JPH10302359A - Clamp device for optical disk player - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent a lower warpage of a 1st optical disk having a smaller center hole diameter in the device for holding and rotating two kinds of optical disks having different center hole diameters. SOLUTION: An outside diameter of a CD centering projection part 45 of a centripetal guide 42 is formed smaller than the diameter of the center hole 62 of the CD 61 by 1/100 mm to 5/100 mm, and the centered CD 61 is supported on the upper surface of a plate-like part 44 of the centripetal guide 42, and moreover, a 2nd pressor part 60 for pressing the CD 61 from the upper side on the surface of the plate-like part 44 of this centripetal guide 42 is provided on a clamper 57.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a clamp device for an optical disk player that holds and rotates an optical disk, and more particularly, to a clamp device that can hold two types of optical disks having different diameters of center holes.

[0002]

2. Description of the Related Art Compact disks (hereinafter, referred to as CDs) and laser disks (hereinafter, referred to as LDs) are known as optical disks. The diameter of the center hole differs between the CD and LD. <The diameter of the center hole of the LD. Therefore, a CD /
A clamp device used for an LD compatible player to hold and rotate an optical disk must be able to hold and rotate both a CD and an LD having different diameters of center holes. Conventional examples of such a clamping device are shown in FIGS.

In FIG. 3 to FIG. 5, reference numeral 11 denotes a vertically provided rotating shaft, and a centripetal guide 12 is fitted to the upper end thereof so as to be vertically movable. The centering guide 12 includes a cylindrical portion 13 fitted to the rotating shaft 11 and a circular plate-shaped portion 14 extending outward from the upper end of the cylindrical portion 13.
A cylindrical projection 15 is provided as a CD centripetal portion on the inner peripheral upper surface of the. The protrusion 15 has a tapered outer surface and is fitted into the center hole 32 of the CD 31 from the upper end to the middle thereof as shown in FIG. Get out. Further, the plate-like portion 14
Has a tapered surface 16 which curves downward and has an outer surface serving as a centripetal portion of the LD. This tapered surface 16 is shown in FIG.
As shown in the figure, the LD 33 is fitted into the center hole 34 of the LD 33 from the upper end to the middle, and abuts the center hole edge of the LD 33 in the middle to
The center of 33 is set.

A turntable 1 is provided at the lower end of the rotating shaft 11.
7 is fitted. This turntable 17 has a rotating shaft 1
1 and a widened portion 19 extending from the upper end of the cylindrical portion 18 to cover the outside and underside of the centripetal guide 12, and the outer peripheral end of the widened portion 19 is
CD and LD positioned horizontally outside the second plate-shaped portion 14
Support portion 20. An elastic sheet 2 for preventing slippage of CD and LD is provided on the upper surface of the support portion 20.
1. Specifically, a rubber sheet is attached.

[0005] A compression coil spring 22 is interposed between the root portion of the spread portion 19 of the turntable 17 and the root portion of the plate-like portion 14 of the centripetal guide 12. Although a force is applied, a tongue-shaped stopper 23 is provided at the root of the plate-shaped portion 14 of the centripetal guide 12 and a hook 24 at the lower end of the stopper 23 is turned as shown in FIG. The upper limit of the vertical movement of the centripetal guide 12 is determined by abutting on the lower surface of the intermediate portion of the expanding portion 19 of 17. A slit 25 is formed in a vertical portion of the expanding portion 19 of the turntable 17 so as to allow the hook portion 24 of the stopper 23 to extend outward and move up and down.

[0006] Centripetal guide 12 and turntable 17
Above is provided a clamper 26 which is pressed from above by a spring (not shown) and held at a fixed position.
The clamper 26 is formed in a dish shape, and a cylindrical portion 27 is provided at the center of the bottom surface of the concave bottom to which the upper end of the rotating shaft 11 is fitted when the rotating shaft 11 is raised. Further, the lower surface of the outer peripheral end of the bottom is a flat pressing portion 28 that sandwiches the CD or LD from above and below with the supporting portion 20 at the outer peripheral end of the turntable 17.

