KR940009468B1 - Disc clamping apparatus for optical disc player - Google Patents

Abstract

The apparatus executes precise clamping activity, to improve performance by changing the structure of the upper clamping unit. The apparatus comprises; a lower clamp unit clamping A side of the disk consisting of a main plate, a spindle motor, a turn table inserting in shaft, a lower clamp equipped elastically by a spring and an iron plate; an upper clamping unit clamping B side of the disk.

Description

Disc clamp device of optical disc player

1 is a cross-sectional view showing the structure of a conventional disc clamp device, (a) is a state of clamping the A surface of the disk, (b) is a state of clamping the B surface of the disk.

2 is a cross-sectional view showing the configuration of the disk clamp device of the present invention, (a) is a state where the A surface of the disk is clamped, and (b) is a state where the B surface of the disk is clamped.

3 is a cross sectional view of a main portion of the disc clamp device of the present invention.

4 is an enlarged view of portion “A” of FIG. 2B;

* Explanation of symbols for main parts of the drawings

5 lever 11 body

16: insertion groove 17: regulation

18: electromagnet 19: hanging piece

22: upper clamp 26: locking groove

27, 28: contact 29, 29a: power supply coil spring

The present invention relates to a disc clamp device of an optical disc player, and in particular, in a double clamp device, it is possible to perform a simple and accurate clamping operation.

In general, an optical disc player places an optical disc (hereinafter referred to as a "disc") above the tray, and then moves the tray horizontally and vertically into the machine, so that the disc placed on the tray rests on the turntable and rotates together when the turntable rotates. When the pickup is moved to the lower and upper surfaces of the disk to scan the laser to obtain the image and sound recorded on the disk. The disks are made of upper and lower surfaces, that is, A and B surfaces by adhering two disks for double-sided reproduction, and generally allow concentricity errors of A and B surfaces to be 0.2 mm or less. Accordingly, due to the concentricity error between the A and B planes, the A and B planes do not have the same radius with respect to the shaft of the turntable, and thus have a clamp device that can select and hold the A and B planes during regeneration.

Conventionally, as shown in FIG. 1, the lower clamping means is installed on the shaft 53 of the spindle motor 52 fixed to the main plate 51 to hold the A surface of the disk 54. It is provided below the lever 55 is composed of the upper clamping means for holding the B surface of the disk 54. The lower clamping means is a turntable 56 press-fitted to the shaft 53 to be rotated, a lower clamp 58 elastically installed by the spring 57 in the turntable to be able to move up and down, and the lower clamp Formed on the outer circumferential surface of the lower clamp 58 to determine the position of the A surface of the disk 54 when the lower clamp 58 is elevated, and attached to the turntable 56 so that the lower clamp 58 is above a predetermined height. Consists of the iron piece 60 to prevent lifting.

In addition, the upper clamping means is a lower portion of the body 62 is connected to the upper clamp 61, the elastic piece is installed elastically with a spring (63) in the body, the upper piece of the engaging piece 64 is screwed with a screw 65 ( 67, a pressing plate 67 elastically installed in the body 62 by a spring 63, and a pressing piece 68 elastically installed below the pressing plate to press the B surface of the disk 54. The upper clamp 61 is inserted into the hole 69 formed in the pressing plate 67 and moved between the groove 70 formed in the body and the groove 71 formed in the upper clamp 61 when the body 62 moves up and down. Ball bearing 72 to control the rise and fall of the fixed plate and the magnet plate 73 is fixed to the lower side of the pressing plate 67 is attached to the iron piece 60 fixed to the turntable 56 when clamping ( 74) and the B surface of the disc 54 as the upper clamp 61 is lowered on the outer circumferential surface of the upper clamp 61. It consists of the inclined surface 75 which determines a position.

Therefore, when the disk 54 is seated on the turntable 56 by the loading means, A-side clamping is automatically performed. In this case, as shown in FIG. 1A of the accompanying drawings, by the spring 57 in the turntable 56. Since the lower clamp 58 is raised, the inclined surface 59 formed on the outer circumferential surface of the lower clamp 58 holds the A surface of the disk 54. Accordingly, the A surface of the disk 54 is the spindle motor ( The concentricity becomes constant about the shaft 53 of 52. At this time, the iron piece 60 fixed to the turntable 56 is connected to the magnet 73 constituting the upper clamping means, and the pressing piece 68 provided below the pressing plate 67 elastically faces the B surface of the disk 54. It is in a state of being pressed. In this manner, when the A surface of the disk 54 is clamped, the spindle motor 52 attached to the main plate 51 is driven to rotate the turntable 56 press-fitted to the shaft 53, thereby rotating the disk 54. By rotating, the laser is scanned on the rotated disk by a pickup (not shown) to reproduce the A surface of the disk 54.

