JPH0785555A - Disk chucking device - Google Patents

Abstract

PURPOSE:To prevent the occurrence of a chucking error and also to prevent the device from upsizing in the heightwise direction. CONSTITUTION:An inner circumferential periphery on the back side of a disk center ring 30 is provided with plural extension parts 33 in parallel at prescribed intervals in the circumferential direction. A through hole 25 which extension parts 33 face to is provided on a disk table 22. Thus, since the extension parts 33 of the disk center ring 30 can be escaped along an inner circumferential surface 25a of the through hole 25 to the back side of the disk table 22, an incline of a disk mounting part of the disk center ring 30 is not large, so that a disk center ring can be exhibited enough in function. Then, because of the fact that the extension parts 33 can be escaped to the back side of the disk table 22, the size of the disk table in the heightwise direction can be set to the present size.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a disc chucking device suitable for use in a disc device such as a CD player or a CD-ROM drive.

[0002]

2. Description of the Related Art Generally, an optical disk device is known which includes an optical pickup device which is moved forward and backward by a feed drive motor and a disk table (turntable) which is rotationally driven by a spindle motor.

In such an optical disc device,
An optical disk for recording and / or reproducing, such as a CD or a CD-ROM, is mounted on the disk table for rotational operation, and the optical pickup device is run in the radial direction of the optical disk to emit a beam from the optical pickup device. Is vertically irradiated onto the optical disc from below to perform a recording tracking operation, and a predetermined information signal recorded on the recording track is read and reproduced.

By the way, in this type of optical disc apparatus, when mounting the optical disc on the disc table (disc chucking), the optical disc is placed on the disc table, and the disc clamper is attracted to the disc table side by a chucking magnet. It is done by doing.

For this reason, an optical disc device having a disc chucking device as shown in FIG. 6 has been conventionally used.

This disk chucking device will be described with reference to the same figure. In the figure, reference numeral 1 is a spindle motor having a motor shaft 1a protruding upward, and a mechanical deck (not shown) for a CD player. ) Is fixed.

Reference numeral 2 denotes a disk table having a central hole 2a opened on both front and back surfaces, which is fixed to the tip of the motor shaft 1a and is configured to be rotated at a high speed by the spindle motor 1.

The disk table 2 is integrally provided with a cylindrical boss 3 projecting from the front opening edge of the center hole 2a and a cylindrical guide rib 4 extending around the boss 3.

Reference numeral 5 denotes a metal chucking yoke, which is an annular plate 6 having two inner and outer peripheral walls 6a and 6b which are in contact with the outer peripheral surface of the boss 3 and the inner peripheral surface of the guide rib 4, respectively.
Of the inner and outer peripheral walls 6a and 6b of the annular plate 6, the outer peripheral wall 6b
The horizontal portion 7a and the inclined portion 7b are integrally provided on the outer peripheral surface of the
And a yoke flange 7 having the above, and is fixed on the surface of the disk table 2.

Reference numeral 8 denotes an annular chucking magnet, which faces the inner and outer peripheral walls 6a and 6b and is bonded onto the annular plate 6 of the chucking yoke 5. The chucking magnet 8 is formed by magnet rings whose upper and lower ends are magnetized into N and S poles.

Reference numeral 9 denotes a plastic disk center ring, which is a cylindrical body 10 facing the outer peripheral surface of the guide rib 4.
And the horizontal portion 11 integrally provided on the outer peripheral surface of the cylindrical body 10.
It is composed of a ring flange 11 having a and an inclined portion 11b, and is provided so as to be movable back and forth between an end surface of the yoke flange 7 on the flange back side and the surface of the disk table 2.

Reference numeral 12 is a conical compression coil spring,
It is provided around the cylindrical body 10 and is elastically mounted between the horizontal portion 11 a of the ring flange 11 and the surface of the disc table 2.

Reference numeral 13 denotes a disk clamper having a yoke 13a facing the upper surface of the chucking magnet 8 at the center thereof when the disk is chucked, and is movably provided above the disk table 2.

Reference numeral 14 is an optical disk having a disk center hole 14a opened on both front and back surfaces.

Reference numerals M ₁ and M ₂ in the figure are magnetic circuits formed by the chucking yoke 5, the chucking magnet 8, the yoke 13a of the disk clamper 13, and the like.

In the disk chucking device having the above structure, the optical disk 1 is mounted on the disk table 2.
4, the ring flange 11 of the disc center ring 9 is brought into contact with the opening peripheral edge of the disc center hole 14a, and the disc clamper 13 and the disc table 2 are attached.
It is carried out by holding pressure.

