JPH0538430Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] This invention relates to a disk clamping mechanism suitable for optical disk players, and in particular, a sleeve locked to the turntable presses a clamper via a coil spring to clamp the disk. The present invention relates to a disk clamp mechanism that eliminates the negative effects of friction.

[Prior Art] A conventional example of a clamping device for an optical disc player is shown in FIG.

In the figure, reference numeral 2 denotes an optical disk, which is placed on the turntable 1 while being guided by a center guide 4. The center guide 4 is urged upward by a spring 5, and guides the optical disk 2 to the center position of the turntable with its upper tapered surface.

The clamper 3 is supported by a clamper holder 6 and is retracted upward when the optical disc 2 is set, but when the optical disc 2 is set, it is pushed downward by the clamper holder 6 and presses the disc 2 against the turntable 1.

When the clamper moves downward, it is guided by the upper projection of the center guide 4 and aligned with the center position of the turntable 1.

[Problems to be solved by the invention] In the conventional device described above, when the clamper presses the disk, the clamper and the clamper holder are in contact with each other, so the clamper rotating together with the turntable and the stationary clamper holder are in contact with each other. Frictional force is generated between the two, which is affected by the rotation of the turntable, and the clamping force cannot be increased very much.

This invention was made in view of the above points, and its purpose is to provide a disk clamping mechanism in which the non-rotating portion does not come into contact with the clamper when the disk rotates.

[Means for Solving the Problems] The disc clamp mechanism of this invention clamps a disc placed on a turntable by pressing it against the turntable using a clamper. A sleeve is fitted into the round hole, a clamp lock shaft is fitted inside the sleeve, a stepped groove with a deeper upper side is provided on the lower outer periphery of the clamp lock shaft, and a plurality of balls are inserted into the groove. The clamp lock shaft is placed so that it can be inserted into the groove on the side of the round hole of the turntable through a through hole in the side wall of the sleeve, and the clamp lock shaft is biased upward by a spring. A coil spring is interposed between the clamper and the clamper, and by pushing down the sleeve, the ball enters the groove on the side of the round hole of the turntable, locking the sleeve to the turntable, and applying a pressing force to the clamper by the elasticity of the coil spring. .

[Operation] According to this invention, when the sleeve is pushed down, the ball hanging in the through hole of the sleeve is pushed down by the sleeve and moved to the shallow part of the groove of the clamp lock shaft. At this time, the ball is pushed out so as to protrude from the through hole of the sleeve, enters the groove on the side of the round hole of the turntable, and locks the sleeve. Therefore,
Even when the member that pushed down the sleeve is released from the sleeve, the sleeve does not rise, and since a clamping force is applied via the coil spring, no frictional force is generated due to rotation of the clamper.

To deactivate the clamper, press down on the clamp lock shaft, and the ball will move to the deep groove of the clamp lock shaft and come out of the groove on the side of the round hole of the turntable, releasing the lock on the sleeve.

[Example] An example of the disk clamp mechanism of this invention will be described based on FIG.

In the figure, parts having the same functions as those shown in the conventional example are given the same reference numerals.

In the figure, reference numeral 2 denotes an optical disk, which is placed on the turntable 1 while being guided by a center guide 4. The center guide 4 is biased upward within the round hole of the turntable 1 by a spring 5.
The upper tapered surface guides the optical disk 2 to the center position of the turntable.

A sleeve 8 is slidably fitted into a round hole of the turntable 1.

Also, inside the sleeve 8, an upper part 9a and a lower part 9b are provided.
A clamp lock shaft 9 formed by integrally tightening the two is slidably fitted.

The outer circumferential surface of the lower portion 9b of the clamp lock shaft forms a stepped groove 9c with a deeper upper side, and a plurality of balls 10, 10, . . . are arranged in this groove. The stepped groove 9c has a tapered surface 9d.

A stepped round hole is formed in the center of the lower part 9b of the clamp lock shaft, into which a stopper 11 is fitted, and a spring 12 is interposed in the upper part of the stopper 11.

A plurality of through holes 8a, 8a... whose width is slightly smaller than the diameter of the balls are bored in the side wall of the sleeve, and the balls 10, 10... that protrude from the through holes 8a, 8a... are attached to the turntable 1. It can be inserted into the groove 1a on the side surface of the round hole.

