JP2001052401A - Disk aligning device and disk driving motor equipped with the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a disk aligning device capable of aligning a disk without needing any large area for the deformation of a lug piece in the radial direction of a turntable, and a disk driving motor equipped with the same. SOLUTION: This disk driving motor is constructed in such a manner that a disk 22 having a center hole 33 is loaded on a turntable 24 fixed to a rotary shaft rotatably driven by a motor main body 23. An aligning device 20 includes plural lug pieces 35 integrally formed with intervals in the peripheral direction of the turntable 24 and made of flexible and elastic materials. The lug pieces 35 are connected serially by being protruded in the axial direction of the turntable 24, each has an extended part 39 bent roughly in a circular-arc shape and extended outward in the radial direction, and a lug main body part 41 connected to the extended part 39 and extended in the axial direction of the turntable 24, and the lug main body part 41 is abutted on the peripheral edge ort 24 of the disk 22.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a disk centering device for mounting a replaceable disk on a turntable so that the axes thereof are aligned with each other, and a disk drive motor provided with the same.

Exchangeable disks are, for example, a compact disk (CD) including a compact disk read only memory (CD-ROM) and a digital video disk (DVD), such as a magneto-optical disk other than those exemplified above. including.

[0003]

2. Description of the Related Art A disk drive motor for driving the above-mentioned replaceable disk such as a CD-ROM is provided with a disk drive motor for aligning the axis of the disk with the turntable, in other words, for centering. A heart device is provided. There are various types of disk alignment devices, such as a device in which a claw piece 5 is provided on a turntable 3 as shown in FIG. This device is disclosed in JP-A-7-282506.

A turntable 3 on which a disk 2 is mounted is coaxially fixed to a rotating shaft 1 driven by a motor body (not shown). The disk 2 is mounted on the mounting portion 4 of the turntable 3, and is chucked with the chucking member (not shown) sandwiching the disk from above and fixed to the turntable 3. In this state, if the axis of the disk 2 does not match the axis of the turntable, in other words, if it is eccentric, the axis of the disk is eccentric from the axis of the rotating shaft, so the weight balance is lost and the disk 2 is Unable to rotate correctly and stably,
The reading means for reading data may not be able to read data recorded on the disk 2 in some cases. Therefore, a disc centering device is provided to position and fix the disc 2 at a predetermined position where the axis coincides with the turntable 3.

[0005] The centering device for a disk is a turntable 3
And three claw pieces 5 provided at intervals in the circumferential direction. Each claw piece 5 has a base end 6 connected to the turntable 3 and extends radially inward. Each claw piece 5 can be resiliently deformed, and an inclined surface 8 that is directed upward in the radial direction is formed at the distal end portion 7. When the disc 2 is placed on the turntable 3,
If the disk 2 is eccentric with respect to the rotation shaft 1, the peripheral edge 9 facing the center hole of the disk 2 comes into contact with the inclined surface 8 of each claw 5 and each claw 5 is deformed unevenly downward. The disk 2 is displaced in the radial direction by the elastic recovery force caused by the uneven deformation of each claw piece 5, and the disk 2 is moved relative to the turntable 3 so that the axis of the disk 2 matches the axis of the turntable 3. Be aligned.

[0006]

In such a conventional technique, each claw piece 5 extends from the outside in the radial direction to the inside in the radial direction, and the base 6 of each claw piece 5 extends in the radial direction of the turntable 4. It is located at a position closer to the outside. In this configuration, each nail piece 5
Is deformed in the axial direction of the turntable 3 and, in the radial direction, a large area from the base end 6 to the front end 7 of each claw piece 5, and not only on the inner side but also on the outer side of the center hole of the disk. A large area including the space is necessary as a space for each of the nail pieces 5 to be deformed. Therefore turntable 3
The other members arranged below are provided in a large area in the radial direction so as to secure a space for each claw piece 5 to be deformed and arranged to be spaced downward from the turntable 3. In addition, there is a problem that the axial dimension of the disk drive motor is increased. If the size of the disk drive motor in the axial direction is restricted due to miniaturization, the above space cannot be ensured, which affects the peripheral configuration, such as reducing the size of the motor drive magnet and stator.

In particular, in a disk drive motor for rotationally driving a CD-ROM, an auto balancer device for correcting a weight balance during rotation may be provided in accordance with an increase in speed exceeding, for example, 50 times speed. Is more difficult to secure. Therefore, if the size of the disk drive motor is increased in the axial direction to abandon miniaturization, or if an auto balancer device is provided, the size of the auto balancer device must be reduced by lowering the accuracy of balance correction at the expense of accuracy. There is a problem.

An object of the present invention is to provide a disk centering device capable of centering a disk in the radial direction of a turntable without requiring a large space for deformation of a claw, and a disk provided with the same. It is to provide a drive motor.

