JP2002237118A - Motor mounted with disk clamping mechanism - Google Patents

Abstract

PROBLEM TO BE SOLVED: To realize clamping and accurate centering of a disk to cope with downsizing of equipment in a disk clamping mechanism used for a motor. SOLUTION: The motor is provided with a disk holding ring 7, three or more disk clamping pawls 8a, 8b, 8c housed inside of the disk holding ring, elastic springs 9a, 9b, 9c for pressing the disk clamping pawls in the direction of the radius, a shaft 3 for making the disk holding ring rotatable, and a bearing for bearing the shaft, and the disk holding ring 7 is constructed to have at least two or more eccentricity absorbing and correcting projections 13, 14 almost on the opposite side of the disk clamping pawls 8a, 8b, 8c, and the projections are sized to the range of 40 μm±20 μm.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a motor and a disk drive device having a disk clamp mechanism for mounting and fixing a disk such as a compact disk or a video disk for recording and reproducing information on a turntable. And more specifically to its clamping and centering.

[0002]

2. Description of the Related Art In recent years, in a disk drive device for recording and reproducing information on an optical disk or a magneto-optical disk, it is necessary to rotate the disk with an optical pickup facing a recording track or a reproduction track of the disk. . Therefore, the disk drive device mounts the disk at a predetermined position of the motor, and the motor has a disk clamp mechanism including a turntable that is driven to rotate together with the disk by a rotation drive mechanism.

There is also a strong demand for a disk drive and a device for recording and reproducing information on an optical disk, a magneto-optical disk, and the like, which are smaller and thinner. In particular, since the disk drive is required to have the function of clamping the disk with the disk holding ring of the motor itself for mounting on a notebook computer, the disk holding ring itself pushes the disk toward the disk table. Need to support.

[0004] In particular, recently, a disk drive of an optical disk has been represented by a DVD-ROM or a DVD-RAM.
In the VD device, in order to increase the reliability of recording and reproducing information as the track pitch becomes narrower, it is desired that the centering accuracy be improved as compared with the CD-ROM. Therefore, a centering type self-holding clamp mechanism that has a function of clamping a disk with a disk holding ring configured in the motor itself and that can perform a centering function of the disk with high accuracy is naturally desired. Request.

A motor equipped with a conventional disk clamp mechanism will be described with reference to FIGS. 12, 13 and 14. FIG.
FIG. 12 is a structural diagram of a motor equipped with a disk clamp mechanism. FIG. 13 is a plan view of the disk clamp mechanism. First, the disk clamping mechanism of the motor includes a substantially cylindrical disk holding ring 7 for holding the inner diameter portion 15 of the disk 5, a hole inside the disk holding ring 7, and a disk clamp claw 8 provided at that location.
a, 8b, 8c and disc clamp claws 8a, 8b, 8c
Are pressed in the radial direction.

Now, the positioning of the disk clamp mechanism in the motor will be described.

Referring to FIGS. 12 and 13, a rotatable shaft 3 is inserted into a metal 2 attached to a fixed bracket assembly 1.

A turntable 4 made of a pressed product of brass or iron is attached to one end of the shaft 3, and a TT cushion for receiving a disk 5 capable of recording and reproducing information is provided on a plane of the turntable 4. 6 is attached. The turntable 4 has a substantially cylindrical disk holding ring 7 for holding the inner diameter portion 15 of the disk 5.
Is fixed by press-fitting or bonding.

The disk holding ring 7 has a function of positioning the disk 5 in the radial direction. In addition, in order to rotate the rotated disk 5 while pressing it against the TT cushion 6, the disk holding ring 7 has a hole for accommodating the disk clamp claws 8a, 8b, 8c therein. The disk clamp claws 8a, 8b, 8c are pressed in the radial direction by 9a, 9b, 9c.

The disk 5 is pressed against the TT cushion 6 by the disk clamp claws 8a, 8b, 8c pressed radially by the elastic springs 9a, 9b, 9c. Therefore, even if the disk 5 rotates at a high speed, information can be recorded and reproduced on the disk 5 without being lifted from the turntable 4.

FIG. 14 is a plan view when a disk is mounted on the disk clamp mechanism. In FIG. 14, when the disk 5 is inserted into the disk holding ring 7, it is pressed radially outward by the elastic springs 9a, 9b, 9c, so that the disk clamp claws 8a, 8b, 8c are formed.
To a TT cushion (not shown).

The inner diameter of a disk 5 represented by a CD-ROM, a DVD-ROM, etc. ranges from 15.00 mm to 15.15.
The size is defined in the range of mm, and the size varies within the range. In general, in order to accommodate the disk 5 having such an inner diameter, the outer diameter of the disk holding ring 7 has a maximum of 15.00 mm, that is, the disk holding ring 7 has a maximum outer diameter of 15.0 mm.
The size is not more than 00 mm. As described above, a gap is formed between the inner diameter of the disk 5 and the outer diameter of the disk holding ring 7 due to the standard and dimensional tolerances of the components, and the maximum value of the gap is equal to the maximum value of the inner diameter of the disk 5 and the disk holding ring. It is determined by the difference (0.15 mm) between the minimum values of the outer diameter of the ring 7, and the difference is the amount of deflection of the outer diameter of the disk.

As described above, the inner diameter of the disk 5 and the outer diameter of the disk holding ring 7 are different from each other due to the tolerance of the parts, so that when the disk 5 is inserted into the disk holding ring 7, the center of rotation of the shaft rotates with the rotation of the shaft. The disc center DS of the disc 5 is mounted in an eccentric state with respect to RS. The eccentric mounting causes the disk center DS of the disk 5 to be eccentric X1 with respect to the shaft rotation center RS.
It rotates in the state where it did.

In particular, a recent disk drive of an optical disk is a D-ROM such as a DVD-ROM or a DVD-RAM.
In order to increase the reliability of recording and reproduction of information as the track pitch becomes narrower, VD equipment has been required to improve centering accuracy compared to CD-ROM, that is, to reduce whirling after the disk 5 is mounted. I cannot be satisfied.

[0015] In particular, the mounting on a notebook personal computer requires the disk clamp mechanism itself configured on the motor itself.
A function of pressing the disk 5 against a TT cushion (not shown) is required. As described above, in the conventional disk clamp mechanism, the difference between the center of rotation of the shaft and the center of the disk caused by the gap between the disk and the disk holding ring, that is, the reliability of recording and reproduction of information due to the problem that the eccentricity is large is large. And cause an error in information recording and reproduction.

