JPH087567Y2 - Pickup transfer device - Google Patents

Description

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

<Prior Art> Conventionally, one pickup is reversed and transferred to both sides of a disc to enable continuous reproduction of both sides, for example, is disclosed in Japanese Utility Model Laid-Open No. 63-49667.

In this known device, a U-shaped guide rail extending from the lower side to the upper side of the disc is provided, and a support for supporting the pickup is run along the rail to reproduce both sides of the disc.

<Problems to be solved by the invention> However, in this conventional means, when the support of the pickup is reversed, the pickup travels along the inner surface of the arc portion of the U-shaped guide rail. Since the rails are formed of large arcs whose diameter is equal to the distance between the rails, there is a drawback that the traveling distance becomes long and the time required for reversing becomes long.

Therefore, the main object of the present invention is to provide a pickup transfer device capable of shortening the time required for this reversal to shorten the reproduction switching time to the opposite surface of the disk.

<Means for Solving the Problem> In order to achieve the above object, the present invention provides a support for supporting a pickup for reproducing information from or recording information on a disc, and the support on the front and back surfaces of the disc. The guide mechanism includes a guide mechanism for reversing and transferring and a self-propelling mechanism for self-propelling the support, and the guide mechanism includes a linear lower rack and an upper rack arranged below and above the disk, and this lower portion. Or a reversing means for reversing and transferring the pickup support body that has traveled along the upper rack to the upper or lower rack, and the reversing means receives the support body from the lower rack to the upper rack with the rotation axis as a fulcrum. Or a rotating plate which is turned in reverse from the upper rack toward the lower rack, and has a diameter smaller than the distance between the rotating shaft of the rotating plate and the upper rack or the lower rack, A first traveling pinion and a self-propelled mechanism of the support, which is composed of a substantially semi-circular inverted guide rack formed so as not to rotate around the rotation axis, and which engages with the upper rack or the lower rack. And a second traveling pinion for rotating the turntable with the support placed thereon by rotating in the opposite direction and engaging with the semi-circular rack. .

<Operation> Since the present invention is configured as described above, when the self-propelled pickup support is inverted and transferred from the lower rack to the upper rack or from the upper rack to the lower rack, the small diameter of the small diameter formed around the shaft of the turntable is used. Since the second pinion meshes with the semi-circular inverted guide rack and moves along the outer periphery of the guide rack, the moving distance is longer than that of the conventional guide rack that moves along the guide rack surface that is largely curved in a U shape. Can be shortened and the time required for reversal can be shortened.

<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. Support rollers 13a and 13b that rotate around the vertical axis are provided at the opposite end of the pickup support 1. This support roller 13
The heights of a and 13b are slightly different from each other in the vertical direction, and one of the support rollers 13b is formed so as to run in parallel with the rack body by being fitted to a linear rail 14 fixed to the lower chassis 8. The other supporting roller 13a is fitted to the linear rail 15 fixed to the upper chassis 9 so as to travel. Therefore, the pickup support 1 is supported by the traveling roller 11 at one end thereof and by the support roller 13a or 13b at the other end thereof, so that the pickup supporting body 1 can stably travel. Incidentally, the support rollers 13a, 13b are provided with adjusting screws 34a, 34b for adjusting the height position thereof at their shaft cores, and the driver fitting grooves 35a, 35b of the adjusting screws are provided.
Is a linear rail 14 for which the respective support rollers 13a, 13b are dedicated,
Alternatively, it is formed so as to face the upper surface side in the posture in which it is fitted to 15. Thereby, the support rollers 13a, 13b
In both cases, the height position can be easily adjusted by rotating the adjusting screws 34a and 34b with a screwdriver from above.

