JPH0584573B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Field of Industrial Application The present invention relates to a pick-up transfer device for a disk player that reproduces information recorded on both sides of a disk.

(b) Conventional technology Conventionally, when playing a disc recorded on both sides using a compact disc player or an optical video disc player, the disc is removed once the information on one side has been played, and then turned over. The other eye needed to be regenerated. In this case,
It was extremely cumbersome to operate, and continuous reproduction of both sides was impossible. Therefore, the applicant first filed a patent application in 1983-
In No. 130717, we proposed a technology that enabled continuous playback of both sides of a disk with a single pick-up.

In the prior art, linear guide members are provided on the upper and lower surfaces of the disk along with a guide shaft so that both sides of the disk can be regenerated, and these two guide members are connected by a U-shaped guide to form a pair of guide members. A pick-up guide member is formed, a rack part is formed in one pick-up guide member, a guide groove is formed in the other,
A drive gear that engages with the rack portion and a roller that engages with the guide groove are disposed on the side surface of the support base that supports the pick-up, and the drive gear is driven to move the support base along the guide member. It is characterized by what it did.

(C) Problems to be Solved by the Invention In the prior art, there is no problem with the movement of the linear part that performs simple horizontal movement guided by a guide shaft, but it is difficult to completely move the upward pick-up without a guide shaft. When the support base moves through the U-shaped guide, which must be rotated downward, uneven driving force is applied to the drive gear and rollers, so the drive gear side takes the lead and the support base moves forward. The pair of U-shaped guides will be moved in an inclined state, which may make movement difficult.

(d) Means for solving the problem A pair of drive gears arranged on both sides of the support base that supports the pick-up are connected to a first linear part that guides the movement of the disk in the radial direction on the front surface, and a radial direction on the back surface. The support base is moved by meshing with a rack part continuously formed on the inner surface of a pair of guide means consisting of a second linear part that guides the movement and a U-shaped connecting part that connects both the linear parts. It is characterized by

(E) Effect Since the present invention is configured as described above, since equal driving force is applied to the drive gears on both sides of the support base, it is possible to prevent the support base from tilting to the left or right when moving through the U-shaped portion. It never gets put away.

(F) Embodiment An embodiment of the present invention will be described below with reference to the drawings.

FIG. 2 shows the external appearance of an optical video disc player, in which a disc tray 3 on which discs 2 are set on the front surface of a front panel 1 is horizontally movable between two positions: a storage position and a pull-out position.

3 and 4 are perspective views of essential parts of the pick-up transfer device, FIG. 1 is a front view, and FIG. 5 is a side view. A pick-up 4 and a feed motor 5 are fixed on a support base 6.
A form gear 7 is fixed to the motor shaft. A worm wheel 8 is pivotally supported on the left side wall 6a of the support base 6 so as to mesh with the worm gear 7. Relay gears 10 and 11 fixed to both ends of a shaft 9 passing through the left and right side walls 6a and 6b mesh with the worm wheel 8, and
Pinion (drive gear) 1 pivotally supported by c and 6d
2 and 13 are in mesh with the relay gears 10 and 11. Rollers 14 and 15 are fixed coaxially to the outside of the pinions 12 and 13, and furthermore, the side surface 6d
A roller 16 having the same shape as the roller 15 is pivotally supported at the same height.

17 and 18 are racks that mesh with the pinions 12 and 13, and lower straight parts (second straight parts) 19 and 20 that extend horizontally on the lower chassis 49;
An upper straight part (first straight part) 2 that extends on the lower surface of the upper chassis 21 in parallel with the lower straight parts 19 and 20.
2, 23, and U-shaped connecting portions 24, 25 that connect both linear portions are disposed on the inner surfaces of integrally formed left and right support blocks (guiding means) 26, 27. A rack 17 is provided on the inner surface of the left support block 26.
Similarly, a guide groove 28 into which the roller 14 is fitted is formed in the right support block 27 as well as a guide groove 29 into which the rollers 15 and 16 are fitted.

