JP2001256700A - Turntable and optical disk device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a turntable, which is capable of surely correcting the eccentricity of a disk-like information recording medium, when the disk-like information recording medium is mounted on the turntable and which is capable of preventing slippages and an optical disk device. SOLUTION: The turntable has a fixing section 48, which is fitted to an inner peripheral edge forming a center hole H of the disk-like information recording medium D, a movable section 50 which is fitted to the inner peripheral edge on the basis of the fixing section 48 and is thereby deformed elastically, to correct the eccentricity in mounting of the disk-like information recording medium D, a resetting member 60 of the movable section which resets the movable section 50 from the position, where the disk-like information recording medium D is mounted to the position where the disk-like information recording medium D is not mounted, while the disk-like information recording medium D is not mounted and a slippage preventive section 62, which is used to obstruct the slip of the mounted disk-like information recording medium D.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a turntable for mounting and continuously rotating a disc-shaped information recording medium and an optical disc apparatus having the turntable.

[0002]

2. Description of the Related Art A disc-shaped information recording medium (hereinafter referred to as a disc) is, for example, a compact disc (CD).
And DVD (digital versatile disk, digital video disk). This type of optical disc is detachably held on a turntable. FIG. 18 shows a conventional turntable. Turntable 100
0 holds the optical disk D detachably. The center hole 1001 of the optical disc D is
The centering portion 1002 is fixed to the fixed portion 1003 and the movable claw 1004 of the centering portion 1002 to be detachably held. The fixed portion 1003 positions the optical disk D, and the movable claw 1004 has a function of mounting the optical disk D in alignment with the center line CL of the turntable 1000 when the optical disk D is eccentric.

[0003] The centering portion 1002 is a magnet 1
The magnet 1004 magnetically attracts a chucking portion (not shown) to hold the optical disc D on the turntable 1000. A yoke 1005 is provided below the magnet 1004.
Centering part 10 for turntable 1000
02 is fixed by press fitting. Turntable 10
00 is attached to the shaft 1007 of the motor 1006 by press fitting. The movable claw 1004 is a PEI that is unlikely to cause a creep phenomenon in order to prevent the creep phenomenon from occurring when the optical disc D is mounted and not returning to the original state.
A creepless material such as (polyetherimide) is used.

[0004]

However, since such a movable claw 1004 for centering is made of a creepless material, this creepless material is expensive. Even if is provided integrally with the centering portion 1002, a problem occurs in terms of rigidity. The turntable 1000 is a motor 10
Since the center ring portion 1002 is press-fitted into the turntable 1000 and the center ring portion 1002 is press-fitted into the turntable 1000, the center ring portion 1002 does not cause the shaft 1007 to run out, so that it is difficult to achieve assembly accuracy. Moreover, since the centering portion 1002 and the turntable 1000 are separate members, an increase in cost cannot be avoided.

When a creepless material is injection-molded,
Since the temperature of the mold and the resin is high, it is not possible to insert-mold the centering portion 1002 with the magnet 1004 inserted in the mold. Magnet 1 like this
This is because insert molding of 004 causes demagnetization of the magnet. For this reason, the magnet 1004 is fixed by bonding after forming the center ring portion 1002. As described above, the bonding of the magnets 1004 leads to an increase in cost and a problem in reliability in assembling. Further, when the optical disc is mounted on the turntable 2 and continuously rotated, it is necessary to positively prevent the optical disc from slipping with respect to the turntable. Therefore, the present invention solves the above-described problems, and can reliably correct the eccentricity of the disc-shaped information recording medium when the disc-shaped information recording medium is mounted on the turntable, and can prevent the slip. It is an object of the present invention to provide a turntable and an optical disk device that can be used.

[0006]

According to the first aspect of the present invention, a center hole of the disc-shaped information recording medium is formed in a turntable for mounting and continuously rotating the disc-shaped information recording medium. A fixed portion fitted into the inner peripheral edge, a movable portion for correcting eccentricity when the disc-shaped information recording medium is mounted by being elastically deformed by being fitted into the inner peripheral edge with reference to the fixed portion; A movable section for returning the movable section from a position when the disc-shaped information recording medium is mounted to a position when the disc-shaped information recording medium is not mounted when the disc-shaped information recording medium is not mounted; A turntable comprising: a return member; and a slip prevention unit configured to prevent the mounted disc-shaped information recording medium from slipping.

