JPH01282739A - Pickup transfer device - Google Patents

Abstract

PURPOSE:To inhibit the whole movable base from being shaky by providing a guide pole adjacently to an engaged position of a gear part to be a cause of a position for generating a large shakiness and the first guide part. CONSTITUTION:Guide poles 16, 17 are provided in parallel on a linear part of a rack 12 and a guide rail 14, and a cylindrical fixing member 18 is interposed between said pole and a chassis and screwed and fixed on the chassis with a screw 19. In such a state, when a pickup 4 is scanning a disk 2, that is, in a state that a movable base 6 is moving in the lower side linear part, the guide pole 16 is in an engaged state to a fitting hole 22. In such a way, shakiness in the vertical and the right and left directions of the pickup 4 is obstructed, and it executes an operation for improving the tracking accuracy of the pickup 4.

Description

DETAILED DESCRIPTION OF THE INVENTION (A) Field of Industrial Application The present invention relates to a double-sided disc reproducing device that uses a single pickup to reproduce information from a disc on which information is recorded on both the front and back sides.

(b) Conventional technology Conventionally, when playing a disc with information recorded on both sides in a compact disc player or optical video disc player, the disc is ejected and turned over once the information on one side has been reproduced. After that, I had to play the other side. However, this method was extremely troublesome and made continuous reproduction of both sides impossible.

In addition, in a player that is not an optical type but uses a record disc with grooves to be played using a playback needle, for example, Japanese Patent Laid-Open No. 567
As disclosed in Japanese Patent No. 7948 (G11B17108), a technique has been proposed that allows both sides of a record to be played back using a single signal reading means.

In this prior art, a guide rail is provided that includes a pair of linear guide sections that are arranged parallel to each surface of the record and opposite to each other, and a U-shaped guide section that connects the two guide sections. The tone arm is fixed to a movable base that moves on this guide rail, and while the tone arm is moving along each linear guide section, each side of the record is played back.When changing the playback surface, a U-shaped guide section is attached to the movable base. It is configured to move from one surface to the other surface via the .

Note that a plurality of rollers are pivotally supported on the movable base, and a rail is sandwiched between at least two IJs of these rollers, and in this state, by applying a driving force to the movable base, the rollers can be rotated on the rails. Because it has an extremely simple configuration that allows the movable base to move along the guide rail, some wobbling occurs in the direction perpendicular to the direction of movement when the movable base moves on the guide rail. However,
In this case, the slight wobble is not a problem. That is, the above-mentioned prior art is intended for a record player that traces the grooves of a record with a playback stylus, and since the playback stylus is supported by a tone arm via a cantilever, it can trace the grooves of a record on each side of the record. This is because even if there is some wobble in the movement of the movable base on the linear guide part during playback, it can be sufficiently absorbed by the tone arm and cantilever.

(c) Problems to be Solved by the Invention However, in an optical disc player that reproduces information without contacting the disc, the position control in the focus direction and tracking direction of the pickup, which is a signal reading means for the disc, is performed using the above-mentioned oblique method. Much higher precision than the player is essential. Therefore, when applying the above-mentioned conventional technology to this optical disc player, if some wobbling occurs when the movable base moves on the linear guide section,
A heavy load is always placed on the focus servo and spindle servo, and there is an extremely high risk that the worst case scenario will occur where the servo exceeds its allowable range and the signal cannot be read.

(d) Means for Solving the Problems The present invention pivots a gear section on one side of a movable base to which a pickup is fixed, a roller pivots on the other side, and a roller on the bottom surface parallel to both sides. A fitting hole is formed, and drive motors for rotationally driving the gear portion are placed on this movable base, and drive motors are arranged parallel to the disk on both sides of the disk.
a pair of first guide parts with which the gear parts engage when the movable base moves linearly; and a pair of first guide parts arranged on both sides of the disk parallel to the disk and parallel to the first guide parts, and arranged parallel to the first guide parts when the movable base moves linearly. a pair of second guide parts to which the rollers move when moving; and a pair of second guide parts arranged parallel to the first and second guide parts on both sides of the disk, and fitted into the fitting holes to guide the linear movement of the movable base. The present invention is characterized in that a pair of guide poles are arranged, and the guide poles are arranged closer to the first guide part than at an intermediate position between the first guide part and the second guide part.

