JP2536662Y2 - Optical disk drive - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical disc apparatus in which a guide shaft for supporting an optical pickup so as to be displaceable in a radial direction of a disc on a turntable is devised.

[0002]

2. Description of the Related Art In an optical disk apparatus, an optical pickup is often supported by two guide shafts disposed on a turntable in a radial direction of the disk so as to be displaceable in a radial direction of the disk. In such an optical disk device, the surface formed by two guide shafts, that is, the moving surface on which the optical pickup is displaced and the disk mounting surface of the turntable are made parallel,
It is important to prevent coma from occurring in the light spot on the disk of the light beam emitted from the optical pickup.

[0003] Therefore, the applicant of the present application first separates a chassis for a guide shaft on which a guide shaft for slidably supporting an optical pickup is mounted, and a chassis for a turntable to which a turntable is mounted separately. At the same time, the turntable chassis is fixed to the guide shaft chassis, and at this time, the guide shaft is abutted and supported by the turntable chassis so that the guide shaft is held by the surface of the turntable chassis. There has been proposed an optical disk device which is positioned and easily obtains a sufficient degree of parallelism between a surface formed by the guide shaft and a disk mounting surface of the turntable.

[0004]

In the optical disk device proposed by the applicant of the present invention, a shaft receiving portion for supporting a guide shaft is projected from a guide shaft chassis, and one end of the shaft receiving portion is made free. ing. The shaft receiving portion is formed of a synthetic resin material integrally with the guide shaft chassis in order to give the shaft receiving portion a spring property. For this reason, there is a fear that the shaft receiving portion may be depressed or the support position of the guide shaft may be displaced due to thermal deformation of the synthetic resin material.

[0005]

SUMMARY OF THE INVENTION The present invention is directed to an optical disk apparatus in view of the above-mentioned points, and comprises a synthetic resin main chassis having a through hole in which an optical pickup is disposed, and a peripheral edge of the through hole of the main chassis. While being projected from the inner wall,
A bent shaft having a concave portion for supporting the guide shaft formed therein, a flexible shaft receiving portion, a protrusion protruding upward from the shaft receiving portion, and a turntable are attached. A sub-chassis attached to a chassis for closing above the concave portion of the shaft receiving portion; and an insertion hole provided in the sub-chassis for inserting the protrusion, wherein the concave portion of the shaft receiving portion is And the guide shaft is abutted and supported by the side wall of the concave portion and the lower surface of the sub-chassis, and the protrusion is brought into contact with the edge of the insertion hole, whereby the shaft receiving portion is Deformation is regulated.

[0006]

According to the present invention, when the sub-chassis on which the turntable is mounted is mounted on the main chassis, the sub-chassis presses the guide shaft and is provided on the main chassis to support the guide shaft. When the guide shaft is pressed by the sub-chassis with the shaft receiving portion provided with a spring property, the resilient force is generated from the shaft receiving portion, and the component surface of the guide shaft is positioned by the surface of the sub-chassis. In order to restrict the deformation of the shaft receiving portion, a projection is projected from the shaft receiving portion, and an insertion hole into which the projection is inserted is provided in the sub-chassis. It is not to be lost.

[0007]

FIG. 1 is an exploded perspective view showing an embodiment of the present invention. In the figure, 1 is an optical pickup, 2 and 3
Are arranged in parallel with each other, a guide shaft for slidably supporting the optical pickup 1, 4 is a main chassis of a synthetic resin molded product having a through hole 5 in which the optical pickup 1 is arranged, and 6 to 9 are A bent shaft receiving portion formed with a concave portion for supporting the guide shaft 2 or 3 is integrally protruded from a peripheral inner wall of the through hole 5 of the main chassis 4 and has flexibility. And the recess has a shape that narrows in depth.

Reference numerals 10 and 11 denote protrusions projecting upward from free ends of the shaft receiving portions 7 and 8 which are not connected to the main chassis 4, and 12 denotes a flat plate sub-chassis formed by sheet metal processing of a metal plate. In addition, a through hole 13 is formed in a sliding range portion of the optical pickup 1, and insertion holes 14 and 15 into which the protrusions 10 and 11 are inserted are formed.

Reference numeral 16 denotes a spindle motor fixed to the sub-chassis 12 by screws, and reference numeral 17 denotes a turntable fixed to a rotating shaft of the spindle motor 16.

When assembling the optical disk apparatus constructed as described above, first, the guide shafts 2 and 3 are inserted through the optical pickup 1, and both ends of one of the guide shafts 2 are inserted into the shaft receiving portions 6 and 7, respectively. And the other end portions of the other guide shaft 3 are placed in the concave portions of the shaft receiving portions 8 and 9, respectively. In this state, the guide shafts 2 and 3 are arranged parallel to each other.

