JPH10308047A - Disk clamper - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce a contact area with a disk and to suppress vibration during the rotation of the disk by providing at least three of first projections in the contact surface with the disk and second projections among the first projections, the second projections being protruded to a disk side more than the first projections and contacted with the disk with elastic forces. SOLUTION: First projections 5 are formed in the three fixed parts 4a of a contact surface 4 with a disk, and a second projection 6 is formed in an elastic part 4b. The second projection 6 is set slightly higher than the first projections 5. Thus, when the disk is clamped, only the first and second projections 5 and 6 are contacted with the disk to reduce a contact area and, since the second projection 6 applies pressing so as to pull the first projections away from the disk, sticking to the disk is prevented, and also since the disk are supported on multiple points by the first and second projections 5 and 6, vibration during the rotation of the disk is suppressed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for inserting a disc such as a CD (compact disc), an LD (laser disc), an MD (mini disc), a DVD (DIGITAL VERSATILE DISC or digital video disc) and an MO into a turntable. The present invention relates to a disc clamper that rotates together with a disc and a turntable while holding the disc clamper between the disc and a turntable. More specifically, the present invention relates to an improvement in a contact surface of a disk clamper with a disk.

[0002]

2. Description of the Related Art Reproduction (recording) of disks such as CDs and DVDs
The apparatus uses a disk clamper to hold and rotate the disk on a turntable. As shown in FIG. 13, the disc clamper 100
1 is disposed on the opposite side of the turntable 102. Then, the magnet 103 fixed to the disk clamper 100 is a turntable 1 made of a magnetic material.
The disk clamper 100 and the turntable 102 hold the central portion of the disk 101 by attracting the disk 101 to the disk 101. When holding the disk 101, the centering ring 104 of the turntable 102 fits into the central through hole 101 a of the disk 101 to center the disk 101. Further, the spindle motor 105 to which the turntable 102 is attached is driven to drive the turntable 1
Rotate 02. As the turntable 102 rotates, the disk 101 and the disk clamper 100 rotate.

On the other hand, the contact surface 100a of the disk clamper 100 with the disk 101 is flat. Then, the disk 101 and the disk clamper 100 are brought into close contact with each other over a wide area to suppress the generation of vibrations when the disk 101 rotates.

[0004]

However, in the above-described disk clamper 100, the contact surface 100a with the disk 101 is flat and has a large contact area. There is a possibility that the disk 101 may stick to the disk. If the disc 101 is stuck to the disc clamper 100, when the disc 101 is removed from the disc playback device, the clamper arm 1
06 and turn the disk clamper 100 on the turntable 10
The disk 101 is lifted at the same time when the disk 101 is separated from the disk 2. As a result, the disc 101 may not be ejected from the disc reproducing apparatus, or the disc 101 may fall in the disc reproducing apparatus and hinder movement of a movable member such as a carriage.

In order to solve this problem, there is one in which three protrusions are formed on the contact surface 100a of the disk clamper 100 with the disk 101. When the disc clamper 100 clamps, each projection is
By contacting the disk 1, the contact area between the disk clamper 100 and the disk 101 is reduced, and sticking can be prevented. However, the contact area of the disc clamper 100 is too small,
Vibration during rotation cannot be suppressed.

Further, it is conceivable that a large number of projections exceeding three are formed on the contact surface 100a of the disk clamper 100 with the disk 101, and the projections come into contact with the disk 101. However, since the number of projections in the disk clamper 100 exceeds three, not all projections can be brought into contact with the disk 101 and the disk clamper 100 due to warpage or shape error, and eventually the projections supporting the disk 101 Is about 3 points. Therefore, this disk clamper 100
However, since the contact area is too small, vibration during rotation of the disk 101 cannot be suppressed.

Accordingly, an object of the present invention is to provide a disk clamper that reduces the contact area between the disk clamper and the disk and suppresses vibration during rotation of the disk.

[0008]

In order to achieve the above object, an object of the present invention is to provide a disk clamper for holding a disk between a turntable and rotating the disk together with the turntable. A first projection formed at least in three places and a first projection on the contact surface and projecting more toward the disk than the first projection, and having an elastic force on the held disk. And a second projection which comes into contact with the second projection.

Therefore, when the disk is clamped by the disk clamper and the turntable, only the first projection and the second projection contact the disk on the contact surface of the disk clamper. Thereby, the contact area between the disk and the disk clamper can be reduced.