According to the first aspect, the fixed portion is fitted on the inner peripheral surface of the disc-shaped information recording medium which forms the center hole. The movable section corrects eccentricity when a disc-shaped information recording medium is mounted. The return member of the movable portion returns the movable portion from the position where the disk-shaped information recording medium is mounted to the position where the disk-shaped information recording medium is not mounted when the disk-shaped information recording medium is not mounted. It has a function to make it work. The slip prevention unit positively prevents the mounted disc-shaped information recording medium from slipping. Thereby, when the disk-shaped information recording medium is mounted on the turntable, the movable portion can correct the eccentricity of the disk-shaped information recording medium. Moreover, the return member of the movable part
The movable section can be returned from the position where the disc-shaped information recording medium is mounted to the position where the disc-shaped information recording medium is not mounted. Thus, the movable portion can surely correct the eccentricity when the disc-shaped information recording medium is mounted. With the movable member returning member, the portion including the movable portion does not need to use the material of the creepless material for preventing the creep phenomenon unlike the related art, and can use a usual resin, for example. For this reason, since a special material such as a creepless material is not used, the cost can be reduced. The slip prevention unit prevents the mounted disc-shaped information recording medium from slipping.

According to a second aspect of the present invention, in the turntable according to the first aspect, the movable portion is a claw-shaped member,
Plural pieces are arranged at equal angles around the rotation center axis. According to the second aspect, since the plurality of movable parts are arranged at equal angles about the rotation center axis,
Each movable part can surely correct the eccentricity of the disc-shaped information recording medium at any position.

According to a third aspect of the present invention, there is provided the turntable according to the first aspect, further comprising a magnet for attracting a metal of the chucking member, wherein the disc-shaped information recording medium includes the magnet and the chucking member. It is held detachably between them. In claim 3, the magnet of the turntable attracts the metal of the chucking member,
The disc-shaped information recording medium can be detachably held.

According to a fourth aspect of the present invention, in the turntable according to the first aspect, the return member of the movable portion and the slip prevention portion are integrally formed. It is arranged on the side opposite to the side on which the disc-shaped information recording medium is mounted. According to the fourth aspect, the return member of the movable portion and the slip prevention portion are integrated, and the number of components can be reduced.

According to a fifth aspect of the present invention, in the turntable according to the first aspect, the return member of the movable portion and the slip prevention portion are separate objects, and the return member of the movable portion is the disk-shaped information. The slip prevention unit is disposed on a surface opposite to the surface on which the recording medium is mounted, and the slip prevention unit is disposed at a position around the turntable and supporting the disc-shaped information recording medium. According to the fifth aspect, the return member of the movable portion and the slip prevention portion are separate objects. The return member of the movable portion is disposed on the surface opposite to the surface on which the disc-shaped information recording medium is mounted. The slip prevention unit is arranged at a position around the turntable and supporting the disc-shaped information recording medium.

According to a sixth aspect of the present invention, in the turntable according to the fourth aspect, the slip prevention portion is exposed at a hole formed on a surface of the turntable on which the disc-shaped information recording medium is placed. The disk-shaped information recording medium is supported. In claim 6, the slip prevention portion is exposed at a hole formed on the surface of the turntable on which the disc-shaped information recording medium is placed,
It supports a disc-shaped information recording medium.

According to a seventh aspect of the present invention, there is provided an optical disc apparatus having a turntable for mounting and continuously rotating a disc-shaped information recording medium, wherein an inner peripheral edge of the disc-shaped information recording medium forming a center hole is provided. A fixed portion to be fitted, and a movable portion for correcting eccentricity when the disc-shaped information recording medium is mounted by being elastically deformed by being fitted to the inner peripheral edge with reference to the fixed portion,
A movable part that returns the movable part from a position where the disk-shaped information recording medium is mounted to a position where the disk-shaped information recording medium is not mounted when the disk-shaped information recording medium is not mounted. And an anti-slip unit for preventing the mounted disc-shaped information recording medium from slipping.