A conventional example of a disk clamp mechanism having a turntable that is driven to rotate together with the disk by a rotary drive mechanism is disclosed in Japanese Patent Application Laid-Open No. 3-15759. The one described in the above publication is described as follows.

That is, a plurality of spherical members movably disposed in the fitting body and urged in the protruding direction by the elastic member abut on the upper edge of the inner portion of the center hole of the disk, and move the disk table. An object of the present invention is to reduce the size and thickness of the disk device by elastically supporting the side with a pressing force.

For this purpose, the disk disclosed in the above-mentioned publication has a disk having a central hole placed thereon, a disk table rotated by a rotary drive mechanism, and a disk table disposed at the center of the disk table. The engaging member and the disk mounted on the disk table are disposed so as to be able to advance and retreat from the engaging member, and are urged in a direction to protrude outward from the engaging member by an elastic member such as an O-ring. A plurality of spherical members for pressing and supporting the disk table; a plurality of through holes for projecting the plurality of spherical members, and a plurality of cut portions are formed in the engagement body. States that at least one elastic displacement portion is provided.

According to the above publication, when the disc is placed on the turntable, the plurality of spherical members protruding and urged outward from the engaging body are formed on the upper edge of the inner portion of the center hole of the disc. The disc is pressed and supported on the turntable side to abut the part, and is mounted and supported on the turntable.

However, according to the disk clamp mechanism described in the above publication, there is a possibility that the centering may vary unless the urging forces of the plurality of spherical members are equal. When a plurality of spherical members are individually urged independently, the urging force of each spherical member tends to vary, and the centering deviation of the disk tends to increase.

In addition, there is a possibility that centering deviation may occur due to variations in composition and dimensions of the elastic member such as an O-ring or the like, a change with time, unevenness in mounting a disk, and other various conditions. Improvement is needed.

Another conventional example is disclosed in Japanese Utility Model Laid-Open No. 5-27846. The one described in the above publication is described as follows.

That is, it is composed of a turntable and an elastic plate, and is radially spaced at 120 degrees from its center.
Extend the arm of the book, bend the arm with a diameter smaller than the inner diameter of the disc so as to spread upward, provide a protrusion beyond the inner diameter of the disk at the tip, further bend the tip of the arm and The disk holding member is mounted on the disk holding member placed on a turntable.

It is another object of the present invention to provide a disk chucking mechanism when the through hole in which the claws of each arm of the disk holding member fits and the disk can be reliably centered, and the thickness of the apparatus can be reduced and the number of parts can be reduced. It has said.

However, a plurality of radial arms, a protruding portion which is bent so as to extend upward from the arm and protrudes beyond the inner diameter of the disk, and a disk holding member which is further bent at its tip to form a claw is provided. If they are not equal, the centering may vary, and the centering deviation of the disk tends to increase.

Further, there is a possibility that the centering may be deviated due to the dimensional variation of the elastic member comprising the disk holding member or the unevenness at the time of mounting, and further improvement of the centering is required for higher precision requirements. .

Further, as another conventional example, Japanese Patent Application Laid-Open No. 11-27
There is one described in JP-A-3203.

The publication described above is described as follows. That is, a turntable on which a disk having a center hole is placed and driven to rotate is provided, and the turntable is integrally formed with the body portion in which the disk center hole fits, and protrudes radially from the outer peripheral surface of the body portion. A first guide portion formed at a distance from the center of the body portion with respect to the first guide portion;
It is provided with second and third guide portions provided so as to be able to advance and retreat in the radial direction at locations separated by a distance, and the second and third guide portions are described as being integrally formed of a metal plate. I have. According to the conventional disk clamp mechanism as described in the above-mentioned publication, it is difficult for the disk to move in a plane parallel to the plane of the disk in the disk chucking state, to prevent the centering from shifting, and to reduce the assembly cost. States that they are aiming.

However, in the invention described in the above publication, the turntable itself does not have a mechanism for elastically pressing and supporting the disk on the disk table side. Using a center hub made of a magnetic material such as an iron plate,
The chucking magnet attracts the center hub to press and support the disk toward the disk table.

For this reason, an expensive chucking magnet and a center hub having a complicated structure are required. Further C
D-ROM, DVD-ROM, DVD-RAM and C
Since a disk such as a DR or a CD-RW does not have a center hub in the disk itself, the disk cannot be pressed and supported on the disk table side. And
In order to press and support the disc on the disc table side, it was necessary to press the disc with another member.

[0031]

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems in a disk clamp mechanism of a motor, that is, a disk drive for recording and reproducing information on an optical disk, a magneto-optical disk, and the like, and a reduction in the size and thickness of equipment. In such a situation, in such a situation, a disk drive of an optical disk is a DVD device represented by a DVD-ROM or a DVD-RAM, etc., in order to improve the reliability of recording and reproducing information due to the narrowing of the track pitch. Demand for improved accuracy of centering technology compared to CD-ROM, and a function of clamping a disk with a disk holding ring provided in the motor itself, and a centering type capable of performing a centering function of a disk. This solves the need for a self-holding clamp mechanism. In addition, it also responds to demands that are high in reliability and economical. It is another object of the present invention to provide a centering-type self-holding clamp mechanism capable of performing an excellent centering function of a disk with high reliability and high accuracy, thereby responding to a demand for downsizing and thinning of a device.

[0032]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides a substantially cylindrical disk holding ring for holding an inner diameter of a recordable and reproducible disk, and a disk holding ring housed inside the disk holding ring. Three or more disc clamp claws, an elastic spring for pressing the disc clamp claws in the radial direction, a shaft for rotating the disc holding ring, and a bearing for supporting the shaft. An eccentricity correcting projection for absorbing at least two or more eccentricities is provided on a substantially opposite side.

Also, the center of the disk holding ring is eccentric to the center of the shaft substantially opposite to the disk clamp pawl.

Further, a substantially cylindrical disk holding ring for holding an inner diameter portion of a disk on which recording and reproduction can be performed, three or more disk clamp claws housed inside the disk holding ring, and a disk clamp claw are provided. An elastic spring that presses in the direction, a shaft that allows the disk holding ring to rotate, and a bearing that supports the shaft, the disk holding ring has one or more elastic members that bias the disk outward, The center of the disk holding ring is configured to be eccentric with respect to the center of the shaft substantially on the side opposite to the elastic member.

