JPH079253Y2 - Pickup adjustment device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a pickup adjusting device in a disc player that records or reproduces information on both sides of a disc such as a laser video disc.

<Prior Art> Generally, in a disc player, a pickup for reproducing and recording information on the disc is formed so that the disc is scanned by being placed on a support and moved from the inner peripheral surface to the outer peripheral surface of the disc. ing. In particular, recently, there has been proposed one in which one pickup is reversely transferred to both sides of the disc to enable continuous reproduction on both sides of the disc.

<Problems to be solved by the invention> By the way, although the pickup is always required to have a proper scanning angle set in advance with respect to the scanning surface of the disc, the proper scanning angle may be caused by deformation or distortion of the disc. If an error occurs, it is necessary to correct it promptly. This correction is usually performed by rocking the chassis on which the pickup support is run. However, in the case of a type that can be continuously reproduced by reversing the movement on both sides of the disk, since two chassis are formed vertically, a complicated mechanism is required to individually adjust the swing.

Therefore, the main purpose of the present invention is to drive and adjust one chassis so that the other chassis is driven at the same time, thereby simplifying the structure and reducing the cost.

<Means for Solving the Problem> In order to achieve the above-mentioned object, the present invention reversely transfers a support for supporting a pickup for reproducing and recording information on the disc to the front surface and the back surface of the disc so that both surfaces of the disc are transferred. In a disc player adapted for continuous reproduction, an upper chassis and a lower chassis equipped with a rack for moving the pickup support can swing on a fixed frame at an intermediate portion along the traveling direction of the pickup support. Both chassis are abutted by abutting plates extending in opposite directions at one end thereof and attracted to each other by a spring in the vicinity of the abutting part to maintain a parallel posture, Further, the attitude adjusting cam board is brought into contact with a part of one of the chassis near the contact board.

<Operation> Since the present invention is configured as described above, by rotating the cam board, both chassis swing in the proper direction with the pivot portion as a fulcrum while maintaining their parallel postures, whereby the pickup and the disc are The angle with respect to the scanning plane can be corrected to an appropriate position, and thus, both the upper chassis and the lower chassis can be accurately rocked and corrected by an extremely simple mechanism, and the cost can be reduced.

<Embodiment> An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a perspective view showing a pickup transfer device according to the present invention, and an optical mechanism as a disc player is omitted for easy understanding of the drawing.

Reference numeral 1 is a support body having a pickup 2 and a motor (not shown) for self-propelling, and a driving gear 3 of the support body which is interlockingly connected via intermediate gears 4a, 4b, 4c, 4d. A pair of traveling pinions, that is, a first pinion 5a and a second pinion 5b are provided on one side surface of the support 1.
The two pinions 5a and 5b are formed in the same shape, mesh with each other, and rotate in opposite directions. Reference numerals 6 and 7 denote linear elongated rack bodies fixed to the lower chassis 8 and the upper chassis 9, respectively. The rack bodies 6 and 7 are provided with racks 6a and 7a with which the first pinion 5a meshes. ing.

Further, the rack bodies 6 and 7 are provided with a rail groove 12 into which a traveling roller 11 provided at the tip of the stay 10 of the pickup support 1 fits and travels. At the opposite end of the pickup support 1, traveling rollers 13a and 13b that rotate around the vertical axis are provided. This running roller 13a, 1
3b has a slight height difference between the upper and lower sides, and one running roller 13a is formed so as to run parallel to the rack body by being fitted to a straight rail 14 fixed to the lower chassis 8. The other traveling roller 13b is fitted to the linear rail 15 fixed to the upper chassis 9 so as to travel. Therefore, the pick-up support 1 has the traveling roller 11 at one end and the traveling roller 13 at the other end.
It is supported by a or 13b so that it can run stably.

Thus, the support rollers 13a, 13b are provided with adjusting screws 34a, 34b for adjusting the height positions thereof at their shaft cores, respectively. The grooves 35a and 35b are formed so as to face the upper surface side in a posture in which the respective support rollers 13a and 13b are fitted into the dedicated linear rails 14 or 15. Accordingly, the height position of each of the support rollers 13a and 13b can be easily adjusted by rotating the adjusting screws 34a and 34b from above with a driver.

Reference numerals 16a and 16b denote turntables for receiving the pickup support 1 and reversing it, and are capable of turning 180 degrees about axes 17a and 17b as fulcrums. The one turntable 16a has a horizontal rack portion 18 connected to the racks 6a and 7a in a posture of turning downward or upward, and the rack portion 18 has an intermediate portion where the rack is omitted. Has been done. This omitted portion is indicated by reference numeral 19. Further, the turntable 19 is formed with a groove portion 20 continuous with the rail groove 12. Further, a small-diameter, substantially semi-circular reversing guide rack 32 is provided around the shaft 17a of the rotating plate 16a, and the second pinion 5b is meshed with the reversing guide rack 32. Further, the other turntable 16b is a rail portion 2 connected to the linear rails 14 and 15.
Equipped with 1.