According to a seventh aspect of the present invention, the fixed portion is fitted on the inner peripheral surface of the disc-shaped information recording medium which forms the center hole. The movable section corrects eccentricity when a disc-shaped information recording medium is mounted. The return member of the movable portion returns the movable portion from the position where the disk-shaped information recording medium is mounted to the position where the disk-shaped information recording medium is not mounted when the disk-shaped information recording medium is not mounted. It has a function to make it work. The slip prevention unit positively prevents the mounted disc-shaped information recording medium from slipping. Thereby, when the disk-shaped information recording medium is mounted on the turntable, the movable portion can correct the eccentricity of the disk-shaped information recording medium. Moreover, the return member of the movable part
The movable section can be returned from the position where the disc-shaped information recording medium is mounted to the position where the disc-shaped information recording medium is not mounted. Thus, the movable portion can surely correct the eccentricity when the disc-shaped information recording medium is mounted. With the movable member returning member, the portion including the movable portion does not need to use the material of the creepless material for preventing the creep phenomenon unlike the related art, and can use a usual resin, for example. For this reason, since a special material such as a creepless material is not used, the cost can be reduced. The slip prevention unit prevents the mounted disc-shaped information recording medium from slipping.

According to an eighth aspect of the present invention, in the optical disk device having the turntable according to the seventh aspect, the movable portion is a claw-shaped member, and a plurality of the movable portions are arranged at an equal angle about a rotation center axis. ing. According to the eighth aspect, since a plurality of movable parts are arranged at equal angles about the rotation center axis, each movable part can surely correct the eccentricity of the disc-shaped information recording medium at any position. Can be.

According to a ninth aspect of the present invention, in the optical disk device having the turntable according to the seventh aspect, there is provided a magnet for attracting a metal of a chucking member, and the disk-shaped information recording medium is provided with the magnet and the magnet. It is detachably held between the chucking members. In claim 9,
The magnet of the turntable can detachably hold the disc-shaped information recording medium by attracting the metal of the chucking member.

According to a tenth aspect of the present invention, in the optical disk device having the turntable according to the seventh aspect, the return member of the movable portion and the slip prevention portion are integrated.
The return member of the movable portion and the slip prevention portion are arranged on a surface opposite to the surface on which the disc-shaped information recording medium is mounted. According to the tenth aspect, the return member of the movable portion and the slip prevention portion are integrally formed, and the number of components can be reduced.

According to an eleventh aspect of the present invention, in the optical disk device having the turntable according to the seventh aspect, the return member of the movable portion and the slip prevention portion are separate objects.
The return member of the movable portion is disposed on a surface side opposite to a surface side on which the disc-shaped information recording medium is mounted, and the slip prevention portion is a peripheral portion of the turntable and is provided with the disc-shaped information. It is arranged at a position supporting the recording medium. In claim 11, the return member of the movable part and the slip prevention part are separate objects. The return member of the movable portion is disposed on the surface opposite to the surface on which the disc-shaped information recording medium is mounted. The slip prevention unit is arranged at a position around the turntable and supporting the disc-shaped information recording medium.

According to a twelfth aspect of the present invention, in the optical disk apparatus having the turntable according to the tenth aspect, the slip prevention portion is provided in a hole formed on a surface of the turntable on which the disk-shaped information recording medium is placed. The disc-shaped information recording medium is supported by being exposed. According to the twelfth aspect, the slip prevention portion is configured to support the disc-shaped information recording medium by being exposed at a hole formed on the surface of the turntable on which the disc-shaped information recording medium is placed.

[0020]

Preferred embodiments of the present invention will be described below in detail with reference to the accompanying drawings. Note that the embodiments described below are preferred specific examples of the present invention,
Although various technically preferable limits are given, the scope of the present invention is not limited to these modes unless otherwise specified in the following description.

