JP2001023320A - Disk recording and reproducing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To simplify attaching of a guide shaft for guiding travel of a pickup and a screw shaft of a travel driving device and to hold parallelism of both shafts. SOLUTION: A turn table 2 rotating a disk D, a pickup 3 which moves on a radial line toward the turn table and emits laser beams onto a signal surface of the disk D and the travel driving device 5 travel-driving the pickup are arranged on a same chassis 1. In a disk recording and reproducing device in which the pickup 3 travels by being guided by a pair of guide shafts 4, 40, a frame 7 of the travel driving device 5 and brackets 74, 74 supporting both ends of one guide shaft 4 are integrally molded and are attached to the chassis 1.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a disk recording / reproducing apparatus for reading a signal surface of a disk by a pickup driven and driven by a pair of guide shafts.

[0002]

2. Description of the Related Art FIG. 5 shows the vicinity of a pickup (3) of such a recording / reproducing apparatus. A turntable (2) is provided on the chassis (1) and can be picked up and away from the turntable (2) in a plane parallel to the chassis (1).
(3) is deployed, and the traveling drive device is installed on the turntable (2).
(5) is linked. Both ends of the pickup (3) are slidably fitted on a pair of guide shafts (4) and (40), and run on a radial line of a disk D mounted on the turntable (2).

[0003] Both ends of each guide shaft (4) (40) are mounted on a chassis.
It is supported via a height adjusting mechanism (6) on a bracket (60) fixed by screws to (1). The height adjustment mechanism (6)
A mechanism for correctly reading the reflected signal of the laser beam applied to the signal recording surface of the disk D from the pickup (3) by adjusting the inclination of the guide shafts (4) and (40), that is, the inclination of the pickup (3). It is.

The traveling drive unit (5) transmits the rotation of the motor (51) to a pinion gear (53) via a gear train (52), and transfers the rotation to a rack (54) formed on the end face of the pickup (3). The pickup (3) is configured to run along the guide shafts (4) and (40) by meshing with a pinion gear (53).

[0005]

The above-mentioned disk recording / reproducing apparatus comprises four brackets (60) (60) (60) (60) supporting both ends of the guide shafts (4) (40) and a traveling drive unit (5). ) Frame
(50) has a problem that it takes time and effort for assembling because it is separately fixed to the chassis (1) with screws. Also, the bracket (60) is a small part, and there is a problem that it is difficult to accurately position and mount the bracket (60) on the chassis (1).
The present invention simplifies assembly and improves the accuracy of the assembly position by integrally forming a frame of the traveling drive device and a bracket that supports a guide shaft on the traveling drive device side, and also enables the traveling drive device to use a screw. An object of the present invention is to clarify a disk recording / reproducing apparatus which can maintain the parallelism between a screw shaft and a guide shaft without being affected by an assembly error when a screw thrust of a shaft is used.

[0006]

A disk recording / reproducing apparatus according to the present invention comprises a turntable (2) for rotating a disk (D), a laser beam moving on a radial line with respect to the turntable (2), and Pickup firing (3)
And a traveling drive device for travelingly driving the pickup (3).
(5) is arranged on the same chassis (1), and the pickup (3) is a traveling drive device in a disk recording / reproducing apparatus traveling by being guided by a pair of guide shafts (4) and (40).
The frame (7) of (5) and brackets (74) (74) supporting both ends of one guide shaft (4) are integrally formed to form a chassis.
It is attached to (1).

[0007]

[Operation and Effect] Since the brackets (74) (74) supporting both ends of the guide shaft (4) are formed integrally with the frame (7) of the traveling drive unit (5), the frame (7) is mounted on the chassis. (1)
The brackets (74) and (74) at the same time
It is fixed to (1), and the chassis traveling drive device (5)
Frame (7) and guide shaft (4) support bracket (74)
The assembly can be simplified as compared with fixing the (74) separately to the chassis (1). Also, frame (7) and bracket (7
4) By integrally molding (74), the number of parts can be reduced, and by integrally forming one part,
It can be fixed to the chassis (1) with high positioning accuracy. As a result, the pickup (3) can be accurately moved along the radius line of the disk D to read the signal correctly.