The lower chassis 8 and the upper chassis 9 are pivot pins 22, 23 at an intermediate portion along the traveling direction of the pickup support 1.
Is pivotally supported on the fixed frame 24 by the. The chassis 8 and 9 are abutted by abutting plates 24 and 25 extending in opposite directions at one end, and are attracted to each other by a spring 26 in the vicinity of the abutting parts to maintain their parallel postures. . A posture adjusting cam plate 28 is abutted on a pin 27 formed at the end of the lower chassis 8 on which the contact plate is provided. This cam plate 28 is an intermediate gear.
It is connected to a worm gear 31 of the servomotor 30 via 29a, 29b, 29c.

Incidentally, reference numeral 33 in the figure denotes a laser disk.

Next, the operation will be described.

In the play mode, the pick-up support 1 is driven by its motor to rotate the pinion 5a and the rack 6a.
It moves to the inner peripheral portion of the disk 33 by meshing with. At this position, the pickup 2 faces the back surface of the disk, that is, the innermost peripheral portion of the A surface, and scanning of the disk is started. Then, the tracking control circuit of the pickup operates to move the pickup support 1 in the outer peripheral direction of the disc, that is, in the direction of the rotary plates 16a and 16b. When the scanning of the surface A of the disk is completed, the first pinion 5a of the pickup support 1 is transferred to the rack portion 18 of the rotating board 16a, and the traveling roller 11 is moved from the rail groove 12 to the rail portion 18 of the rotating board. At the same time, the second pinion 5b is a semicircular inverted guide rack
Mesh with 32. Since the rack portion 18 of the turntable 16a is cut away in the middle portion, the first pinion 5a becomes idle here, and the second pinion 5b and the reversing guide rack 32 mesh with each other along the arc surface thereof. And move upwards. At this time, in the turntable 16a, the traveling roller 11 also has a rail portion 18 of the turntable.
Since it has been moved inward, both are turned and inverted upward. Further, since the supporting roller 13a is also moved to and fitted into the rail portion 21 of the other turntable 16b, the turntable 16b is turned upside down in synchronization with the turntable 16a.

After the reversal, the first pinion 5a of the pickup support 1 is transferred to the upper rack 7a, self-propelled to a position in the vicinity of the inner peripheral surface of the B surface of the disk 33, and is scanned by the pickup 2 in the same manner as the A surface.

During scanning by the pickup 2, when an error occurs in the proper relative angle between the pickup 2 and the disk surface due to disk distortion or the like, the attitude control circuit is activated by detecting this error and the servo motor 30 is driven. To rotate the cam board 28. By the rotation of the cam board 28, the contact position with the pin 27 of the lower chassis 8 is changed and the lower chassis 8
In addition, while the upper chassis 9 is held in the parallel posture, the upper shaft 9 is swung in the proper direction with the pivot pins 22 and 23 as the fulcrums, thereby correcting the proper angle between the pickup 2 and the disc scanning surface.

Although the embodiments considered to be typical of the present invention have been described above, the present invention is not necessarily limited to the structure of the above-described embodiments, and has the constituent features of the present invention and achieves the object of the present invention. The present invention can be appropriately modified and implemented within a range having the following effects.

<Effect of the Invention> As described above, according to the present invention, the upper chassis and the lower chassis are swingably supported on the fixed frame at an intermediate portion along the traveling direction of the pickup support, and both chassis are mutually connected at one end thereof. Abutting plates extending in opposite directions are brought into contact with each other, and springs are attracted to each other in the vicinity of the abutting portion to maintain the parallel postures of both chassis,
Further, since the attitude adjusting cam board is brought into contact with a part of one of the chassis near the contact board, both chassis maintain their parallel attitude by rotating this cam board. In this state, it swings in the proper direction with the pivot as the fulcrum, which allows the angle between the pickup and the disc scanning surface to be corrected to the proper position, thus making it possible to use either the upper chassis or the lower chassis with an extremely simple mechanism. Also, there is an effect that the swing can be corrected accurately and the cost can be reduced.

[Brief description of drawings]

The drawings show one embodiment of the present invention. Fig. 1 is a schematic perspective view, Fig. 2 is a side sectional view, and Fig. 3 is a section taken along the line III-III in Fig. 2. FIG. 4 is an enlarged perspective view showing a supporting roller portion of the pickup support, and FIGS. 5 to 7 are schematic side views showing the reversing operation of the pickup support. 1 …… Pickup support 2 …… Pickup 8 …… Upper chassis 9 …… Lower chassis 22,23 …… Pivot pins 24,25 …… Abutment plate 26 …… Spring 28 …… Cam board

Claims (1)

[Scope of utility model registration request] 1. A disc player in which a support for supporting a pickup for reproducing and recording information on the disc is reversely transferred to a front surface and a back surface of the disc to continuously reproduce both surfaces of the disc. The upper chassis and the lower chassis having a rack for moving the chassis are pivotally supported by a fixed frame at an intermediate portion along the traveling direction of the pickup support body, and both chassis are opposed to each other at one end thereof. Are abutted by a contact plate extending in the direction of the arrow and are attracted to each other by a spring in the vicinity of the contact part to maintain a parallel posture, and a part of one of the chassis is located near the contact plate. A pickup adjusting device characterized in that a posture adjusting cam board is abutted on the.