JPS6323804Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a disk drive mechanism, and more particularly to a disk drive mechanism for a disk player having a disk clamp means for clamping a disk together with a turntable.

Conventionally, in the disk drive mechanism of a disk player, which has a disk clamping means that clamps the disk together with the turntable by using the suction force of a magnet, the disk is clamped, especially when starting up or during trick play where the rotational speed of the disk is rapidly changed. The disc may slip against the turntable, which had an undesirable effect on disc playback.

An object of the present invention is to provide a disk drive mechanism that does not cause the above-mentioned slip, that is, can reliably rotate the disk in accordance with the rotation of the turntable.

The disk drive mechanism according to the present invention includes a turntable to which a rotational force is applied, a disk clamping means for clamping the disk together with the turntable, and a flexible friction member fixed to the turntable and in contact with the disk. It is characterized by becoming.

Hereinafter, embodiments of the disk drive mechanism according to the present invention will be described with reference to FIG. 1, FIGS. 2a and 2b, and FIG. 3.

In the figure, reference numeral 1 denotes a turntable, and this turntable 1 includes a substantially plate-shaped disk supporting member 4 fitted to an output shaft 3 of a drive motor 2, and a ring fitted to the tip of the output shaft 3. a supporting member 6 made of a magnetic material to which a shaped magnet 5 is fixed and forming a magnetic circuit; and a sliding member provided between the disk supporting member 4 and the supporting member 6 and slidably fitted to the output shaft 3. 7, a coil spring 8 that applies a predetermined upward bias force to the sliding member 7 in FIG. and a plurality of rubbers 11, which are arranged substantially concentrically on the upper surface of the outer circumferential portion of the cup spring 10 and are fixed thereto, thereby forming a flexible friction member together with the cup spring 10. In addition, the support member 6
A recess 6a is provided at the rotation center of the disk 12, and a center hole 12a of the disk 12 is provided on the outer periphery of the sliding member 7.
A tapered portion 7a is provided which fits into the center of the disk 12 to center the disk 12. 13 is a clamper that clamps the disc 12 together with the turntable 1, and this clamper 13 includes a ring-shaped magnetic member 1.
4 is fitted, and a protrusion 13a that can be fitted into the recess 6a of the support member 6 is provided at its rotation center. This protrusion 13a is preferably made of a non-magnetic material, and may be constructed from a separate member.

Next, the operation of the disk drive mechanism described above will be explained.

First, as shown in FIG. 1, the tapered portion 7a of the sliding member 7 is fitted into the center hole 12a of the disk 12, and the disk 12 is placed on the turntable 1. Thereafter, the clamper 13 is placed on the disk 12 while the protrusion 13a is fitted into the recess 6a of the support member 6. Then, as shown in FIG. 3, the magnetic member 14 is attracted by the magnet 5, so that the disk 12, together with the clamper 13 and the sliding member 7, resists the bias force of the coil spring 8, and the disk 12 moves against the disk supporting member 4. Move until it touches the. In the process of this movement, the disk 12 contacts the rubber 11 and bends the cup spring 10, so that when the disk 12 is in contact with the disk support member 4, the rubber 11 is pressed against the disk 12 by the cup spring 10. becomes.

In this state, the turntable 1 is driven to rotate, but since there is a sufficient frictional force between the rubber 11 and the disc 12, the disc 12 is reliably driven in accordance with the rotation of the turntable 1. be.

By removing the clamper 13, the disk 12 and the sliding member 7 are returned to their original state by the bias force of the coil spring 8, and the rubber 11 is also returned to its original state by the restoring force of the cup spring 10.

In the disk drive mechanism of this embodiment, a plate spring 10 is provided on the turntable 1, and a rubber 11 with a large friction coefficient fixed to the free end of the plate spring is brought into contact with the disk 12. There is. By interposing the leaf spring between the turntable and the rubber in this way, the rubber is always brought into contact with the disc with a uniform force, and a constant frictional force is created between the rubber and the disc. This results in a stable disk rotation state.

As mentioned above, the disk drive mechanism of the present invention includes a flexible friction member that is fixed to the turntable and comes into contact with the disk, so it is possible to control the rotation speed of the disk during startup or trick play. Even when making sudden changes, the disc can be reliably driven without slipping against the turntable.

[Brief explanation of the drawing]

Fig. 1 is a sectional view showing the embodiment of the present invention before clamping, Fig. 2 a and b are plan views and sectional views showing the flexible friction member in Fig. 1, and Fig. 3 shows the clamped state. FIG. Explanation of symbols of main parts, 1... Turntable, 2... Drive motor, 5... Magnet, 10
... Cup spring, 11 ... Rubber, 12 ... Disk, 13 ... Clamper, 14 ... Magnetic member.

Claims (1)

[Scope of utility model registration request] The flexible friction member includes a turntable to which a rotational force is applied, a disk clamping means for clamping a disk together with the turntable, and a flexible friction member fixed to the turntable and in contact with the disk. The member is comprised of a flexible leaf spring and at least two pieces of rubber having a large friction coefficient, which are arranged and fixed substantially concentrically about the rotation axis of the turntable on the leaf spring. Characteristic disk drive mechanism.