JPH01182960A - Optical disk device - Google Patents

Abstract

PURPOSE:To reduce the driving source of a clamping board elevating and the impact on detaching by making the one spot of an edge part, that is, the part to which a convex part is provided of a magnet detach on a magnet clamper detaching and the whole holding be canceled gradually. 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 modified by a centering ring. The title device has a constitution in which a holding cancellation starts by the pressing of a convex part 9 provided on the one part or the plural parts of a magnet clamper 5 or the one part or the plural parts of a clamping board. On the detaching of the magnet clamper 5, a magnet 7 does not detach from the turn table over the whole at the same time, the one spot of an edge part detaches first, and the holding of the whole is canceled gradually. Thus, the small driving source of the elevating of the clamping board 6 and the small rigidity of the clamping 6 satisfy, and impact on the detaching can be reduced.

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 optical disc devices such as optical disc playback devices and optical disc recording/playback devices.

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

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

Fig. 3 is a perspective view of a conventional magnetic clamper that uses magnetic force to clamp a disc between it and a turntable, Fig. 4 is a perspective view of the turntable on which the disc is placed, and Fig. 6 is a perspective view of the turntable. FIG. 6 is a plan view of the table;
The figure is a sectional view showing a state in which the magnetic clamper t is released from the turntable by a clamp plate for attaching and detaching the magnetic clamper t to 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 for minimizing eccentricity of the disk, and 5 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 described above will be explained below.

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 magnetic clamper 5 is lowered, the magnet 7 is attracted to the turntable 3, the disk 1 is clamped between the magnetic clamper 6 and the turntable 3, and the magnetic clamper 5 and the clamp plate 6 are in contact with each other. In this state, the motor rotates and recording or playback is started.

Conversely, when taking out the disc, when the motor stops, the clamp plate is raised, the disc clamping is released, and the disc 1 is taken out from the turntable 3 by the disc transport means.

Problems to be Solved by the Invention However, with the above configuration, a large force is required when releasing the disc clamping, that is, at the moment when the magnet separates from the turntable, so it is necessary to increase the power of the drive source and improve the rigidity of the clamp plate. The point that you have to do is
In addition, there was a problem in that the impact at the moment of detachment degraded the quality of the device.

Means for Solving the Problems In order to solve the above problems, the optical disk device of the present invention optically records information on a disk-shaped information recording medium or optically reproduces information recorded on a disk-shaped information recording medium. a turntable for placing the recording medium during recording and reproduction; a magnetic clamper for clamping the recording medium between the turntable and the turntable using magnetic force; a clamp plate for attaching and detaching the magnetic clamper to and from the turntable; and a rotational drive means for rotationally driving the turntable; The clamping release is started by pressing a convex portion provided at one or more locations of the clamp plate.

Effects of the present invention With the above-described configuration, when the magnet clamper is detached, the entire magnet does not detach from the turntable at the same time, but one part of the end first detaches, and gradually the entire clamping is released. The drive source for lifting and lowering the plate and the rigidity of the clamp plate can be small, and the impact upon detachment can also be reduced.

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, the overall configuration is almost the same as the conventional example explained using FIG. 6, but the one difference 9 is a convex portion provided on a part of the magnetic clamper.

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 magnetic clamper 6 is lowered, and the magnet 7 is attracted to the turntable 3, but the magnetic clamper 5 is lowered in an inclined state due to the protrusion 9 provided on a part of the magnetic clamper. Therefore, the magnet 5 attracts the turntable little by little from its end and clamps the disc 1, so that the impact is small. After being attracted in this way, the clamp plate 6 and the magnetic clamper -6 are brought into a non-contact state, and the motor rotates to start recording or reproducing.

Conversely, when taking out the disc, when the motor stops, the clamp plate rises, the disc clamping is released, and the disc 1 is taken out from the turntable 3 by the disc transport means. As a result, the magnet clamper 5 is raised in a tilted state, and the magnet 6 is gradually separated from the turntable from its end, which reduces the impact. Rigidity can also be reduced.

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 the second embodiment, the protrusion 1o is provided on the clamp plate 6, but the same operation and effect as in the first embodiment can be obtained.

Effects of the Invention As described above, in the present invention, when the magnet clamper is detached, the entire magnet does not detach from the turntable at the same time, but one part of the end, that is, the part where the convex portion is provided, detaches first, and then the entire magnet is clamped. As a result, the drive source for raising and lowering the clamp plate can be small, and the rigidity of the clamp plate can also be small, so that the impact upon detachment can be reduced.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a clamping mechanism of an optical disk device according to an embodiment of the present invention, FIG. 2 is a sectional view of a clamping mechanism of an optical disk device of a different embodiment of the present invention, and FIG. 3 is a sectional view of a conventional magnetic clamper. 4 is a perspective view of a general turntable, FIG. 5 is a plan view of the same turntable, and FIG. 6 is a sectional view of a conventional optical disc device clamping mechanism. 1...disc, 2...motor, 3.
... Turntable, 4 ... Centering ring, 6 ... Magnetic clamper, 6 ...
...Clamp plate, 7...Magnet, 8...
...Yoke, 9...Clamper convex part, 10.
...Clamp plate protrusion. Name of agent: Patent attorney Toshio Nakao and 1 other person9-
Cla) 2-1 Convex part Fig. 1 10- Clamper convex part Fig. 2 Fig. 3 m Fig. 4 Fig. 5/-11 Disk? -Motor 3-Turn tip 4-Wing 6-Magnetic clamp 6-Clamp section 7-7 gear b δ-Yoke Fig. 6

Claims (1)

[Claims] An optical head for optically recording information on a disc-shaped information recording medium or optically reproducing information recorded on the disc-shaped information recording medium, and a turntable for placing the recording medium during recording and reproduction. a magnetic clamper that clamps the recording medium with the turntable using magnetic force; a clamp plate for attaching and detaching the magnetic clamper to and from the turntable via the recording medium; In the optical disc device, a convex portion is provided at one or more places of the magnetic clamper or at one or more places of the clamp plate, when the magnetic clamper is detached. An optical disc device characterized by having a configuration in which unclamping is started by pressing the convex portion.