30, 31 are cylindrical guide poles fixed to the lower and upper chassis 49, 21;
7 and 18 and the straight portions of the guide grooves 28 and 29. This guide pole 30,3
Reference numeral 1 denotes support plates 33 and 3 screwed to the upper and lower chassis 21 and 49, as shown in FIGS. 10 and 11.
2 through cylindrical relay pieces 34 and 35. Further, on the lower surface of the support base 6, there are fitting holes 36 into which the guide poles 30 and 31 are fitted.
However, the side of this fitting hole 36 is cut out to allow the relay pieces 34, 35 to escape.
Note that the disk 2 placed on the disk tray 3
is clamped by a turntable 40 between the upper and lower linear parts 22, 23, 19, and 20.

Next, the operation of the device of this embodiment will be explained.

In the STOP mode, the standby position shown by A in FIG.
The support base 6 is located at a position immediately in front of 4, 25. Therefore, the pickup 4 does not face the disk 2.

In the PLAY mode, the feed motor 5 is driven, and its driving force is transmitted to the rack 1 via the worm gear 7, worm wheel 8, and relay gears 10 and 11.
The signal is transmitted to the pinions 12 and 13 which are in mesh with the pinions 7 and 18, and the position is indicated by B, that is, the lower straight portion 1.
The support base 6 moves to the tip positions 9 and 20. At this position, the pickup 4 faces the innermost periphery of the A side, which is the back surface of the disk 2. After that, the spindle motor 40 starts rotating, and the pick-up 4
The disk 2 is scanned by the . During this scanning, the tracking control circuit of the pickup 4 is activated, and its output is supplied to the feed motor 5, and as the A side is scanned, the support base 6 connects the outer circumferential direction of the disk 2, that is, the lower linear portions 19 and 20. 24 and 25. When the scanning of the A side is completed, the support base 6 connects the connecting portion 24,
25, it reaches the tips of the upper linear parts 22 and 23, and reaches the innermost circumferential position of the surface B, which is the surface of the disk 2. At the same time, the spindle motor 40 rotates in the opposite direction, and picks up the same way as for the surface A. 4 is performed, and the support base 6 moves toward the outer periphery of the disk 2.

While pick-up 4 is scanning side A of disk 2,
That is, the moving state of the lower linear portions 19, 20 of the support base 6 is shown in FIG. When the linear portion moves, the guide ball 30 is in a fitted state with the fitting hole 36 as shown in FIG.
This system aims to improve the tracking accuracy of the pick-up by regulating the height in the vertical direction and preventing wobbling in the vertical and horizontal directions. Note that the rollers 15 and 16 are spaced apart from the inner surface 29a of the guide groove 29.
Further, the roller 14 fits into the guide groove 28 and comes into contact with the inner surface 28a, and together with the guide ball 30, regulates the height of the support base 6. This height regulation makes it possible to maintain a predetermined distance between the pick-up 4 and the disk 2, and also to maintain a stable meshing state between the racks 17 and 18 and the pinions 12 and 13, thereby ensuring that the support base 6 is in a stable straight line. Movement is achieved.

The same applies to movement in the upper linear portions 22 and 23. That is, as shown in FIG.
The height of the support base 6 in the vertical direction is regulated by the guide ball 31 that fits in the guide ball 31 and the roller 14 that fits in the guide groove 28.
8 and the pinions 12, 13 are maintained in a stable state of engagement. Note that the roller 14 is attached to the inner surface 2 of the guide groove 28.
8b, and the rollers 15 and 16 are in contact with the guide groove 29.
It is spaced apart from the inner surface 29b of.

Here, in the fitted state of the guide ball 30 and the fitting hole 36 when the lower linear parts 19, 20 are moved, the load of the support base 6 is applied to the upper surface 36a of the fitting hole 36 as shown by diagonal lines in FIG. It joins the guide ball 30 through the upper straight parts 22, 23.
When the guide ball 31 and the fitting hole 36 are in the fitted state during movement, the load of the support base 6 is applied to the guide ball 31 through the lower surface 36b of the fitting hole 36 as shown by diagonal lines in FIG. Since the outer circumferential surface of the guide balls 36 has the same shape as the outer circumferential surfaces of the guide balls 30 and 31, the guide balls 3 can sufficiently withstand this load.
Stable sliding is possible in the fitting holes 36 of 0 and 31.

