JPH01182959A - Optical disk device - Google Patents

Abstract

PURPOSE:To stably clamp even a disk which has the same hole diameter and a little different thickness by attracting the one part of a turn table by a magnet provided on a clamper, pressing and clamping a recording medium with an elastic member provided on the clamper. CONSTITUTION:A disk 1 is mounted on a turn table 3 fixed to a motor 2 by a disk shifting means, and at the same time, the central dislocation of the disk is corrected by a centering ring. Then, the one part of the turn table is attracted by a magnet 7 provided on a clamper 9, and the title device is constituted to press and to clamp a recording medium by using an elastic member 12 provided on the clamper 9. Thus, even when the disk to have a little different thickness is mounted, the magnet 7 is set to a condition in which a clearance is not left between the turn table 3 and the magnet 7, and the other hand, a face to face to the disk 1 of the clamper 9 can press a disk face elastically and can clamp it stably.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to an optical disc recording device for optically recording information on a disc-shaped information recording medium (hereinafter referred to as a disc) or reproducing information recorded on the disc.

The present invention relates to an optical disc playback device and an optical disc recording/playback device.

2. Description of the Related Art In recent years, many magnetic clampers have been used in optical disc devices as means for mounting and fixing a disc on a turntable.

An example of the above-mentioned conventional disk mounting means will be described below with reference to the drawings.

Figure 3 is a perspective view of a conventional magnetic clamper that uses magnetic force to hold a disc between it and a turntable, Figure 4 is a perspective view of a turntable on which a disc is placed, and Figure 6 is a perspective view of the A plan view of the turntable, No. 6
The figure is a sectional view showing a state in which the turntable is released from being clamped by the magnetic clamper by a clamp plate for attaching and detaching the magnetic clamper to and from the turntable via a disk.

In Fig. 6, 1 is a disk, 2 is a motor for rotating the turntable, 3 is a turntable on which the disk is placed, 4 is a centering ring to minimize the eccentricity of the disk, and 6 is a magnetic clamper. In the main body, 6 is a clamp plate, 7 is a magnet, and 8 is a yoke.

The operation of the clamping mechanism of the optical disc device configured as above will be described below.

A disk 1 is placed on a turntable 3 fixed to a motor 2 by a disk transfer means (not shown),
At the same time, the centering ring 4 corrects the center deviation of the disk. Then, the clamp plate 6 carrying the magnetic clamper 6 is lowered, the magnet 7 is attracted to the turntable 3, the disk 1 is held between the magnetic clamper 6 and the turntable 3, and the magnetic clamper 6 and the clamp plate 6 are in a non-contact state. In this state, the motor rotates and recording or reproduction is performed.

Conversely, when the disc is to be removed, when the motor stops, the clamp plate is raised, the disc clamping is released, and the disc 1 is removed from the turntable 3 by the disc transfer means.

Problems to be Solved by the Invention However, with the above configuration, in the clamped state, the surface of the magnetic clamper that faces the disk always presses the disk, and the surface of the magnet that faces the turntable presses the turntable. Although it is desirable to maintain suction by leaving a small gap between the magnet and the turntable, if the thickness of the disc changes, for example, if it is too thick, the gap between the magnet and the turntable is too large and - strong suction force cannot be obtained. If it is too thin, there will be no gap between the magnet and the turntable, and even if the magnet and turntable are completely attracted, there will be a gap between the disk and the surface of the magnetic clamper that faces the disk, making it impossible to clamp it properly. had the following issues.

Means for Solving the Problems The present invention provides an optical head for optically recording information on a disk-shaped recording medium or for optically reproducing information recorded on the recording medium, and an optical head for optically reproducing information recorded on the recording medium, and an optical head for optically reproducing information recorded on the recording medium. a turntable for placing the recording medium on the turntable, a clamper for holding the recording medium between the turntable, a clamp plate for holding the clamper or for attaching and detaching the clamper to the turntable, and the turntable. In the optical disc device, a part of the turntable is attracted by a magnet provided in the clamper, and the recording medium is pressed by using an elastic member provided in the clamper. It is configured to be clamped.