The operation of such a clamp device will be described. An optical disk, for example, a CD 31 is placed on a tray (not shown), and as shown in FIG.
6 is conveyed. Then, the lower mechanism section including the rotating shaft 11, the centripetal guide 12, and the turntable 17 moves up as shown by the arrow in FIG. Then, the protrusion 1 provided on the inner peripheral side upper surface of the plate-shaped portion 14 of the centering guide 12
4 is fitted into the center hole 32 of the CD 31 from the upper end to the middle, as shown in FIG.
And the center of the CD 31 is centered.

After that, the lower mechanism further rises. Therefore, the CD 31 is integrally raised, and the upper surface of the CD 31 contacts the pressing portion 28 on the lower surface of the bottom outer peripheral end of the clamper 26, and the CD 31 is pressed by the pressing portion 28 from above. Thereafter, the rotating shaft 11 of the lower
Then, the turntable 17 compresses the compression coil spring 22 and rises. As a result, the support portion 20 at the outer peripheral end of the spread portion 19 of the turntable 17 comes into contact with the lower surface of the CD 31, and C
D31 is supported from below, and at the same time, the supporting portion 20 is supported.
Then, the CD 31 is clamped from above and below by the holding portion 28 of the clamper 26. The rotation shaft 11 rotates in such a state, that is, the state of FIG.
2. The turntable 17, the clamper 26, and the CD 31 rotate.

The above description is for the case of CD31.
LD33 is placed on the tray in place of
When the lower mechanism is lifted, the tapered surface 16 at the outer peripheral end of the plate portion 14 of the centering guide 12 is partially moved to the center hole 34 of the LD 33 as shown in FIG. , And the tapered surface 16 is
And the center of the LD 33 is performed. Other operations are the same as those of the case of the CD 31. After the centering, the LD 33 is sandwiched from above and below by the holding portion 28 of the clamper 26 and the supporting portion 20 of the turntable 17, and is integrally rotated by the rotation of the rotating shaft 11.

[0010]

However, in the conventional clamping device as described above, as shown in FIG.
1 is pushed up from below by the projection 13 of the centripetal guide 12 by the force of the compression coil spring 22, while the CD is located at a position that is far away from the pushed up center.
The CD 31 is pressed from above by a clamper 26, and the CD 31 is easily deformed so that the easily deformable elastic sheet 21 is attached to the support portion 20 of the turntable 17 supporting the lower surface side of the CD 31 at the holding portion and sinks. For this reason, there is a problem that the CD 31 is warped as shown in the figure. When the CD 31 warps downward, the CD 31
The signal reading performance of the device decreased. The compression coil spring 2
2 can reduce the warpage of the CD 31, but in that case, as shown in FIG.
When the centering LD 33 is lifted with the centering guide 12 when the centered LD 33 is lifted together with the centering guide 12, the centering guide 12 shifts downward due to the weight of the LD 33.
The holding operation of D33 is hindered.

[0011]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention provides a method of centering a rotating shaft and a first optical disk held by the rotating shaft and having a small center hole. A centripetal guide having a plate-like portion having a second centripetal portion for centering the first centripetal portion and a second optical disk having a large diameter of the center hole; and the first and second centripetal guides held by the rotation shaft. An optical disc player comprising: a turntable that supports the optical disc from below; and a clamper that is provided above the turntable and the centripetal guide and presses the first and second optical discs from above. The first centripetal portion of the guide is formed smaller than the diameter of the center hole of the first optical disc, and the centered first optical disc is placed in the plate-like portion of the centripetal guide. And supported on the upper surface, further a clamping apparatus for an optical disc player, wherein a pressing portion for pressing from above the first disc is provided on the clamper on the plane of the plate-like portion of the centering guide.

Here, the first centering portion of the centering guide is the first centering portion.
1/100 to 5/1 with respect to the diameter of the center hole of the optical disk
It may be formed to be smaller by 00 mm. Further, the first centering portion of the centering guide may be a centering portion for the compact disk, and the second centering portion of the centering guide may be a centering portion for the laser disk.