[0035]

DESCRIPTION OF THE PREFERRED EMBODIMENTS According to the first aspect of the present invention, a substantially cylindrical disk holding ring for holding an inner diameter portion of a disk on which recording and reproduction can be performed, and a disk holding ring housed inside the disk holding ring. Three or more disk clamp claws, an elastic spring for pressing the disk clamp claws in a radial direction, and a shaft for rotating the disk holding ring,
A motor equipped with a bearing for supporting the shaft, and a disk holding ring having a disk clamping mechanism having an eccentricity correcting projection on at least an opposite side of the disk clamping claw to absorb at least two or more eccentricities; The present invention is expressed by structural features.

As described above, since the eccentricity correction projection for absorbing at least two or more eccentricities is formed on the side substantially opposite to the disk clamp claws, the inner diameter of the disk absorbs the eccentricity when the disk is clamped. Since the disk is in contact with the eccentricity correction projection, the positioning of the disk is facilitated.

Further, since at least two eccentricity correcting projections are provided, the eccentricity correcting projections can be stabilized against externally applied force.

According to a second aspect of the present invention, the size of the eccentricity correction projection for absorbing eccentricity formed to absorb the gap between the inner diameter portion of the disk and the disk holding ring is 4
The range is 0 μm ± 20 μm.

This is a specification suitable for maintaining the radial accuracy of the mounted disk in consideration of variations in the inner diameter of the disk. Below the lower limit of the limited range, the radial accuracy of the disk decreases when the disk inner diameter increases, and above the upper limit of the limited range, the radial accuracy of the disk decreases when the disk inner diameter decreases.

According to a third aspect of the present invention, the spring load of one disk clamp pawl located substantially opposite to the eccentricity correction projection for absorbing eccentricity is greater than the spring load of the other disk clamp pawls. It is a strong configuration.

According to this configuration, the eccentricity correction projection that absorbs the eccentricity of the disk can be urged in a direction substantially opposite to that of the eccentricity correction projection, and accordingly, the radial deflection accuracy of the disk can be improved. .

According to a fourth aspect of the present invention, the difference between the spring load of one disk clamp pawl and the spring load of another disk clamp pawl is determined by the spring of an elastic spring that generates a spring load. It is composed of the difference between the constants. With such a configuration, the spring load of one disk clamp claw located on the substantially opposite side to the eccentricity correction protrusion that absorbs eccentricity,
Make it stronger than the spring load of other disc clamp claws. As a result, even during rotation of the disk, the disk can be rotated while maintaining the radial accuracy of the disk.

According to a fifth aspect of the present invention, the difference between the spring load of one disk clamp pawl and the spring load of another disk clamp pawl is determined by the compression length of the elastic spring that generates the spring load. This is the difference between the two. With such a configuration, the spring load of one disk clamp claw located on the side substantially opposite to the eccentricity correction projection that absorbs eccentricity is changed by changing the compression length from that of the other elastic springs. Make up the difference. As a result, even during rotation of the disk, the disk can be rotated while maintaining the radial accuracy of the disk.

According to a sixth aspect of the present invention, there is provided a disk holding ring having a substantially cylindrical shape for holding an inner diameter portion of a disk capable of recording and reproducing, and three or more disk holding rings housed inside the disk holding ring. A disc clamp pawl, an elastic spring for pressing the disc clamp pawl in a radial direction, a shaft for rotating the disc retaining ring, a bearing for supporting the shaft, and a disc retaining ring on at least two sides substantially opposite to the disc clamp pawl. Equipped with eccentricity correcting projections that absorb two or more eccentricities, the spring load of the two disk clamp claws located substantially opposite to the eccentricity correction projections that absorb eccentricity is greater than the spring load of the other disk clamp claws. It is a motor equipped with a disk clamp mechanism characterized by its strength.

As described above, two disk clamp claws are formed on the opposite side to the eccentricity correcting projection for absorbing at least two or more eccentricities, and at the same time, substantially opposite to the eccentricity correcting projection for absorbing the eccentricity. Since the spring load of the two disc clamp pawls located at is stronger than the spring load of the other disc clamp pawls, when the disc is clamped, the inner diameter of the disc hits the eccentricity correction projection that absorbs eccentricity. The contact makes it easy to position the disk. Further, since the spring loads of the two disk clamp claws are made larger than those of the other, it is possible to stabilize against externally applied force.

According to a seventh aspect of the present invention, the size of the eccentricity correction projection for absorbing eccentricity formed to absorb the gap between the inner diameter portion of the disk and the disk holding ring is 4.
The range is 0 μm ± 20 μm. This describes a specification suitable for maintaining the radial accuracy of the mounted disk in consideration of variations in the inner diameter of the disk. Below the lower limit of the limited range, the radial accuracy of the disk decreases when the disk inner diameter increases, and above the upper limit of the limited range, the radial accuracy of the disk decreases when the disk inner diameter decreases.

According to an eighth aspect of the present invention, the difference between the spring load of the two disk clamp pawls and the spring load of the other disk clamp pawl is determined by the spring of the elastic spring that generates the spring load. In such a configuration, the spring load of the two disk clamp pawls located on substantially the opposite side to the eccentricity correction projection that absorbs eccentricity is obtained by using such a configuration.
This is to make it stronger than the spring load of the other disk clamp claws. As a result, even during rotation of the disk, the disk can be rotated while maintaining the radial accuracy of the disk.

According to a ninth aspect of the present invention, the difference between the strength of the spring load of the two disc clamp pawls and the strength of the spring load of the other disc clamp pawl is determined by the compression of the elastic spring that generates the spring load. It is composed of differences in length. The difference between the spring loads of the two disk clamp claws, which are located substantially opposite to the eccentricity correcting projection that absorbs the eccentricity, is changed by changing the compression length of other elastic springs.
As a result, even during rotation of the disk, the disk can be rotated while maintaining the radial accuracy of the disk.

According to a tenth aspect of the present invention, there is provided a disk holding ring having a substantially cylindrical shape for holding an inner diameter portion of a disk capable of recording and reproduction, and three or more disk holding rings housed inside the disk holding ring. A disk clamp claw, an elastic spring that presses the disk clamp claw in the radial direction, a shaft that allows the disk holding ring to rotate, and a bearing that supports the shaft, wherein the center of the disk holding ring is This is a motor equipped with a disk clamp mechanism characterized in that it is eccentric to a side substantially opposite to a clamp claw.

As described above, since the center of the disk holding ring is formed so as to be eccentric with respect to the center of the shaft in a direction substantially opposite to the disk clamping claw, the gap between the inner diameter portion of the disk and the disk holding ring is formed. However, the center of the disk can be made substantially the same as the center of the shaft.