In the case of using the screw thrust by the rotation of the screw shaft for the traveling drive device (5), the parallelism between the screw shaft and the guide shaft (4) greatly affects the smooth running of the pickup (3). Since the assembly error of the frame (7) does not appear in the error of the parallelism between the screw shaft support and the guide shaft support brackets (74), (74), the parallelism between the screw shaft and the guide shaft (4) is maintained. There is no problem to do so.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an example of the present invention will be described in detail with reference to the drawings. FIG. 1 is a plan view of an example of a disk recording / reproducing apparatus according to the present invention. A turntable (2) for rotating the disk D is provided on the chassis (1), and a pickup (3) for emitting a laser beam is provided on the signal surface of the disk D so as to be able to approach and separate from the turntable (2).

The pickup (3) has a chassis at both ends.
(1) It is slidably fitted on the upper parallel guide shaft (4) (40). As is well known, the disk D rotates, and the pickup (3) moves on the radius line of the disk D, and the disk D
Can be recorded or reproduced.

A travel driving device (5) for the pickup (3) is provided near one guide shaft (4). The traveling drive device (5) transmits the rotation of the motor (51) to the screw shaft (56) via the gear train (52), and picks up the screw (3) by the screw thrust generated by the rotation of the screw shaft (56). To drive the vehicle.

The frame (7) of the traveling drive unit (5) is formed by injection molding of a synthetic resin, and supports the support parts (72) (72) at both ends of the connecting rod (71) at right angles to the connecting rod (71). Provided, the support portion (72)
The through-holes (73) (73) into which the end of the screw shaft (56) is rotatably fitted
Has been established. The frame (7) is fixed to the chassis (1) by a plurality of screws (55).

Brackets (74) and (74) are formed integrally with each of the support portions (72) and (72) when the frame (7) is formed, and each bracket (74) has an inner surface and an upper surface facing each other. Notches (75) and (76) are opened, and one notch (75) is deep and the other notch (76) is shallow. The opening width of the notches (75) and (76) is large enough to fit the guide shaft (4) without rattling.

Also, the through holes (73) (73) of the support portions (72) (72)
When the both ends of the screw shaft (56) are fitted into the notches (75) and (76) and the both ends of the guide shaft (4) are fitted,
(56) so that the guide shaft (40) is kept parallel to the through hole (7
3) (73) and notches (75), (76) have high positional accuracy. This depends on the processing accuracy of the mold for injection-molding the frame 7, and it is not necessary to pay attention to the parallelism between the screw shaft 56 and the guide shaft 4 during assembly.

The one guide shaft is provided in the shallow notch (76).
The end of (4) is fitted, the pressing spring plate (78) is covered, and the pressing spring plate (78) is fixed to the bracket (74) with screws (78a). The end of the guide shaft (4) fitted in the shallow notch (76) cannot be adjusted in height, and maintains the reference height.

A compression spring (79) is fitted into the deep notch (75), and the end of the guide shaft (4) is cut from above the spring (79).
(75), and the plate (77) is covered. Plate (7
7) is fixed to the bracket (74) with a screw (77a), and a pushing screw (77b) screwed through the plate (77) is used as a guide shaft (4).
Press the end of. The inclination of the guide shaft (4) with respect to the chassis (1) can be adjusted by tightening or loosening the push screw (77b).

As shown in FIGS. 1 and 4, the other guide shaft (4
Both ends of (0) are separately supported by brackets (42) (42) fixed to the chassis (1) by screws. Both brackets (4
2) (42) is provided with a notch (43) having an open inner and upper surface facing each other, and the notch (43) has a compression spring (7).
9) is fitted, the end of the guide shaft (40) is fitted into the notch (43) from above the spring (79), and the plate (77) is covered.