After that, one side of the sub-chassis 12 is inserted below the projecting pieces 18a and 18b protruding from the upper part of the thickness of the stepped portion 4a provided on the main chassis 4, and the projecting pieces 18a and 18b are inserted. With this, one side of the sub-chassis 12 is locked. And sub-chassis 1
2 screw holes 19a and 19b are aligned with the screw holes 20a and 20b of the main chassis 4, respectively.
When the sub-chassis 12 is attached to the main chassis 4 by a and 21b, the assembly is completed. In this case, one side of the sub-chassis 12 is positioned by the step portion 4a of the main chassis 4, so that the screw holes 19 are formed.
a and 19b can be aligned with the screw holes 20a and 20b, respectively, and the screws can be easily fixed.

By the way, when the guide shafts 2 and 3 are placed in the recesses of the shaft receiving portions 6, 7 and 8, 9 respectively, the guide shafts 2 and 3 are located in a circle within a two-dot chain line circle in FIG. As shown in FIG.
It is not completely buried in the concave portions of the shaft receiving portions 6 and 7 or the concave portions of the shaft receiving portions 8 and 9, but is supported by the inclined surfaces of the side walls of the respective concave portions. For this reason, the upper portions of the guide shafts 2 and 3 are disposed slightly higher than the upper surface of the main chassis 4, and the lower surface of the sub chassis 12 is positioned above the guide shafts 2 and 3 when the sub chassis 12 is mounted on the main chassis 4. Abut

The shaft receiving portions 6 to 9 have a spring property because of their shape and made of synthetic resin. When the guide shafts 2 and 3 are pressed from above, the shaft receiving portions 6 to 9 have a spring property.
The guide shafts 2 and 3 are urged upward by the repulsive force generated by the flexures 9 to 9. Therefore, when the sub-chassis 12 is attached to the main chassis 4, the guide shafts 2 and 3 are pressed against the lower surface of the sub-chassis 12, and the height direction of the guide shafts 2 and 3 is Positioned by the lower surface.

Here, the sub-chassis 12 is a flat metal plate and can easily provide high plane accuracy, so that the accuracy of the guide shafts 2 and 3 in the height direction can be easily increased.

A spindle motor 16 to which a turntable 17 is attached is fixed to the sub-chassis 12. Therefore, the accuracy of the positional relationship between the turntable 17 and the guide shafts 2 and 3 can be easily obtained,
The disk mounting surface of the turntable 17 and the surface formed by the guide shafts 2 and 3 can be easily made parallel.

When the sub-chassis 12 is mounted on the main chassis 4, the projections 10 and 11 provided on the shaft receiving portions 7 and 8 are inserted into insertion holes 14 and 15 provided on the sub-chassis 12, respectively. Is done. The guide shafts 2 and 3 are pressed by the lower surface of the sub-chassis 12 so that the shaft receiving portion 7 is pressed.
2 and 8 are bent to some extent, as shown in FIG.
And 15 are in contact with the peripheral inner wall, and the shaft receiving portion 7
And 8 further deflection. Therefore, all the shaft receiving portions 6 to 9 can be prevented from being pressed and damaged more than necessary, and besides, the guide shafts 2 and 3 can be connected to the shaft receiving portions 7 and 8 by thermal deformation of the shaft receiving portions 7 and 8. 8 can be prevented from obtaining an appropriate repulsive force.

[0017]

As described above, according to the present invention, the guide shaft is pressed against the lower surface of the sub-chassis on which the turntable is mounted by the flexibility of the shaft receiving portion. The accuracy of the parallelism between the plane to be mounted and the disk mounting surface of the turntable can be easily ensured, and the protrusion protruding from the shaft receiving portion is inserted into the insertion hole provided in the sub-chassis to achieve Since the deformation of the shaft receiving portion is regulated, it is possible to prevent the support position of the guide shaft from being displaced by the thermal deformation of the shaft receiving portion.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view showing one embodiment of the present invention.

FIG. 2 is a partial sectional view showing a main part of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Optical pickup 2, 3 Guide shaft 4 Main chassis 6, 7, 8, 9 Shaft receiving part 10, 11 Projection part 12 Sub-chassis 14, 15 Insertion hole

Claims (1)

(57) [Scope of request for utility model registration] An optical pickup for optically reading or writing a signal is supported by a guide shaft and is displaceable in a radial direction of a disk on a turntable. A main chassis made of a synthetic resin having a through hole to be disposed, and a bent shape which is projected from an inner wall of a periphery of the through hole of the main chassis and has a concave portion for supporting the guide shaft, and is flexible. A shaft receiving portion having a property, a protrusion protruding upward from the shaft receiving portion,
A sub-chassis, to which a turntable is attached, is attached to the main chassis, and closes the upper part of the concave portion of the shaft receiving portion, and an insertion hole provided in the sub-chassis to insert the protrusion. The concave portion of the shaft receiving portion is configured to be narrower in depth, the guide shaft is supported by the side wall of the concave portion and the lower surface of the sub-chassis, and the protrusion is brought into contact with the edge of the insertion hole. An optical disc device wherein the deformation of the shaft receiving portion is regulated by contacting the shaft receiving portion.