Operation The present invention has the above-described structure, so that even when disks of slightly different thickness are placed, the magnet attracts them with almost no gap left between them and the turntable, while the surface of the clamper facing the disk is elastic. The disk surface can be pressed down to ensure stable clamping.

EXAMPLE Hereinafter, a clamping mechanism of an optical disc device according to an example of the present invention will be described with reference to the drawings.

FIG. 1 shows a sectional view of a clamping mechanism of an optical disc device according to a first embodiment of the present invention.

In FIG. 1, numerals 1 to 8 are similar to the conventional example shown in FIG. 9 is a clamper main body, 1o is a pressing plate that presses the disk surface, and 11 is a spring that presses the disk surface via the pressing plate.

The operation of the clamping mechanism of the optical disc device configured as described above will be explained with reference to FIG.

A disk transfer means (not shown) places the disk 1 on a turntable 3 fixed to a motor 2, and at the same time a centering ring 4 corrects the center deviation of the disk. Then, the clamp plate 6 carrying the clamper body 9 descends, and the magnet 7 attracts the turntable 3. At the same time, the spring 11 presses the disk 1 via the suppression plate 10, and the disc 1 is stably held between the turntable 3 and the clamp plate 6. The clamp plate 6 and the clamper main body 9 are held in a non-contact state, and the motor rotates to start recording or reproducing.

Next, a second embodiment of the present invention will be described with reference to the drawings. FIG. 2 is a sectional view of a clamping mechanism of an optical disc device showing a second embodiment of the present invention.

In FIG. 2, 1 to 8 are the same as those described in the conventional example using FIG. 6, 9 is the clamper body according to the present invention, and 12 is an elastic member for directly pressing and clamping the disk. be. In the first embodiment, the disk is pressed by a spring via a suppression plate, but in the second embodiment, the disk 1 is pressed by an elastic member 12 and clamped by being held between it and the turntable 3. There are such differences.

Effects of the Invention As described above, the present invention provides an optical head for optically recording information on a disk sleeve information recording medium or for optically reproducing information recorded on the recording medium, and an optical head for optically reproducing information recorded on the recording medium, and for recording information on the recording medium during recording and reproduction. a turntable for placing the recording medium; a clamper for holding the recording medium between the turntable;
In an optical disc device comprising a clamp plate for holding the clamper or for attaching and detaching the clamper to and from the turntable, and rotational driving means for the turntable, a part of the turntable is rotated by a magnet provided on the clamper. By suctioning the recording medium and using an elastic member provided in the clamper to press and clamp the recording medium,
Discs with the same hole diameter but slightly different thickness, e.g. 1~2m
It is possible to stably clamp even objects that are different in size.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view of a clamping mechanism of an optical disk device according to a first embodiment of the present invention, FIG. 2 is a cross-sectional view of a clamping mechanism of an optical disk device according to a second embodiment of the present invention, and FIG. 3 is a conventional example. FIG. 4 is a perspective view of a general turntable, FIG. 5 is a plan view of the same general turntable, and FIG. 6 is a sectional view of a conventional clamp mechanism. 1...disc, 2...motor, 3.
... Turntable, 4 ... Centering ring, 6 ... Magnetic clamper, 6 ...
...Clamp plate, 7...Magnet, 8...
...Yoke%9...Clamper body, 1゜・
...Press plate, 11...Spring, 12
...Elastic member. Name of agent: Patent attorney Toshio Nakao and 1 other person No. 1
figure? Figure 2 Figure 3 Figure 5 / -・-Disk 7- Mag order/ent 8-Yoke

Claims (1)

[Claims] an optical head for optically recording information on a disk-shaped information recording medium or optically reproducing information recorded on the recording medium; and a turntable for placing the recording medium during recording and reproduction; A clamper for holding the recording medium between the turntable, a means for holding the clamper or for attaching and detaching the clamper to the turntable, and a rotational drive means for the turntable, An optical disc device characterized in that a magnet provided attracts a part of the turntable, and an elastic member provided in the clamper presses and clamps the recording medium against the turntable.