[0009]

According to a first aspect of the present invention, a turntable on which a disk having a central hole is mounted is integrally formed at intervals in a circumferential direction so as to be flexible and resilient. And a plurality of claw pieces for pressing a peripheral portion facing the center hole of the disk in a radially outward direction.Each of the claw pieces protrudes from the turntable in the axial direction thereof and is continuous with the turntable. An extending portion that is curved in an arc shape and extends radially outward of the turntable; and a claw that extends in the axial direction of the turntable following the distal end portion of the extending portion and abuts on a peripheral portion facing the center hole of the disk. A disk centering device comprising a main body.

According to the present invention, each claw piece is formed integrally with the turntable, and has a claw main body extending further in the axial direction from the extending portion extending outward in the radial direction. In addition, that each claw piece is formed integrally with the turntable,
It is formed by a single member. If the disc is eccentric with respect to the turntable, each claw body of each claw piece is deformed unevenly, and the elastic recovery force presses the peripheral edge facing the center hole of the disc, and places the disc on the turntable. Align with you. Each nail piece that aligns the disk in this way is located near the center of the turntable,
As a region for the deformation, in the radial direction, a large region including a region radially outward from the center hole of the disk is not required unlike the above-described conventional technique, and other regions are provided near the outer periphery of the turntable. A region for providing the member can be secured.

In the disk aligning apparatus, the disk is displaced and aligned by the elastic recovery force of the claw which is deformed when the disk is eccentric as described above. Unless an appropriate load is applied to the claws from the disc, the claws do not deform, so that the disc is not properly aligned and is not placed at a predetermined position. Also, in order to obtain a sufficient load to deform the nail pieces, for example, to increase the chucking force of the chucking member pressing the upper surface of the disk, and to apply a large load to the disk,
A large force is required to release the chucking member, which may make it difficult to remove the disk. In order to solve such a problem, it is preferable that each claw piece is configured to be deformed by a small load, and this can be achieved in the present invention.

More specifically, each claw piece is likely to be deformed if the distance from the base end portion connected to the turntable to the abutting portion that abuts on the disk increases, and in the present invention, each claw piece is An extension that projects to the turntable in the axial direction, curves in a substantially semicircular shape, and extends outward in the radial direction of the turntable, and extends to the tip of the extension to extend in the axial direction of the turntable. Extending from the base end portion to the contact portion, and having a claw body portion that abuts on a peripheral portion facing the center hole of the disk,
Thereby, each claw piece can be deformed even with a small load. As described above, even if the distance from the base end portion to the contact portion of each claw piece is increased, no area is required near the outer periphery of the turntable in the radial direction, and each claw piece is easily deformed as described above. Design is easy.

Further, by bending the extending portion, even when each claw piece is deformed, concentration of the stress is prevented, and high durability can be obtained. Further, by forming each claw piece integrally with the turntable, compared to a case where each claw piece is formed separately and mounted on the turntable, no mounting work is required, manufacturing is easy, and mounting is easy. There is no variation in alignment accuracy due to variation in accuracy.

According to a second aspect of the present invention, each of the nail pieces is
It protrudes downward from the axial direction of the turntable and is connected to it.
An extension portion which is bent in a substantially semi-arc shape and extends outward in the radial direction of the turntable; and a peripheral portion which extends upward in the axial direction of the turntable so as to be continuous with a tip portion of the extension portion and faces the center hole of the disk. And a claw main body that comes into contact with the claw body.

According to the present invention, the claw piece is connected to the turntable so as to protrude downward in the axial direction of the turntable, and is extended in a substantially semicircular arc shape and extends outward in the radial direction of the turntable. A claw body that extends upward in the axial direction of the turntable so as to be continuous with the distal end of the protrusion and that abuts on a peripheral edge facing the center hole of the disk; As a result, the claw pieces can be provided so as to be positioned as low as possible, and the amount of protrusion upward can be reduced.

According to a third aspect of the present invention, each of the nail pieces is
It is connected to the turntable by projecting upward in the axial direction,
An extending portion that is bent in a substantially semi-arc shape and extends outward in the radial direction of the turntable; and a peripheral portion that extends downward in the axial direction of the turntable so as to be continuous with a distal end portion of the extending portion and faces the center hole of the disk And a claw main body that comes into contact with the claw body.

According to the present invention, the claw piece is connected to the turntable so as to protrude upward in the axial direction thereof, is curved in a substantially semicircular shape, and extends outward in the radial direction of the turntable. A claw body that extends downward in the axial direction of the turntable following the tip of the protrusion and abuts against a peripheral portion facing the center hole of the disc; As a result, the claw pieces are prevented from being opened upward, and dust and the like can be hardly accumulated.

According to a fourth aspect of the present invention, in each of the nail pieces,
A spring means for applying a spring force directed radially outward is provided.