[0013]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view showing an embodiment of a clamp device for an optical disk player according to the present invention; 1 and 2 show an embodiment of a clamping device for an optical disk player according to the present invention.
FIG. 2 is a sectional view showing a state where a CD is held, and FIG. 2 is a state showing a state where an LD is held. In these figures, reference numeral 41 denotes a vertically provided rotating shaft, and a centripetal guide 42 is fitted to the upper end side so as to be vertically movable. The centering guide 42 includes a cylindrical portion 43 fitted to the rotating shaft 41 and a circular plate-shaped portion 44 extending outward from the upper end of the cylindrical portion 43.
A cylindrical projection 45 is provided as a CD centripetal portion on the inner peripheral side upper surface of the. The projection 45 has a tapered surface from the upper end to the middle so as to be easily fitted into the center hole 62 of the CD 61, but has a vertical surface from the middle. The outer diameter of the projecting portion 45 is the largest in the vertical surface portion, and also in this portion, the diameter of the center hole 62 of the CD 61 is 1/100 to 5/100 mm (10 to 50 μm).
It is formed small. Therefore, when the projection 45 is fitted into the center hole 62 of the CD 61 as shown in FIG.
2, the centered CD 61 is supported on the upper surface of the plate portion 44 of the centering guide 42.

The outer peripheral end of the plate portion 44 is curved downward, and the outer surface is a tapered surface 46 as a center portion of the LD. The tapered surface 46 is fitted into the center hole 64 of the LD 63 from the upper end to the middle as shown in FIG. 2, and contacts the edge of the center hole of the LD 63 in the middle to center the LD 63. In the middle of the upper surface of the plate-like portion 44, a recess 47 is formed as an escape groove for a second pressing portion 60 of a clamper 57 described later.
Are formed.

A turntable 4 is provided at the lower end of the rotating shaft 41.
8 is fitted. This turntable 48 has a rotating shaft 4
1 and a widened portion 50 extending from the upper end of the cylindrical portion 49 to cover the outside and the lower side of the centripetal guide 42. The outer peripheral end of the widened portion 50 is
CD and LD positioned horizontally outside the second plate-shaped portion 44
Support portion 51. An elastic sheet 5 for preventing slippage of CD and LD is provided on the upper surface of the support portion 51.
2. Specifically, a rubber sheet is attached.

A compression coil spring 53 is interposed between the root portion of the spread portion 50 of the turntable 48 and the root portion of the plate-shaped portion 44 of the centripetal guide 42. The compression coil spring 53 causes the centripetal guide 42 to move upward. Although a force is applied, a tongue-shaped stopper 54 is provided at the base of the plate-shaped portion 44 of the centripetal guide 42 so as to hang down. The upper limit of the vertical movement of the centripetal guide 42 is determined by contacting the lower surface of the intermediate portion. A stopper 5 is provided at a vertical portion of the spread portion 50 of the turntable 48.
A slit 56 is formed to allow the hook portion 55 of 4 to extend outward and to be vertically movable.

Centering guide 42 and turntable 48
Above is provided a clamper 57 which is pressed from above by a spring (not shown) and held at a fixed position.
The clamper 57 is formed in a dish shape, and is provided with a cylindrical portion 58 in which the upper end of the rotating shaft 41 is fitted when the rotating shaft 41 rises as shown in the figure at the center of the concave bottom surface. Further, the lower surface of the outer peripheral end of the bottom is CD or LD between the outer peripheral end of the turntable 48 and the supporting portion 51 of the outer peripheral end.
Is formed as a flat holding portion (hereinafter, referred to as a first holding portion) 59 which sandwiches from above and below. Further, on the lower surface of the bottom portion, the CD 6 is located on the intermediate portion of the plate portion 44 of the centripetal guide 42.
The second holding part 60 for holding the first from above is the rotating shaft 4.
It is formed in an annular shape concentrically with 1.

In the clamp device as described above, the projection 4 for centering the CD of the centering guide 42 as described above is used.
5 is formed smaller than the diameter of the center hole 62 of the CD 61. Therefore, the protrusion 45 is located in the center hole 6
When the center of the CD 61 is fitted by fitting
5 is fitted to the center hole 62 of the CD 61 up to the lower end as shown in FIG.
D61 is supported on the upper surface of the plate portion 44 of the centering guide 42.

In the above-mentioned clamping device, the clamper 5
7, a second pressing portion 60 is provided on an intermediate portion of the plate portion 44 of the centripetal guide 42 on the bottom lower surface. Therefore, after the centering of the CD 61 is performed as described above, the CD 61 rises integrally with the centripetal guide 42, and the C 61
When D61 is pressed from above by the clamper 57, the C
D61 is turned by the first holding portion 59 of the clamper 57.
The support 48 is pressed from above by the support portion 51 of the table 48, and is pressed from above by the second pressing portion 60 on the plate-like portion 44 of the centripetal guide 42, and the second pressing portion 60 and the centripetal guide are pressed. CD 61 by the plate-shaped portion 44
Are clamped from above and below.