FIG. 1 shows a preferred embodiment of the optical disk apparatus of the present invention. The optical disk device 10 is also called a disk device, and has a turntable 12. The turntable 12 rotates continuously by the operation of the motor 14. The turntable 12 detachably holds a disk-shaped information recording medium (hereinafter referred to as an optical disk or a disk) D such as a compact disk or a DVD, and rotates the information recording medium continuously. Although the illustration of the housing of the optical disk device 10 is omitted, a base member 16 is housed in the housing. The base member 16 has a mechanism section 22 that can move and position the optical pickup 20 in the X direction. This mechanism 22
The driving force of the motor 24 is controlled by a plurality of gears 26, 28, 3
The rack 34 can be moved in the X direction or the X1 direction, which is the opposite direction, via the 0 and 32. The movement of the rack 34 causes the optical pickup 20 to move in the X direction or X1 direction.
To move in the direction.

The optical pickup 20 includes the turntable 1
The information recorded on the optical disk D is optically read by, for example, irradiating the reading surface of the optical disk D mounted on the optical disk 2 with a laser beam, or the information is read onto the optical disk D by a laser beam as necessary. Has the ability to write. The optical pickup 20 may be a read-only optical unit that only reads information on the optical disk D as described above, or an optical disk for recording and reproduction that can read information and write information on the optical disk D in reverse. Of course.

FIGS. 2 and 3 show the optical disk drive 10 of FIG.
Of the turntable 12 is shown. The turntable 12 has a center ring portion 40 and a shaft portion 42, and the center ring portion 40 and the shaft portion 42 are integrally formed. For the centering portion 40 and the shaft portion 42, a material such as a normal resin such as polycarbonate can be used. The material of the centering portion 40 and the shaft portion 42 may be any material that does not demagnetize the magnetic force of the magnet 44. The center ring section 40 of the turntable 12 has a receiving section 46, a fixed section 48, and a movable section 50. These receiving portion 46 and fixing portion 48
The movable part 50 is integrally formed by integral molding. The centering portion 40 is, as described above, the shaft portion 42.
However, a hole 42A is formed in the center of the shaft portion 42, and the shaft 1 of the motor 14 is formed in the hole 42A.
4A is fixed by press fitting.

The magnet 44 shown in FIG. 2 is provided in the hole 40A of the center ring 40 by insert molding. The magnet 44 is located at the centering portion 40.
The reason why the insert molding can be performed is that the center ring portion 40 and the shaft portion 42 are not made of a special material which is a conventional creepless material, but are made of a normal resin material. Moreover, the centering part 40 and the shaft part 4
Since 2 does not demagnetize the magnetic force of the magnet 44, the magnet 44 can sufficiently exhibit its own magnetic force.

The chucking section 56 has a metal plate 58. The magnet 44 magnetically attracts the metal plate 58 of the chucking portion 56, and the boss 59 of the chucking portion 56 is fitted into the hole 40C of the centering portion 40, so that the chucking portion 56 turns the optical disc D. It can be chucked by pressing against the receiving portion 46 of the table 12.

As shown in FIGS. 3 to 5, the fixing portion 48 is a circular outer peripheral surface. This fixing portion 48 has a tapered tapered surface 48A. In the fixed part 48, for example, five movable parts 50 are formed at equal intervals. The fixed portion 48 is for fixing the inner peripheral edge H1 of the center hole H of the optical disk D in FIG. That is, it has a function of centering with respect to the rotation center axis CL. For this reason, the movable portion 50 is also called a movable claw and has a function of elastically deforming.

FIG. 3 is a perspective view of the turntable 12. As shown in FIGS. 2 and 3, the return member 60 of the movable portion and the slip prevention portion 62 are integrally formed, and the return member 60 and the slip prevention portion 62 of the movable portion are
For example, it is fixed to the lower side, that is, the back side, by bonding. The return member 60 of the movable portion and the slip prevention portion 62
Is formed of a resin such as an elastomer, for example. The return member 60 of the movable portion and the slip prevention portion 6
Reference numeral 2 also has vibration-proof performance for suppressing vibration generated in the turntable 12. The movable member return member 60 is located inside the movable portion 50. When the optical disc D is mounted on the movable portion 50 as shown in FIG. Is elastically deformed in the R1 direction. However, the optical disk D is
When the movable member 5 is removed from the movable portion 5,
0 is forcibly returned in the direction of R2 in FIG. 2 so as to return to the normal state when the optical disc D shown in FIG. 3 is not mounted.

