JPH0664873B2 - Optical disk device - Google Patents

Description

The present invention relates to an optical disc apparatus in which an optical pickup is supported by a guide shaft and is slidable in the radial direction of a disc on a turntable, and more particularly, The present invention relates to an optical disc device in which a method of supporting a guide shaft is improved.

(B) Related Art There is known an optical disk device that reads a signal from a disk or writes a signal to the disk by using a light beam emitted from an optical pickup. In most of the optical disc devices, two guide shafts parallel to each other are arranged in the radial direction of the disc on the turntable, and the guide shaft supports the optical pickup slidably in the radial direction of the disc. However, it is difficult to make the surface formed by the guide shaft, that is, the sliding surface on which the optical pickup slides, parallel to the disk mounting surface of the turntable. Therefore, in the optical disc device, in order to prevent coma from occurring in the optical spot on the disc, as shown in, for example, Japanese Patent Laid-Open No. 62-86548, one guide shaft is used as an axis for guiding the other guide of the optical pickup. The shaft side can be moved up and down, and the posture of the optical pickup is adjusted so that the optical axis of the optical pickup is perpendicular to the disk mounting surface of the turntable.

(C) Problems to be Solved by the Invention However, the above-mentioned optical disk device requires a mechanism for adjusting the attitude of the optical pickup, increases the number of parts, and requires adjustment work, which causes a problem in workability. there were.

On the other hand, as an optical disk device, for example, Japanese Patent Laid-Open No. 63-1242
As shown in Japanese Patent Publication No. 80, by adjusting the height of the guide shaft, the sliding surface on which the optical pickup is slid is made parallel to the disk mounting surface of the turntable, and the optical spot on the disk has coma aberration. It is publicly known that it is prevented from being generated.

However, even such an optical disk device has a drawback in that the work of adjusting the height of the guide shaft is required and the workability is poor.

(D) Means for Solving the Problems The present invention has been made in view of the above-described points, and includes a first chassis integrally formed with a mounting portion on which a guide shaft is mounted, and a turntable. A second chassis which is attached to the first chassis and is attached to the first chassis, and when the second chassis is attached to the first chassis, the guide shaft is brought into contact with and supported by the second chassis. Is positioned on the surface of the second chassis to be supported by the mounting portion.

(E) Operation In the present invention, a guide shaft chassis on which a guide shaft that slidably supports an optical pickup is placed and a turntable chassis to which a turntable is attached are separately provided, and the turntable is provided. The table chassis is fixed to the guide shaft chassis, and at that time, the guide shaft is abutted and supported by the turntable chassis so that the guide shaft is positioned by the surface of the turntable chassis. It is intended to obtain sufficient parallelism between the surface formed by the guide shaft and the disk mounting surface of the turntable.

(F) Embodiment FIG. 1 is an exploded perspective view showing an embodiment of the present invention.
Is an optical pickup, (2) and (3) are arranged parallel to each other, and is a guide shaft for slidably supporting the optical pickup (1), and ( 4 ) is a synthetic resin molded first chassis. , (5) to (8) are the first chassis ( 4 )
And has a substantially V-shaped recess,
A projecting piece serving as a mounting portion on which the guide shaft (2) or (3) is mounted, ( 9 ) is a second chassis formed by sheet metal working of a metal plate, and (10) is the second chassis ( 9 ). ) Is a spindle motor screwed and fixed, and (11) is a turntable fixed to the shaft (10a) of the spindle motor (10).

When assembling, first, the guide shafts (2) and (3) are inserted into the optical pickup (1), and both ends of one of the guide shafts (2) are protruded pieces (5) and (6), respectively. Of the guide shaft (3), and both ends of the other guide shaft (3) are placed in the recesses of the projecting pieces (7) and (8). In this state, the guide shaft (2)
And (3) are parallel to each other, the first chassis ( 4 )
Placed on. Also, the guide shafts (2) and (3) are not completely buried in the recesses of the projecting pieces (5) and (6) or the projecting pieces (7) and (8), and thus the guide shafts (2) and ( The upper end of 3) is slightly higher than the upper end of the first chassis ( 4 ), the upper surface and the protruding pieces (5) to (8).

Then, the screw holes of the first and second chassis ( 4 ) and ( 9 ) are aligned, and the second chassis ( 9 ) is attached to the first chassis ( 4 ) with screws (12a) to (12c). If so, the assembly is completed.