According to the present invention, a spring means for applying a spring force outward in the radial direction to the above-mentioned claw piece to compensate for the loss of flexibility and elasticity of the claw piece. Is provided. As a result, even if the elastic recovery force of each claw piece due to the creep phenomenon or aging decreases, the same operation and its effect can be maintained by the spring means.

According to a fifth aspect of the present invention, there is provided a disk aligning apparatus comprising the above-described disk aligning apparatus, and further comprising a motor body for driving a turntable of the disk aligning apparatus. A disk drive motor comprising:

According to the present invention, a motor main body for driving the turntable to rotate is included. For example, a turntable in the disk centering device is fixed to a rotating shaft which is rotated by a motor body for driving the turntable. By doing so, the turntable is driven to rotate while the disk is centered on the turntable as described above, and the disk can be driven to rotate correctly and stably.

Each of the pawls for centering the disk is located near the center of the turntable, and as a region for its deformation, is radially larger than the center hole of the disk in the radial direction as in the above-described conventional technique. It does not require a large area including the area on the outer side in the direction, near the outer periphery of the turntable,
A region for providing another member can be secured without being limited by a large space. Therefore,
For example, it is possible to provide an auto-balancing device with high balance correction accuracy without increasing the size of the entire disk drive motor.

[0023]

FIG. 1 is a sectional view showing a disk drive motor 21 provided with a disk centering device 20 according to an embodiment of the present invention. The disk drive motor (hereinafter, may be simply referred to as “motor”) 21 is a motor for rotationally driving a replaceable disk 22 which is, for example, a CD-ROM. Replaceable disc 22
Means other CDs and DVDs in place of the CD-ROM
May be used, or another type such as a magneto-optical disk. The motor 21 includes a motor main body 23, a turntable 24, and a disc centering device (hereinafter may be simply referred to as “centering device”) 20.

The motor main body 23 includes, for example, a stator 25 fixed to a body 24 of a driving device provided with the motor 21.
And a rotor 2 rotatably provided with respect to the stator 25.
6), and drives the rotation shaft 28 to rotate. Stator 25
Includes a coil 50, and a rotor 26 includes a permanent magnet piece 51.
including. The rotating shaft 28 is rotatably supported around a vertical axis L1 by bearing means 27 held by the stator 25, and the rotor 26 is fixed to the rotating shaft 28. When the coil of the stator 25 is excited, the rotor 26 is rotated with respect to the stator 25, thereby
Is driven to rotate.

The turntable 24 is substantially disk-shaped, and is fixed to the rotary shaft 28 coaxially with the rotary shaft 28 above the motor body 23. That is, the turntable 24 is fixed to a structure including the rotor 26 and the rotating shaft 28 which are the rotating bodies of the motor 21. The turntable 24 is made of, for example, a synthetic resin such as polycarbonate and polyimide, and has a substantially flat outer mounting portion 30, and an inner central protruding central portion protruding to both sides in the axial direction with respect to the mounting portion 30. And a part 31. An annular rubber sheet 30 a is attached to the outer peripheral edge of the upper surface of the
2 to prevent slippage. The disc-shaped disk 22 has a coaxial central hole 33 formed at the center thereof.
The disc 22 is placed on the turntable 24 in a state where the central convex portion 31 is inserted through the support portion 30 and is supported by the placing portion 30.

The aligning device 20 is formed integrally with the turntable 24 at equal intervals in the circumferential direction, and has a plurality of claws for pressing a peripheral edge 34 facing the central hole 33 of the disk 22 outward in the radial direction. Includes a piece 35. Each claw piece 35 is made of a flexible and resilient material such as the turntable 24.
It is made of a synthetic resin such as polycarbonate and polyimide, which is the same material as the above, and is integrally formed with the turntable 24 using such a synthetic resin. Each nail piece 35,
For example, three are provided, but four or more may be provided.

FIG. 2 is an enlarged sectional view showing the vicinity of the claw piece 35. In the turntable 24, a plurality of through-holes 36 are formed at equal intervals in the circumferential direction in a region continuous with the central convex portion 31 of the mounting portion 30. The through hole 36 is a nail piece 3
Each claw piece 35 is provided so as to be formed in the same number as the number of the provided 5 and partially fitted in each through hole 36.
Each claw piece 35 is connected to a lower end portion 38 of the outermost peripheral portion of the central convex portion 31 of the turntable 24 so as to protrude downward in the axial direction of the turntable 24, and is curved in a substantially semi-arc shape to form the turntable 24. Extension 39 extending radially outward
And a claw body 41 extending upward in the axial direction of the turntable 24 following the distal end portion 40 of the extension portion 39 and abutting on the peripheral portion 34 facing the central hole 33 of the disk 22.