(E) Function Since the present invention is configured as described above, the wobbling of the movable base can be minimized when the pickup moving integrally with the movable base moves linearly, that is, when playing back from any side of the disc.

Particularly in linear movement, the guide pole, which serves as a reference for suppressing backlash in focusing and tracking of the pickup disk, is moved close to the meshing position of the gear part and the first guide part, where a large amount of backlash occurs, so that the entire movable base is moved. This prevents large wobbling.

(F) Embodiment From the following, one embodiment of the present invention, which is not shown in the drawings, will be described.

Figure 2 shows the external appearance of an optical video disc player, with a disc (2) on the front panel (1).
The disc tray (3) on which the disc tray is set is horizontally movable between two positions: a storage position and a pull-out position.

FIG. 1 is a perspective view of the main parts of the pickup feeder, in which the pickup (4) and drive motor (5) are connected to the movable base (6).
) is fixed on top. A bracket (7) is bonded to the right end of the movable base (6), and a gear (8) is fixed to the motor shaft through the bracket (7). Further, a pinion (9) that meshes with a gear (8) is pivotally supported on the bracket shaft (7). Two rollers (10) and (11) are pivotally supported on the left side of the movable base (6).

(12) is a rack that meshes with the pinion (9), and a lower linear portion (12a) that extends horizontally on the lower chassis.
, a 1-side linear portion (12c) extending parallel to the lower linear portion (12a) on the lower surface of the L chassis, and a U-shaped connecting portion (12b) connecting both linear portions are integrated. There is. A guide groove (13) into which the pinion shaft (9a) can be loosely fitted extends in a U-shape on the inner surface of the connecting portion (12b).

(14) is a guide rail on which the rollers (], o) (11) slide, and like the rack (12), the lower straight part (
14a), an upper linear part (14c), and a connecting part (], ib) that connects both the linear parts. Connecting part (1
Similar to the rack (12), a roller shaft (
The guide groove (15) into which the roller (10a) can be loosely fitted also has a guide groove (15) in which the roller (
10) A roller guide groove (116) is formed on the sliding surface of (11).

(16) (17) -L, lower chassis <20) (21)
It is a cylindrical guide pole fixed to the rack (1
2) and the linear portion of the guide rail (14). The guide poles (16) and (17) are screwed and fixed to the chassis by screws (19) with a cylindrical fixing member (18) interposed between them and the chassis, as shown in FIG.

A fitting hole (22) into which the guide pole (16) fits is formed on the lower surface of the movable base (6).
22) is cut out on the lower side for escape of the fixing member (18).

Note that the disc (2) placed on the disc tray (3)
) are the upper and lower linear parts (12a) (14a) and (12c
) (14c) is clamped by the turntable (26).

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

Regarding the 5TOP mode, the movable base (6) is located at the standby position shown by A in Figs. 4 and 5, that is, the position immediately before the connecting parts (12b) (14b) of the lower linear parts (12a) (14a). ing. Therefore, the pickup (4) is connected to the disc (
2) will not be faced.

In the P LAY mode, the drive motor (5) is driven, and its driving force is transmitted to the pinion (9), and the rack (1
2) and the position shown by B, that is, the lower straight part (1
2a) The movable base (6) moves to the tip position of (14a). In this position, the pickup (4) is placed on the disc (2).
) faces the innermost periphery of side A. Thereafter, the disk motor (25) rotates, and the pickup (4) scans the disk (2).