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. And one of the turntables 16a is rotated downward or upward,
It has a horizontal rack portion 18 connected to the racks 6a and 7a, and the rack portion 18 has a rack removed in the middle portion. This omitted portion is indicated by reference numeral 19. Further, a groove portion 20 continuous with the rail groove 12 is formed on the turntable 16a. or,
Rotating shaft 17a of rotating plate 16a and upper rack 7a or lower rack 6a
A substantially semicircular reversal guide rack 32 having a diameter smaller than the distance between the reversing guide rack 32 and the second pinion 5b is provided on the reversing guide rack 32 so as not to rotate.
Are engaged with each other. Further, the other turntable 16b is provided with a rail portion 21 connected to the linear rails 14 and 15.

The lower chassis 8 and the upper chassis 9 are pivot pins 22 at an intermediate portion along the traveling direction of the pickup support 1.
It is pivotally supported by a fixed frame 24 by 23.
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. . And lower chassis 8
The attitude adjusting cam board 28 is abutted to the pin 27 formed at the end on the side where the contact plate of the servo motor 30 is provided, and the cam board 28 is a worm of the servomotor 30 via the intermediate gears 29a, 29b, 29c. It is connected to the gear 31.

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

 Next, the operation will be described.

In the play mode, the pickup support 1 is driven by the motor of the pickup to rotate the pinion 5a and move to the rack.
It moves to the inner peripheral portion of the disk 33 by meshing with 6a. 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 turntables 16a and 16b. When the scanning of the surface A of the disc is completed, the first pinion 5a of the pickup support 1 is transferred to the rack portion 18 of the rotating platen 16a, and the traveling roller 11 is moved from the rail groove 12 to the groove portion 20 of the rotating platen, at the same time. The second pinion 5b engages the semi-circular inverted guide rack 32. Since the rack portion 18 of the turntable 16a is omitted in the middle portion, the first pinion 5a is 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, turntable 16
Also in a, since the traveling roller 11 is moved into the groove portion 20 of the turntable, both a are turned and turned upward. The other rotating plate 16
Also in b, since the support roller 13a moves to the rail portion 21 and is fitted therein, the support roller 13a 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 as in 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. Te cam board 28
To turn. 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 and the upper chassis 9 are held in the parallel posture and rocked in the proper direction with the pivot pins 22 and 23 as fulcrums. By doing so, the proper angle between the pickup 2 and the disc scanning surface is corrected.

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, when the self-propelled pickup support is inverted and transferred from the lower rack to the upper rack or from the upper rack to the lower rack, the small-diameter half-diameter formed around the shaft portion of the turntable is used. Since the second pinion meshes with the circular inverted guide rack and moves along the outer periphery of the guide pinion, the movement distance is longer than that of the conventional guide rack that moves along the guide rack surface that is largely curved in a U shape. There is a remarkable effect that it can be shortened and the time required for reversal can be shortened.

[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 5a …… First pinion 5b …… Second pinion 6a …… Lower rack 6b …… Upper rack 16a …… Rotating plate 32 …… Inverted guide rack

Claims (1)

[Scope of utility model registration request] 1. A support for supporting a pickup for reproducing information from or recording information on a disc, a guide mechanism for reversing and transferring the support to a front surface and a back surface of the disc, and the support self-propelled. It consists of a self-propelled mechanism for
The guide mechanism includes linear lower racks and upper racks arranged below and above the discs, and reversing means for reversing and transferring the pickup support body traveling along the lower or upper racks to the upper or lower racks. The reversing means includes a revolving plate that reciprocally pivots from the lower rack to the upper rack or from the upper rack to the lower rack with the pivot being a fulcrum while receiving the support.
A reverse guide rack which has a diameter smaller than the distance between the rotating shaft of the rotating plate and the upper rack or the lower rack and which is formed in a substantially semicircular shape so as not to rotate around the rotating shaft,
The self-propelled mechanism of the support body rotates the turntable in the direction of a direction opposite to the first traveling pinion engaged with the upper rack or the lower rack and the semi-circular rack to engage the turntable with the support body. A transfer device for a pickup including a second traveling pinion for rotating the mounted state.