JPH0739083Y2 - Optical disk clamp device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Field of Industrial Application This invention relates to a clamp device for an optical disc, and more particularly to a clamp device for an optical disc that allows an optical disc to rotate stably.

(B) Problems to be Solved by Prior Art and Invention Conventionally, as a clamp device for an optical disc, for example, one shown in FIG. 3 is known.

In the figure, 1 is a turntable, 2 is an optical disk mounted on the turntable 1, 3 is a projection for positioning the optical disk 2 on the tentable 1, 3a is a recess for positioning the clamper provided on the turntable 1, Reference numeral 4 is a clamper for holding the optical disk 2 on the turntable 1, 4a is a convex portion for positioning the clamper provided on the clamper 4, and 5 is a pressing plate for pressing the clamper 4.

In the optical disk clamping device configured as described above, since the convex portion 4a of the clamper 4 is inserted into the concave portion 3a provided on the turntable 1, the clamper 4 is mounted on the turntable 1.
Accurately positioned on top to rotate.

However, there is a slight play in the shaft 6 of the motor (not shown), which causes the shaft 6 to perform a so-called saw-wood movement, so that the pickup (not shown) will accurately There was a problem that could not be traced to.

The present invention has been made in view of the above points, and an object of the present invention is to provide an optical disk clamping device which eliminates the conventional drawbacks.

(C) Means for Solving the Problem An optical disk clamping device of the present invention is an optical disk including a turntable for mounting an optical disk, an optical disk, a clamper for clamping the turntable, and a pressing plate for pressing the clamper. In the clamping device of 1, the surface of the clamper that comes into contact with the pressing plate is provided with a convex portion whose surface shape is a part of a spherical surface on the rotation axis of the clamper, and the surface of the pressing plate that faces the clamper has a spherical surface shape. Is formed so that the center of the recess of the pressing plate does not coincide with the rotation axis of the clamper.

(D) Action According to the present invention, the surface of the clamper that comes into contact with the pressing plate is provided with a convex portion whose surface shape is a part of a spherical surface on the rotation axis of the clamper. Forms a concave part whose surface shape is a part of a spherical surface,
Since the center of the recess of the pressing plate does not coincide with the rotation axis of the clamper, the rotation axis of the clamper is biased in a fixed direction.

Therefore, the shaft of the motor does not perform the so-called saw-wood movement, so that the optical pickup stably traces the optical disc.

(E) Embodiment An embodiment of the optical disk clamping device of the present invention will be described with reference to FIGS. 1 and 2.

The same parts as those of the conventional example are designated by the same reference numerals and the description thereof will be omitted.

In the figure, 7 is a rotary shaft of the clamper 4, 8 is a convex portion formed on the clamper 4 with the rotary shaft 7 of the clamper 4 as a center so that the surface shape is a part of a spherical surface, and 9 is a convex portion 8 of the clamper 4. Is a concave portion of the pressing plate 5 provided so as to face each other, and the surface shape of the concave portion 9 is also formed to be a part of a spherical surface.

Further, the rotation shaft 7 of the convex portion 8 and the center line 10 of the concave portion 9 formed in the pressing plate 5 do not coincide with each other.

In the optical disk clamping device configured as described above, when the convex portion 8 of the clamper 4 is pressed by the concave portion 9 of the pressing plate 5 as shown in FIG. 2, a lateral pressure f is generated on the convex portion 8.

This side pressure f urges the rotary shaft 7 of the clamper 4.

Therefore, since the rotating shaft 7 of the clamper 4 receives a force in a fixed direction, the shaft 6 of the motor does not cause the scouring motion.

In this invention, the surface shape of the convex portion of the clamper and the surface shape of the concave portion of the pressing plate are formed so as to be a part of the spherical surface, but they are not necessarily spherical surfaces.

Thus, the optical disk clamping device of the present invention is
An optical disk clamping device comprising a turntable for mounting an optical disk, a clamper for clamping the optical disk on the turntable, and a pressing plate for pressing the clamper. A convex part whose surface shape is a part of a spherical surface, and a concave part whose surface shape is a part of a spherical surface is formed on the surface of the pressing plate facing the clamper. Is configured so as not to coincide with the rotation axis of the clamper.

(F) Effect of the Invention Since the optical disk clamping device according to the present invention is configured as described above, the shaft of the motor does not make so-called rubbed tree motion.

Therefore, the optical pickup does not fail to trace the optical disc.

Further, since the pressing plate receives the convex portion of the clamper by the concave portion of the pressing plate, the mechanism becomes compact.

Moreover, since the structure is simple and the cost can be reduced, it has excellent features such as easy implementation.

[Brief description of drawings]

1 and 2 show an embodiment of an optical disk clamping device according to the present invention, FIG. 1 is a sectional view, and FIG. 2 is a sectional view of an essential part for explaining the operation principle of the present invention. FIG. 3 is a sectional view showing a conventional embodiment. Explanation of main symbols 1: Turntable 2: Optical disc 3: Positioning projection 4: Clamper 5: Pressing plate 7: Rotating shaft 8: Convex section 9: Recess f: Side pressure

Claims (1)

[Scope of utility model registration request] 1. A turntable on which an optical disc is mounted,
An optical disk clamping device comprising a clamper for clamping an optical disk on a turntable and a pressing plate for pressing the clamper, wherein the surface of the clamper contacting the pressing plate has a part of spherical surface on the rotation axis of the clamper. Provide a convex part that
A recess is formed on the surface of the pressing plate facing the clamper such that the surface shape is a part of a spherical surface, and the center of the recess of the pressing plate is configured not to coincide with the rotation axis of the clamper. Optical disk clamping device.