Then, the CD 61 is moved to the center 42
The plate 61 is supported on the upper surface thereof, and the CD 61 is pressed from above by the second pressing portion 60 of the clamper 57 in the plane of the plate 44, so that the compression coil spring 53 applies the force to the center hole of the CD 61. Even if force is applied upward, CD
61 does not warp, and the signal reading performance of the CD 61 is improved.

In this clamping device, the LD6
The centering and holding operation of No. 3 is performed in exactly the same manner as in the conventional apparatus as shown in FIG. The description is omitted.

In this clamping device,
Assuming that the outer diameter of the protrusion 45 for centering the CD is smaller than the diameter of the center hole 62 of the CD 61 by 50 μm.
Has a maximum eccentricity of 50 μm. Therefore, the difference between the outer diameter of the protrusion 45 and the diameter of the center hole 62 of the CD 61 is preferably small in the sense of reducing the eccentricity, and is suitably about 10 μm, but if the difference is about 50 μm and the eccentricity is about 50 μm, For example, there is no effect on the signal reading operation of the CD by the optical head.

The CD 61 provided on the clamper 57
The second pressing portion 60 that presses the upper surface of the
It may be provided anywhere as long as it is on the surface of the plate-shaped portion 44, and the width and the like can be set as appropriate. Further, in the embodiment, the second holding portion 60 is provided in an annular shape. However, various modifications such as a plurality of arc shapes or a plurality of inside and outside portions are conceivable.

The outer diameter of the CD is 12 cm or 8 cm.
In this specification, these are considered as one type of CD. Further, there are also LDs having an outer diameter of 30 cm and 20 cm, a double-sided type, a single-sided type, and the like, and these are all considered to be one type of LD. Further, the optical disk held and rotated by the clamp device may be a DVD (digital video disk) other than the LD and the CD.

[0025]

As described in detail above, according to the optical disk player clamping device of the present invention, the first optical disk having a small diameter of the center hole can be prevented from warping, and the signal of the first optical disk can be prevented. Reading performance can be improved.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing an embodiment of a clamp device of an optical disk player according to the present invention, showing a state where a CD is held.

FIG. 2 is a cross-sectional view showing the embodiment of the clamping device of the optical disk player according to the present invention, showing a state where an LD is held.

FIG. 3 is a cross-sectional view showing a conventional optical disk player clamping device.

FIG. 4 is a cross-sectional view showing a clamp device of a conventional optical disc player, showing a state where a CD is held.

FIG. 5 is a cross-sectional view showing a conventional clamp device of an optical disk player and showing a state where an LD is held.

[Explanation of symbols]

 41 Rotary shaft 42 Centering guide 44 Plate portion 45 Projection 46 Tapered surface 48 Turntable 57 Clamper 60 Second holding portion 61 CD 62 Center hole 63 LD 64 Center hole

Claims (3)

[Claims] The present invention relates to a rotating shaft, a first centripetal portion centered on a first optical disk held by the rotating shaft and having a small center hole diameter, and a second optical disk having a large center hole diameter. A centering guide having a second centering portion on the plate portion for centering, a turntable held on the rotation shaft and supporting the first and second optical disks from below, and a turntable and the turntable; And a clamper provided above the centering guide and holding the first and second optical disks from above. A clamp device for an optical disk player, wherein the first centering portion of the centering guide is formed in a center hole of the first optical disk. The first optical disc, which is formed smaller than the diameter of the centering guide, is supported on the upper surface of the plate portion of the centering guide. Clamping apparatus for an optical disc player, wherein a pressing portion for pressing from above is provided on the clamper the Oite the first optical disk. 2. The clamping device for an optical disk player according to claim 1, wherein the first centripetal portion of the centripetal guide is 1/100 to 5/5 with respect to the diameter of the center hole of the first optical disk.
An optical disk player clamping device formed to be 100 mm smaller. 3. The clamping device for an optical disk player according to claim 1, wherein the first centering portion of the centering guide is a centering portion for the compact disk, and the second centering portion of the centering guide is a centering portion for the laser disk. An optical disk player clamping device, comprising: