JP3123044B2 - Disc clamp device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a disk clamp device for a disk player.

[0002]

2. Description of the Related Art As shown in FIG. 9, an O-ring 11 of an elastic body is extrapolated to a cylindrical shaft 10a protruding from the center of the upper surface of a turntable 10, and a plurality of (for example, 3 Guide members 12 in which the ball holes 12a
The lower end 12b was press-fitted into the turntable 10 in a state where it was covered. A plurality of (for example, three) steel balls 13, 13, 13 are equally arranged in the ball hole 12a, and the steel balls 13, 13, 13 are elastically urged outward by the O-ring 11. Was.

[0003]

However, the conventional disk clamp apparatus has a problem that the elasticity of the O-ring 11 of the elastic body deteriorates with time and the elasticity of the O-ring 11 decreases, so that the elasticity of the steel ball 13 gradually decreases. was there.

Further, the conventional disk clamp device requires a separate step of press-fitting the guide member 12 into the turntable 10.

Accordingly, the present invention has been made in view of the above-mentioned circumstances, and a method in which a resilient force to a ball is generated by a coil spring via a holding plate and a guide member is integrally formed with a turntable. Accordingly, the present invention provides a disk clamp device that eliminates the conventional disadvantages.

[0006]

SUMMARY OF THE INVENTION The present invention provides a turntable, a guide member protruding from an upper surface of the turntable, a plurality of spring receivers protruding from a lower surface of the turntable, and the guide member. A plurality of ball holes, a holding plate having an inclined surface loosely fitted to a boss provided upright on the guide member, a plurality of balls provided in the plurality of ball holes, the holding plate, and A compression coil spring mounted between the spring receiver and a contact 37d between the ball disposed in the ball hole and the pressing plate, and a contact 33d between the ball and the guide member. In a disk clamp device having an angle of less than 180 ° outward with respect to 0, a substantially horizontal flat surface or an upwardly inclined surface is formed at the end of the inclined surface of the holding plate.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below in detail with reference to the accompanying drawings. FIG. 1 is a plan view and an overall side view of a disk clamp device showing an embodiment of the present invention, and FIG. 2 is an operation explanatory diagram when a disk is mounted.

In the figure, 31 is a table portion, 33 is a guide member, 32 is a boss, and the guide member 33 projects in the center of the upper surface of the turntable 30 and is formed in a cylindrical shape whose upper surface is closed by a lid 33a. . In the center of the lower surface of the turntable 30, a plurality (for example, 3
) Of spring receivers are protrudingly provided. The cylinder 33b is provided with a plurality of (for example, three) ball holes 33c.

The inner diameter of the boss 32, which is erected at the center of the lower surface of the lid 33a of the guide member 33, is loosely fitted.
A holding plate 37 having a downwardly inclined surface is provided. The three ball holes 33c are provided with steel balls 35, each of which has a lower part in contact with the inclined surface 37a of the holding plate 37 and a part projecting outward in a state in which the upper part is in contact with the ball holes 33c. It is arranged. The steel 35 may be hard plastic or other metal other than steel. Also,
A compression coil spring 36 is disposed between the lower surface of the holding plate 37 and the spring receiver 34. In addition, 40 is a chassis,
41 is a motor.

Then, as shown in FIG. 4, a contact 37d where the inclined surface 37a contacts the steel ball 35, and the guide member 33
The upper end of the ball hole 33c passing through the lower edge 33e of the lower surface of the cover 33a contacts the steel ball 35 and the contact 33d makes an angle of less than 180 ° outward with respect to the center O of the steel ball 35. The corner slopes obliquely downward toward the outside.

However, as shown in FIG. 6 (b), the point of symmetry 35a of the steel ball center O of the contact point 37d where the steel ball 35 contacts the inclined surface 37a is located outside the outer edge 33e of the lower surface of the lid 33a of the guide member 33. If the disc hole 22 is
a The inside is located between the point symmetry point 35a and the outer edge 33e of the lower surface of the lid. In this case, as shown in FIG. 7 (c), since the steel ball 35 tends to move in the direction of arrow c, that is, outward, the chucking of the disc 20 is impossible. In FIG. 6B, a range in which chucking is not possible, and f indicates a range in which chucking is possible.

Therefore, in this embodiment, the inclined surface shown in FIG.
As shown in FIG. 6 (a), 37a is formed by a chucking inclined surface 37b and a moving inclined surface 37c extending from the chucking inclined surface 37b, the inclination angle is adjusted by the moving inclined surface 37c, and a contact point with the inclined surface is formed. The point symmetry point 35a of the center O of the steel ball 37d coincides with the outer edge 33e of the lower surface of the lid of the guide member 33.

FIGS. 7A to 7C show the positions of point symmetry points 35a,
The moving direction of the steel ball 35 according to the contact position of the lower edge 20b inside the disc hole is described.

