning means having an aligning slope portion abutting on a center hole of the disk and aligning the center of the disk, and a disk aligning means arranged to be slidable in the mounting and removing direction of the disk, and removing the disk from the disk aligning means One And second biasing means for pressing biased in,
A rotating disk means for mounting the disk, wherein the disk aligning means and the center supporting means are arranged coaxially with the rotation axis of the rotating disk means, and when the disk is mounted, the claw-shaped holding means is the center supporting means. To facilitate the insertion of the disc, to bring the center hole of the disc into contact with the centering slope of the disc centering means, and to press the urging force of the first urging means to hold the claw-shaped holding means. When the disc is ejected by pressing the center hole of the disc and holding the disc and ejecting the disc, the claw-shaped holding means rotates in the disc ejection direction by the lifting force of the disc, making it easier to eject the disc. The disk holding device is characterized in that:

In particular, the first biasing means according to claim 4 is a compression spring which is bridged between the center support means and the claw-shaped holding means and is housed in the center support means.
The disk holding device according to claim 3 , wherein the first urging means according to claim 5 is an annular elastic body having a substantially circular cross section disposed on an inner peripheral portion of the center support means.

Further, it said the second biasing means according to claim 6 presses urging the disk centering means rotating disc means as a support point, a conical coil spring wound in a conical shape The disk holding device according to claim 3 .

According to the present invention, the disk is held by the claw-shaped portion.
This is made rotatable and slidable using a material,
By specifying the shape of the tip of the claw-shaped holding means,
Disk holding device
When removing the disc, keep the removal force
Shape and distortion can be minimized. In particular,
The first urging means can be configured to be small and thin.
Wear. In addition, the rocket is uniformly distributed by the second urging means.
Lift the ring to center the disc
And the effect of the thickness of the spring diameter when pressed
Can be eliminated.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. Embodiment 1 FIG. 1 is a cross-sectional view of a disk holding device according to Embodiment 1 of the present invention, and a cross-sectional view of the disk holding device before mounting a disk is shown on the left side of the center of a center spindle shaft 24. The right side of the center of the spindle shaft 24 is a sectional view of the disc holding device after the disc is mounted. FIG. 2 is a plan view of the disk holding device according to the first embodiment of the present invention. On the turntable unit 36, a disk aligning mechanism 31 for aligning the disk 23 is arranged below the disk holding mechanism 30 for self-holding the disk 23, and these two types of mechanisms are integrally configured. Structure. The drive unit 40 is shown in FIG. 1 as a circumferential facing type, but even if this is a surface facing type,
It can be handled without any problem. Therefore, the details of the driving unit 40 are the same as those of the conventional example, and thus the description is omitted.

The disk centering mechanism 31 is composed of a rocket ring 28 and a return coil spring 29. As shown in FIG. 1, the rocket ring 28 is located below the center hub 25. The rocket ring 28 is movable in a direction perpendicular to the disk surface. Further, by embedding the return coil spring 29 in the rocket ring 28, the rocket ring 28 is always urged in the direction of pushing up the disk 23, and
The position is regulated by the center hub 25 which engages with the inner diameter of No. 3. Since the urging force of the disc centering mechanism 31 is regulated by the center hub 25, a member such as a C ring for regulation, which is conventionally required, becomes unnecessary.

Therefore, the disk centering mechanism 31 of the present invention has a simple structure, the manufacturing process is simplified, and the cost can be reduced. Rocket ring 28 is disk 2
3 has an inclined portion 28a that engages with the inner diameter. Disc 2
Even if there is a variation in the inner diameter of No. 3, the inclined portion 28a can absorb the variation in the inner diameter. The inner diameter of the disk 23 is engaged with the inclined portion 28a and also with a claw-like member 26 described later. As a result, the disk 23
Is aligned and held on the turntable.

As shown in FIGS. 1 and 2, the disk holding mechanism 30 has a structure in which the claw members 26 are arranged at, for example, three places at 120 degrees along the outer periphery of the center hub 25. The claw member 26 has bosses 26a on both sides. The boss 26a of the claw member 26 is engaged with a guide groove (not shown) provided in the center hub 25,
A claw member 26 is supported by the center hub 25 so as to be slidable in the radial direction of the disk 23. The claw member 26 is engaged with one end of an elastic member 27 accommodated in the center hub 25, and receives the pressing of the elastic member 27 while the center hub window 2 is being pressed.
It is regulated near 5a. This regulation is performed when the boss 26a of the claw member 26 hits an end of a guide groove (not shown) of the center hub 25. As the claw member 26, for example, a deformed ball flattened into a claw shape made of resin is applied. The other end surface of the elastic member 27 is the center hub boss 25.
It is fixed to the center hub 25 by b. Elastic member 27
For example, a compression spring or the like can be applied. Further, a space 35 is provided in a part of the turntable below the three elastic members 27 so that the elastic members 27 can bend. Since the elastic member 27 can bend downward,
The claw member 26 provided at one end of the elastic member 27 is
It is possible to rotate upward about the center 6a. That is,
The claw member is housed in the center hub 25 and the optical disk 2
3 is slidable and rotatable in the radial direction.
With this configuration, the thickness of the disk holding mechanism can be reduced, and the force required for removing the optical disk 23 can be reduced.