The claw body 41 is generally linear, and is positioned slightly below the upper end 42 of the outermost periphery of the turntable 31 through the through hole 36 from the extension 39. Extending to Further, the claw main body 41 has a surface 45 on the radially outward side in a natural state where no external force is applied.
Is disposed on a virtual cylindrical surface coaxial with the axis of the turntable 24 having a radius equal to the radius of the inner peripheral surface of the central hole 33 of the disk 22 (coincident with the axis L1), or It is formed so as to be disposed radially outward. Also, at the upper end portion which is the tip portion of the claw main body portion 41,
Guide surface 46 that faces radially inward as going upward
Is formed. In other words, the diameter of each guide surface 46 increases toward the lower side, which is the mounting direction of the disk 22, so that the peripheral portion 34 of the disk 22 is easily guided by each claw 35.

Referring again to FIG. 1, the turntable 24
An annular recess 47 is formed in the central convex portion 31 and opens upward coaxially with the axis of the turntable 24. The recess 47 is fitted into the recess 47 to insert a permanent magnet piece 48 and a yoke 49 made of a magnetic material. Is provided. The chucking member 53 is
Above the turntable 24, it is provided on the body 24 of the driving device so as to be vertically displaceable. Chucking member 53
Has a generally disk-like shape in which a central portion is depressed upward, and is made of a ferromagnetic material. The disc 22 includes a chucking member 53.
Is magnetically attracted downward by the permanent magnet pieces 48, and is chucked by being sandwiched between the mounting portion 30 of the turntable 24 and the chucking member 53, and is fixed while being mounted on the turntable 24. You. In a state where the disk 22 is mounted and fixed on the turntable 24 in this manner, the turntable 24 is driven to rotate by the motor main body 23 via the rotary shaft 28, and the disk 22 mounted on the turntable 24 is rotated. Can be driven.

The motor 21 includes a motor body 23,
An auto balancer device 55 is provided between the turntable 24 and the turntable 24. The auto balancer device 55 includes a rotating shaft 2
8 is fixed to the container 5 and an annular accommodation space 56 is formed.
7 and a moving body 58 accommodated in the accommodation space 56 so as to be displaceable in the radial direction and the circumferential direction with respect to the container 57.
The accommodation space 56 is formed below the vicinity of the outer periphery of the turntable 24. The moving bodies 58 have, for example, a spherical shape and are free to roll, and are accommodated in such a number that they occupy about a semicircle in the circumferential direction of the accommodation space 56. By providing such an auto balancer device 55, when the disk 22 is driven to rotate at a high speed, for example, at a speed at which data can be read at a reading speed exceeding 50 times speed in the case of a CD-ROM, the moving body 58 By displacing with respect to 57, it is possible to correct the collapse of the weight balance during rotation of the motor 21. Therefore, the disk 22
Can be rotated stably.

If the disk 22 is eccentric with respect to the turntable 24 while being fixed to the turntable 24 in this manner, the disk 22 cannot be rotated accurately and stably, and data recorded on the disk 22 cannot be obtained. Malfunctions, such as the inability to read the information. In order to prevent this problem, an aligning device 20 is provided for aligning the axes when the disk 22 is placed on the turntable 24, that is, for aligning.

When the disk 22 is placed on the turntable 24, if the disk 22 is eccentric with respect to the turntable 24, each claw 35 is deformed unevenly.
More specifically, the surface 45 of the nail piece 35 is
When the disc 22 is placed on the placing portion 30, the claw 35 is not deformed, but the claw 35 35
When the surface 45 of the disk 22 is located more radially than the inner peripheral surface of the peripheral portion 24 of the disk 22, for example, the disk 22 is pressed by the chucking member 53 from a state shown by a virtual line 60 in FIG. When the disk 22 is displaced downward, the peripheral portion 24 of the disk 22
After this, the guide surface 46 guides the peripheral portion 24, and conversely, the claw 35 is deformed radially inward as indicated by the imaginary line 61. Further, the amount of deformation of the claw piece 35 varies depending on the amount of eccentricity of the disk 22. Therefore, when the disk 22 is eccentric, each of the claw pieces 35 is in a state where some of the claw pieces 35 are deformed inward in the radial direction and the remaining claw pieces 35 are not deformed, or all the claw pieces 35 are deformed.
Is deformed, there are nail pieces 35 that are deformed with a large deformation amount and nail pieces 35 that are deformed with a small deformation amount. Of course, if only some of the nail pieces 35 are deformed and the number is plural, the deformation amount may be different. When the disk 22 is pressed downward by the chucking member 53 in the state where the disk 22 is eccentric as described above, the claw pieces 35 corresponding to the eccentric upstream portion of the peripheral portion 34 of the disk 22 34 is deformed radially inward by a larger deformation amount than the claw piece 35 corresponding to the portion on the downstream side in the eccentric direction.

