JPH0416275Y2 - - Google Patents

Description

[Detailed description of the invention] (a) Industrial application field The present invention relates to a disk clamping device for holding a disk on a turntable by pressure, and in particular for reproducing signals recorded on a disk using an optical pickup. The present invention relates to a disk clamp device suitable for use in an optical disk player.

(B) Prior Art An optical disk player is known in which a disk is placed on a slide table that slides in the horizontal direction and a signal recorded on the disk is reproduced using an optical pickup. The disc player includes a disc clamp device that presses and holds the disc placed on the slide table on a turntable for rotating the disc during playback. It is described in 1986-139186.

(c) Problems to be solved by the invention The disc clamping device shown in the above-mentioned publication uses a coil spring to impart elasticity to the chucking mechanism, which is the pressing part that presses the disc against the turntable. Therefore, a guide member and a bearing were required to hold the coil spring in a predetermined position, and a large number of other parts were also required. For that reason,
The disk clamping device described above is disadvantageous in terms of workability and cost.

(d) Means for Solving the Problems The present invention has been developed in view of the above-mentioned points, and includes a disc that is loosely fitted into the mounting hole of the clamp plate and is placed between the turntable and the bottom surface. a chucking member having a pressing portion for pressing the chuck and a recess formed in the center of the upper surface; a ball bearing inserted into the recess of the chucking member and serving as a rotational center point of the chucking member; It is characterized in that it has a plate spring which is fixed to the clamp plate and whose other end presses against the ball bearing.

(e) Effect The present invention applies elastic force to the chucking member through pressure contact between a leaf spring and a ball bearing, so that when the clamp plate is in the clamping position, the chucking member is securely brought into contact with the disk surface. It was designed to look like this.

(F) Embodiment Figure 1 shows an embodiment of the present invention, in which 1 is supported by a roller 2, and is moved between the attachment/detachment position where the disk is attached/detached and the playback position where the disk is regenerated. A slide table capable of sliding in the horizontal direction; 3 is a first gear having a first tooth row 3a that meshes with a rack 1a formed on the back surface of the slide table 1; 4 is a first gear on the slide table 1; A mounted disk; 5 is a turntable for rotating the disk 4; 6 is the disk 4;
a clamp plate 7 for crimping the turntable 5 onto the turntable 5;
a disk 4 mounted at a position facing the turntable 5 and disposed on the lower surface between the turntable 5 and the turntable 5;
a chucking member having a pressing portion 7a for pressing the chuck member 7 and a recess 7b formed in the center of the upper surface; 8 is a ball bearing inserted into the recess 7b of the chucking member 7; and 9 is a ball bearing whose one end is connected to the clamp plate 6. It is a plate spring which is fixed to the ball bearing 8 and whose other end presses against the ball bearing 8.

The chucking member 7 is made of a synthetic resin material, and as shown in the partially exploded view of FIG. 2, an elastic piece 7c is formed on the outer periphery, and a claw 7d is formed at the tip of the elastic piece 7c. The chucking member 7 is loosely fitted to the edge of a circular mounting hole 6a formed in the clamp plate 6 so that the pawl 7d is locked, and the upper center of the chucking member 7 is attached via a ball bearing 8. It is pressed by a leaf spring 9. Also,
As shown in FIG. 3, the clamp plate 6 has protrusions 6b and 6c on both sides, respectively.
A guide pin 6d is provided that projects from a straight line connecting the projection 6c and the projection 6c. And the protrusion 6
b and 6c are fitted into the recesses 11a and 12a of the bosses 11 and 12, respectively, set on the chassis 10, and the clamp plate 6 is fitted into the recesses 11a and 12a of the bosses 11 and 12, respectively.
It is configured to be rotatable around a straight line connecting the points c. Furthermore, as shown in FIG. 4, the first gear 3 has a second tooth row 3b formed on its outer circumference, which meshes with a second gear 14 fixed to the rotating shaft 13a of the motor 13 serving as a drive source. A guide groove 3d having a cam portion 3c with a different diameter between the first tooth row 3a and the second tooth row 3b
is formed, and as shown in the figure, the guide groove 3
A guide pin 6d of the clamp plate 6 is inserted into the hole d.

Now, the slide table 1 is in the attachment/detachment position, and when the disk 4 is placed on the disk placement portion 1b and the opening/closing lever (not shown) is pressed, the motor 13 starts rotating in the direction of arrow A. The rotation of the motor 13 in the direction of arrow A is transmitted to the second tooth row 3b of the first gear 3 via the second gear 14, causing the first gear 3 to rotate in the direction of arrow B. The rotation of the first gear 3 in the direction of arrow B is transmitted to the rack 1a formed on the slide table 1, so the slide table 1 slides in the direction of arrow C and starts moving to the playback position. . At this time, the guide pin 6d of the clamp plate 6 is connected to the cam portion 3c of the guide groove 3d of the first gear 3.
Therefore, the clamp plate 6 is in an unclamped position in which the chucking member 7 is separated from the turntable 5, as shown in FIG. Then, when the first gear 3 rotates by a predetermined angle and the slide table 1 reaches the playback position, the notch 3 formed in the first tooth row 3a of the first gear 3
Because of this, the meshing between the first tooth row 3a and the rack 1a is released, and the sliding movement of the slide table 1 is stopped.