The reason for providing the movable member return member 60 is that, when the optical disk D is mounted on the turntable 12 as shown in FIG. The movable part 50 may not be able to return to the original state shown in FIG. 3 due to a creep phenomenon. If the movable unit 50 cannot return to the original state, the movable unit 50 corrects the eccentricity of the optical disc D,
That is, centering cannot be performed. Accordingly, the movable member return member 60 always returns the movable portion 50 in the direction of R2 shown in FIG. 3 when the optical disk D is removed. From this, the movable part 50
The centering portion 40 including is not a conventional expensive material having a creepless function, but a normal resin,
For example, it can be made using polycarbonate, and cost can be reduced. Thus, the center ring portion 40 of the turntable 12 can be made of a normal resin or the like. For this purpose, the magnet 44 may be inserted when the center ring portion 40 is formed, and may be formed using any resin material as long as the material does not demagnetize the magnetic force of the magnet 44. .

As shown in FIG. 2 and FIG.
2 has a substantially inverted U-shape in cross section, and each anti-slip portion 62 projects from a circular hole formed in the receiving portion 46 of the turntable 12 toward the upper surface of the receiving portion 46. ing. As shown in FIGS. 5 and 6, five holes 99 of the receiving portion 46 are formed at equal intervals along the circumferential direction of the turntable 12. As shown in FIGS. 2 and 3, the upper surface 62 </ b> A of each slip prevention portion 62 is
Slightly protrude from the upper surface 46A of the. This upper surface 62A
Supports the lower surface of the optical disk D with a frictional force so that the optical disk D does not slip with respect to the turntable 12 when rotating.

FIG. 4 shows the centering portion 40 and the receiving portion 46 in the turntable 12, but the return member 60 of the movable portion and the slip prevention portion 62 are not shown.

FIGS. 7 and 8 show a state after the return member 60 of the movable portion and the slip prevention portion 62 are formed on the back side of the centering portion 40. FIG. FIG. 8 is a plan view of the turntable of FIG. 7, and FIG. 9 is a rear view of the turntable of FIG.

Next, an operation example of the optical disk device 10 having the above-described turntable will be described. In FIG. 2, the optical disk D is placed on the receiving portion 46 of the turntable 12, and the optical disk D is mounted. Each movable part 5
The outer diameter of 0 is made slightly larger than the standard value of the inner diameter of the center hole H of the optical disc D in advance, and the movable section 50 is formed so that the movable section 50 can center the optical disc D properly. In this case, the movable portion 50 itself is formed so as not to be eccentric with respect to the rotation center axis CL.

As shown in FIG. 3, when the optical disk D is not mounted on the turntable 12, the movable portion 50 is held at a correct position. When the optical disc D is mounted on the receiving portion 46 of the turntable 12 as shown in FIG.
Push in one direction. The movable unit 50 corrects the eccentric state of the optical disc D about the rotation center axis CL, that is, performs centering.

The optical disk D has a long turntable 12
Even if the optical disk D is detached from the turntable 12 even if the optical disk D is mounted on the turntable 12 or not for a short period of time, the movable part 50 is moved in the direction of R2 in FIG. Is forcibly mechanically restored. Thus, the movable section 50 can return to the correct position shown in FIG. Therefore, when the next optical disc D is mounted on the turntable 12, the movable part 50
Can correctly center the optical disc D.

The slip prevention unit 62 shown in FIGS.
When the optical disk D is mounted on the receiving portion 46 and continuously rotates, the lower surface of the optical disk D is reliably held by the frictional force. For this reason, when the optical disc D is rotated at a high speed, a phenomenon that the optical disc D slips with respect to the turntable 12 does not occur. That is, the optical disc D
Are the upper surfaces (friction surfaces) 6 of the five anti-slip portions 62.
2A, and the frictional force can prevent the optical disc D from slipping. In addition, the slip prevention portion 62 is formed in a substantially U-shaped cross section as described above, and the slip prevention portion 62 itself can be elastically deformed in accordance with the position of the lower surface of the optical disc D. Can be brought into close contact with the lower surface of the optical disc D.