According to the eleventh aspect of the present invention, in order to absorb a gap between the inner diameter portion of the disk and the disk holding ring, the center of the disk holding ring and the center of the shaft are substantially opposite to the disk clamp claw. And the magnitude of the eccentricity is in the range of 40 μm ± 20 μm. This describes a specification suitable for maintaining the radial accuracy of the mounted disk in consideration of variations in the inner diameter of the disk. Below the lower limit of the limited range, the radial accuracy of the disk decreases when the disk inner diameter increases, and above the upper limit of the limited range, the radial accuracy of the disk decreases when the disk inner diameter decreases.

According to a twelfth aspect of the present invention, the spring load of one disk clamp claw located on the opposite side to the direction in which the center of the disk holding ring is eccentric from the center of the shaft is determined. This is a configuration in which the spring load of the other disk clamp claws is stronger. With this configuration,
The disc can be urged in the direction opposite to the direction in which the center of the disc holding ring is eccentric with respect to the center of the shaft, which can improve the radial deflection accuracy of the disc. Becomes

According to a thirteenth aspect of the present invention, the difference between the spring load of one disk clamp pawl and the spring load of another disk clamp pawl is determined by the spring of an elastic spring that generates the spring load. In such a configuration, the spring load of one disk clamp claw located on a side substantially opposite to the eccentricity correction projection that absorbs eccentricity can be reduced by the spring of the other disk clamp claw. Make it stronger than the load.
As a result, even during rotation of the disk, the disk can be rotated while maintaining the radial accuracy of the disk.

According to a fourteenth aspect of the present invention, the difference in strength between the spring load of one disk clamp pawl and the spring load of another disk clamp pawl is determined by the compression length of the elastic spring that generates the spring load. In this configuration, the spring load of one disk clamp claw located on a side substantially opposite to the eccentricity correction protrusion that absorbs eccentricity is changed in compression length from that of another elastic spring. This describes a specific measure for configuring the difference in the magnitude of the spring load. As a result, even during rotation of the disk, the disk can be rotated while maintaining the radial accuracy of the disk.

According to a fifteenth aspect of the present invention, there is provided a substantially cylindrical disc holding ring for holding an inner diameter portion of a recordable / reproducible disc, and three or more discs housed inside the disc holding ring. The disk clamp claw, the elastic spring that presses the disk clamp claw in the radial direction, the shaft that allows the disk holding ring to rotate, the bearing that supports the shaft, and the center of the disk holding ring eccentric from the center of the shaft A motor equipped with a disk clamp mechanism characterized in that the spring loads of two disk clamp claws located on opposite sides with respect to the direction in which the disk clamps are located are stronger than the spring loads of the other disk clamp claws. . Thus, the center of the disk holding ring constitutes two disk clamp claws located on the opposite side of the center of the shaft, and the center of the disk holding ring is located on the opposite side of the center of the shaft. Since the spring loads of the two disk clamp claws are made larger than the other, the disk clamp pawls can be stabilized against externally applied forces.

According to a sixteenth aspect of the present invention, in order to absorb a gap between the inner diameter portion of the disk and the disk holding ring, the center of the disk holding ring and the center of the shaft are substantially opposite to the disk clamp pawl. And the magnitude of the eccentricity is in the range of 40 μm ± 20 μm. This describes a specification suitable for maintaining the radial accuracy of the mounted disk in consideration of variations in the inner diameter of the disk. Below the lower limit of the limited range, the radial accuracy of the disk decreases when the disk inner diameter increases, and above the upper limit of the limited range, the radial accuracy of the disk decreases when the disk inner diameter decreases.

According to a seventeenth aspect of the present invention, the difference between the spring load of the two disk clamp pawls and the strength of the other disk clamp pawls is determined by the spring of the elastic spring that generates the spring load. In such a configuration, the spring load of the two disk clamp pawls located substantially opposite to the eccentricity correction projection that absorbs the eccentricity is reduced by the spring load of the other disk clamp pawls. Make it stronger than the load.
As a result, even during rotation of the disk, the disk can be rotated while maintaining the radial accuracy of the disk.

According to an eighteenth aspect of the present invention, the difference between the strength of the spring load of the two disc clamp pawls and the strength of the spring load of the other disc clamp pawl is determined by the compression of the elastic spring that generates the spring load. With such a configuration, the spring load of the two disk clamp claws located on substantially the opposite side to the eccentricity correction projection that absorbs eccentricity is obtained by this configuration.
By changing the compression length of other elastic springs, a difference in the magnitude of the spring load is formed. As a result, even during rotation of the disk, the disk can be rotated while maintaining the radial accuracy of the disk.

According to a nineteenth aspect of the present invention, there is provided a disk holding ring having a substantially cylindrical shape for holding an inner diameter portion of a disk capable of recording and reproducing, and three or more disk holding rings housed inside the disk holding ring. A disk clamp pawl, an elastic spring that presses the disk clamp pawl in a radial direction, a shaft that allows the disk holding ring to rotate, and a bearing that supports the shaft, wherein the disk holding ring biases the disk outward. A motor having at least one elastic member and a disk clamping mechanism characterized in that the center of the disk holding ring is eccentric to the center of the shaft and substantially opposite to the elastic member. .

As described above, one or more elastic members whose center is located on the opposite side of the center of the shaft with respect to the center of the shaft are formed at the outer peripheral portion of the disk holding ring, and the center of the disk holding ring is located at the center of the shaft. Since the disk is held by eccentricity with respect to the center to a side substantially opposite to the elastic member, the disk can be stabilized against an externally applied force.

According to a twentieth aspect of the present invention, in order to absorb a gap between the inner diameter portion of the disk and the disk holding ring, the center of the disk holding ring and the center of the shaft are substantially opposite to the disk clamp pawl. And the magnitude of the eccentricity is in the range of 40 μm ± 20 μm. This describes a specification suitable for maintaining the radial accuracy of the mounted disk in consideration of variations in the inner diameter of the disk. Below the lower limit of the limited range, the radial accuracy of the disk decreases when the disk inner diameter increases, and above the upper limit of the limited range, the radial accuracy of the disk decreases when the disk inner diameter decreases.

According to a twenty-first aspect of the present invention, the use of the motor according to any one of the first to twentieth aspects improves the accuracy of disk deflection and improves the reliability of information recording and reproduction. Thus, a more compact and thinner disk drive device can be obtained.

[0063]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a structural view of a motor equipped with a disk clamp mechanism according to the present invention. FIG. 2 is a plan view when a disk is mounted on the disk clamp mechanism according to the present invention.

As shown in FIG. 1, a disc (not shown)
A substantially cylindrical disk holding ring 7 for positioning and holding the inner diameter of the disk is provided with disk clamp claws 8a, 8a therein.
b, 8c. The disk holding ring 7 is attached to a turntable 4 fixed to the shaft 3.