When the nail pieces 35 are deformed non-uniformly in this manner, the elastic recovery force generated on each nail piece 35 naturally differs,
The resultant force of the elastic recovery force of each claw piece 35 acts on the disk 22 in a direction opposite to the eccentric direction, that is, on the disk 22 in a direction where its axis is directed to the axis of the turntable 24. When the disk 22 is coaxial with the turntable 24, the amount of deformation of each claw 35 is uniform or each claw 35 is not deformed, and the resultant elastic recovery force of each claw 35 is zero. Becomes The peripheral portion 34 of the disk 22 is pressed by the elastic recovery force of each of the claw pieces 35 so that the disk 2
2 is centered on the turntable 24. As a result, the disk 22 can be driven to rotate correctly and stably.

Each claw piece 35 for centering the disk 22 is located near the center of the turntable 24, and serves as an area for deformation thereof in the radial direction, as in the above-described conventional technique. A large area including an area radially outward from the hole 33 is not required, and an area for providing other members is provided near the outer periphery of the turntable 24 without sacrificing the size of the peripheral part. Can be. Therefore, it is possible to provide the auto balancer device 55 with high balance correction accuracy without increasing the size of the entire disk drive motor 21.

More specifically, in order to prevent the motor 21 from being enlarged, the outer diameters of the motor body 23, the turntable 24, and the auto balancer device 55 are selected to be substantially the same. It is preferable to dispose the moving body 58 as radially outward as possible so that the balance can be largely corrected, and it is preferable to increase the size of the moving body 58 in order to increase the weight of the moving body 58. By configuring the centering device 20 as described above, the vicinity of the inner periphery of the turntable 24 is
Although a space for providing each claw piece 35 and a space for facilitating the deformation of each claw piece 35 are required below the turntable 24, such a space is not required below the outer periphery, The auto balancer device 55 can be provided close to the turntable 24. As a result, the balance correction accuracy can be maintained high, and the size of the motor 21 can be reduced as much as possible. The inner peripheral portion 80 of the auto balancer device 55 connects the outer peripheral portion 81 in which the moving body 58 is accommodated to the rotating shaft 28,
The thickness in the axial direction can be small, and a space for disposing each claw piece 35 can be secured.

The disk aligning device 20 is provided with a claw 3 which is deformed when the disk 22 is eccentric as described above.
The disk 22 is displaced and aligned by the elastic recovery force of 5, but if a load sufficient to deform the claw 35 is not applied from the disk 22 to each claw 35, each claw 35 is deformed. As a result, the disk 22 is not properly aligned and is not arranged at a predetermined position coaxial with the turntable. In other words, the disk 22 is placed on the claw pieces 35 and is not properly placed on the turntable 24. Also, if a large load is applied to the disk 22 in order to obtain a load sufficient to deform the claw pieces 35, the work of removing the disk 22 may become difficult. More specifically, in order to apply a large load to the disk 22, the chucking member 53 needs to be attracted downward by the permanent magnet piece 48 with a large magnetic attraction force.
When the magnetic attraction force is increased, it is difficult to displace the chucking member 53 upward against the magnetic attraction force when the disk 22 is removed. Therefore, the magnetic attraction force for attracting the chucking member 53 is set small enough to easily displace the chucking member 53 upward. Therefore, each claw piece needs to be deformed by a small load, and this can be achieved in the present invention.

FIG. 3 shows the relationship between the load W on the claw 35 and the amount of deflection δ.
3 (1) is a simplified perspective view showing the claw piece 35, and FIG. 3 (2) is a cross-sectional view showing the claw piece 35 in a simplified manner.

More specifically, when the claw piece is approximated to a cantilever beam, the load applied from the disk 22 to the contact portion 66 is W, and the amount of deflection δ at the point of application of the load W at this time is expressed by the following equation. It is represented by (1).

[0039]

(Equation 1)

Here, L is a distance between the base portion 65 and the contact portion 6.
6, E is the modulus of longitudinal elasticity, and I is the second moment of area. The second moment of area I is
It is expressed by the following equation (2).

[0041]

(Equation 2)

Here, b is the width of the claw in the circumferential direction, and h is the thickness in the thickness direction perpendicular to the length and width of the claw. Further, the load W is obtained from the equations (1) and (2).
Is obtained as in the following equation (3).