Here, the first projection comes into contact with the disk under the clamping force of the disk clamper and the turntable. Since the first protrusions are formed in at least three places, at least three first protrusions come into contact with the disk. In addition, the second protrusion projects more toward the disk than the first protrusion and contacts the held disk with an elastic force, so that the first protrusion contacts the disk to cause the second protrusion to The disc is in contact with the disc while being pushed by the disc.

At this time, the second projection has an elastic force and contacts the disk. Thereby, the height of the second protrusion with respect to the disk can be given a width vertically above and below the height of the first protrusion. For this reason, even if the disk and the disk clamper have a warp or a shape error, at least three first projections and all the second projections can contact and hold the disk.

Further, in the disk clamper according to the present invention, the first projection is formed of a material which is formed on a fixed portion of the contact surface and maintains a shape even when receiving a clamping force by the held disk. Is formed on the elastic portion of the contact surface.

Therefore, since the first protrusion is not pushed by the disk when clamping the disk, the disk can be firmly clamped. When the second projection is pushed by the disk, the elastic portion is deformed. Thereby, an elastic force can be reliably applied to the second projection.

Further, in the disk clamper according to the third aspect, the first protrusion is formed at three places and the second protrusion is formed at 3 × n (n is a natural number) places. Therefore, the same number of second protrusions can be formed between each first protrusion. Thereby, the rotational balance of the disk clamper can be improved.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The configuration of the present invention will be described below in detail based on an example of an embodiment shown in the drawings. A disc clamper 1 according to the present invention is built in a disc reproducing apparatus, and as shown in FIGS.
Is held and clamped between the turntable 3 and the disk 2 is rotated together with the turntable 3. The disk clamper 1 has first contact surfaces 4 formed at at least three places on the contact surface 4 with the disk 2.
Formed between the first protrusion 5 of the contact surface 4 and the first protrusion 5 toward the disk 2 from the first protrusion 5. And a second projection 6 which is formed.

The disc clamper 1 includes a clamper body 7, a lid 8, a magnet 9, and a metal ring 10. The clamper body 7 includes a substantially disk-shaped clamp plate 11 and a cylindrical holding tube 12. And
In the vicinity of the outer peripheral portion of the contact surface 4 of the clamp plate 11 with the disk 2, arc-shaped slits 13 of about 60 degrees are formed at three places at a pitch of 120 degrees about the center of rotation.

On the contact surface 4, there are formed a fixed portion 4a having a rigidity which is not deformed by a clamping force for clamping the disk 2 and an elastic portion 4b deformed by the clamping force. Here, the elastic portion 4b has three slits 1
There are three arc-shaped elongated portions (indicated by hatching in FIG. 1B) between 3 and the outer peripheral edge of the clamp plate 11. For this reason, since each elastic portion 4b is supported only at both ends in the circumferential direction, it has low rigidity and is elastically deformed by receiving a clamping force.

Further, the fixed portion 4a is formed with the slits 1 adjacent to each other.
There are three places near the outer circumference between 3 and 13. For this reason, since each fixed portion 4a is a plate-like portion without the slit 13 of the clamp plate 11, it has high rigidity and is not deformed by the clamping force.

A first projection 5 is formed near the fixed portion 4a of the contact surface 4, that is, near the outer peripheral portion between the slits 13. The first projection 5 has 12 fixed portions 4 a on the contact surface 4.
It is formed at three places at a pitch of 0 degrees. A second projection 6 is formed at a central portion of each elastic portion 4b. Therefore, the first projections 5 and the second projections 6 are formed at a total of six locations every 60 degrees. According to this arrangement, since the center of gravity of the arrangement position of each of the projections 5 and 6 coincides with the center of rotation, the balance at the time of rotation of the disc clamper 1 can be improved. Further, it is preferable that the formation positions of the projections 5 and 6 are closer to the outer peripheral side of the contact surface 4. This makes it possible to reduce the length of the disk 2 to the unsupported outer peripheral edge, thereby more effectively suppressing vibration during rotation.

In the case of this embodiment, the first projection 5 and the second projection 6 are integrally formed of the same material as the clamp plate 11, but are not particularly limited thereto, and are separate members from the clamp plate 11. It is also possible to integrate the components molded by bonding or the like. Further, an elastic body can be used as the second projection 6. In any case, the projections 5 and 6 are preferably made of a material softer than the disk material of the portion where the projections 5 and 6 abut so as not to damage the disk 2 at the portion where they abut.

