JPH0333976Y2 - - Google Patents

Description

[Detailed Description of the Invention] "Industrial Application Field" The present invention relates to a disk clamping device for clamping a disk such as a compact disk or a video disk to a disk table fixed to a spindle motor during performance.

``Prior Art'' Conventional disc clamping devices of this type include those shown in FIGS. 3 and 4.

In the drawing, A is a disk, and a center hole is formed in the center of the disk. B is disk A
A truncated conical portion C is protruded from the center of the disk table on which the disk A is placed. The center of this disk table B is fixed to a rotation axis E of a spindle motor D.

F is a clamper for pressing the disk A onto the disk table B. A thrust ball G is rotatably arranged at the center of the upper surface of this clamper F, and the above-mentioned truncated conical portion C is arranged at the center of the lower surface of the thrust ball G.
An inverted conical protrusion H that can be freely fitted into an inverted conical recess formed in the center is provided in a protruding manner. In addition, clamper F
is rotatably suspended by a flange portion F1 formed on its outer periphery from a hook fixed to the back surface of an openable/closeable lid (not shown).

Reference numeral I designates an arm-shaped clamper holder, and one end of the clamper holder I is pivoted by a pin (not shown) so that the free end of the clamper holder I can rotate vertically, and the free end is attached downward by a spring. Forced. Further, the free end of this clamper holder I is provided with a thrust ball receiver J that comes into contact with the above-mentioned thrust ball G, but the contact surface of the thrust ball receiver J with the thrust ball G is flat and , are parallel to the plane containing disk A.

Next, the operation of the above embodiment will be explained.
When the disc A is placed on the disc table B during performance, the center hole fits into the truncated conical part C and is positioned. Next, when the clamper F suspended by the hook is lowered onto the disk table B, the inverted conical protrusion H of the clamper F fits into the inverted conical recess of the truncated conical part C, and the elastic force of the spring is applied. As a result, the thrust ball receiver J presses the clamper F via the thrust ball G, and presses and fixes the disk A onto the disk table B. At this time, the thrust ball G makes point contact with the thrust ball receiver J. As a result, when the disk table B is rotated by the spindle motor D, the disk A rotates together with the clamper F.

"Problems to be Solved by the Invention" The conventional disk clamping device is constructed as described above, but when the clamper F performs the clamping operation, an inverted conical An alignment mechanism is provided in which the projection H fits into the inverted conical recess of the truncated cone C.

However, since the above-mentioned alignment mechanism always has a clearance, the rotation of the spindle motor D causes
Clamper F causes miso movement (eccentric rotation),
This could not be completely eliminated.

On the other hand, as shown in FIG.
was sometimes formed. For this reason, when the spindle motor D rotates, the thrust ball G rotates while falling into or riding on the recess K, and this vibration is transmitted to the disk A via the clamper F, causing tracking, focusing, etc. This had an adverse effect on servo control, etc.

"Means for Solving the Problems" Therefore, the present invention was made to solve the above-mentioned drawbacks. In a disk clamping device that includes a clamper that clamps the disk together with a table, a thrust ball receiver that comes into contact with a spherical convex portion provided at the center of the upper surface of the clamper, and a clamper holder that applies a pressing force to the thrust ball receiver, the thrust A concave portion is provided on the contact surface of the ball receiver with the spherical convex portion, and either the spherical convex portion or the thrust ball receiver is configured to be movable in the horizontal direction.

"Configuration of Embodiments" The present invention will be described below based on embodiments shown in the drawings. FIG. 1 shows a longitudinal sectional view of a disk clamping device according to the present invention.

In the above drawing, 1 is a disk such as a compact disk or a video disk, 2 is the center hole thereof, 3 is a disk table on which the disk 1 is placed, and the center hole 2 is fitted in the center of the disk table. A truncated cone portion 4 for positioning the disk 1 is provided in a protruding manner. A rotating shaft 6 of a spindle motor 5 is fixed to the center of the disk table 3.

7 is a clamper for pressing the disk 1 onto the disk table 3. A spherical convex portion 8 made of a ball is rotatably arranged at the center of the upper surface of the clamper 7, and a spherical convex portion 8 made of a ball is rotatably arranged at the center of the lower surface of the clamper 7. An inverted conical protrusion 9 is provided in a protruding manner. Note that the clamper 7 has a flange portion 7a formed on its outer periphery.
It is rotatably suspended from a hook fixed to the back side of a cover (not shown) which can be opened and closed.