[0043]

(Equation 3)

As is apparent from the equation (3), in order to make the claw 35 easily bend so as to bend even with a small load W, in other words, the load W is reduced in a state where a constant amount of bending δ is obtained. To do so, it is only necessary to reduce any of the elastic modulus E, the width b and the thickness h, or to increase the distance L. In particular, since the thickness h and the distance L work as a cube, if the thickness h can be reduced or the distance L can be increased, the load W can be further reduced. Thickness h
It is difficult to reduce the size of the nail pieces 35 in order to prevent the strength of the nail pieces 35 from decreasing. The distance L can be increased by extending the claw body 41 downward.
5, an inner peripheral portion of the auto balancer device 55 is disposed, and the inner peripheral portion can be reduced in axial dimension as described above. It is easy to form a space for extension. Therefore, the claw piece 35 has an extended portion 39 that protrudes and continues in the axial direction to the turntable and has a substantially semicircular arc-shaped bent portion and a claw body portion 41.
The inner peripheral side portion 80 is retracted below the outer peripheral side portion 81 to form a recess 82. In this recess 82,
It is provided so as to protrude below the upper end of a portion 81 on the outer peripheral side of the auto balancer device 55, increases the distance L from the base end portion 65 to the contact portion 66, and applies a small load W to the claw pieces 3.
5 is configured to bend easily. In this way, even if the distance L from the base end portion 65 to the contact portion 41 is increased in order to make each claw piece 35 easily bendable, a region near the outer periphery in the radial direction is not required, and the disk drive motor 21, it is easy to secure a region for providing each nail piece inward in the radial direction as described above,
5 is easy to design. Even in this case, it is not necessary to retreat the auto balancer device 58 downward, so that the size of the entire motor 21 can be prevented.

In particular, as in the present embodiment, each claw piece 35 is projected downward from the lower end portion 38 of the central convex portion 31 to be continuous.
The above-mentioned distance L can be made longer by adopting a configuration that is curved and extends upward. That is, the disk 22
Is placed on the turntable 24 from above, and thus is disposed closer to the upper side of the turntable 24. Therefore, the distance L is more likely to be longer than in the configuration in which the claw pieces 35 are connected to the upper end of the central convex portion 31 and the claw body is extended downward. Moreover, the amount of protrusion of the claw pieces 35 upward can be reduced.

The extended portion 39 is formed in a curved shape, and the claw piece 35 is formed in a portion from the base end portion 65 to a contact portion 66 which is a portion which generates stress when deformed by being pressed by the disk 22. Does not have corners. In other words, the nail piece 35
The outer surface is smoothly connected in the direction in which. In the parts where stress is generated due to deformation, such as bent parts,
If there is a corner, there is a possibility that stress is concentrated on the corner, cracks are generated, or breakage of nail pieces such as causing plastic deformation is caused, but as in the present embodiment, By forming the extended portion 39 to be curved so as not to have a corner at a portion where stress is generated, the concentration of stress causing the above-mentioned problem is prevented, and the occurrence of the crack and the like is prevented. And high durability can be obtained. In addition, if there is a corner, the corner becomes difficult to bend, and the bending causes the centering function of the centering device for aligning the disk 22 to decrease. Is small, the function of bending with a large amount of bending δ is reduced. However, in the configuration having no corner portion as in the present embodiment, the entire portion from the base end portion 65 to the contact portion 66 is reduced. It is possible to bend and be easily bent, so that the centering function exhibited by bending can be enhanced.

When the claw 35 is extended linearly in order to further increase the distance L, the bending moment at the base end portion 65 connected to the central convex portion 31 increases, and the stress at the base end portion 65 increases. However, as in the present embodiment, the distance L along the claw 35 from the base end portion 65 to the contact portion 66 is increased by bending the extension portion 39 by about 180 degrees. Also the proximal part 6
5 can be shortened, and the direction connecting the base end portion 65 and the contact portion 66 and the direction in which the load W acts do not intersect at right angles. The bending moment acting on the portion 65 can be reduced. Naturally, the stress acting on the base end portion 65 can also be reduced, so that the claw pieces 35 are less likely to be damaged.

Further, by forming each claw piece 36 integrally with the turntable 24, compared with a case where each claw piece 35 is formed separately and mounted on the turntable 24, no mounting work is required, and manufacturing is completed. And the alignment accuracy is not varied due to the mounting accuracy.

The tip of the claw body 41 is located at the center convex portion 3.
If the protrusion protrudes from the upper end of the disk 1, the interference disk may not be properly placed on the disk surface or the chucking member, or the claw may be damaged. , And extends in the radial direction so that the claw pieces can be arranged as low as possible. Along with this, the tip of the claw body 41 of the claw piece 35 can be disposed below the upper end of the central convex portion 31, thereby preventing the above-described problem and allowing the disc to be properly mounted and the claw piece to be properly placed. 35 is prevented from being damaged.

The nail main body 41 and the central projection 31 of each nail piece 35
Spring means 70 for applying a spring force in which each claw piece 35 is directed radially outward in the space between
a may be provided. This spring means 70a
May be a helical spring or a leaf spring (shown).

Each of the nail pieces 35 is made of a synthetic resin as described above. When used in a high-humidity environment, there is a possibility that a so-called creep phenomenon may occur due to absorption of moisture and loss of elasticity, or elasticity due to aging. This problem can be prevented by providing the spring means 70a.