The second projection 6 projects slightly higher than the first projection 5 toward the disk 2. This allows
As shown in FIGS. 5 and 6, when clamping the disc 2,
The first projection 5 contacts the disk 2 and the second projection 6 contacts the disk 2 in a state where the elastic portion 4b is bent by being pushed by the disk 2. Therefore, even if the disk 2 has irregularities or warpage, all the first projections 5 and the second projections 6 can come into contact with the disk 2, and the disk 2 is supported by a large number of projections 5, 6 to prevent vibration. Can be achieved.

On the other hand, a through hole 1 is provided at the center of the clamp plate 11.
1a is formed. The edge of the through hole 11a is bent at about 45 degrees to the opposite side of the disk 2. The bent edge is used as a magnet supporting portion 14.

Further, the holding cylinder 12 of the clamper body 7 is formed on the side of the clamp plate 11 opposite to the contact surface 4 on the outside of the magnet support portion 14. An annular magnet 9 and metal rings 10 and 10 are housed inside the holding cylinder 12. The magnet 9 is supported by a magnet support 14 of the clamp plate 11. The magnet 9 is attracted to the turntable 3 as shown in FIG. Due to this suction, the disk clamper 1 and the turntable 3 clamp the disk 2.

The lid 8 comprises a cylindrical lid tube 15,
A cover plate 16 that closes one opening of the cover tube 15 and protrudes in a flange shape outside the cover tube 15 is provided. The cover tube 15 is fitted inside the holding tube 12 of the clamper body 7. This fitting is performed by locking the claw 15a of the lid tube 15 with the locking hole 12a of the holding tube 12. By this fitting, the magnet 9 and the metal ring 1 are placed between the lid plate 16 of the lid 8 and the magnet support portion 14 of the clamp plate 11.
0 and 10 are held. A centering projection 17 reaching the height of the clamp plate 11 is formed at the center of the cover plate 16.

Further, as shown in FIGS. 3 to 6, a clamper arm 18 of the disc reproducing apparatus is provided around the holding cylinder 12. The clamper arm 18 is the lid 8
Can be engaged with the outer peripheral portion of the cover plate 16. Therefore, when the clamper arm 18 is far away from the turntable 3 as shown in FIGS. 3 and 4, the disk clamper 1 is suspended and supported by the clamper arm 18. When the clamper arm 18 is near the turntable 3 as shown in FIGS. 5 and 6, the disc clamper 1 is detached from the clamper arm 18 and is attracted to the turntable 3.

On the other hand, the turntable 3 is made of a magnetic material such as iron, and has a disk-shaped disk mounting plate 19 and a frusto-conical centering plate 20 integrally formed at the center of the disk mounting plate 19. And a centering hole 21 formed in a center portion of an end face of the centering plate 20 facing the magnet 9.
This turntable 3 is a spindle motor (not shown)
And is rotated by the driving of the motor.

Then, the disk 2 is placed on the disk
When the disc 2 is placed on the disc 2, the center through hole 2 a of the disc 2 is fitted to the centering plate 20, and the turntable 3 and the disc 2 are aligned. When the disk clamper 1 and the turntable 3 clamp the disk 2, the centering projections 17 of the disk clamper 1 are fitted into the centering holes 21 of the turntable 3 and the center of the turntable 3 and the disk clamper 1 is adjusted. Matching is performed. Therefore,
Turntable 3, disk 2 and disk clamper 1
Is rotated by driving the spindle motor in a completely aligned state.

The operation of releasing the clamp after clamping and rotating the disk 2 by the disk clamper 1 will be described below.

Disc 2 inserted into disc playback device
Is mounted on the turntable 3 as shown in FIG. 3 by the movement of the carriage. Here, since the center through hole 2a of the disk 2 is fitted to the centering plate 20 of the turntable 3, the centering of the disk 2 and the turntable 3 is performed. At this time, the disk clamper 1 is suspended at a position away from the disk 2 by the clamper arm 18.

Then, the clamper arm 18 is moved closer to the disk 2 side. Thereby, as shown in FIG. 4, first, the second protrusion 6 of the disk clamper 1 comes into contact with the disk 2. At this time, the first projection 5 has not yet contacted the disk 2.