FIG. 10 shows an example of forming the turntable 12 of FIG. First, the centering part 4
The 0 and the shaft 42 are formed using a fixed mold and a movable mold (not shown). At this time, the magnet 44 is disposed in the mold, and the centering portion 40 and the shaft portion 42 are integrally formed with the magnet 44 inserted. As a material of the centering portion 40 and the shaft portion 42, for example, a normal resin, for example, inexpensive polycarbonate or the like can be used.

Next, as shown in FIG.
The center ring portion 40 and the shaft portion 42 that have already been formed are arranged in the movable die 400. Then, by injecting the resin 450, the return member 60 of the movable portion and the slip prevention portion 62 are integrally formed on the back surface side of the centering portion 40. Turntable 12 obtained in this way
After molding the centering part 40 and the shaft part 42,
It is made by so-called double molding in which a movable member 60 and a slip prevention part 62 are molded. The return member 60 of the movable portion and the slip prevention portion 62 are integrated, and use, for example, an elastomer that is strong against creep.

FIGS. 11 to 14 show another embodiment of the turntable of the present invention. The turntable 12 of FIGS. 11 to 14 is basically similar to the turntable 12 of the embodiment shown in FIG. 3, but the return member 60 of the movable portion and the slip prevention portion 162 are separate bodies. The points are different. Other magnet 44, centering part 40,
The structure of the shaft 42 is substantially the same as the magnet 44, the center ring 40, and the shaft 42 of the turntable in FIG. However, the structure of the receiving portion 146 is slightly different, and the receiving portion 146 has, for example, five protruding portions 146A as shown in FIGS. The protrusions 146A are formed at equal intervals in the circumferential direction.

On the other hand, the adjacent protrusions 146A, 1
46A, as shown in FIG.
62 are formed. As a result, the protrusions 146A and the slip prevention portions 162 are alternately formed in the receiving portion 146 along the circumferential direction. The movable portion return member 60 for the movable portion 50 is formed in a substantially ring shape inside the center ring portion 40. That is, the movable member return member 60 is formed in a ring shape around the shaft portion 42. The function of the movable member return member 60 for preventing the movable portion 50 from creeping is the same as in the embodiment of FIG. Although the return member 60 of the movable portion and the slip prevention portion 162 are separate bodies, they are formed using, for example, an elastomer that is strong against creep. Alternatively, the return member 60 of the movable portion
However, the anti-slip portion 162 may be made of another material. In the embodiment of FIGS. 11 to 14, the return member 60 of the movable portion and the slip prevention portion 162 are separate as described above, and in particular, the return member 60 of the movable portion in the embodiment of FIG. And slip prevention part 6
This is different from the structure of FIG.

FIGS. 15 to 17 show still another embodiment of the turntable of the present invention. The receiving portion 246 of the turntable 12 has, for example, five concave portions 246A as shown in FIG. An anti-slip portion 262 is formed in each recess 246A. The movable member return member 60 has the same shape as the movable member return member 60 in FIGS. 3 and 11.

The conventional turntable uses a creepless material as a separate part for the centering portion to correct the eccentricity of the optical disk. Therefore, the turntable is expensive and it is difficult to obtain the accuracy in assembling. Further, in order to prevent slippage of the conventional optical disk, a member having a high friction coefficient is attached to the turntable later by coating or packing.
Therefore, it is similarly expensive and poses a problem in accuracy. In the present invention, these problems are solved, and the turntable is provided with both the eccentricity correction of the optical disc and the slip prevention function,
It can be created at low cost.

A material having excellent rigidity and dimensional accuracy is used for the basic shape portion of the turntable, and a material having elasticity and strong against creep is selected for a support portion of the movable portion for preventing creep and a portion requiring friction. This is formed by double molding. The return member of the movable portion and the slip prevention portion are elastic and have a large anti-vibration effect against resonance of the optical disk.
In terms of design, the colors of the return member and the slip prevention portion of the movable portion of the turntable and the color of the other turntable portions (substrate-shaped portions) can be changed, which improves the appearance.
The return member of the movable part and the slip prevention part are colored,
The other part of the turntable can be made into a skeleton, into which a magnet can be inserted and molded, resulting in an interesting design. The magnet can also be inserted at the same time, which is advantageous in cost and reliability (such as dimensional accuracy and peel strength with respect to post-adhesion).