FIG. 4 shows a disk drive motor 21A having a disk centering device 20A according to another embodiment of the present invention.
FIG. 5 is a sectional view showing the claw piece 3 of the centering device 20A.
It is sectional drawing which expands and shows 5A vicinity. The centering device 20A and the motor 21A of the present embodiment are similar to the above-described centering device 20 and the motor 21, respectively.
Portions having the same configuration are denoted by the same reference numerals and description thereof is omitted. In the present embodiment, each claw piece 35A is provided at the upper end portion 38A of the outermost peripheral portion of the central convex portion 31 of the turntable 24.
An extending portion 39A which projects upwardly in the axial direction of the turntable 24, and which is curved in a substantially semicircular arc and extends outward in the radial direction of the turntable 24;
And a claw body 41A extending downwardly in the axial direction of the turntable 24 following the tip portion 40A of the turntable 24 and abutting against the peripheral portion 34 facing the central hole 33 of the disk 22.

The claw body 41 is generally linear and extends from the extension 39 to a position where it is inserted into the through hole 36. Further, in the natural state where no external force is applied, the claw main body 41A has an outer surface 45A on the outer side in the deformation direction, the axis of the turntable 24 having a radius equal to the radius of the inner peripheral surface of the central hole 33 of the disk 22 ( It is arranged on a virtual cylindrical surface coaxial with the axis L1), or is formed so as to be located radially outward of the virtual cylindrical surface.
Also, it is the tip of the claw body 41A. The outer surface 46A near the tip portion 40A of the extension 39A is radially inward as it goes upward, in other words, it expands in diameter as it goes downward, which is the mounting direction of the disk 22. This surface 46A functions similarly to the guide surface 46 of the above-described embodiment.

This embodiment has the same configuration as that of the above-described embodiment except that the nail piece 35A is different. In the present embodiment, similarly to the above-described embodiment, on the radially outward side,
Other members and devices, for example, an auto balancer device 55
Space can be secured for providing
The effect of deforming with a small load can be achieved. Also, since the claw piece does not open upward, the claw piece 35A and the central convex portion 3
Dust hardly accumulates between the two. Also in such a form, a similar effect can be achieved by providing the spring means 70a.

Although the embodiments of the present invention have been described above, the present invention is not limited to these embodiments. For example, the disc may be a similar disc such as a DVD other than a CD-ROM. Further, the above-mentioned auto balancer device is not essential to the present invention. Further, the turntable may constitute a part of the rotor of the motor body.

[0056]

As described above, according to the present invention, each claw piece is formed integrally with the turntable, and further extends in the axial direction from the extension portion extending outward in the radial direction, thereby extending the claw body portion. have. In addition, that each claw piece is formed integrally with the turntable means that it is formed by a single member. If the disc is eccentric with respect to the turntable, each claw body of each claw piece is deformed unevenly, and the elastic recovery force presses the peripheral edge facing the center hole of the disc, and places the disc on the turntable. Align with you. Each claw piece for centering the disc in this manner is located near the center of the turntable, and as a region for its deformation, is radially larger than the center hole of the disc in the radial direction as in the conventional technique described above. A large area including the area on the outer side in the direction is not required, and an area for providing another member can be secured near the outer periphery of the turntable.

In the disk centering device, the disk is displaced and aligned by the elastic recovery force of the claw which is deformed when the disk is eccentric as described above. Unless an appropriate load is applied to the claws from the disc, the claws do not deform, so that the disc is not properly aligned and is not placed at a predetermined position. Also, in order to obtain a sufficient load to deform the nail pieces, for example, to increase the chucking force of the chucking member pressing the upper surface of the disk, and to apply a large load to the disk,
A large force is required to release the chucking member, which may make it difficult to remove the disk. In order to solve such a problem, it is preferable that each claw piece is configured to be deformed by a small load, and this can be achieved in the present invention.

More specifically, each claw piece is easily deformed if the distance from the base end portion connected to the turntable to the abutment portion that abuts on the disk increases. In the present invention, each claw piece is An extension that projects to the turntable in the axial direction, curves in a substantially semicircular shape, and extends outward in the radial direction of the turntable, and extends to the tip of the extension to extend in the axial direction of the turntable. Extending from the base end portion to the contact portion, and having a claw body portion that abuts on a peripheral portion facing the center hole of the disk,
Thereby, each claw piece can be deformed even with a small load. As described above, even if the distance from the base end portion to the contact portion of each claw piece is increased, no area is required near the outer periphery of the turntable in the radial direction, and each claw piece is easily deformed as described above. Design is easy.

Further, by bending the extending portion, even when each claw piece is deformed, concentration of the stress is prevented, and high durability can be obtained. Further, by forming each claw piece integrally with the turntable, compared to a case where each claw piece is formed separately and mounted on the turntable, no mounting work is required, manufacturing is easy, and mounting is easy. There is no variation in alignment accuracy due to variation in accuracy.