Further, the clamper arm 18 is brought closer to the disk 2 to release the engagement between the clamper arm 18 and the disk clamper 1. Thereby, the magnet 9 of the disk clamper 1 is attracted to the turntable 3 as shown in FIGS. As a result, the second projection 6 is pushed in, the elastic portion 4b of the clamp plate 11 is bent, and
The first projection 5 contacts the disk 2.

Here, the second projection 6 projects more toward the disk 2 than the first projection 5 and can be moved up and down slightly more than the height of the first projection 5 by deformation of the elastic portion 4b. Even if a shape error such as warpage occurs in the disk 2 or the disk clamper 1, all the second protrusions 6 can contact the disk 2. In addition, since the first projections 5 are formed at three places, all the first projections 5 are formed regardless of a shape error such as a warp of the disk 2 or the disk clamper 1.
Can contact the disk 2. Therefore, all the first projections 5 and the second projections 6 can contact the disk 2, so that the disk 2 can be supported at multiple points,
Vibration during rotation of the disk 2 can be suppressed.

On the other hand, when ejecting the disk 2 from the state in which the disk 2 is clamped as shown in FIGS. 5 and 6, the clamper arm 18 is moved in a direction away from the disk 2 to engage with the cover plate 16 to engage the disk clamper. Raise 1 At this time, since the contact between the disk clamper 1 and the disk 2 is a point contact by the first projection 5 and the second projection 6, even if the disk 2 is sticky with dirt or glue, It does not stick to the contact surface 4.

In addition, the first projection 5 and the second projection 5 shown in FIG.
When the first projection 5 shown in FIG. 4 is separated from the disk 2 from the state where all of the projections 6 are in contact with the disk 2, the elastic portion 4b that has been elastically deformed is restored by its elastic force. At this time, the elastic force of the elastic portion 4b acts on the disk 2 via the second protrusion 6, and the disk clamper 1
Is pushed up, so that the first projection 5 can be easily separated from the disk 2. This allows
Sticking between the first projection 5 and the disk 2 that are in stronger contact can be prevented.

The above embodiment is an example of a preferred embodiment of the present invention, but the present invention is not limited to this, and various modifications can be made without departing from the spirit of the present invention. For example, in the present embodiment, one second protrusion 6 is formed on each elastic portion 4b. However, the present invention is not limited to this, and two or more second protrusions 6 may be formed on each elastic portion 4b. Alternatively, as shown in FIG. 7, the second protrusions 6, 6 may be formed near both ends in the circumferential direction of each elastic portion 4b. In this case, six second protrusions 6 are formed on the contact surface 4. According to this disk clamper 1,
Since the contact area between the disk clamper 1 and the disk 2 can be increased to such an extent that the disk clamper 1 and the disk 2 do not stick together, vibration can be more reliably prevented when the disk 2 rotates, and the disk clamper can be used. 1 and the disk 2 can be prevented from sticking. In addition, the center of gravity of the six second protrusions 6 becomes the center of the disc clamper 1, so that the rotational balance can be improved.

In the above embodiment, the elastic portion 4b
Slit 1 along the circumferential direction of the contact surface 4 to form
3, the elastic portion 4b can be formed by two parallel slits 13 along the radial direction of the contact surface 4 as shown in FIG. 8, for example. That is, the portion between the slits 13 is an elastic portion 4b. Then, one second projection 6 is formed on the elastic portion 4b. Also in this case, since the second projections 6 are formed on the elastic portion 4b, all the second projections 6 can come into contact with the disk 2. Therefore, vibration isolation during rotation of the disk 2 can be performed. As a result, the sticking between the disk clamper 1 and the disk 2 can be prevented.

Further, two ends of the two slits 13 in the embodiment shown in FIG. 8 may be connected to each other. That is, as shown in FIG.
Two radial slits 13 a, 13 a and each radial slit 13 along the radial direction of the contact surface 4 between the first projections 5.
a, circumferential slit 13 connecting outer peripheral ends of 13a and 13a
b, a U-shaped slit 13 is formed, and a portion surrounded by the slits 13a and 13b can be an elastic portion 4b. Then, one second projection 6 is formed on the elastic portion 4b. In this case, since the elastic portion 4b is connected to the fixed portion 4a only at one place, the elasticity of the elastic portion 4b can be reduced. This allows
Even if the number of the elastic portions 4b is increased, the clamping can be performed firmly. In addition, since all the second protrusions 6 are formed on the elastic portion 4b, all the second protrusions 6 can contact the disk 2, so that vibration proof during rotation of the disk 2 can be performed. With disk clamper 1
And the disk 2 can be prevented from sticking.