A coil spring 13 is inserted between the donut-shaped clamper 3 placed on the top of the turntable and the flange 8b provided on the sleeve.
and is interposed in a fixed state to the clamper 3.

Next, the effect will be explained.

In the initial state, the ball 1 is placed in the groove 9c of the clamp lock shaft 9 by a clamper operating mechanism (not shown).
0 and 10, so when the sleeve 8 is pushed down, the balls 10, 10, etc. hanging in the through holes 8a, 8a... of the sleeve 8 are pushed down by the sleeve 8, and the balls 10, 10, etc. are pushed down by the sleeve 8, and the balls 10, 10,... Move along to the shallow part.

At that time, the balls 10, 10 are inserted into the through hole 8 of the sleeve.
The sleeve 8 is pushed out so as to protrude from d, 8d... and enters the groove 1a on the side surface of the round hole of the turntable 1.
lock. Therefore, even if the clamper actuating mechanism that has pushed down the sleeve 8 is released from the sleeve, the sleeve will not rise, and since a clamping force is applied via the coil spring 13, no frictional force is generated as the clamper rotates.

When releasing the operation of the clamper 3, the clamp lock shaft 9 is moved by the spring 12 by the clamper operation mechanism.
When the balls 10, 10 are pushed down against the elasticity of the clamp lock shaft 9, they move to the deep part of the groove of the clamp lock shaft 9 and come out of the groove 1a on the side surface of the round hole of the turntable 1, so that the lock of the sleeve is released. Further, by pulling out the sleeve 8 and the clamp lock shaft 9 from the round hole of the turntable 1 by the clamper operating mechanism, the disk 2 can be replaced.

Although the embodiment is constructed as described above, the invention is not limited to this. For example, the spring that biases the clamp lock shaft may be placed below the clamp lock shaft, and the clamp lock shaft may be made of one component. can. In this case, a stopper is not required. In addition, if the dimensions of the grooves on the clamp lock shaft and turntable are set to appropriate values, the ball can be pushed into the groove 1 on the side of the round hole in the turntable without having to make the step of the groove on the clamp lock shaft a tapered surface. becomes possible.

[Effects of the invention] According to the disk clamp mechanism of this invention, the clamp lock shaft that presses the clamper is locked to the turntable, so it applies a pressing force to the clamper without contact, so no frictional force is generated and the turntable is fixed. It does not affect the rotation, so it is possible to increase the clamping force. Further, since the pressing force of the clamper is applied by the elasticity of the coil spring, it is easy to match the standard value.

Since the clamper operating mechanism separates from the turntable when the turntable rotates, the mounting accuracy of the clamper operating mechanism can be made rough.

Furthermore, the clamping and unclamping operations of the disk can be performed very simply by simply pushing the sleeve and the clamp lock shaft.

[Brief explanation of the drawing]

Figure 1 is a sectional view showing an embodiment of this invention, Figure 2 is a sectional view showing an embodiment of this invention.
The figure is a sectional view showing an example of the prior art. 1... Turntable, 2... Disc, 3...
... Clamper, 4 ... Center guide, 5 ... Spring, 6 ... Clamper holder, 8 ... Sleeve, 9
... Clamp lock shaft, 9c ... Groove, 10 ... Ball, 11 ... Stopper, 12 ... Spring, 13
...Coil spring.

Claims (1)

[Scope of utility model registration request] In a disk clamp mechanism in which a disk placed on a turntable is pressed against the turntable by a clamper and clamped, a round hole with a bottom is provided in the turntable, a sleeve is fitted into the round hole, and a sleeve is inserted into the inner side of the sleeve. A clamp lock shaft is fitted, a stepped groove with a deeper upper side is provided on the lower outer periphery of the clamp lock shaft, and a plurality of balls are inserted into the groove from the through hole provided in the sleeve side wall into the groove on the side of the round hole of the turntable. The clamp lock shaft is biased upward by a spring, and a coil spring is interposed between the clamper located at the top of the turntable and the flange provided on the sleeve, and the sleeve is pushed down, so that the ball is A disk clamping mechanism characterized in that the sleeve is inserted into a groove on the side surface of a round hole of the turntable, the sleeve is locked on the turntable, and a pressing force is applied to the clamper by the elasticity of the coil spring.