The disk clamp claws 8a, 8b, 8c are pressed radially outward by elastic springs 9a, 9b, 9c.

Therefore, the disk clamp claws 8a, 8b, 8
The distal end 12 of c protrudes outside from the outer diameter portion 11 of the substantially cylindrical disk holding ring 7.

The outer diameter portion 11 of the disk holding ring 7 is provided with at least one or more substantially radial eccentricity correcting projections 13 and 14.

The eccentricity correcting projection 13 and the eccentricity correcting projection 14 are formed between the disk clamp claws 8b and 8c. In addition, the eccentric correction projection 13 and the eccentric correction projection 14
The center of the angle with respect to the axis center is the disc clamp claw 8
It is formed almost on the opposite side of a.

The projection amounts of the eccentricity correcting projections 13 and 14 in FIG. 1 are set at 40 μm. 1 and 2
The setting of the amount of the projection for correcting the eccentricity of the eccentricity correcting projections 13 and 14 shown in FIG.

FIG. 11 is a graph showing the amount of deflection of the outer diameter of the disk with respect to the inner diameter of the disk, using the amount of the eccentricity correction projection as a parameter. If there is no eccentricity correction projection, the amount of deflection of the disk outer diameter increases in proportion to the size of the disk inner diameter. For example, when the inner diameter of the disk is 15.15 mm, which is the maximum value of the standard, the deflection amount is 0.15 mm, so that it is not possible to satisfy the demand for the reduction of the whirling after the disk is mounted. Recording and reproduction errors are likely to occur.

However, when the eccentricity correcting projection is formed, it is possible to reduce the amount of deflection of the disk outer diameter in accordance with the amount of the eccentricity correcting projection. By the way, when the amount of the eccentricity correction projection is set to 40 μm, the deflection amount of the disk outer diameter is reduced to about half in the case of the maximum value of the standard of the disk inner diameter of 15.15 mm as compared with the case without the eccentricity correction projection. It is possible to reduce it.

Also, when the amount of the eccentricity correcting projection is 40 μm, even when the standard value of the disk inner diameter is the minimum value, the fluctuation amount of the disk outer diameter does not greatly deteriorate. As described above, by appropriately setting the amount of the eccentricity correction projection, it is possible to reduce, stabilize, and reduce the fluctuation amount of the disk outer diameter with respect to the variation from the minimum to the maximum of the specification of the disk inner diameter.

The amount of the eccentric correction projection is determined by the disc holding ring 7.
Considering the variation of the shape at the time of fabrication,
A range of 0 μm can be said to be appropriate.

As shown in FIG. 2, when the disk 5 is inserted into the disk holding ring 7, the inner diameter portion 15 of the disk 5
Are in contact with the eccentric correction projection 13 and the eccentric correction projection 14. On the other hand, the eccentric correction projection 13 and the eccentric correction projection 1
The disc clamp claw 8a located on the opposite side of the disc clamp 4 has a stronger force to press the disc 5 outward than the other disc clamp claws 8b and 8c. Therefore, the disk clamp pawl 8a presses the disk 5 in the direction of the arrow A1. As a result, the disk 5 becomes the eccentric correction projection 1
The disk 5 itself can be supported even during rotation by the disks 3 and 14 and the disk clamp pawl 8a.

As a result, the disk center DS of the disk 5
Are mounted at substantially the same position as the shaft rotation center RS, and maintain the state where the eccentricity is reduced during rotation, while maintaining the eccentricity correcting projection 13, the eccentricity correcting projection 14, and the disk clamp claws 8a, 8b, 8c. Rotated supported by. Therefore, even during rotation, the eccentricity of the disk is reduced, so that the vibration is reduced and the performance can be improved.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.

FIG. 3 is a structural view of a motor equipped with the disk clamp mechanism according to the present invention. FIG. 4 is a plan view when a disk is mounted on the disk clamp mechanism according to the present invention.

As shown in FIG. 3, a disc (not shown)
A substantially cylindrical disk holding ring 7 for positioning and holding the inner diameter of the disk is provided with disk clamp claws 8a, 8a therein.
b, 8c. The disk holding ring 7 is attached to a turntable 4 fixed to the shaft 3.

The disk clamp claws 8a, 8b, 8c are pressed outward in the radial direction by elastic springs 9a, 9b, 9c.

Therefore, the disk clamp claws 8a, 8b, 8
The distal end 12 of c protrudes outside from the outer diameter portion 11 of the substantially cylindrical disk holding ring 7.

The center HS of the disk holding ring 7 is configured with an eccentric amount X2 with respect to the shaft rotation center RS.

The magnitude of the eccentricity in FIG. 3, ie, the amount of eccentricity X2, is suitably in the range of 40 μm ± 20 μm.

The spring loads of the two disk clamp claws 8b, 8c located substantially opposite to the direction in which the center HS of the disk holding ring 7 is eccentric from the center of the shaft 3, that is, the shaft rotation center RS. Is made stronger than the spring load of the other disk clamp claws 8a so as to have a difference in spring load.

Specifically, the difference between the spring loads is determined by the elastic springs 9a, 9a which generate the spring load between the two disk clamp claws 8b, 8c and the other disk clamp claws 8a.
It is configured by the difference between the spring constants b and 9c.

More specifically, the elastic springs 9b and 9c of the two disk clamp claws 8b and 8c are made stronger than the elastic springs 9a of the other disk clamp claws 8a by changing the compression length. With such a configuration, the elastic springs 9a, 9b, 9c used for the disk clamp claws 8a, 8b, 8c can use the same specification springs, so that productivity and different springs do not need to be used. Mixing can be eliminated. The difference between the spring load of the two disk clamp claws 8b and 8c and the spring load of the other disk clamp claws 8a is the same even if an elastic spring having a different elastic spring load is used.

As shown in FIG. 4, when the disk 5 is inserted into the disk holding ring 7, the inner diameter portion 15 of the disk 5
Is configured so that the spring load of the disk clamp claws 8b and 8c is greater than the spring load of the other disk clamp claws 8a while having a difference in spring load, so that the inner diameter portion of the disk is pressed in the arrow direction A2. It is clamped in the state.

Originally, the center HS of the disk holding ring 7 is formed with an eccentric amount X2 with respect to the shaft rotation center RS.

