JPH0697544B2 - Pickup transfer device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Field of Industrial Application The present invention relates to a pickup transfer device used in an optical disc player for reproducing information from a disc.

(B) Conventional technology Conventionally, when reproducing information from a disc in a compact disc player or an optical video disc player, a pickup composed of a semiconductor laser and other optical members is used. It was regenerated by transferring it from the inner circumference to the outer circumference.

As means for moving the disc in the radial direction from the inner circumference to the outer circumference of the pickup, for example, as disclosed by the applicant in Japanese Patent Application No. 61-222600, the pickup is opposed to the disc. Similarly, a pinion driven by a drive motor also mounted on the support base is axially supported on both side surfaces of the support base, and a linear rack portion that meshes with the pinion is provided. The guide member is arranged on the chassis, and the support base is moved via the pinion and the rack portion in conjunction with the drive motor.
There is a method in which a guide shaft extending in the radial direction of the disc is attached to the chassis, and a fitting groove for fitting with the guide shaft is formed on the lower surface of the support base to provide accurate guide means of the support base in the radial direction of the disc. .

(C) Problems to be Solved by the Invention In the above-mentioned prior art, the pinion is an extremely general columnar gear having a gear portion formed on the outer periphery thereof. That is, the gear portion can rotate only in the direction orthogonal to the support shaft for pivotally supporting the pinion. Therefore, if the parallel state between the guide shaft and the rack cannot be maintained accurately, the fitting of the support base and the guide shaft is prioritized, the meshing state between the pinion and the rack becomes unstable, and smooth operation is impossible. Becomes

(D) Means for solving the problems: A disc on which information is recorded, a pickup for reproducing information from the disc, a support base for supporting the pickup, and a rack for guiding the radial movement of the support base disc. A guide member having a portion, a drive motor mounted on the support base, a rotary shaft portion rotatably fitted to a support shaft arranged on the side surface of the support base, and an outer peripheral gear portion meshing with the rack portion. Characterized by comprising a pinion driven by a motor, which is composed of a connecting portion that connects the rotating shaft portion and the outer peripheral gear portion and has flexibility so that the outer peripheral gear portion can be displaced with respect to the rotating shaft portion. And

(E) Operation Since the present invention is configured as described above, even when the outer peripheral gear portion is not exactly orthogonal to the support shaft that supports the pinion,
A stable meshing state between the rack portion and the outer peripheral gear portion is maintained.

(F) Example Hereinafter, one example of the present invention will be described with reference to the drawings.

FIG. 2 is a perspective view of an essential part of the apparatus of this embodiment, and (1) is a pickup including a semiconductor laser and other well-known optical members. This pickup (1) has a support base (2) for recording information on both sides of a disc (8
It is mounted and fixed so as to face 0). A drive motor (3) is mounted and fixed on the support base (2) as shown in FIG. 3, and a worm (4) is fixed on the shaft (3a) of the drive motor (3) to fix the support base (2). Left side plate (2a)
Meshes with a worm wheel (5) that is axially supported on the inner surface of, and the worm oil (5) meshes with a reduction gear (6a). The reduction gear (6a) is fixed to the left end of the shaft (7) integrally with the pulley (6b). A pulley (8) having the same shape as the pulley (6b) is fixed to the right end of the shaft (7), and the shaft (7) is provided on both side plates (2a) of the support base (2).
It is rotatably supported while penetrating (2b).

Pinions (9) and (10) of the same shape are symmetrically and rotatably supported by spindles (11) and (12) on the left and right side plates (2a) and (2b) of the support base (2). ing. Support shaft (11) (12)
Are located on the same axis. The pinion (9) (10) bears the support shafts (11) (12) as shown in FIGS. 4 (A) and (B), and the rotating shaft parts (13) (16) and the entire outer circumference have a toothed shape. An outer peripheral gear portion (14a) (17a) and an outer peripheral portion (14) (17) coaxially formed inside the outer peripheral gear portion (14a) and having belt hanging grooves (14b) (17b), , This peripheral part (14) (1
Flexible ribs (connecting parts) (15) (15) (15) with a substantially S-shaped cross section that connect the 7) and the rotating shaft parts (13) (16) at four places
(15), (18), (18), (18) and (18) are integrally formed of synthetic resin. By deforming the S-shaped ribs (15) (18), as shown in FIG. 5, the rotating shaft portions (13) (16)
From the line (H) orthogonal to the center line (M) of (1), only the outer peripheral portions (14) and (17) can be displaced by the angle (γ) while the rotation shaft portion is fixed.