Also, as shown in FIG.
When pressing the steel ball 35 toward the outer periphery in 7a, the force applied to the pressing plate 37 and F, when the force to move the steel balls and F _4, gradient to move toward the outer circumference of the steel ball with maximum force Since the angle is 45 degrees, the angle of the chucking inclined surface 37b is preferably close to 45 degrees. In the figure, reference numeral 33a denotes a lid of the guide member 33.

Further, when the steel ball 35 is pressed in the outer peripheral direction by the inclined surface, the steel ball 35 is always urged by the inclined surface 37a when the disc 20 is not mounted.
The outer peripheral direction 33e of the guide member shown in FIG. 4 is only a small protrusion on the lower surface of the lid, so that a steel ball is applied when a large force is applied. 35 gets over the stopper. Therefore, in the present embodiment, the steel ball 35 in a state where the disk 20 is not mounted is at the outermost peripheral position,
As shown in FIG. 3, a substantially horizontal flat surface 37e having a predetermined width or an upwardly inclined surface 37f is provided at the end of the inclined surface 37a so that no pressing force is generated in the outer peripheral direction.

Further, as shown in FIG. 8 (b), the steel ball 35 is pressed by the compression coil spring 36 via the pressing plate 37. However, since the compression coil spring end portion 36a has a step, the steel ball 35 has a step. If the contact portion between the lower surface of the presser plate 37 (the upper surface in FIG. 8B) and the end portion 36a of the compression coil spring 36 is flat, the contact point between the presser plate 37 and the compression coil spring 36 is undefined, and the pressing force is May not evenly cover the steel ball 35 of the vehicle. Therefore, in the present embodiment, as shown in FIG.
(The upper surface in FIG. 8 (b)) is in contact with the compression coil spring 36.
(For example, three) projections 37g are provided.

[0017]

According to the present invention described in detail above, the following effects can be obtained. The conventional guide member is made separately and press-fitted into the turntable, but in the present invention, since it is integrally molded with the turntable, the number of parts is reduced, the press-fitting step by press can be eliminated, and work efficiency is improved. . In addition, since the pressing force by which the ball is elastically urged outward is not by the elastic body such as rubber but by the coil spring, the pressing force due to the aging change is small.

[Brief description of the drawings]

FIG. 1 is a view showing one embodiment of the present invention, wherein (a) is a plan view and (b) is an overall side view.

FIGS. 2A to 2C are explanatory diagrams of an operation when a disk is mounted on a disk clamp device.

FIG. 3A is an explanatory view of a flat view extended to a holding plate, and FIG.
FIG. 5 is an explanatory view of an upwardly inclined surface extending from a holding plate.

4A is an enlarged view of a portion A in FIG. 2, and FIG. 4B is a sectional view taken along line BB of FIG.

FIG. 5 is an explanatory diagram of an angle α of an inclined surface for moving a ball to an outer peripheral side with a maximum force.

6 (a) is an explanatory view in the case where the inclined surface of the holding plate is composed of a chucking inclined surface and a moving inclined surface, and FIG. 6 (b) is a diagram in the case where the inclined surface of the holding plate has no moving inclined surface. FIG.

FIGS. 7A to 7C are explanatory diagrams showing the relationship between the angle of the inclined surface of the pressing plate and the moving direction of the ball.

8A is a bottom view of the turntable when a plurality of protrusions are provided on the lower surface of the holding plate, and FIG. 8B is a longitudinal sectional view of FIG.

FIG. 9 is a view showing a conventional disk clamp device;
(a) is a plan view and (b) is a longitudinal sectional view.

[Explanation of symbols]

 20 Disc 30 Turntable 31 Table part 33 Guide member 33c Ball hole 33d, 37d Contact point 34 Spring receiver 35 Steel ball (ball) 35a Point of symmetry 36 Compression coil spring 37 Holding plate 37a Inclined surface 37b Chucking inclined surface 37c Surface 37e Flat 37f Slope up 37g Projection

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int. Cl. ⁷ , DB name) G11B 17/028

Claims (1)

(57) [Claims] A turntable; a guide member projecting from an upper surface of the turntable; a plurality of spring receivers projecting from a lower surface of the turntable; and a plurality of ball holes provided in the guide member. A holding plate having an inclined surface, which is loosely fitted to a boss erected on the guide member, a plurality of balls provided in the plurality of ball holes, and mounted between the holding plate and the spring receiver. A compression coil spring is provided, and the contact point 37 d of the ball disposed in the ball hole with the holding plate and the contact point 33 d with the guide member move outward by 180 degrees with respect to the center O of the ball. In a disk clamping device having an included angle of less than
At the end of the inclined surface of the holding plate, a substantially horizontal flat surface or
A disk clamp device having an inclined surface .