Thereafter, when the first gear 3 is further rotated by the motor 13, the guide pin 6d of the clamp plate 6
reaches the cam portion 3c of the guide groove 3d, and the guide pin 6d is pressed in the direction of arrow D by the cam portion 3c. Therefore, the clamp plate 6 starts rotating in the direction of the arrow E around the axis based on the principle of leverage. When the clamp plate 6 starts rotating in the direction of arrow E, the disk 4 starts to descend onto the turntable 5 and the pressing portion 7a of the chucking member 7 comes into contact with the disk 4. and,
By the subsequent rotation of the clamp plate 6 in the direction of the arrow E, the disk 4 is lowered onto the turntable 5, the pressing portion 7a presses the disk 4 from above, and the clamp plate 6 is rotated as shown in FIG. As shown in FIG. 3, the disc 4 is moved to the clamp position by the chucking member 7, in which the disc 4 is pressed onto the turntable 5. At this time, the chucking member 7 is displacing upward by curving the leaf spring 9, so a drag force is generated in the leaf spring 9 in the direction of pressing the disk 4, and the chucking member 7 The locking of the claw 7d of the elastic piece 7c to the edge of the mounting hole 6a of the clamp plate 6 is released, and the chucking member 7 is supported at one point at the center of the upper surface via the ball bearing 8. , pressing portions 7a corresponding to the four surfaces of the disk.
becomes inclined. Therefore, the disc 4 is reliably crimped and fixed onto the turntable 5 by the chucking member 7.

Next, the assembly of the main parts of the disk clamp device according to the present invention will be explained with reference to FIG. 2. First, one end of the leaf spring 9 is fixed to the clamp plate 6 with a screw 15. At this time, the other end of the leaf spring 9 protrudes from the center of the mounting hole 6a of the clamp plate 6. Next, the recess 7b of the chucking member 7 is coated with silicone grease for smooth operation.
inserts the ball bearing 8. At this time, the ball bearing 8 is locked in the recess 7b by the adhesive force of the silicone grease. Then, the chucking member 7 is pressed from the back surface of the clamp plate 6 against the elastic force of the leaf spring 9 and the elastic force of the elastic piece 7c of the catching member 7, and is fitted into the mounting hole 6a of the clamp plate 6. assembly is completed. In this case, the diameter of the mounting hole 6a is made slightly larger than the diameter of the upper surface of the chucking member 7 so that the chucking member 7 can rotate freely, and the leaf spring 9 and the ball bearing 8 are Since both are made of metal, the chucking member 7 rotates very smoothly when the disk 4 is being played back, with the clamp plate 6 in the clamp position and the chucking member 7 supported at one point at the center of the top surface. , so as not to prevent the rotation of the disk 4.

(g) Effects of the invention As described above, according to the invention, a disk clamping device with a simple configuration can be provided, and in particular, a mounting hole is formed in the clamp plate, and a tip is provided in the chucking member made of synthetic resin. A plurality of elastic pieces having claws are formed upward from the outer periphery, and by pressing the chucking member to fit into the mounting hole against the elastic force of the elastic pieces, the claws of the elastic pieces are pressed against the elastic force of the elastic pieces. Since it is configured to be locked to the edge of the attachment hole, the work of attaching the chucking member to the clamp plate can be greatly simplified.

[Brief explanation of drawings]

Fig. 1 shows an embodiment of the present invention, and Fig. 1 is a cross-sectional view showing a state in which the clamp plate is in the non-clamped position;
The figure is a developed view of the main parts, Figure 3 is a perspective view showing the clamp plate, Figure 4 is a plan view for explanation, and Figure 5 is a sectional view showing the clamp plate in the clamp position. . Explanation of main figure numbers, 1...Slide table, 5
...Turntable, 6...Clamp plate, 7...
Chucking member, 7a...Press portion, 7b...Concave portion, 8...Ball bearing, 9...Plate spring.

Claims (1)

[Scope of utility model registration request] A disk clamp device for crimping and holding a disk on a turntable includes a circular mounting hole mounted on the chassis so as to be movable between a clamped position and a non-clamped position, and located at a position facing the turntable. is formed, and a pressing part is formed on the lower surface of the clamp plate to press the disk disposed between the turntable, and a recessed part is formed in the center of the upper surface, and an elastic member having a claw at the tip. A chucking member made of synthetic resin having a plurality of pieces formed upward from the outer periphery, a ball bearing inserted into a recess of the chucking member and serving as a rotational center point of the chucking member, and one end of which is connected to the clamp plate. and a plate spring whose other end presses and abuts the ball bearing, and the elastic piece is pressed against the elastic force of the elastic piece so as to fit the chucking member into the mounting hole. A disk clamp device characterized in that the chucking member is attached to the clamp plate by locking a claw on the edge of the attachment hole.