The direction opposite to the direction of the eccentric amount X2, that is,
The spring load of the disk clamp claws 8b and 8c located at 120 degrees with respect to the direction of X2 is configured to be strong. Therefore, the direction of the eccentric amount X2 with respect to the shaft rotation center RS and the direction A2 in which the disk 5 is pressed when the disk 5 is clamped.
Are opposite to each other, so that the inner diameter portion 1 of the disk 5
The gap between the disk 5 and the disk holding ring 7 can be absorbed. As a result, even when the disk 5 is clamped, the center of rotation RS of the disk and the center DS of the disk after the clamping can be substantially matched. Therefore, even during rotation, the eccentricity of the disk is reduced, so that the vibration is reduced and the performance can be improved.

FIG. 5 is a structural view of a motor equipped with the disk clamp mechanism according to the present invention. FIG. 6 is a plan view when a disk is mounted on the disk clamp mechanism according to the present invention.

As shown in FIG. 5, a disc (not shown)
A substantially cylindrical disk holding ring 7 for positioning and holding the inner diameter of the disk is provided with disk clamp claws 8a, 8a therein.
b, 8c. The disk holding ring 7 is attached to a turntable 4 fixed to the shaft 3.

The disk clamp claws 8a, 8b, 8c are pressed outward in the radial direction by elastic springs 9a, 9b, 9c.

Therefore, the disk clamp claws 8a, 8b, 8
The distal end 12 of c protrudes outside from the outer diameter portion 11 of the substantially cylindrical disk holding ring 7.

The outer diameter portion 11 of the disk holding ring 7 is provided with at least one or more substantially radial eccentricity correcting projections 13 and 14. The eccentricity correction projection 13 and the eccentricity correction projection 14 are
a and is disposed so as to form an acute angle to the left and right with respect to the disk clamp claw 8a. The eccentricity correction projection 13 and the eccentricity correction projection 14 have substantially the same angular center substantially opposite to the angular center of the disk clamp claws 8b and 8c. The projection amount of the eccentricity correcting projections 13 and 14 in FIG.
mm.

The spring loads of the disk clamp claws 8b and 8c are made larger than the spring loads of the other disk clamp claws 8a so as to have a difference in spring load.

Specifically, the difference between the spring loads is determined by the elastic springs 9a, 9a which generate a spring load between the two disk clamp claws 8b, 8c and the other disk clamp claws 8a.
It is configured by the difference between the spring constants b and 9c.

More specifically, the elastic springs 9b and 9c of the two disk clamp claws 8b and 8c are made stronger than the elastic springs 9a of the other disk clamp claws 8a by changing the compression length.

With such a structure, the elastic springs 9a, 9c used for the disk clamp claws 8a, 8b, 8c are formed.
For b and 9c, springs having the same specifications can be used, and productivity and different springs do not need to be used, so that mixing of springs can be eliminated. Also, two disc clamp claws 8b,
8c, the spring load and other disc clamp pawls 8a
The effect is the same even if a spring having a different spring load from the elastic spring itself is used.

As shown in FIG. 6, when the disk 5 is inserted into the disk holding ring 7, the inner diameter portion 15 of the disk 5
Are in contact with the eccentric correction projection 13 and the eccentric correction projection 14. On the other hand, the eccentric correction projection 13 and the eccentric correction projection 1
4 and a disk clamp claw 8 located on the opposite side of the angle center
Since b and 8c have higher spring loads than the other disk clamp claws 8a, the disk inner diameter of the disk 5 is in the direction of the arrow A3.
As shown in the figure, it is clamped in the state of being pressed outward.

As a result, the disk 5 is fixed to the eccentricity correcting projections 13 and 14, and the disk clamp claws 8a, 8b and 8
The disk 5 itself can be supported even during rotation by c.

As a result, the disk center DS of the disk 5
Are mounted so as to be aligned with the shaft rotation center RS, and maintain the eccentric state during rotation, while maintaining the eccentricity correction projection 13, the eccentricity correction projection 14, the disk clamp claw 8b,
8c and supported by four points to rotate. Therefore, even during rotation, the eccentricity of the disk is reduced, so that the vibration is reduced and the performance can be improved.

FIG. 7 is a structural view of a motor equipped with a disk clamp mechanism according to the present invention. FIG. 8 is a plan view when a disk is mounted on the disk clamp mechanism according to the present invention.

As shown in FIG. 7, a disk (not shown)
A substantially cylindrical disk holding ring 7 for positioning and holding the inner diameter of the disk is provided with disk clamp claws 8a, 8a therein.
b, 8c. The disk holding ring 7 is attached to a turntable 4 fixed to the shaft 3.

The disk clamp claws 8a, 8b, 8c are pressed radially outward by elastic springs 9a, 9b, 9c.

Therefore, the disk clamp claws 8a, 8b, 8
The distal end 12 of c protrudes outside from the outer diameter portion 11 of the substantially cylindrical disk holding ring 7. The center HS of the disk holding ring 7 is configured with an eccentric amount X3 with respect to the shaft rotation center RS.

The magnitude of the eccentricity in FIG. 7, that is, the eccentric amount X2 is suitably in the range of 40 μm ± 20 μm.

Then, the spring load of the two disk clamp claws 8a located substantially opposite to the direction in which the center HS of the disk holding ring 7 is eccentric from the center of the shaft 3, that is, the shaft rotation center RS, is reduced. The disk clamp claws 8b and 8c are configured to have a difference in spring load so as to be stronger than the spring load.

The difference between the spring loads is, specifically, an elastic spring 9a that generates a spring load with the other disk clamp claws 8a in response to the spring load of the disk clamp claws 8b and 8c.
9b and 9c.

More specifically, the elastic springs 9b and 9c of the two disk clamp claws 8b and 8c are made stronger than the spring elastic spring 9a of the other disk clamp claws 8a by changing the compression length. With such a configuration, the elastic springs 9a, 9b, 9c used for the disk clamp claws 8a, 8b, 8c can use the same specification springs, so that productivity and different springs do not need to be used. Mixing can be eliminated. Also, the difference between the spring load of the two disc clamp claws 8b and 8c and the spring load of the other disc clamp claws 8a is the same even if an elastic spring having a different spring load is used. It is.

As shown in FIG. 8, when the disk 5 is inserted into the disk holding ring 7, the inner diameter 15 of the disk 5
Is configured so that the spring load of the disk clamp claw 8a is stronger than the spring loads of the other disk clamp claws 8b and 8c, so as to have a difference in spring load. Therefore, the inner diameter portion of the disk is clamped while being pressed outward as indicated by the arrow direction A4.

