JPH0535472Y2 - - Google Patents

Description

[Detailed Description of the Invention] (a) Field of Industrial Application The present invention relates to a disk clamp device for crimping a disk to a turntable.

(B) Prior Art In compact disc players that have become popular in recent years, it is necessary to mount the disc on the turntable without eccentricity in order to read the information on the disc well. On the other hand, in Utility Application No. 75232/1988 (Patent Publication No. 193559/1988 (G11B17/028)), which the applicant previously filed, there is a mechanism for adjusting the eccentricity of the disk in the clamp member that presses the disk onto the turntable. A safety measure is provided. Hereinafter, this kind of disk clamping device will be explained with reference to FIG.

1 is a spindle motor; 2 is a turntable pivotally mounted on the spindle shaft 3 of the spindle motor 1; 4 is a clamp lever rotatably mounted on the chassis in the player; 5 is a loose fitting portion 4a of the clamp lever 4. 6 is a regulating plate that restricts the clamp member 5 from falling off from the loosely fitted portion 4a, 7 is a spring that urges the clamp lever 5 to rotate clockwise, and 8 is a disk. Further, to explain the shape of the clamp member 5 in detail, the clamp member 5 has a disc shape, and an arc-shaped projection 9 is formed at the center of the upper surface, and a loose fitting part 4a of the clamp lever 4 and a loose fitting part 4a of the clamp lever 4 are formed at the periphery of the lower surface. Engaging flange 10
is formed. Further, on the lower surface of the clamp member 5, a truncated conical protrusion 1 whose side surface is inclined is formed at the center thereof.
1 is formed, and furthermore, a mortar-shaped recess 12 and a fitting hole 13 extending into the recess 12 are formed in the center of the protrusion 11.

Next, the operation will be explained. When the disk is attached or detached, the clamp lever 4 is rotated counterclockwise by a control mechanism (not shown), so that the clamp member 5 is separated from the turntable 2. When the disk 8 is placed on the turntable 2 by the disk mounting operation, the clamp lever 4 is biased by the spring 7 and rotated clockwise by the aforementioned control mechanism. When the clamp lever 4 is rotated in this manner, the protrusion 11 of the clamp member 5 touches the disk 8.
At the same time, the fitting hole 13 of the protrusion 11 and the spindle shaft 3 fit together. At this time, if the clamp member 5 and the turntable 2 are eccentric, the slope of the conical recess 12 of the clamp member 5 is pressed against the end of the spindle shaft 3, and the clamp member 5 is brought to the normal position. . Moreover, if the disk 8 is eccentric with respect to the turntable 2, the center hole 8a of the disk 8 will be aligned with the clamp member 5.
The disk 8 is pressed against the inclined side surface of the protrusion 11 of the turntable 2, and the disk 8 is aligned with the turntable 2. The disk 8 is pressed toward the turntable 2 from the protrusion 11 of the clamp member 5 by the bias of the spring 7, and is pressed onto the turntable 2. When the spindle motor 1 is driven, the turntable 2, disk 8, and clamp member 5 rotate together. At this time, the protrusion 9 comes into pressure contact with the regulating plate 6 of the clamp lever 4 and acts as a pivot point for the clamp member 5.

(c) Problems to be Solved by the Invention However, in such a device, the clamping member 5 may tilt as shown by the broken line in FIG. 5 during the disk clamping operation or the disk rotation driving operation. If the clamp member 5 is tilted in this way, the original purpose of preventing eccentricity of the disk cannot be achieved. That is, the fifth
When the clamp member 5 is tilted as indicated by the broken line in the figure, the disk is eccentric to the right in the figure compared to its normal state. Therefore, it becomes difficult to reproduce the disc in a good manner. The present invention attempts to solve such problems.

(d) Means for Solving the Problems In order to solve the above problems, in the present invention, an elastic member that comes into contact with the upper surface of the disk during clamping is arranged on the lower surface of the clamp member so as to surround the center of the clamp member.