At this time, even if the optical disc 14 is pressed against the ring flange 11 of the disc center ring 9 in a state where the optical disc 14 is inclined with respect to the disc mounting surface of the disc table 2, the disc is repulsed by the compression coil spring 12 so that the disc is repulsed. A force for returning to the initial posture acts on the center ring 9, and the optical disc 14 is brought close to the center position of the disc table 2.

[0018]

However, in the conventional disk chucking device, the axial dimension L ₁ of the cylindrical body 10 of the disk center ring 9 is set smaller than the inner diameter D ₁ . When the disc center ring 9 is inclined with respect to the disc mounting surface of the disc table 2 at the time of disc chucking as shown in FIG. 7, the slope of the disc mounting portion of the disc center ring 9 (the inclined portion 11b of the ring flange 11). Was getting bigger. As a result, there is a problem that the disk center ring 9 does not function and a chucking error occurs.

Therefore, in order to function as a disc center ring, it is conceivable to set the axial dimension L ₁ of the disc center ring 9 to a large value in order to set the L ₁ / D ₁ value to a large value. In this case, the size of the disk table 2 in the height direction also becomes large, which causes a problem that the device becomes large in the height direction.

The present invention has been made in view of the above circumstances, and provides a disk chucking device capable of preventing occurrence of a chucking error and preventing an increase in size in the device height direction. To do.

[0021]

DISCLOSURE OF THE INVENTION A disk chucking device according to the present invention is provided with a plurality of extending portions arranged in parallel at predetermined intervals in the circumferential direction on the inner peripheral edge of the back side of a disc centering, and these extending portions face each other. The disk table is provided with through holes.

[0022]

In the present invention, when the disc is pressed against the disc centering ring when the disc is chucked,
The disk center ring moves in the disk pressing direction along the outer peripheral surface of the guide rib and the inner peripheral surface of the through hole while allowing the extending portion to escape to the back side of the disk table.

[0023]

Embodiments of the present invention will be described in detail below with reference to embodiments shown in the drawings.

1 and 2 are a sectional view and an exploded perspective view showing a disk chucking device according to the present invention, FIG. 3 (A).
4A and 4B are a plan view and a sectional view showing a disc centering of the disc chucking device of the present invention, and FIGS. 4A and 4B are plan views showing a disc table of the disc chucking device of the present invention. FIG. 5 is a sectional view showing a chucking yoke of a disk chucking device according to the present invention. In FIG. 5, the disk clamper and the optical disk are designated by the same reference numerals, and detailed description thereof will be omitted.

In the figure, reference numeral 21 is a spindle motor having a motor shaft 21a protruding upward, and is fixed to a mechanical deck (not shown) for a CD player.

Reference numeral 22 denotes a disk table having a table center hole 22a opened on both front and back surfaces of the table, which is fixed to the tip end portion of the motor shaft 21a and can be rotated at a high speed by the spindle motor 21.

The disk table 22 is integrally provided with a cylindrical boss 23 projecting to the peripheral edge of the front side opening of the table center hole 22a and a cylindrical guide rib 24 extending around the boss 23. .

Then, in the disk table 22,
An arc inner surface 2 that is connected to the outer peripheral surface 24a of the guide rib 24
Four through holes 25 having 5a are provided at predetermined intervals in the circumferential direction.

Further, the disk table 22 is provided with two through holes 22b arranged in parallel in the inner circumferential direction of the guide ribs 24 with a predetermined gap.

Numeral 26 is a metal chucking yoke, which is a yoke center hole 27a through which the boss 23 is inserted and two screw holes 2 which are opened at the peripheral edge of the yoke center hole 27a.
The disk table 2 includes a bottomed cylindrical body 27 having a bottom 7b and a yoke flange 28 integrally provided at the opening end of the bottomed cylindrical yoke 27 and extending in the circumferential direction.
It is fixed on the surface of 2.

29 is an annular chucking magnet,
It faces between the boss 23 and the guide rib 24 and is adhered to the bottom surface of the bottomed cylindrical cylinder body 27. The chucking magnet 29 is formed by magnet rings whose upper and lower ends are magnetized into N and S poles.

Reference numeral 30 denotes a plastic disk center ring, which is a cylindrical body 31 having an inner peripheral surface 31a facing the outer peripheral surface of the guide rib 24, and an outer peripheral surface 31 of this cylindrical body 31.
a ring flange 32 having a horizontal portion 32a provided integrally with the yoke b facing the yoke flange 28 and an inclined portion 32b each having two slopes different in size from each other. There is.

An arcuate curved surface 33 facing the arcuate inner surface 25a is formed on the inner peripheral edge of the back side of the disk center ring 30.
Four extending portions 33, which have a, are arranged in parallel in the circumferential direction at a predetermined interval and face the inside of each of the through holes 25, are integrally provided.

34 is a conical compression coil spring,
It is provided around the cylindrical body 31 and is elastically mounted between the horizontal portion 32 a of the ring flange 32 and the surface of the disc table 22.