Originally, the center HS of the disk holding ring 7 is formed with an eccentric amount X3 with respect to the shaft rotation center RS, but in a direction opposite to the direction of the eccentric amount X3, that is, approximately 18 °.
The spring load of the disc clamp claw 8a located at 0 degrees is configured to be strong. Therefore, the direction of the eccentric amount X3 with respect to the shaft rotation center RS and the direction A4 in which the disk 5 is pressed when the disk 5 is clamped are opposite to each other, so that the gap between the inner diameter portion 15 of the disk 5 and the disk holding ring 7 is absorbed. Therefore, even if the disk 5 is clamped, the shaft rotation center R
S and the center DS of the clamped disk can be substantially matched. Therefore, even during rotation, the eccentricity of the disk is reduced, so that the vibration is reduced and the performance can be improved.

FIG. 9 is a structural view of a motor equipped with the disk clamp mechanism according to the present invention. FIG. 10 is a plan view when a disk is mounted on the disk clamp mechanism according to the present invention.

As shown in FIG. 9, a disk (not shown)
A substantially cylindrical disk holding ring 7 for positioning and holding the inner diameter of the disk is provided with disk clamp claws 8a, 8a therein.
b, 8c. The disk holding ring 7 is attached to a turntable 4 fixed to the shaft 3.

The disk clamp claws 8a, 8b, 8c are pressed radially outward by elastic springs 9a, 9b, 9c. Therefore, the disc clamp claw 8
The tips 12 of a, 8b, and 8c protrude outside from the outer diameter portion 11 of the substantially cylindrical disk holding ring 7. The center HS of the disk holding ring 7 has an eccentric amount X4 with respect to the shaft rotation center RS.

The magnitude of the eccentricity in FIG. 9, that is, the amount of eccentricity X4 is suitably in the range of 40 μm ± 20 μm.

Two movable centering members 16a and 16b are located on substantially opposite sides of the center HS of the disk holding ring 7 from the center of the shaft 3, that is, the shaft rotation center RS. Have been. The movable centering members 16a and 16b have an arch shape, and are configured to be able to press the outer peripheral side of the inner diameter portion of the disk.

As shown in FIG. 10, when the disk 5 is inserted into the disk holding ring 7, the inner diameter portion 1 of the disk 5
5 is clamped in a state where the inner diameter portion of the disk is pressed in the direction of arrow A5 by the movable centering members 16a and 16b.

Originally, the center HS of the disk holding ring 7 is formed with an eccentric amount X4 with respect to the shaft rotation center RS, but in a direction opposite to the direction of the eccentric amount X4, that is, approximately 18 °.
The movable centering members 16a and 16b located at 0 degrees are configured. Therefore, the direction of the amount of eccentricity X4 with respect to the shaft rotation center RS and the direction A5 in which the disk 5 is pressed when the disk 5 is clamped are opposite to each other, so that the gap between the inner diameter portion 15 of the disk 5 and the disk holding ring 7 is absorbed. Therefore, even if the disk 5 is clamped, the center of rotation of the shaft RS and the center of the disk after clamping can be made to substantially match. Therefore, even during rotation, the eccentricity of the disk is reduced, so that the vibration is reduced and the performance can be improved.

As described above with reference to FIGS. 1 to 11, for the centering of the disk, an elastic member such as an O-ring or a disk holding member or a guide member formed of a metal plate is not specially constructed. By devising the structure of the disk holding ring formed in the motor itself, it is possible to provide a function of clamping the disk and a highly accurate disk centering function.

Therefore, without the need for a chucking magnet, there is a possibility that the centering needs to be improved due to variations in the composition and dimensions of the elastic member, changes over time, unevenness in mounting the disc, and misalignment due to various conditions. There is a more accurate composition and dimensional variation of the required elastic member, aging, unevenness when loading the disc,
There is a possibility that the centering needs to be improved due to misalignment of the centering due to other various conditions, and it is possible to enhance the demand for higher accuracy and the centering function of the disk.

Furthermore, since special components such as an elastic member such as an O-ring and a disk holding member and a guide member formed of a metal plate are not used, it is possible to meet demands which are economically superior. .

Although the embodiments of the present invention have been described above, the present invention is not limited to the above embodiments, and various applications and developments are possible within the scope of the present invention.

[0123]

As is apparent from the above description, according to the present invention, in a disk clamp mechanism of a motor, a disk drive device for recording and reproducing information on an optical disk, a magneto-optical disk, and the like, and miniaturization and thinning of equipment. DVD devices such as DVD-ROMs and DVD-RAMs have been developed to meet the requirements of (1) and (2) in order to improve the reliability of recording and reproducing information due to the narrower track pitch.
Demands for improved accuracy of centering technology compared to D-ROM, and a function to clamp a disk with a disk holding ring configured in the motor itself, and
An object of the present invention is to solve a demand for a centering type self-holding clamp mechanism capable of centering a disk. In addition, it also responds to demands that are high in reliability and economical. The present invention provides a centering type self-holding clamp mechanism capable of achieving an excellent centering function of a disk which realizes high reliability and high accuracy, and can respond to a demand for downsizing and thinning of a device.

[Brief description of the drawings]

FIG. 1 is a structural diagram of a motor equipped with a disk clamp mechanism according to a first embodiment of the present invention.

FIG. 2 is a plan view when a disk is mounted on the disk clamp mechanism according to the first embodiment of the present invention.

FIG. 3 is a structural diagram of a motor equipped with a disk clamp mechanism according to a second embodiment of the present invention.

FIG. 4 is a plan view when a disc is mounted on the disc clamp mechanism according to the second embodiment of the present invention.

FIG. 5 is a structural diagram of a motor equipped with a disk clamp mechanism according to a third embodiment of the present invention.

FIG. 6 is a plan view when a disc is mounted on the disc clamp mechanism according to the third embodiment of the present invention.

FIG. 7 is a structural diagram of a motor equipped with a disk clamp mechanism according to a fourth embodiment of the present invention.

FIG. 8 is a plan view when a disc is mounted on a disc clamp mechanism according to a fourth embodiment of the present invention.

FIG. 9 is a structural diagram of a motor equipped with a disk clamp mechanism according to a fifth embodiment of the present invention.

FIG. 10 is a plan view when a disc is mounted on the disc clamp mechanism according to the fifth embodiment of the present invention.

FIG. 11 is a graph showing a fluctuation amount of a disk outer diameter according to a disk inner diameter.

FIG. 12 is a structural diagram of a motor equipped with a disk clamp mechanism according to a conventional embodiment.

FIG. 13 is a plan view of a disk clamp mechanism according to a conventional embodiment.