According to the present invention, the claw piece is connected to the turntable so as to protrude downward in the axial direction of the turntable, curves in a substantially semicircular shape, and extends outward in the radial direction of the turntable. A claw body that extends upward in the axial direction of the turntable so as to be continuous with the distal end of the extension, and that abuts on a peripheral edge facing the center hole of the disk; As a result, the claw pieces can be provided so as to be positioned as low as possible, and the amount of protrusion upward can be reduced.

According to the present invention, the claw piece is connected to the turntable in such a manner as to protrude upward in the axial direction of the turntable, curves in a substantially semicircular arc shape, and extends outward in the radial direction of the turntable. A claw body that extends downward in the axial direction of the turntable following the tip of the protrusion and abuts against a peripheral portion facing the center hole of the disc; As a result, the claw pieces are prevented from being opened upward, and dust and the like can be hardly accumulated.

According to the present invention, a spring means for applying a radially outward spring force to the above-mentioned claw piece to compensate for a loss in flexibility and elasticity of the claw piece. Is provided. As a result, even if the elastic recovery force of each claw piece due to the creep phenomenon or aging decreases, the same operation and its effect can be maintained by the spring means.

According to the present invention, the motor body for driving the turntable to rotate is included. For example, a turntable in the disk centering device is fixed to a rotating shaft which is rotated by a motor body for driving the turntable. By doing so, the turntable is driven to rotate while the disk is centered on the turntable as described above, and the disk can be driven to rotate correctly and stably.

Each of the pawls for centering the disk is located near the center of the turntable, and as a region for deformation thereof, is radially larger than the center hole of the disk as in the above-described conventional technique. It does not require a large area including the area on the outer side in the direction, near the outer periphery of the turntable,
A region for providing another member can be secured without being limited by a large space. Therefore,
For example, it is possible to provide an auto-balancing device with high balance correction accuracy without increasing the size of the entire disk drive motor.

[Brief description of the drawings]

FIG. 1 is a disc centering device 2 according to an embodiment of the present invention.
FIG. 2 is a cross-sectional view showing a disk drive motor 21 provided with a disk drive 0;

FIG. 2 is an enlarged sectional view showing the vicinity of a claw piece 35;

FIG. 3 is a diagram for explaining a relationship between a load W and a deflection amount δ of a claw piece 35;

FIG. 4 is a disc centering device 2 according to an embodiment of the present invention.
It is sectional drawing which shows 21 A of disk drive motors provided with 0A.

FIG. 5 is an enlarged sectional view showing the vicinity of a claw piece 35A.

FIG. 6 is a cross-sectional view showing a conventional centering device.

[Explanation of symbols]

 20, 20A Disk centering device 21, 21A Disk drive motor 22 Disk 23 Motor body 24 Turntable 35, 35A Claw piece 39, 39A Extension 41, 41A Claw main body 53 Chucking member 55 Auto balancer device

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 5D038 BA04 BA05 CA03 5D109 BA02 BA14 BA20 BB12 5H607 AA12 BB01 BB14 BB17 CC01 DD03 EE10 EE38 GG03 JJ08 5H621 HH01 JK19

Claims (5)

[Claims] 1. A turntable on which a disk having a central hole is mounted is integrally formed at intervals in a circumferential direction,
It is made of a flexible and resilient material, and includes a plurality of claw pieces for pressing a peripheral portion facing a central hole of the disk in a radially outward direction. An extension that protrudes and continues, curves in a substantially semicircular shape and extends radially outward of the turntable, and extends in the axial direction of the turntable following the tip of the extension to extend through the center hole of the disk. A centering device for a disk, comprising: a claw main body that abuts on a facing peripheral portion. 2. An extending portion that projects from the turntable in the axial direction downward and extends to the turntable, curves in a substantially semicircular arc shape, and extends outward in the radial direction of the turntable. 2. The disk centering device according to claim 1, further comprising: a claw main body extending upward in the axial direction of the turntable following the tip of the turntable and abutting against a peripheral portion facing a center hole of the disk. 3. An extending portion which is connected to the turntable in such a manner as to protrude upward in the axial direction of the turntable, is curved in a substantially semicircular shape, and extends outward in the radial direction of the turntable. 2. The disk centering device according to claim 1, further comprising: a claw main body extending downward in the axial direction of the turntable following the tip of the turntable and abutting against a peripheral portion facing a center hole of the disk. 4. The disk centering device according to claim 2, wherein each of said pawls is provided with a spring means for applying a spring force toward a radially outward direction. 5. A disk centering device comprising the disk centering device according to claim 1, and a motor main body for driving a turntable of the disk centering device. Disk drive motor with a core device.