The plate (77) is bracketed with screws (77a)
A push screw (77b) fixed to (42) and threaded through the plate (77) pushes the end of the guide shaft (40). Push screw (77
By tightening or loosening b), the height and inclination of the guide shaft (40) with respect to the chassis (1) can be adjusted.

A spring plate (31) is projected from an end of the pickup (3) on the screw shaft (56) side, and a projection (32) formed on the lower surface of the spring plate (31) is provided with a ridge (32). It is fitted in the spiral groove of the screw shaft (56) of (5). The pickup (3) is driven by the guide shafts (4) and (40) by the screw thrust generated by the rotation of the screw shaft (56).
Approaching or leaving the turntable (2) along.

However, the guide shaft on the traveling drive unit (5) side
Since the brackets (74) and (74) supporting both ends of (4) are formed integrally with the frame (7) of the traveling drive device (5),
When the frame (7) is fixed to the chassis (1), the brackets (74) and (74) are also fixed to the chassis (1) at the same time, and the frame (7) and the bracket (74) ) (74) can be simplified in comparison with fixing the (74) separately to the chassis (1).

Further, by integrally molding the frame 7 and the brackets 74, 74, the number of parts can be reduced.
Also, the frame (7) can be formed large by integrally molding the frame (7) and the brackets (74), (74).
A positioning hole and a positioning projection are provided on the chassis (7) and the chassis (1) to be engaged with each other.
(7) can be fixed with increased positioning accuracy. As a result, the pickup (3) can be accurately moved along the radius line of the disk D to read the signal correctly.

The parallelism between the screw shaft (56) of the traveling drive unit (5) and the guide shaft (4) of the pickup (3) is equal to that of the pickup (3).
Affects the smooth running of the vehicle, but the assembly error of the frame (7)
The support (72) of the screw shaft (56) and the bracket (7) of the guide shaft (4)
4) Since it does not appear in the parallelism error of (74), the problem of the parallelism between the screw shaft (56) and the guide shaft (4) does not occur.

In implementing the present invention, a traveling drive device
The structure (5) is not limited to the one using the screw thrust by the rotation of the screw shaft (56), and the structure such as a mechanism using a rack and a pinion as shown in the conventional example of FIG. Absent. Furthermore, the present invention is not limited to the configuration of the above embodiment, and various modifications are possible within the scope described in the claims.

[Brief description of the drawings]

FIG. 1 is a plan view of a disk recording / reproducing apparatus.

FIG. 2 is a perspective view showing a state where a guide shaft and a screw shaft are removed from a frame.

FIG. 3 is a sectional view taken along the line AA of FIG. 1;

FIG. 4 is a sectional view taken along the line BB in FIG. 1;

FIG. 5 is a perspective view of a conventional example.

[Description of Signs] (1) Chassis (2) Turntable (3) Pickup (4) Guide Shaft (40) Guide Shaft (5) Traveling Drive (56) Screw Shaft (7) Frame (72) Support (74 ) Bracket

Claims (2)

[Claims] 1. A turntable for rotating a disk D
(2), a pickup (3) that moves on a radius line with respect to the turntable (2) and emits a laser beam to a signal surface of the disk D, and a traveling drive device (5) that drives the pickup (3) to travel. ) Are arranged on the same chassis (1), and the pickup (3) is a disk recording / reproducing apparatus that travels guided by a pair of guide shafts (4) (40). A disk recording / reproducing apparatus in which a frame (7) and brackets (74) (74) supporting both ends of one guide shaft (4) are formed integrally and attached to a chassis (1). The traveling drive device (5) rotationally drives a screw shaft (56) provided in parallel with the guide shaft (4), and picks up by a screw thrust generated by rotation of the screw shaft (56). 2. The disk recording / reproducing apparatus according to claim 1, wherein said apparatus drives a disk.