The turntable projection 21a is press-fitted at the inner diameter of the center hub 25 having these disk holding mechanisms. Further, in the range of a radius of 12 to 14 mm on the outer peripheral portion of the turntable 21, the slip sheet 22 to which the sliding friction torque of the disk 23 is appropriately given is provided.
Is affixed. Here, the simultaneous layout structure of the disk holding mechanism 30 and the disk alignment mechanism 31 of the present invention is shown in FIG. 3 before the disk 23 is mounted. FIG. 4 shows a state where the disk 23 is mounted. The operation of the claw member 26 when the disc 23 is attached and detached will be described in detail with reference to FIG. Therefore, in FIG. 5, the shape of the disk alignment mechanism 31 is omitted. Therefore, when mounting the disc 23, the claw-like members 26 located at least at three positions are required.
First, while being pressed by the inner diameter portion of the disk 23, the elastic member 27 that is applying pressure is slid and compressed. The claw-like member 26 has a structure (not shown) hidden near the center hub window 25a, but the receiving surface of the disk 23 approaches the surface of the slip sheet 22 and the inner diameter of the disk 23 is set to the rocket ring 28 of the disk centering mechanism 31. When the disk 23 approaches the tapered portion, the turntable unit 36 satisfies the simultaneous functions of the so-called disk holding mechanism 30 and the disk centering mechanism 31 that perform centering and self-holding of the disk 23. Will be. When the disc 23 is removed, the turntable 21 is turned so that the elastic member 27 is pressed from the boss of the center hub 25 and the claw member 26 and the claw member 26 can rotate.
The elastic member 27 bends in the space 35 of the
3 can be removed, so that an unreasonable load is not applied to the disk 23.

(Embodiment 2) Next, a method for holding a disk while rotating a claw member 26 in a disk holding mechanism will be described with reference to FIGS. 6 and 7. FIG.

FIG. 6 is a sectional view of the disk holding device according to the second embodiment of the present invention, and FIG. 7 is a plan view of the disk holding device according to the second embodiment of the present invention.
On the turntable unit 36, a disk alignment mechanism 31 for aligning the disk 23 is disposed below the disk holding mechanism 30 for holding the disk 23 by itself.
A simultaneous layout structure having various kinds of mechanisms is adopted. As shown in FIG. 1, the disc centering mechanism 31 is located below the center hub 25 and is always biased upward before mounting the disc 23 while embedding the return coil spring 29 in the rocket ring 28. And the center hub 25 controls the position. As shown in FIGS. 6 and 7, the disk holding mechanism 30 has a structure in which the disk holding mechanism 30 is disposed at, for example, three places every 120 degrees. The structure is restricted near 25a, and the opposite end face of the O-ring 32 is restricted by an O-ring stopper 33. In addition, the initial posture of the claw member 26 is in a state of being inclined forward, and the O-ring 32 is surrounded by the center hub 25 and the O-ring stopper 33. Further, the turntable convex portion 21a is formed by the inner diameter portion of the center hub 25 having these disk holding mechanisms.
And press-fit. Further, a slip sheet 22 for appropriately applying the sliding friction torque of the disk 23 is affixed to the outer periphery of the turntable 21 in a radius of 12 to 14 mm. By adopting such a configuration, when the disc 23 is mounted, at least 3
The claw-like members 26 positioned at the first place
The compression is applied while rotating the O-ring 32 which is being pressed by the inner diameter of the O-ring 32. The claw-like member 26 has a structure (not shown) hidden near the center hub window 25a, but the receiving surface of the disk 23 approaches the surface of the slip sheet 22 and the inner diameter of the disk 23 is
When the disk 23 approaches the tapered portion of the rocket ring 28, the disk 23 aligns, and the simultaneous function of the so-called disk holding mechanism 30 and the disk aligning mechanism 31 for self-holding is performed by one turntable unit 36. Will be satisfied.

[0033]

According to the present invention, a disk holding mechanism and a disk centering device are provided so that one spindle motor unit can simultaneously hold and align all types of optical disks including optical disks having different substrate thicknesses. By disposing the mechanism integrally with the turntable unit and mounting the mechanism in the spindle motor unit, the disk can be rotated more accurately without bias and horizontally. As a result, when viewed as a drive device, it is possible to realize stabilization of a reproduction signal and a servo signal, and it is possible to cope with all kinds of optical disks as described above by adding a small number of mechanical components.

Further, a thin disk holding device in which the disk holding mechanism and the disk centering mechanism are integrated can be configured to be thin.

[Brief description of the drawings]

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

FIG. 2 is a plan view of the disk holding device according to the first embodiment of the present invention.

FIG. 3 is a detailed view of a disc holding mechanism and a disc centering mechanism before a disc is inserted.

