JPH04255917A - Optical disk device - Google Patents

Abstract

PURPOSE:To facilitate the adjustment of an optical system and to simplify the assembly work of the whole device and also to make the optical system superior in maintenance. CONSTITUTION:An optical head movable part 10 is mounted with an objective lens 11 and a mirror 12, and is fitted with a bearing mechanism 14. The optical head movable part 10 is guided freely movably in the direction of A by a guide rail 15. The surface of a disk medium 31 is irradiated with a laser beam emitted from an optical head fixing part 20 via the mirror 12 and the objective lens 11. Then, the guide rail 15 and the optical head fixing part 20 are fitted to a subbase 25 which is independent of a main base.

Description

[Detailed description of the invention]

0001

[Field of Industrial Application] The present invention relates to an optical disc device.
In particular, the present invention relates to an optical disc device having an optical head movable section and an optical head fixed section.

0002

[Prior Art] In order to speed up the access of an optical disk device, most of the parts that make up the optical head are mounted on a fixed part, and only the objective lens and mirror of the parts that make up the optical head are movable. An optical disc device has been proposed that is mounted on the main body of the optical disk drive unit to reduce the weight of the movable part. Conventional devices of this type have a structure in which the optical head fixing section is attached to a main base to which the guide mechanism and other components for movably guiding the optical head movable section relative to the disk surface are fixed. ing.

0003

However, in the above-mentioned conventional optical disk device, it is difficult to adjust the optical axis so that the optical axis of the laser beam emitted from the optical head fixed part and the moving direction of the optical head movable part are precisely aligned in microns. The adjustment of the optical system, including the parts, has to be done on the main base, and as a result, it is impossible to separate the assembly process from other parts assemblies, which greatly impedes productivity and increases costs. Since it cannot be handled as an independent component as a whole, it is also a major obstacle in terms of maintainability. The present invention has been made in view of the above points,
The purpose is to provide an optical disc device in which the optical system can be easily adjusted, the assembly work of the entire device is simplified, and the optical system is easy to maintain.

0004

[Means for Solving the Problems] In order to achieve this object, an optical disc device according to the present invention includes a disc medium,
an optical head movable section that irradiates light onto the optical disk medium to read and write information; a guide mechanism that guides the optical head movable section movably along the surface of the disk medium; and an optical head movable section that The guide mechanism and the optical head fixing part are independently fixed to the same base.

[0005]

[Operation] In the optical disc device according to the present invention, the guide mechanism for guiding the optical head movable section and the optical head fixing section are independently fixed to the same base,
Adjustment of the optical system is performed independently from other assemblies. Furthermore, maintenance of the optical system will be performed independently.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be explained in detail below with reference to the drawings. FIG. 1 is a plan view of a main part of a disk device according to the present invention, and FIG. 2 is a side view of the same. In these figures, 1 is the main base of the device. Reference numeral 10 denotes an optical head movable section, on which an objective lens 11, a mirror 12, and a drive coil 13 are mounted, and a bearing mechanism 14 is attached to the lower end. 15 is a guide rail, the bearing mechanism 14 is guided by this guide rail 15, and the optical head movable part 10 is
It is supported so that it can move freely in the direction. Reference numeral 17 denotes a magnetic circuit disposed on the main base 1, and the drive coil 13 is inserted inside this magnetic circuit 17. Reference numeral 20 denotes an optical head fixing section that emits a laser beam to the optically movable head 15 along the guide rail 15. The optically movable head 20 and the guide rail 15 are connected to a sub-base 25 that is independent of the main base 1.
is attached to. 30 is a spindle motor, which is mounted on the main base 1 so that its rotation axis is parallel to the optical axis of the objective lens 11, which is perpendicular to the longitudinal direction of the guide rail 15.
is fixed. A disk medium 31 is attached to the motor 30 from the outside, and is disposed near the objective lens 11 that moves with the movement of the optical head movable section 10.
It is rotated by a motor 30.

The operation will be explained below. By applying a current to the drive coil 13, the optical head movable section 10 moves in the A direction due to the electromagnetic force generated by the interaction between the drive coil 13 and the magnetic circuit 17. Optical head fixing part 20
The laser beam emitted along the guide rail 15 is reflected by the mirror 12 of the optical head movable section 10, is focused by the objective lens 11, and reaches the surface of the rotating disk 31, where it is directed to an arbitrary position on the disk 31. reading information to,
Writing is performed. In this embodiment, since the magnetic circuit is attached to the main base, the sub-base is relatively small and lightweight, easy to handle, and the optical axis is less likely to be misaligned.

Note that in this embodiment, the optical head movable section 10
Spindle motors 30 are installed at both ends of the movable range of the
Although the optical head fixing section 20 and the optical head fixing section 20 are disposed, the present invention is not limited to this, and it goes without saying that they may be disposed on the same side. Further, the bearing mechanism 14 is not limited to bearing support, and it goes without saying that a sliding sleeve or other method may be adopted. Furthermore, by providing a position adjustment structure at the attachment part of the sub-base 25 to the main base 1,
The position and posture of the optical system and the disk medium 31 can be easily adjusted without damaging the adjusted state inside the optical system.

[0009]

As described in detail above, according to the optical disc device of the present invention, the optical head fixing portion, including the guide mechanism for moving the optical head movable portion, is mounted on the sub-base independent of the main base. It is constructed to allow optical adjustments to be made on a sub-base basis independently from the main base, and also allows for replacement on a sub-base basis. As a result, it is possible to separate the optical system assembly, which accounts for a large portion of the optical disc device assembly, from other assemblies, greatly improving productivity compared to the conventional method.
This in turn leads to cost reduction. Furthermore, since it becomes possible to replace each subbase, maintainability can be greatly improved.

[Brief explanation of the drawing]

FIG. 1 is a plan view of essential parts of an optical disc device according to the present invention.

FIG. 2 is a side view of essential parts of the optical disc device according to the present invention.

[Explanation of symbols]

1 Main base 10 Optical head movable part 15 Guide rail 20 Optical head fixing part 25 Sub bass 30 Spindle motor 31 Disc media

Claims (1)

[Claims] 1. A disk medium, an optical head movable section that reads and writes information by irradiating the disk medium with light, and a movable optical head section that guides the optical head movable section along the surface of the disk medium. An optical disc device comprising a guide mechanism and an optical head fixing section that emits light to the optical head movable section, wherein the guide mechanism and the optical head fixing section are independently fixed to the same base. Device.