(88) and (89) are pulley (6b) (8) and groove (14b) (1
The belts are wound around 7b), and the rollers (20) and (21) are fitted on the support shafts (11) and (12) from the outside of the pinions (9) and (10).

(22) is a roller supported only on the right side plate (2b), and is at the same height as the roller (21).

Reference numeral (23) is an ohmic guide hole formed on the bottom surface of the support base (2), and a guide pole arranged on the chassis is fitted into the guide hole as described later to guide the support base (2) in a straight line. .

Next, the guide means for guiding the support base (2) will be described in detail. As shown in FIGS. 3 and 6, the guide means is composed of left and right support blocks (46) (47) fixed on the chassis. In FIGS. 3 and 5, (37) and (38) are racks that mesh with the pinions (9) and (10), and the lower linear portion (39) (which extends horizontally on the lower chassis (69) ( Four
0) and the lower surface of the upper chassis (41) to the lower linear parts (39) (4
0), the upper linear portions (42) (43) and U-shaped connecting portions (44) (45) that connect the linear portions are integrally formed on the left / right support block (guide member). ) (46) (47)
Is disposed on the inner surface of the. A guide groove (48) into which the roller (20) is fitted together with the rack (37) is provided on the inner surface of the left support block (46), and rollers (21) (22) are similarly provided on the right support block (47). A guide groove (49) to be fitted is formed.

(50) (51) are cylindrical guide poles fixed to the lower and upper chassis, and are arranged parallel to the linear portions of the racks (37) (38) and the guide grooves (48) (49). There is. As shown in FIG. 7, the guide poles (50) (51) are screwed and fixed to the upper and lower chassis (41) (69) via cylindrical relay pieces (54) (55). Further, the guide hole (23) into which the guide poles (50) (51) are fitted is formed on the lower surface of the support base (2) as described above. The disc (80) placed on the disc tray (not shown)
Is placed and clamped on the turntable (60) between the upper and lower linear portions (42) (43) (39) (40).

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

In the STOP mode, the support base (2) is located at the standby position shown in FIG. 8 (P), that is, at the tip of the lower linear portions (39) (40), and is the back surface of the disc (80). It faces the innermost circumference of surface A.

In the PLAY mode, the feed motor (3) drives,
The driving force is worm (4), worm wheel (5),
Reduction gear (6a), pulley (6b) (8), belt (88)
It is transmitted to the pinions (14) and (17) which are in mesh with the racks (37) and (38) via (89), and is directed toward the position shown in (Q) of FIG. 8 toward the lower linear portion (39). ) (40) The linear movement of the support base (2) is started. At the same time, the spindle motor (90) starts rotating, and the pickup (1) reproduces the signal on the A surface of the disc (80). During this playback, the servo system tracking control circuit operates,
The tracking error signal obtained from this is supplied to the feed motor (3), and the pickup (1) from the A side is obtained.
Along with the signal extraction by (1), the support base (2) moves in the outer peripheral direction of the disk (80), that is, on the lower linear portions (39) (40) toward the connecting portions (44) (45).

During this linear movement, it is necessary to move the pickup (1) in the radial direction of the disc with extremely high accuracy.
A guide pole (50) is fitted in the guide hole (23) for the purpose of keeping the facing distance between the pickup (1) and the disk surface at a constant value. Therefore, the rack (37)
(38) That is, the extending direction of the lower linear portions (39) (40) and the extending direction of the guide pole (50) must be maintained in a parallel state with high accuracy, but left and right support Since there is an error in the accuracy of mounting the blocks (46) (47) and the guide pole (50) to the lower chassis, there is a limit to maintaining the parallelism between them. For example, as shown in FIG. 9, the lower straight part (46) with respect to the center line (m) of the guide pole (50).
(47) extends outwardly by an angle (α), or as shown in FIG. 10, the lower linear portions (46) (47) form an angle ( Even if it extends only inwardly by β), as long as it is in the range of α ≦ γ and β ≦ γ, the ribs (15) and (18) are deformed as shown in FIG. The pinions (9) and (10) are kept in mesh with the racks (37) and (38), and the deviation angles (α) and (β) are absorbed, and the pinions (9) and (10) move in the radial direction of the disc along the guide pole (50). It is possible to feed the support base (2), that is, the pickup (1).