By the way, when the second chassis ( 9 ) is attached to the first chassis ( 4 ), the lower surface of the second chassis ( 9 ) contacts the guide shafts (2) and (3). Therefore, the screw (12
When a) to (12c) are screwed together, the guide shafts (2) and (3) are pressed by the second chassis ( 9 ).
Here, since the protrusions (5) to (8) are integrally molded with the first chassis ( 4 ) made of synthetic resin, when the guide shafts (2) and (3) are pressed, The protrusions (5) to (8) bend. Therefore, screws (12a) to (1
When 2c) is screwed, the guide shafts (2) and (3) are also displaced according to the displacement of the second chassis ( 9 ).
The lower surface of the second chassis ( 9 ) is formed with the screw holes of the first chassis ( 4 ) respectively.
To (13c) and screwing of the screws (12a) to (12c) is completed, the mounting of the second chassis ( 9 ) to the first chassis ( 4 ) is completed. As shown in FIG. 2 showing an enlarged cross-sectional view of a portion surrounded by a broken line in FIG. 1, one end of the guide shaft (2) is sandwiched between the projecting piece (5) and the second chassis ( 9 ). And the second
As shown in the figure, the concave portion of the projecting piece (5) has a shape in which one of the inner walls is vertical and the other of the inner walls is inclined. Therefore, by bending the protrusion (5), a biasing force in the direction of arrow A that is perpendicular to the inclined inner wall is generated at one end of the guide shaft (2), and the guide shaft (2) One end is pressed against the lower surface of the second chassis ( 9 ) and the vertical inner wall of the recess of the projecting piece (5).

By the way, not only the one end portion of the guide shaft (2) described above, but also the other end portion of the guide shaft (2) and the one end portion and the other end portion of the other guide shaft (3) of the guide shaft (2), respectively. It is designed to be supported similarly to the one end portion. Therefore, not only one end of the guide shaft (2) but also the other end is similarly pressed against the lower surface of the second chassis ( 9 ) and the vertical inner wall of the recess of the protruding piece (6), and the other guide shaft (3 In the same manner, one end is perpendicular to the lower surface of the second chassis ( 9 ) and the vertical inner wall of the recess of the protrusion (7), and the other end is vertical to the lower surface of the second chassis ( 9 ) and the recess of the protrusion (8). It is pressed against each inner wall.

Therefore, the height directions of the guide shafts (2) and (3) are positioned by the lower surface of the second chassis ( 9 ),
The lateral direction of the one guide shaft (2) is defined by the vertical inner walls of the recesses of the protrusions (5) and (6), and the lateral direction of the other guide shaft (3) is defined by the protrusions (7) and Positioned by the vertical inner walls of the respective recesses in (8).

Therefore, by setting the position where the lower surface of the second chassis ( 9 ) is arranged and the position of the vertical inner wall of each concave portion of the protruding pieces (5) to (8), the guide shafts (2) and (3) are set. Can be arranged as set.

By the way, since the second chassis ( 9 ) is a simple-shaped metal plate having no irregularities, it is possible to easily achieve high plane accuracy. Therefore, the accuracy in the height direction of the guide shafts (2) and (3) can be easily obtained.

On the other hand, the second chassis ( 9 ) has a turntable (11).
The spindle motor (10) to which is attached is fixed. Therefore, the positional relationship between the turntable (11) and the guide shafts (2) and (3) can be made constant, and the disc mounting surface (11) of the turntable (11) can be fixed.
It is easy to make a) parallel to the plane formed by the guide shafts (2) and (3).

Therefore, it is possible to prevent coma from occurring in the light spot on the disc (not shown) of the light beam emitted from the optical pickup (1).

Incidentally, there although in the foregoing embodiments, although the second chassis (9) constituted by a metal plate, the second chassis (9) may be Dasere planar accuracy to some degree as, a material which is planar accuracy put out in, for example, synthetic resin It can be used for the second chassis ( 9 ) without any problem.

Further, of the screws (12a) to (12c) used for attaching the second chassis ( 9 ) to the first chassis ( 4 ), the screws (12b) and (12c) are attached to washers (14a) and (14b), respectively. ), But this is due to contraction due to temperature change between the first chassis ( 4 ) and the second chassis ( 9 ).
This is to absorb the dimensional change due to expansion.

(G) Effect of the Invention As described above, according to the present invention, the second chassis to which the turntable is mounted is mounted to the first chassis on which the guide shaft is mounted, and the surface of the second chassis is mounted. Since the guide shaft is positioned by means of the above, the positional relationship between the guide shaft and the turntable is determined, and the parallelism between the plane formed by the guide shaft and the disk mounting surface of the turntable is easily determined. It is possible to prevent the occurrence of the light spot coma aberration on the disc of the light beam emitted from the optical pickup.

[Brief description of drawings]

FIG. 1 is a developed perspective view showing an embodiment of the present invention, and FIG. 2 is a partial sectional view used for explaining the present invention. Description of main drawing numbers (1) …… Optical pickup, (2) (3) …… Guide shaft, ( 4 ) …… First chassis, (5) (6) (7)
(8) …… Protrusion, ( 9 ) …… Second chassis, (11) ……
Turntable.

Claims (1)

[Claims] 1. An optical pickup for optically reading or writing a signal is supported by a guide shaft,
In an optical disk device provided so as to be slidable in the radial direction of a disk on a turntable, a first chassis integrally formed with a mounting portion on which the guide shaft is mounted, and the turntable are mounted. A second chassis attached to the first chassis, wherein the guide shaft is brought into contact with and supported by the second chassis when the second chassis is attached to the first chassis. (2) An optical disk device characterized in that it is positioned on the surface of the chassis and supported by the mounting part.