Reference numeral 35 is a friction sheet attached to the outer peripheral edge of the disk table 22 on the front side and made of a synthetic resin such as PET (polyethylene terephthalate).

In the disk chucking device thus constructed, the optical disk 14 can be mounted on the disk table 22 in the same manner as in the conventional disk chucking device.

That is, in the optical disc 14, the peripheral edge of the disc center hole 14a is the disc center ring 30.
Abutting against the ring flange 32 of the disk clamper 13
The disc table 22 holds the pressure.

At this time, the axial dimension L _{2 of the} bottomed cylinder 27 of the yoke of the disk center ring 30 is determined by the ring inner diameter D _2.
Since the optical disc 14 is pressed against the slanted portion 32b of the ring flange 32, the extended portion 33 is released to the back side (spindle motor side) of the disc table 22 and the disc center is released. The ring 30 moves in the disc pressing direction along the outer peripheral surface 24a of the guide rib 24 and the inner surface 25a of the through hole 25.

Therefore, in this embodiment, even if the disc center ring 30 is inclined with respect to the disc mounting surface of the disc table 22, the inclination of the disc mounting portion (the inclined portion 32b) of the disc center ring 30 is large. Therefore, the function of the disk center ring 30 can be fully exerted.

Further, in this embodiment, the extension 33 of the disc centering ring 30 can be released to the back side of the disc table 22, so that the dimension in the height direction of the disc table 22 can be set to the present dimension.

Incidentally, the assembly of the disk chucking device in this embodiment is carried out as follows.

That is, first, the compression coil spring 34 is positioned around the outer periphery of the guide rib 24, and then each extending portion 33 penetrates between the inner peripheral portion of the compression coil spring 34 and the outer peripheral surface of the guide rib 24. The disc centering ring 30 is positioned so as to face the hole 25, and then the chucking yoke 2 is placed on the disc table 22 so that the yoke bottomed cylinder 27 faces between the boss 23 and the guide rib 24.
After 6 is adhered, the chucking magnet 29 is fixed in the chucking yoke 26.

In the present embodiment, an example in which the present invention is applied to a CD player has been shown, but the present invention is not limited to this, and the same applies to an optical disc device such as a CD-ROM player. Is applicable to.

Of course, the shape and external dimensions of the disk center ring in the present invention are not particularly limited.

[0045]

As described above, according to the present invention, a plurality of extending portions arranged in parallel at a predetermined interval in the circumferential direction are provided on the inner peripheral edge of the back side of the disc centering, and the through holes facing these extending portions are formed. Since it is provided on the disc table, when the disc comes into pressure contact with the disc center ring during chucking of the disc, the disc center ring moves to the outer peripheral surface of the guide rib and the inner peripheral surface of the through hole while allowing the extended portion to escape to the back side of the disc table. It will move along the disc pressing direction.

Therefore, even if the disc center ring is inclined with respect to the disc mounting surface of the disc table,
Since the inclination of the disc mounting portion of the disc centering ring does not become large, the function of the disc centering ring can be fully exerted and the occurrence of chucking mistake can be prevented.

The fact that the extended portion of the disk center ring can be released to the back side of the disk table allows the size of the disk table in the height direction to be set to the current size, thus increasing the size in the device height direction. Can be stopped.

[Brief description of drawings]

FIG. 1 is a sectional view showing a disk chucking device according to the present invention.

FIG. 2 is an exploded perspective view showing a disc chucking device according to the present invention.

3 (A) and 3 (B) are a sectional view and a bottom view showing a disc centering ring of the disc chucking device according to the present invention.

4A and 4B are a plan view and a sectional view showing a disc table of a disc chucking device according to the present invention.

FIG. 5 is a sectional view showing a chucking yoke of the chucking device according to the present invention.

FIG. 6 is a sectional view showing a conventional disk chucking device.

FIG. 7 is a sectional view showing an example of defective placement of a disc on a disc centering of a conventional disc chucking device.

[Explanation of symbols]

 21 ... Spindle motor 22 ... Disk table 24 ... Guide rib 24a ... Outer peripheral surface 25 ... Through hole 25a ... Inner surface 30 ... Disk center ring 31 ... Cylindrical body 31a ... Inner peripheral surface 33 ... Extension part

Claims (1)

[Claims] 1. A disk table having a cylindrical guide rib in its center and rotated by a spindle motor, and a disk having an inner peripheral surface held by the disk table so as to be movable back and forth and facing the outer peripheral surface of the guide rib. A center ring is provided, and a plurality of extending portions arranged in parallel at a predetermined interval in the circumferential direction are provided on the inner peripheral edge of the back side of the disc center ring, and through holes through which the extending portions face are provided in the disc table. And a disk chucking device.