Further, the outer peripheral side ends of the two slits 13 in the embodiment shown in FIG. 8 may reach the outer periphery of the clamp plate 11. That is, as shown in FIG. 10, two slits 13 are formed between the first protrusions 5 of the clamp plate 11 and are parallel to the radial direction of the contact surface 4 and reach the outer edge of the clamp plate 11. The portion between the slits 13 can be an elastic portion 4b. Then, one second projection 6 is formed on the elastic portion 4b. In this case, since the elastic portion 4b is connected to the fixed portion 4a only at one place, the elastic portion 4b
Can be reduced in elasticity. Thus, even if the number of the elastic portions 4b is increased, the clamping force between the magnet 9 and the turntable 3 does not become large, and the clamping can be performed firmly. Also, since each second projection 6 is formed on the elastic portion 4b, all the second projections 6 can contact the disk 2, so that
It is possible to perform vibration isolation during rotation of the disk 2 and prevent sticking between the disk clamper 1 and the disk 2.

Further, in each of the above embodiments, the slit 13 is provided to form the elastic portion 4b, but the present invention is not limited to this. For example, as shown in FIG. 11, the surface opposite to the contact surface 4 is depressed at a portion between the first protrusions 5 of the clamp plate 11 to form a thin portion, and this is formed into an elastic portion 4b.
It can be. Then, one second projection 6 is formed on the elastic portion 4b. In this case, since the elasticity can be changed by changing the thickness of the thin portion, the elasticity can be easily set to a desired size.

In each of the above embodiments, the elastic portion 4
Although b is formed inside the circular contour of the clamp plate 11, it is not limited to this. For example, as shown in FIG.
A plate-shaped elastic portion 4b is formed so as to protrude outward from the outer edge of the clamp plate 11 at a position between the first protrusions 5 and at least one first protrusion at the tip portion. Two projections 6 are formed. In this case, the elastic part 4
Since b is continuous with the fixed portion 4a at only one location, the elasticity of the elastic portion 4b can be reduced. Thus, even if the number of the elastic portions 4b is increased, the clamping force between the magnet 9 and the turntable 3 does not become large, and the clamping can be performed firmly. In addition, since all the second protrusions 6 are formed on the elastic portion 4b, all the second protrusions 6 can contact the disk 2, so that vibration proof during rotation of the disk 2 can be performed. .

Further, in each of the embodiments shown in FIGS. 8 to 12, the number of the second protrusions 6 formed on each elastic portion 4b is one, but the number is not limited to this, and the number of the second protrusions may be two or more. Of course.

In each of the above-described embodiments, the first protrusion 5 is formed at three places and the second protrusion 6 is formed at a multiple of three. However, the present invention is not limited to this. For example, the first projection can be formed at four locations, and the second projection can be formed at a multiple of four. Of course, the first protrusion can be formed at five or more places. In each case, each second
Are formed on the elastic portion 4b, so that all the second protrusions 6 can come into contact with the disk 2, so that vibration can be prevented when the disk 2 rotates and the disk clamper 1 Sticking to the disk 2 can be prevented.

In each of the above embodiments, the type in which the magnet 9 is embedded in the disk clamper 1 and the iron plate is embedded in the turntable 3 is mainly described. It may be built in and an iron plate may be embedded on the clamper side.
Further, in each of the above-described embodiments, the disk clamper 1 and the turntable 3 clamp the disk 2 by the magnetic force of the magnet 9, but the invention is not limited thereto, and the clamp may be performed by a spring. Further, the present invention is also applicable to a structure in which the respective clamper members sandwiching the disk 2 are integrated.

Further, in each of the above embodiments, the contact surface 4
The second projection 6 is formed on the elastic portion 4b, but the present invention is not limited to this. For example, it is assumed that the entire clamp plate 11 has a uniform thickness so that any position of the contact surface 4 is not deformed by the clamping force, and the contact surface 4 is formed of an elastic body projecting more toward the disk 2 than the first protrusion 5. The second projection 6 can be attached by bonding. In this case, when the disk 2 is clamped, the second protrusion 6 is pushed by the disk 2 and is elastically deformed. Thus, all the second protrusions 6 can come into contact with the disk 2, so that vibration can be prevented when the disk 2 rotates and sticking between the disk clamper 1 and the disk 2 can be prevented. .