The slip prevention unit 6 of the turntable of FIG.
2 is a slip prevention part 162 of the turntable of FIG.
In contrast, the precision of the surface deflection of the optical disc D is not required to be severe. Since the surface of the slip prevention portion 62 in FIG. 3 which comes into contact with the optical disk is formed higher than the outer peripheral surface of the turntable (the surface that defines the height and surface deflection of the optical disk), elasticity such as rubber of an elastomer is obtained. By utilizing this, it is in close contact with the optical disk surface, and its frictional force has a greater slip prevention effect than a turntable made of a normal material.

In the turntables of FIGS. 3 and 11,
Both can be double molded. In the turntable of FIG. 11, the return member of the movable portion and the slip prevention portion may be integrally formed, or in the turntable of FIG. 3, the return member of the movable portion and the slip prevention portion may be separate members. . After the molding, the return member of the movable portion and the slip prevention portion are held in close contact with the turntable. The hardness of the return member of the movable portion and the hardness of the slip prevention portion are selected in consideration of the spring force of the movable portion and the frictional force between the movable portion and the optical disk surface.

On the turntable, a plurality of fixed portions or fixed diameter portions corresponding to the center holes of the optical disc and a plurality of movable portions are formed. The fixed part is the center hole 4 of the turntable that fits with the motor shaft that is the rotation center.
The eccentricity is suppressed based on 2A, and it is made with an appropriate diameter. However, in the case of mass production, this center hole 42A
There is also a tolerance in the diameter of Also, there is a tolerance in the center hole of the optical disk, and a variation (play) occurs between the turntable and the optical disk, which causes a problem as eccentricity of the optical disk. Therefore, in the present invention, a return member for the movable portion is provided to correct the problem. The movable part is slightly larger than the standard diameter of the center hole of the optical disc,
In addition, the eccentricity is suppressed. As a result, the optical disk is centered when it is mounted on the turntable, and there is no play caused by only the fixed portion, and the eccentricity is corrected.

In the embodiment of the present invention, the magnet is inserted when the turntable is formed, and in this state, the turntable is formed by insert molding. However, the present invention is not limited to this, and the magnet may be fixed to the hole of the turntable later by bonding or the like.

The present invention is not limited to the above embodiment. In the above-described embodiment, the disc-shaped information recording medium is, for example, an optical disc. However, the disc-shaped information recording medium is not limited to the optical disc, but may be a magneto-optical disc or another disc-shaped information recording medium. . Also, among the optical disks, compact disks (C
In addition to D), a CD-ROM (read-only compact disc), a CD-R (re-writable compact disc) or the like may be used.

[0048]

As described above, according to the present invention,
When the disc-shaped information recording medium is mounted on the turntable, the eccentricity of the disc-shaped information recording medium can be surely corrected, and slip can be prevented.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a preferred embodiment of an optical disk device having a turntable according to the present invention.

FIG. 2 is a sectional view showing a structural example of the turntable of FIG. 1;

FIG. 3 is a perspective view having a cross section showing the structure of the turntable of FIG. 2;

FIG. 4 is a sectional view showing a center ring portion, a shaft portion, and the like of the turntable of FIG. 3;

FIG. 5 is a plan view of the turntable of FIG. 4;

FIG. 6 is a back view of the turntable.

FIG. 7 is a sectional view of a turntable.

FIG. 8 is a plan view of the turntable of FIG. 7;

FIG. 9 is a back view of the turntable of FIG. 7;

FIG. 10 is a diagram showing a molding example of a turntable.

FIG. 11 is a perspective view having a cross section showing another embodiment of the turntable of the present invention.

FIG. 12 is a sectional view showing a center ring, a shaft portion, and the like of the turntable.

FIG. 13 is a plan view of the turntable of FIG. 12;

FIG. 14 is a back view of the turntable of FIG. 12;

FIG. 15 is a sectional view showing a turntable according to still another embodiment of the present invention.