In addition, when playing the B surface of the disk 54, the lever 55 is lowered in accordance with the B surface regeneration input signal, and the body 62 constituting the upper clamping means is pressed. Accordingly, the body 62 of the spring 63 The upper clamp 61 and the working piece 66 connected to the body 62 are also lowered while being lowered downward while being elastic, which is inserted into the hole 69 of the pressing plate 67 and formed in the upper clamp 62. The ball bearing 72 located in the groove 70 is moved toward the groove 70 formed inside the body 62 so that the body 62 is lifted by the restoring force of the spring 63 when the B surface of the disk 54 is regenerated. Prevent it.

On the other hand, when the working piece 66 is lowered, the working piece is guided to the shaft 53 of the spindle motor 52 and pushes the lower clamp 58 and accordingly the inclined surface 54 formed on the outer circumferential surface of the lower clamp 58. The inclined surface 75 formed on the outer circumferential surface of the upper clamp 61 while being separated from the A surface of the disk 54 holds the B surface of the disk 54, thereby clamping the B surface of the disk 54. At this time, the magnet 73 continues to be connected to the iron piece 60 as in the case of A-side clamping. Then, when playing back the B side of the disk 54 and playing the A side again, the lever 55 may be lifted again. At this time, as the lever 55 is raised, the screw 65 is fixed to the upper side of the pressing piece 16. Since the lifting piece 64 is lifted up, the pressing piece 66 and the body 62 are raised together with the restoring force of the spring 63, and thus the upper clamp 61 is raised. At this time, the ball bearing 72, which is inserted into the hole 69 of the pressing plate 67 and enters the groove 70 formed in the body 62, enters the groove 71 formed in the upper clamp 61, and the upper clamp 61 ) Will be determined.

On the other hand, as the operating piece 66 is raised, the pressing force of the lower clamp 58 is released, and accordingly the lower clamp 58 is raised to hold the A surface of the disk 54 again.

However, such a conventional disk clamp device has a problem in that assembly is difficult, of course, if the number of parts is increased due to the complicated structure of the upper clamping means, and of course, the assembly is difficult, and the operation is inaccurate, resulting in a defect of the device.

The present invention has been made in view of such a conventional problem, and in particular, by changing the structure of the upper clamping means to reduce the cost, improve assembly performance and to perform a more accurate clamping operation to improve the performance of the device There is a purpose.

In order to achieve the above object, a disc clamp device of an optical disc player of the present invention is provided. Hereinafter, the present invention will be described in more detail with reference to FIGS. 2 to 4 of the accompanying drawings. Same as

2 is a cross-sectional view showing the configuration of the disk clamping device of the present invention, showing a state where the disks A and B are clamped, and FIG. 3 is a cross sectional view of the main part. The present invention is installed on the shaft (3) of the spindle motor (2) fixed to the main plate (1) is raised and lowered by the lower clamping means and the loading means for clamping the A surface of the disk (4) (5) is provided below the upper clamping means for clamping the B surface of the disk (4), the lower clamping means is a turntable (6) pressed into the shaft (3), the spring in the turntable The lower clamp 8 elastically installed at (7), the inclined surface 9 formed on the outer circumferential surface of the lower clamp, and the iron piece 10 attached to the turntable 6 is the same as in the prior art.

Hereinafter, the configuration of the upper clamping means of the present invention will be described.

A plurality of grooves 12 are formed on the outer circumferential surface of the body 11, and a plurality of protrusions 14 are formed on the inner side of the pressing plate 13 so that each of the protrusions is formed in the groove 12 formed in the body 11. By inserting the spring (15) and elastically installed to form a plurality of insertion holes 16 to penetrate from the outside of the body 11 to the inside to fit the restriction piece (17) into the insertion hole (16) 17) can be connected or short-circuited with the electromagnet by turning the electromagnet 18 on and off.

In addition, the retaining plate 19 is fixed upward in the body 11, and the shaft bar 23 formed with the upper clamp 22 having the pressing piece 20 and the inclined surface 21 is resilient to the spring 24. The permanent magnet 25 is fixed together with the iron plate 10 fixed to the turntable 6 when the disk is clamped. A plurality of locking grooves 26 are provided on the outer circumferential surface of the upper clamp 22. It is formed to restrict the lifting of the upper clamp 22 as the control piece 17 is selectively fitted into the locking groove. In addition, the contact points 27 and 28 are formed at the lever 5 and the engaging plate 19, respectively, and when the contacts 27 and 28 are connected, power is supplied to the electromagnet via the power supply coil springs 29 and 29a. (18). The present invention configured as described above has a radius about the shaft 3 of the spindle motor 2 fixed to the main plate 1 when the disk A plays on the surface A when the disk A plays on the surface B. Only when these directions are constant, clear sound and clear picture quality can be obtained during playback.