FIG. 14 is a plan view showing a state where a disk is mounted on the disk clamp mechanism of the conventional embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Bracket assembly 2 Metal 3 Shaft 4 Turntable 5 Disk 6 TT cushion 7 Disk holding ring 8a, 8b, 8c Disk clamp claw 9a, 9b, 9c Elastic spring 10 Disk holding ring mechanism 11 Outer diameter part 12 Tip 13, 14 Eccentricity Correction projection 15 Inner diameter part 16a, 16b Movable centering member

Claims (21)

[Claims] 1. A substantially cylindrical disc holding ring for holding an inner diameter portion of a recordable and reproducible disc, three or more disc clamp claws housed inside the disc holding ring, and the disc clamp claws. An elastic spring that presses the disk holding ring in the radial direction, a shaft that allows the disk holding ring to rotate, and a bearing that supports the shaft, wherein the disk holding ring is at least two or more on a side substantially opposite to the disk clamp pawl. A motor equipped with a disk clamp mechanism having an eccentricity correcting projection for absorbing eccentricity. 2. The motor equipped with the disk clamp mechanism according to claim 1, wherein the size of the eccentricity correcting projection for absorbing eccentricity is in a range of 40 μm ± 20 μm. 3. The spring load of one disk clamp pawl located substantially opposite to the eccentricity correcting projection for absorbing eccentricity,
2. The motor equipped with the disk clamp mechanism according to claim 1, wherein the motor is stronger than the spring load of the other disk clamp pawls. 4. The method according to claim 1, wherein the difference between the strength of the spring load of one disc clamp pawl and the strength of the spring load of the other disc clamp pawl is the difference between the spring constants of the elastic springs that generate the spring load. A motor equipped with the disk clamp mechanism according to claim 3. 5. The method according to claim 1, wherein a difference in strength between the spring load of one disk clamp pawl and the spring load of the other disk clamp pawl is configured by changing the compression length of an elastic spring that generates the spring load. A motor equipped with the disk clamp mechanism according to claim 3. 6. A substantially cylindrical disc holding ring for holding an inner diameter portion of a recordable and reproducible disc, three or more disc clamp claws housed inside the disc holding ring, and the disc clamp claws. An elastic spring that presses the disk in the radial direction, a shaft that makes the disk holding ring rotatable, a bearing that supports the shaft, and the disk holding ring that is at least two The eccentricity correction projection for absorbing the core is provided, and the spring load of the two disk clamp claws located substantially opposite to the eccentric absorption eccentricity correction projection is stronger than the spring loads of the other disk clamp claws. A motor equipped with a disc clamp mechanism. 7. A motor equipped with the disk clamp mechanism according to claim 6, wherein the size of the eccentricity correcting projection for absorbing eccentricity is in a range of 40 μm ± 20 μm. 8. The difference between the strength of the spring load of the two disc clamp pawls and the strength of the spring load of the other disc clamp pawls is constituted by the difference between the spring constants of the elastic springs that generate the spring loads. A motor having the disk clamp mechanism according to claim 6 mounted thereon. 9. The difference in strength between the spring load of two disk clamp pawls and the spring load of the other disk clamp pawls is configured by changing the compression length of an elastic spring that generates a spring load. A motor equipped with the disk clamp mechanism according to claim 8. 10. A substantially cylindrical disc holding ring for holding an inner diameter portion of a recordable and reproducible disc, three or more disc clamp claws housed inside the disc holding ring, and the disc clamp claws. An elastic spring that presses the disk holding ring in the radial direction, a shaft that allows the disk holding ring to rotate, and a bearing that supports the shaft, wherein the center of the disk holding ring is located at the center of the shaft, and A motor equipped with a disk clamp mechanism characterized by being eccentric to the opposite side. 11. A motor equipped with the disk clamp mechanism according to claim 10, wherein the magnitude of the eccentricity is in a range of 40 μm ± 20 μm. 12. The spring load of one disk clamp pawl located on the opposite side to the direction in which the center of the disk holding ring is eccentric from the center of the shaft, is stronger than the spring load of the other disk clamp pawls. The motor equipped with the disk clamp mechanism according to claim 10, wherein the motor is configured to be configured as follows. 13. The difference in strength between the spring load of one disk clamp pawl and the spring load of another disk clamp pawl is:
13. The motor equipped with the disk clamp mechanism according to claim 12, wherein the motor is constituted by a difference between spring constants of elastic springs that generate a spring load. 14. The difference in strength between the spring load of one disk clamp pawl and the spring load of another disk clamp pawl is
The motor equipped with the disk clamp mechanism according to claim 12, wherein the motor is configured by changing a compression length of an elastic spring that generates a spring load. 15. A substantially cylindrical disc holding ring for holding an inner diameter portion of a recordable and reproducible disc, three or more disc clamp claws housed inside the disc holding ring, and the disc clamp claws. An elastic spring that presses the disk in the radial direction, a shaft that makes the disc holding ring rotatable, and a bearing that supports the shaft,
With respect to the direction in which the center of the disc holding ring is eccentric from the center of the shaft, the spring loads of the two disc clamp claws located on opposite sides are made stronger than the spring loads of the other disc clamp claws. A motor equipped with a disk clamp mechanism characterized by the above configuration. 16. A motor having the disk clamp mechanism according to claim 15, wherein the magnitude of the eccentricity is in a range of 40 μm ± 20 μm. 17. The difference in strength between the spring load of two disc clamp pawls and the spring load of another disc clamp pawl is:
16. The motor equipped with the disk clamp mechanism according to claim 15, wherein the motor is configured by a difference of a spring constant of an elastic spring that generates a spring load. 18. The difference in strength between the spring load of two disc clamp pawls and the spring load of another disc clamp pawl is:
16. The motor equipped with the disk clamp mechanism according to claim 15, wherein the motor is configured by changing a compression length of an elastic spring that generates a spring load. 19. A substantially cylindrical disc holding ring for holding an inner diameter portion of a recordable and reproducible disc, three or more disc clamp claws housed inside the disc holding ring, and the disc clamp claws. An elastic spring that presses the disk radially, a shaft that allows the disk holding ring to rotate, and a bearing that supports the shaft, wherein the disk holding ring has one or more elastic members that bias the disk outward. A motor having a disk clamp mechanism, comprising: a member; and a center of the disk holding ring is eccentric to a side substantially opposite to the elastic member with respect to a center of the shaft. 20. A motor equipped with the disk clamp mechanism according to claim 19, wherein the magnitude of the eccentricity is in a range of 40 μm ± 20 μm. 21. Any one of claims 1 to 20
A disk drive device equipped with the motor according to the paragraph.