[0045]

As is apparent from the above description, the present invention of claim 1 is a disk clamper which holds a disk between a turntable and rotates the disk together with the turntable. It is formed between the first protrusion formed at three places and the first protrusion on the contact surface, and protrudes toward the disk from the first protrusion, and has an elastic force on the held disk. When the disk is clamped by the disk clamper and the turntable, the first protrusion is provided on the contact surface of the disk clamper.
Only the protrusion and the second protrusion contact the disk, and the contact area between the disk and the disk clamper can be reduced. Further, since the second projection has an elastic force and comes into contact with the disk, the second projection urges the first projection in a direction separating from the disk.

Therefore, the contact area between the disk and the disk clamper is small, and the second projection urges the first projection away from the disk, so that sticking between the disk and the disk clamper can be prevented. Thus, the operation of releasing the clamp of the disk by the disk clamper can be reliably performed.

The first projection receives the clamping force of the disk clamper and contacts the disk at at least three places. In addition, since the second projection has an elastic force and comes into contact with the disk, the height of the second projection relative to the disk can have a width up and down around the height of the first projection. For this reason, even if the disk and the disk clamper have a warp or a shape error, at least three first projections and all the second projections can contact the disk. Thus, since the disk can be supported at multiple points by the first projection and the second projection, it is possible to suppress the occurrence of vibration during rotation of the disk.

In the disk clamper of the second aspect, the first projection is formed on a fixed portion of the contact surface and is made of a material which maintains its shape even when it is subjected to a clamping force by the disk held. The disk can be firmly clamped without being pressed by the disk when the one protrusion is clamped on the disk. Further, since the second protrusion is formed on the elastic portion of the contact surface, the elastic portion is deformed when the second protrusion is pushed by the disk. This makes it possible to reliably apply an elastic force to the second projection, thereby suppressing the occurrence of vibration when the disk rotates.

Further, in the disk clamper according to the third aspect, the first projection is formed at three places and the second projection is formed at 3 × n (n is a natural number) places. The same number of second protrusions can be formed between the first protrusions. As a result, the rotational balance of the disk clamper can be improved, so that the occurrence of vibration during disk rotation can be suppressed.

[Brief description of the drawings]

FIG. 1 is a view showing a disc clamper according to the present invention;
(A) is a longitudinal sectional view along the II line of (B), and (B) is a bottom view.

FIG. 2 is a plan view of the disc clamper shown in FIG.

FIG. 3 is a longitudinal sectional view showing a state before clamping by a disk clamper.

FIG. 4 is a longitudinal sectional view showing a state in which the disk clamper is moving.

FIG. 5 is a longitudinal sectional view showing a state after the disk clamper has clamped.

FIG. 6 is a side view showing a state after the disk clamper has clamped.

FIG. 7 is a bottom view showing another embodiment of the disc clamper.

FIG. 8 is a bottom view showing still another embodiment of the disc clamper.

FIG. 9 is a bottom view showing another embodiment of the disc clamper.

FIG. 10 is a bottom view showing still another embodiment of the disc clamper.

FIG. 11 is a bottom view showing an embodiment having no slit of the disk clamper.

FIG. 12 is a bottom view showing another embodiment of the disk clamper having no slit.

FIG. 13 is a longitudinal sectional view showing a conventional disk clamper.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Disc clamper 2 Disk 3 Turntable 4 Contact surface 4a Fixed part 4b Elastic part 5 First protrusion 6 Second protrusion

Claims (3)

[Claims] 1. A disk clamper for holding a disk sandwiched between a turntable and rotating the disk together with the turntable, wherein first projections formed at least at three positions on a contact surface with the disk; A second projection formed between the first projections and projecting toward the disk from the first projection, and being in contact with the held disk with elasticity. A disk clamper characterized in that: 2. The first projection is formed of a material that is formed on a fixed portion of the contact surface and maintains a shape even when subjected to a clamping force by the disc held, and the second projection is formed of the contact surface. 2. The disc clamper according to claim 1, wherein said disc clamper is formed on said elastic portion. 3. The method according to claim 1, wherein the first protrusions are formed at three places, and the second protrusions are formed at 3 × n (n is a natural number) places. Disc clamper according to any of the above.