During this scanning, the tracking control circuit of the pickup operates, and its output is supplied to the drive motor (5), and as the A side is scanned, the movable base (6) moves the disk (2).
), that is, the lower linear portions (12a) (14a)
Move the upper part toward the connecting parts (12b) and (14b). When scanning of side A is completed, the movable base (6) moves to the connecting part (
12b) (14b), and then the upper straight part (12c) (
14c) and reaches the innermost circumference position of the B side of the disk (2), at the same time the disk motor (25) rotates in the opposite direction and the pickup (4) scans in the same way as for the A side, making it movable. The base (6) moves toward the outer periphery of the disk (2).

While the pickup (4) is scanning the disk (2), i.e. the lower linear portions (12a) (, 14a) of the movable base (6)
The state of movement is shown in FIG. Guide pole (16
) is in the fitted state with the fitting hole (22) in order to prevent the pickup (4) from shaking in the vertical and horizontal directions and improve the tracking accuracy of the pickup (4). It is. In addition, the upper straight part (12c) (+
The same applies to the movement in 4c).

FIG. 7 shows the moving state of the movable base (6) at the connecting portions (12b) and (14b). The pinion shaft (9a) and roller shaft (10a) loosely fit into the guide grooves (13) and (15),
The mesh between the nion (9) and the rack (12) is maintained, and furthermore, the rollers (10) and (11) are aligned with the roller guide groove (116).
) and will be given movement guidance. When the scanning of the surface of the disk 78 is completed, the movable base (6) returns to the timing position and enters the timing state, the disk motor (25) stops, the disk clamp is released, the disk tray rises, and the disk is removed. .

(G) Effects of the Invention As described above, according to the present invention, when the pickup moves in a straight line, that is, when playing the front and back sides of the disc, the wobbling of the movable base that moves together with the pickup can be minimized. .

In particular, when moving in a straight line, the guide pole, which serves as a reference for stable running by suppressing backlash in the direction perpendicular to the direction of movement, is placed between the gear section and the first guide section, which are the major sources of backlash. By making the gear part and the first guide part close to each other, the backlash caused by the meshing of the gear part and the first guide part spreads over the entire movable base, and is quickly absorbed by the fitting between the guide pole and the fitting hole before it becomes a large backlash. This makes it possible to move in a straight line with minimal rattling, making it possible to read a stable signal from the pickup.

[Brief explanation of the drawing]

All the drawings relate to one embodiment of the present invention, and FIG. 1 is the main part? )
The parent diagram, Figure 2 is an external view, Figure 3 is an explanatory diagram of the guide pole, Figure 4 is a top view, Figure 5 is a side view, Figure 6 is an explanatory diagram during horizontal movement, and Figure 7 is an explanatory diagram of the guide pole. It is an explanatory diagram during a turn. (2)...disc, (4)...pick amplifier, (
5)...Drive motor, (9)...Pinion, (10
) (11)...Roller, (12)...Rack, (1
4)... Gaitley! Mutter (12a) (14a)...
Lower linear part, (12b) (14b) -... Connecting part, (
12c) (14C)... Upper straight part, (6)...
Movable base, (16) (17)...guide pole. Figure 4

Claims (1)

[Claims] (1) A single pickup for reproducing information from a disk on which information is recorded on both the front and back surfaces, and the pickup is integrally supported and can be selectively opposed to either side of the disk. A pickup transfer device comprising a movable base that moves and allows the pickup to play back any side of the disc, comprising: a gear portion pivotally supported on a first side of the movable base; a roller pivotally supported on a second side surface of the parallel movable base; a fitting hole formed in the bottom surface of the movable base in parallel to both side surfaces; and a roller mounted on the movable base and connected to the gear portion. a pair of first guide portions arranged parallel to the disk on both sides of the disk and with which the gear portion meshes when the movable base moves linearly; a pair of second guide parts arranged parallel to the disk and parallel to the first guide part, on which the rollers roll when the movable base moves in a straight line; and parallel to both the guide parts. A pair of guide poles are disposed on both surfaces of the disk and are fitted into the fitting holes to guide the linear movement of the movable base, and the guide poles are connected to the first guide portion and the second guide. A pickup transfer device, wherein the pickup transfer device is disposed closer to the first guide portion than an intermediate position of the first guide portion.