FIG. 4 is a detailed view of a disk holding mechanism and a disk alignment mechanism after a disk is inserted.

FIG. 5 is a detailed operation diagram of the disk holding mechanism when the disk is attached / detached according to the first embodiment of the present invention.

FIG. 6 is a sectional view of a disk holding device according to a second embodiment of the present invention.

FIG. 7 is a plan view of a disk holding device according to a second embodiment of the present invention.

FIG. 8 shows the configuration of a conventional self-holding type disk holding device.
Figure

FIG. 9 is a diagram illustrating the operation of the disk holding mechanism of FIG . 8;

FIG. 10 shows the structure of a conventional clamp-type disk holding device.
Drawing

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 21 Turntable 21a Turntable convex part 22 Slip sheet 23 Disk 23a Disk receiving surface 24 Spindle shaft 25 Center hub 25a Center hub window 25b Center hub boss 26 Claw member 26a Boss on both sides of claw member 26b R of claw member Part (taper part) 27 Elastic member 28 Rocket ring 28a Inclined part 29 Return coil spring 30 Disk holding mechanism part 31 Disk aligning mechanism part 32 O ring 33 O ring stopper 34 Spindle motor (SPM) 35 Space part for rotating elastic member 36 Turntable unit 37 Rotor yoke 38 Magnet 39 Coil 40 Drive unit 41 Bearing metal unit 42 Back yoke 43 C ring 44 Magnet clamper 45 Center boss 46 Thrust receiver 47 Hall element 48 FPC

────────────────────────────────────────────────── ─── Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) G11B 17/022-17/035

Claims (6)

(57) [Claims] 1. A disk holding device for holding a disk by inserting it into a center hole of a disk, comprising: a plurality of claw-shaped holding means for engaging and holding the center hole of the disk; First biasing means for pressing and biasing in the radial direction of the disk, center support means for accommodating the claw-like holding means slidably in the radial direction of the disk, and for receiving the first biasing means; A disc centering means having a centering slope portion for contacting the center hole of the disc and aligning the center of the disc, and a disc centering means slidably disposed in a disc attaching / detaching direction, and pressing the disc centering means in a direction for removing the disc. A second urging means for urging, and a rotating disk means for mounting a disk, wherein the disk centering means and the center support means are arranged coaxially with a rotation axis of the rotating disk means, This When mounting, the claw-shaped holding means is retracted in the inner circumferential direction of the center support means to facilitate insertion of the disc, and a center hole of the disc is brought into contact with the centering slope of the disc centering means. When the first urging means presses the disc, the claw-shaped holding means presses the center hole of the disc to align the disc and hold the disc. A disk holding device wherein the claw-shaped holding means rotates in a disk discharging direction to facilitate removal of the disk. 2. The claw-shaped holding means has a slope portion tapering toward a tip portion in an outer peripheral direction thereof, and a tip ball portion having a tip and a lower portion formed in a spherical shape at a tip and a lower portion following the slope portion. 2. The disk holding device according to claim 1, wherein: 3. A disk holding device for holding a disk by inserting the disk into a center hole of the disk, comprising a plurality of claw-shaped holding means for engaging and holding the center hole of the disk. A claw-shaped holding means having a slope portion tapering toward the tip portion, a tip ball portion having a tip and a lower portion formed in a spherical shape following the slope portion, and pressing the claw-shaped holding means in a radial direction of the disc; First biasing means for biasing, center support means for accommodating the claw-shaped holding means slidably in the radial direction of the disk and accommodating the first biasing means, and contacting the center hole of the disk. A disk aligning means having an aligning slope portion for aligning the center of the disk and slidably disposed in a disk attaching / detaching direction, and a second biasing means for urging the disk aligning means in a direction of removing the disk; Group A step, and rotating disk means for mounting a disk, wherein the disk aligning means and the center supporting means are arranged coaxially with a rotation axis of the rotating disk means, and the claw-like shape is provided when a disk is mounted. The holding means retreats in the inner circumferential direction of the center support means to facilitate the insertion of the disk, and the centering portion of the disk is brought into contact with the centering slope portion of the disk aligning means, and the first urging is performed. When the pressing force of the means presses the disc-shaped holding means to press the center hole of the disc to align the disc and hold the disc, and when the disc is removed, the force for lifting the disc causes the claw-shaped holding means to press the disc. A disc holding device, characterized in that the disc is rotated in a discharge direction to facilitate removal of the disc. 4. The method according to claim 1, wherein said first biasing means is a compression spring which is bridged between said center support means and said claw-shaped holding means and housed in said center support means.
The disk holding device according to claim 3 . Wherein said first the biasing means and the central support disk holding device according to claim 3, characterized in that substantially a ring-like elastic member having a circular cross section disposed on the inner peripheral portion of the unit. Wherein said second biasing means, said rotary disk means said disc centering means is pressed and urged as a supporting point,
The disk holding device according to claim 3 , wherein the disk holding device is a conical coil spring wound in a conical shape.