Therefore, when the disk 4 is seated on the turntable 6 by the loading means, as shown in FIG. 2A, the A surface is immediately reproducible, and thus the A side clamping of the disk 4 is performed by the lower clamping means. However, the action of clamping the A surface of the disk 4 by the lower clamping means is the same as the conventional one, and will be omitted and the operation of the upper clamping means will be described. When playing the B side of the disc 4, the B side should be clamped. In this case, the lever 5 moves downward while pushing the locking plate 19 fixed above the shaft 23. Therefore, the shaft bar 23 and the upper clamp 22 is moved downward while receiving the elasticity of the spring (24). When the upper clamp 22 is moved downward, the restriction piece 17 fitted into the insertion hole 16 formed in the body 11 continues downward while being connected to the outer circumferential surface of the upper clamp 22 by its own weight. When the upper clamp 22 descends to a position where the upper clamp 22 can be clamped on the B surface of the disk 4, the locking groove 26 and the body are formed on the outer circumferential surface of the upper clamp 4. Coincides with the insertion groove (16) formed in the (11), wherein the restriction piece (17) in the insertion groove (16) formed in the body (11) moves toward the locking groove (26) formed in the upper clamp (22) by its own weight. do.

In this way, when the upper clamp 22 is moved downward, the inclined surface 21 formed on the outer circumferential surface of the upper clamp 22 clamps the B surface of the disk 4 so that the B surface disk is the spindle motor 2. The shaft 3 of the shaft to achieve a constant concentricity and at the same time the pressing piece 20 is to press the lower clamp 8 installed in the turntable 6, so that the lower clamp 8 receives the elasticity of the spring (7) Moved downward, the A side clamping of the disk 4 is released.

On the other hand, in the state where the B surface clamping of the disk 4 is completed by the upper clamp 22, the lever 5 does not continuously push the latching plate 19, so the upper clamp 22 receives the restoring force of the spring 24. ) Is going to rise, but because the restriction piece 17 enters into the engaging groove 26 formed in the upper clamp 22, the upper clamp 22 does not move upward and continues to clamp the B side of the disk 4 Doing. And the pressing plate 13 is fitted to the plurality of grooves 12 formed on the circumferential surface of the body 11 elastically installed by the spring 15 has a permanent magnet 25 fixed to the lower side of the body 11 In the same manner as when clamping the A side of the disk 4, since it is continuously grounded with the iron piece 10 fixed to the turntable 6, the B surface of the disk 4 is continuously pressed even when the B surface of the disk 4 is clamped. The disk 4, which is rotated when the turntable 6 rotates in accordance with the driving of the spindle motor 2 fixed to the main plate 1 during regeneration, is prevented from being pulled out of the turntable 6 by centrifugal force. This state is the same as that of the second drawing of the accompanying drawings.

As described above, when clamping the B surface of the disk 4 and then clamping the A surface again, the lever 5 moves upward and once connected to the locking plate 19, the lever 5 and the locking plate 19 Contacts 27 and 28 formed at the power supply are connected to the electromagnet 18 through the power supply coil springs 29 and 29a. The magnetic force is generated in the electromagnet and thus one end is inserted into the engaging groove 26 formed in the upper clamp 22 so that the regulating piece 17 restricting the lifting of the upper clamp 22 is like the dashed line in FIG. 4. Since the upper clamp 22 is moved upward by the restoring force of the spring 24 and moved to the electromagnet 18 toward the electromagnet 18, the lower clamp 8, which was pressed by the pressing piece 20, is also turned the turntable 6. Under the restoring force of the spring (7) inside Since the B side clamping of the disk 4 is released, the A side clamping is performed again.

All of the actions not described below are performed in reverse with the clamping of the B surface of the disk 4. Therefore, the present invention enables accurate clamping operation even by a simple structure to improve the performance of the device.

Claims (2)

A plurality of insertion grooves 16 formed on the circumferential surface of the body 11 and a clamping means for holding the B surface (upper surface) of the disk 4, and installed in the insertion groove selectively receives power to the magnetic force An electromagnet 18 for generating a top and an axial rod 23 to which the locking plate 19 is fixed are integrated so that the upper surface of the disk 4 can be clamped while the lever 5 moves downward. The clamp 22, a plurality of engaging grooves 26 formed on the circumferential surface of the upper clamp and the engaging grooves 26 formed in the upper clamp 22 while being moved in accordance with the operation of the electromagnet 18 or When the clamping surface B of the disk 4 is formed by the upper clamp 22 and the clamping piece 17 is formed so as to be pulled out of the locking groove, the regulating piece 17 is not supplied as the power is not supplied to the electromagnet 18. The upper clamp 22 is regulated and the disk 4 is driven by the lower clamp 8. If you want to clamp the A-side as the power is supplied to the electromagnet 18, control section 17, the disk clamping device of an optical disc player, characterized in that it gives to release the regulation of the upper clamp (22). 2. The contact plate according to claim 1, wherein contacts 27 and 28 are formed on the latching plate 19 and the lever 5, respectively, and the power supply spring is connected to each of the contacts and the electromagnet 18 to selectively supply power to the electromagnet 18. When the lever 5 is moved downward to clamp the B side of the disk 4 by the upper clamp 22 by connecting to the 29 and 29a, each contact 27 and 28 is shorted. 18) when the lever 5 is moved upward to prevent the power supply to the power supply and to clamp the A surface of the disk 4 by the lower clamp 8, the respective contacts 27 and 28 are contacted. 18) A disc clamp device for an optical disc player that is supplied with power.