Reference numeral 10 denotes an arm-shaped clamper holder, one end of which is not shown, but is attached to the clamper holder 1 by a pin.
The free end of the 0 is pivotally mounted so as to rotate in the vertical direction, and the free end is biased downward by a spring. Further, a thrust ball receiver 11 is fixed to the free end of this clamper holder 10 and is in contact with the spherical convex portion 8, and this thrust ball receiver 11 is movable in the horizontal direction with respect to the clamper holder 10. It is installed. Further, the contact surface of the thrust ball receiver 11 is set to be parallel to the surface including the disk 1 when it comes into contact with the spherical convex portion 8 . Further, a recess 12 having a chevron shape or the like is formed on the contact surface of the thrust ball receiver 7.

"Operation of the invention" Next, the operation of the above embodiment will be explained.
When playing, when the disc 1 is placed on the disc table 3, the center hole 2 is aligned with the truncated cone part 4.
is fitted and positioned. Next, when the clamper 7 suspended by the hook is lowered onto the disk table 3, the inverted conical protrusion 9 of the clamper 7 fits into the inverted conical recess of the truncated cone part 4, and the thrust ball receiver 11 becomes spherical. Clamper 7 via convex portion 8
Press to press and fix the disk 1 onto the disk table 3. At this time, the spherical convex portion 8 comes into contact with the recess 12 formed on the lower surface of the thrust ball receiver 7.

Therefore, when the disk table 3 is rotated by the spindle motor 5, the disk 1 is moved by the clamper 7.
rotates as one. At this time, as described above, since there is a clearance in the alignment mechanism between the truncated conical part 4 and the inverted conical protrusion 9, the clamper 7 causes a misalignment movement (eccentric rotation); The integrated thrust ball receiver 11 moves horizontally following the sliding movement of the clamper 7.

Therefore, even if a recess is formed on the lower surface of the thrust ball receiver 11 as in the conventional case, the spherical convex portion 8 will never fall into or ride on the recess.

"Other Embodiments" FIG. 2 is a vertical cross-sectional view of main parts showing another embodiment. The clamper 7 has a circumferential groove 13 that is open at the center of the upper surface, and a movable plate 14 is formed in the circumferential groove 13.
are arranged so as to be movable in the horizontal direction, and a spherical convex portion 8 is formed by a projection at the center of the upper surface of the movable plate 14 .

Therefore, in the above embodiment, the thrust ball receiver 11 of the clamper 7 moves horizontally in response to the sliding movement, but in this embodiment, the movable plate 14 moves horizontally. Other points are similar to the above embodiments.

"Effects of the Invention" As mentioned above, the present invention includes a disk table 3 that rotates with the disk 1 placed thereon, a clamper 7 that clamps the disk 1 together with the disk table 3,
Spherical convex portion 8 provided at the center of the upper surface of the clamper 7
a thrust ball receiver 11 that comes into contact with the clamper holder 1 that applies a pressing force to the thrust ball receiver 11;
0, a recess 12 is provided on the contact surface of the thrust ball receiver 11 with the spherical protrusion 8, and either the spherical protrusion 8 or the thrust ball receiver 11 can be moved freely in the horizontal direction. It is composed of

Therefore, even if the clamper 7 causes eccentric movement, either the spherical convex portion 8 or the thrust ball receiver 11 moves in the horizontal direction to absorb it, thereby preventing the generation of vibrations that would adversely affect the disk 1. Can be removed.

[Brief explanation of the drawing]

FIG. 1 is a vertical cross-sectional view of a disk clamping device according to the present invention, FIG. 2 is a vertical cross-sectional view showing the main parts of another embodiment of the same clamping device, and FIG. 3 is a vertical cross-sectional view of a conventional disk clamping device. 4 are back views showing the components of the disk clamp device. 1...Disk, 3...Disk table, 5
...Spindle motor, 7...Clamper, 8...
... Spherical convex portion, 10... Clamper holder, 11...
Thrust ball receiver, 12... recess.

Claims (1)

[Scope of utility model registration request] A disk table that rotates with a disk placed thereon, a clamper that clamps the disk together with the disk table, a thrust ball receiver that comes into contact with a spherical convex portion provided at the center of the upper surface of the clamper, and a pressing force applied to the thrust ball receiver. In a disk clamp device equipped with a clamper holder, a recess is provided in the contact surface with the spherical convex portion of the thrust ball receiver,
A disk clamp device characterized in that either a spherical convex portion or a thrust ball receiver is configured to be movable in the horizontal direction.