The state of movement of the support base 6 at the connecting portions 24 and 25 is shown in FIG. The rollers 14, 15, 16 are fitted into the guide grooves 28, 29, and the support base 6 is gradually rotated from upward to downward by 180° using these three points as fulcrums. This connecting part 24,2
5, the U-shaped guide grooves 28 and 29 are designed to maintain a constant distance from the U-shaped racks 17 and 18, so that the rollers 14 and 15 fit into the guide grooves 28 and 29. Easy 17,
18 and the pinions 12, 13 is maintained, and the support base 6 can also be moved in the connecting portions 26, 27 in synchronization with the rotation of the left and right pinions 12, 13 without tilting in the left-right direction. Become.

In this way, by moving the lower straight parts 19 and 20,
When the scanning of the surface is completed and the scanning of the B surface is completed by moving the upper linear portions 22 and 23 via the connecting portions 24 and 25, the support base 6 returns to the standby position and enters the standby state, and the spindle motor 40 is activated. It stops, the clamp on disk 2 is released, and disk tray 3
is stored and discharged.

Next, a second embodiment will be described with reference to FIGS. 13 to 16. Incidentally, the same parts as in the first embodiment are given the same reference numerals and the explanation thereof will be omitted.

In the first embodiment, the shape of the fitting hole 36 formed in the support base 6 is Ω (ohm), but when the support base 6 is integrally molded from resin or aluminum, the guide balls 30, 31 Extremely high machining accuracy is required to achieve a stable mating condition. In particular, it is difficult to process the complexly shaped portion near the notch 36a. Therefore, the fitting hole 80 is formed in a U-shape as shown in FIG. 14 to prevent the guide balls 30, 31 from rattling in the left-right direction. In addition, the guide balls 30 and 31 are connected to the support plate 3.
2 and 33, but is supported by the chassis from the top and bottom by screwing and fixing it with screws 82 via a fixing member 81 between the chassis and the chassis as shown in FIG. Therefore, while moving in the lower linear portions 19, 20, the rollers 15, 16 touch the inner surface 2 of the guide groove 29 as shown in FIG.
The height of the support base 6 is regulated by rollers 14, 15, and 16. Also, while moving on the upper straight parts 22, 23, the first
As shown in FIG. 5, the rollers 15 and 16 come into contact with the inner surface 29b of the guide groove 29, thereby regulating the height of the support base 6. While the connecting parts 24 and 25 are moving, the same operation as in the first embodiment is performed as shown in FIG. 14.

(G) Effects of the Invention As described above, according to the present invention, the meshing state of the pinion and the rack is maintained stably by the engagement of the guide groove and the roller, so that the pinion can be raised and lowered while rotating the U-shaped connecting part. Even when moving, the support base does not tilt upward on either the left or right side, and stable movement is achieved.

[Brief explanation of the drawing]

1 to 12 relate to the first embodiment of the present invention, in which FIG. 1 is a front view, FIG. 2 is an external perspective view, and FIG.
The figure is a perspective view seen from the right side, Fig. 4 is a perspective view seen from the left side, Fig. 5 is a side view, Fig. 6 is an explanatory view explaining the movement of the support base, and Fig. 7 is a lower linear section. Figure 8 is a diagram explaining movement in the connecting part, Figure 9 is a diagram explaining movement in the upper straight part, and Figure 10 is a diagram explaining movement in the lower straight part. FIG. 11 is a diagram showing the fitted state of the fitting hole and the guide ball when the upper linear part is moved; FIG. 12 is a perspective view showing the fitted state. It is. Figures 13, 14, and 15 are explanatory diagrams of the second embodiment while moving the upper linear part, connecting part, and lower linear part, and Figure 16 is the installation of the guide ball of the second embodiment. It is an explanatory diagram. 2...Disk, 4...Pick up, 6...
Support base, 12, 13... Pinion (drive gear), 17, 18... Rack (part), 19, 20...
...lower linear part (second linear part), 22, 23...
...Upper linear part (first linear part), 24, 25...
...Connecting portion, 26, 27...Left/right support block (guiding means).

Claims (1)

[Scope of Claims] 1. A disk on which information can be recorded on both the front and back sides, a pick-up for recording information on the disk or reproducing information from the disk, and a pair of drives on both sides supporting the pick-up. a support base having a gear; a first linear portion for guiding movement in the radial direction of the front surface of the disk of the pickup; a second linear portion for guiding movement in the radial direction of the back surface; and both of the linear portions. A pick-up transfer device comprising: a pair of guide means comprising a U-shaped connecting portion connecting the two guide means; and a rack portion continuously formed on the inner surface of the pair of guide means and meshing with the drive gear. .