When the support base (2) reaches the position (Q) in FIG. 8, the reproduction of the surface A is completed, and the feed motor (3) is supplied with a predetermined high potential voltage instead of the tracking error signal.
The support base (2) moves at high speed through the connecting portions (44) (45) to the tips of the upper linear portions (42) (43), and the innermost circumferential position of the surface B of the disc (80). At the same time, the spindle motor (90) rotates in the reverse direction, the signal is extracted by the pickup (1) as in the case of the A surface, and the support base (2) moves toward the outer circumference of the disc (80). .

Even when the support base (2) moves in the upper linear portions (42) (43), the guide pole (51) remains fitted in the guide hole (23) like the lower guide pole (50). Therefore, the height of the pickup (1) is restricted in the vertical direction and rattling in the vertical and horizontal directions is prevented to improve the tracking accuracy of the pickup. However, like the lower side, the guide pole (51) and the upper side Straight part (42) (43)
The parallelism with and is absorbed up to the allowable angle (γ) due to the deformation of the ribs (15) (18).

When the movement of the upper linear parts (42) (43) of the support base (2) is completed and the reproduction of the B side is completed, the spindle motor (90) is stopped and the support base (2) is connected to the connecting part (44). (Four
After 5), it moves to the position (P) in FIG. 8 which is the most distal end of the lower linear portions (39) (40) and stops there. Thus, double-sided reproduction is completed.

In the apparatus of this embodiment, when the support base (2) moves through the connecting portions (44) (45), the guide hole (23) is not fitted to the guide poles (50) (51). Therefore, the parallelism with the guide poles (50) (51) does not matter, but the ribs (15) (18) are used to correct the parallelism of the left and right support blocks (46) (47) themselves. Is deformed to help achieve a stable meshing between the pinions (9) (10) and the racks (37) (38). Further left and right support blocks (46) (4
Even when only one of 7) is not parallel to the guide poles (50) (51), the rib of the pinion meshing with the rack on the non-parallel side is deformed and a stable meshing state is maintained. Further, the same effect can be obtained in recording a signal on the disc by the pickup according to this embodiment.

Furthermore, as another embodiment, a flexible material such as rubber may be used as a sandwich structure between the rotary shaft portion and the outer peripheral portion in place of the rib of the device of this embodiment.

(G) Effect of the Invention As described above, according to the present invention, since the assembly error of the guide pole and the rack is absorbed by the pinion itself, the assembly workability can be improved and the pinion itself has a flexible structure. Therefore, external vibrations, noises and the like associated with meshing are reduced through the gears and the like.

[Brief description of drawings]

The drawings all relate to one embodiment of the present invention. FIG. 1 is an explanatory view including a partial cross section of a pinion meshing portion, FIG. 2 is a perspective view of a support base, FIG. 3 is an overall perspective view, and FIG. (A) (B)
Is a cross-sectional view and front view of the pinion, FIG. 5 is a view when the rib is deformed, FIG. 6 is an overall top view, FIG. 7 is a view showing the relationship between the guide pole and the support base, and FIG. 8 is a view of the support base. FIGS. 9 and 10 are explanatory diagrams for explaining the movement, and are explanatory diagrams when there is an error in the parallelism between the guide pole and the rack. (1) …… Pickup, (2) …… Support base,
(9) (10) …… Pinion, (14) (17) …… Outer periphery,
(14a) (17a) ... Outer peripheral gear part, (15) (18) ... Ribs (connecting parts), (37) (38) ... Rack, (46) (47) ...
… Left and right support blocks (guide members), (80) …… discs.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (56) References SHO 56-174156 (JP, U) ACT 57-42247 (JP, U) ACT 54-105349 (JP, U) ACT 55- 154843 (JP, U)

Claims (1)

[Claims] 1. A disc on which information is recorded, a pickup for reproducing information from the disc, a support base for supporting the pickup, and a rack portion for guiding movement of the support base in the radial direction of the disc. A guide member having, a drive motor mounted on the support base, a rotary shaft portion rotatably fitted to a support shaft arranged on a side surface of the support base, and an outer peripheral gear portion meshing with the rack portion. And a connecting portion that connects the rotating shaft portion and the outer peripheral gear portion and is flexible so that the outer peripheral gear portion can be displaced with respect to the rotating shaft portion, and is driven by the motor. A pickup transfer device comprising a pinion.