(E) Effect When the clamp member is tilted, a difference in deflection occurs in the elastic member that is in contact with the upper surface of the disk, and a difference occurs in the reaction force that the clamp member receives from the elastic member. Therefore, the clamp member is rotated to a horizontal position where the respective reaction forces are balanced due to the difference in reaction forces.

(F) Embodiment An embodiment of the present invention will be described below with reference to the drawings. Incidentally, the same parts as those in FIG. 5 used as the conventional example are given the same reference numerals and explanations are omitted.

That is, in the first embodiment of the present invention, as shown in FIGS. 1 and 2, a ring-shaped elastic pad 14 is bonded to the lower surface of the clamp member 5 so as to be coaxial with the central axis of the clamp member 5. are doing. The pad 14 has a uniform height from the lower surface of the clamp member 5 over its entire circumference. Therefore, when the clamp member 5 is properly assembled parallel to the turntable 2 when clamping the disk as shown in FIG. 1, the pad 14 contracts uniformly over the entire circumference. Therefore, the clamp member 5 receives the reaction force caused by the contraction of the pad 14 evenly on its lower surface, and thus the clamp member 5 is maintained in such a balanced state. Now, if the clamp member 5 is tilted with respect to the turntable 2 for some reason, the pad in the tilted part closer to the disk will contract more, and the reaction force from the pad applied to the clamp member 5 will be reduced. increases in such areas. On the other hand, due to the inclination of the clamp member 5, the pad in the portion of the clamp member spaced apart from the disk surface shrinks less, and the reaction force of the pad applied to the clamp member 5 in that portion is reduced. Therefore, an unbalance occurs in the reaction force from the pad which is applied to the lower surface of the clamp member 5, and a torque is generated in the pad to correct its inclination. In this way, the clamp member 5
is rotated in a direction to correct the inclination, and returns to the position where the pad contracts uniformly as described above.

3 and 4 show a second embodiment of the present invention, in which elastic tongues 15 having protrusions 15a at their tips are arranged radially every 90 degrees instead of the pads in the first embodiment. are doing. That is, in such a case,
When the clamp member 5 is tilted, there will be a difference in the amount of deflection of each tongue piece 15 . . . , and a difference will occur in the reaction force that the clamp member 5 receives. Therefore, the first
As in the embodiment, the clamp member 5 rotates and the inclination of the clamp member 5 is corrected.

Although the operation for correcting the inclination of the clamp member 5 has been described with reference to the two embodiments above, it should be noted that the present invention is not limited to these embodiments.

(g) Effects of the invention According to the disk clamp device of the invention as described above,
Since the inclination of the clamp member is corrected, it is always possible to securely attach the disc to the turntable, making it possible to play the disc in a stable and reliable manner. Furthermore, as the inclination correction means for the clamp member, it is sufficient to simply dispose an elastic member on the clamp member, so the structure is simple and the practical effect is great.

[Brief explanation of the drawing]

1 and 2 are a sectional view of a main part and a bottom view of a clamp member showing a first embodiment of the present invention, and FIGS. 3 and 4 are a sectional view of a main part and a clamp member showing a second embodiment. A bottom view of the member and FIG. 5 are sectional views of essential parts showing a conventional example. 2... Turntable, 4... Clamp lever (moving member), 5... Clamp member, 11... Projection, 14 and 15... Pad and elastic tongue piece (elastic member).

Claims (1)

[Scope of utility model registration request] A disk clamp device for crimping a disk onto a turntable, comprising a moving member that moves toward and away from the upper surface of the turntable, and a moving member that is loosely fitted into the moving member and is in a clamping position close to the turntable. a clamp member that presses the disc against the turntable; a protrusion provided at the center of the clamp member and having an inclined portion on the periphery so that the width gradually becomes narrower toward the tip; an elastic member disposed on the lower surface of the clamp member so as to surround the center of the clamp member;
When the movable member is in the clamp position, the protrusion engages with the center hole of the disk to align the disk with respect to the turntable, and the elastic member abuts against the upper surface of the disk to absorb the elastic reaction force. A disk clamp device characterized in that the inclination of the clamp member is corrected by.