FIG. 16 is a plan view of the turntable of FIG. 15;

FIG. 17 is a back view of the turntable of FIG. 15;

FIG. 18 is a sectional view showing an example of a conventional turntable.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 10 ... Optical disk apparatus, 12 ... Turntable, 40 ... Centering part, 42 ... Shaft part, 4
4 ... magnet, 46 ... receiving part, 50 ... movable part, 60 ... return member of movable part, 62 ... slip prevention part, D ... optical disk

Claims (12)

[Claims] 1. A turntable for mounting and continuously rotating a disc-shaped information recording medium, comprising: a fixed portion fitted to an inner peripheral edge of a center hole of the disc-shaped information recording medium; A movable part for correcting eccentricity at the time of mounting the disc-shaped information recording medium by being elastically deformed by being fitted into the inner peripheral edge with respect to the part, when the disc-shaped information recording medium is not mounted, A return member of a movable section for returning the movable section from a position where the disc-shaped information recording medium is mounted to a position where the disc-shaped information recording medium is not mounted; and And a slip prevention unit for preventing the information recording medium from slipping. 2. The turntable according to claim 1, wherein the movable section is a claw-shaped member, and a plurality of the movable sections are arranged at an equal angle about a rotation center axis. 3. The turn according to claim 1, further comprising a magnet for attracting a metal of the chucking member, wherein the disc-shaped information recording medium is detachably held between the magnet and the chucking member. table. 4. The return member of the movable portion and the slip prevention portion are integrally formed, and the return member of the movable portion and the slip prevention portion are different from a surface on which the disc-shaped information recording medium is mounted. The turntable according to claim 1, wherein the turntable is disposed on an opposite surface side. 5. The return member of the movable portion and the slip prevention portion are separate objects, and the return member of the movable portion is on a surface opposite to the surface on which the disc-shaped information recording medium is mounted. 2. The turntable according to claim 1, wherein the slip prevention unit is disposed at a position surrounding the turntable and supporting the disc-shaped information recording medium. 3. 6. The disc-shaped information recording medium is supported by being exposed at a hole formed in a surface of the turntable on which the disc-shaped information recording medium is placed. Turntable described in. 7. An optical disc apparatus having a turntable for mounting and continuously rotating a disc-shaped information recording medium, wherein a fixed portion is fitted to an inner peripheral edge of the disc-shaped information recording medium which forms a center hole. A movable portion for correcting eccentricity when the disc-shaped information recording medium is mounted by being fitted into the inner peripheral edge with respect to the fixed portion and elastically deforming the disc-shaped information recording medium; A return member of a movable unit that returns the movable unit from a position where the disc-shaped information recording medium is mounted to a position where the disc-shaped information recording medium is not mounted when the disc-shaped information recording medium is mounted; An optical disc having a turntable, comprising: a slip prevention unit for preventing the disc-shaped information recording medium from slipping. Device. 8. The optical disk device having a turntable according to claim 7, wherein said movable portion is a claw-shaped member, and a plurality of said movable portions are arranged at an equal angle around a rotation center axis. 9. The turn according to claim 7, further comprising a magnet for attracting a metal of the chucking member, wherein the disc-shaped information recording medium is detachably held between the magnet and the chucking member. An optical disk device having a table. 10. The return member of the movable portion and the slip prevention portion are integrally formed, and the return member of the movable portion and the slip prevention portion are in contact with the surface on which the disc-shaped information recording medium is mounted. 8. The device according to claim 7, which is disposed on an opposite surface side.
An optical disc device having the turntable according to claim 1. 11. The return member of the movable portion and the slip prevention portion are separate objects, and the return member of the movable portion is on a surface opposite to the surface on which the disc-shaped information recording medium is mounted. The optical disc device having a turntable according to claim 7, wherein the slip prevention unit is arranged at a position around the turntable and supporting the disc-shaped information recording medium. 12. The slip prevention section supports the disc-shaped information recording medium by being exposed at a hole formed on a surface of the turntable on which the disc-shaped information recording medium is placed. An optical disc device having the turntable according to claim 1.