JPH1196586A - Optical disk device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable the quick access of the optical head of an optical disk device and also to realize the simplified and minuaturized device. SOLUTION: Relating to the optical disk device provided with an optical disk 1 to be rotatably driven and an optical head 3 irradiating a light at arbitrary positions in the radial direction with respect to the recording surface of the optical disk 1, the optical head 3 is constituted of a light source part 4 emitting a light to be radiated on the optical disk 1, the light deflecting part 5 provided with a rotary mirror 11 whose rotation angular position is constituted so as to be changable and which reflects the light to be emitted from the light source 4 toward different positions in the radial direction of disk 1 according to its rotation angular position and a fixed mirror 6 which is prologingly provided in the radial direction along the recording surface of the disk 1 and which reflects the light from the rotary mirror 11 toward the disk 1. An access to the optical disk is realized by only controlling the rotation angular position of the rotary mirror 11.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical disk device for recording and reproducing data on and from an optical disk, and more particularly to an optical head for accessing an optical disk.

[0002]

2. Description of the Related Art In an optical disk apparatus for recording and reproducing data by using light such as a phase change optical disk and a magneto-optical disk, light is irradiated while radially displacing a rotationally driven optical disk. Of optical heads.
For this reason, the conventional optical head has been configured to reciprocate entirely in the radial direction with respect to the optical disk. However, with the recent increase in access speed for recording and reproduction, the optical head has been downsized. , Weight reduction is achieved. For example, JP-A-64-35735 discloses that an optical head is separated into a fixed optical system and a movable optical system, and both optical systems are optically connected while only the movable optical system is moved in the radial direction of the optical disk. By doing so, miniaturization of the system in which the optical head is moved,
It is lightweight and enables high-speed access. Also,
In Japanese Patent Application Laid-Open No. Sho 62-47826, an optical head is configured as an optical arm, and the optical arm is driven to rotate with respect to an optical disk to enable high-speed operation.

[0003]

Although such an improved optical head of the prior art is effective for improving the access speed, it still requires an objective lens and a mirror as a part of the optical system in the radial direction of the optical disk. Therefore, there is a limit in reducing the mass of the part to be moved, and there is a limit in increasing the access speed. Regarding such a problem, Japanese Patent Application Laid-Open Nos. Hei 6-150316 and Hei 3-168931 propose an optical head that scans light on a recording medium by rotating a mirror. This technology is effective only when a tape-shaped recording medium is wound around the peripheral surface of a cylindrical head and optical scanning is performed at the center position of the head toward the peripheral surface of the head. It cannot be applied to optical heads. In addition, it cannot be denied that the overall configuration of the optical head, including the optical head for an optical disk and the optical head for a tape-shaped recording medium, is complicated and the number of parts is large, so that the cost and size of the apparatus can be reduced. Obstacles.

It is an object of the present invention to provide an optical disk apparatus having an optical head that enables high-speed access to an optical disk while simplifying and miniaturizing the configuration.

[0005]

An optical head according to the present invention is configured such that a light source for emitting light to irradiate an optical disc and a rotation angle position are changeable, and the light emitted from the light source is used for the optical disc. A light deflecting unit that deflects the light toward different radial positions; and a fixed mirror that extends radially along the recording surface of the optical disk and reflects light from the light deflecting unit toward the optical disk. .

In this optical head, the light emitted from the light source is reflected by the rotating mirror of the light deflecting unit toward the fixed mirror, further reflected by the fixed mirror, and applied to the recording surface of the optical disk. The reflected light is deflected by controlling the rotation angle position of the rotating mirror to change the position, and is projected to different positions in the radial direction of the fixed mirror, and is irradiated to the corresponding radial position of the optical disk by the fixed mirror. Therefore, by controlling the angular position of the rotating mirror within an angular range corresponding to the diameter of the optical disk, it is possible to irradiate an arbitrary diameter position of the optical disk with light and access the optical disk.

[0007]

Next, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a perspective view showing a schematic configuration of a main part of an embodiment in which the present invention is applied to a phase change optical disk device, FIG. 2 is a plan view thereof, and FIG. 3 is a front view. The optical disc 1 is configured to be driven to rotate at high speed by a rotation drive mechanism 2 including a spindle motor. An optical head 3 is disposed at one side of the optical disk 1. The optical head 3 includes a light source unit 4 and a light deflecting unit 5.
And a fixed mirror 6. The light source unit 4
A semiconductor laser 7 for emitting laser light, a collimator lens 8 for collimating the emitted laser light,
An objective lens 9 for converging the collimated laser light on the recording surface of the optical disc 1 is provided. In addition, although not shown, an optical component for controlling the polarization state of the laser light, an optical component for separating the reflected light from the optical disc, and data based on the separated reflected light. Optical components and an electric circuit for reproducing or performing focusing and tracking adjustment control are incorporated in the light control unit.

The light deflecting unit 5 is disposed on the optical axis of the laser light emitted from the light source unit 4 and has a rotating shaft 10.
a rotating motor 1 composed of a pulse motor or the like whose rotation position can be controlled arbitrarily and at a high speed with a vertically upward.
0 and a rotating mirror 11 composed of a plane mirror supported on the rotating shaft 10a of the rotating motor 10. The rotation mirror 11 is controlled to change its rotation angle position with respect to the laser beam from the light source unit 4 in accordance with the rotation position of the rotation motor 10, and transmits the laser beam from the light source unit 4 to the optical disc at the controlled rotation angle position. It is configured to reflect in one direction. In this case, the reflected laser light is in a direction parallel to the surface of the optical disc 1 in the vertical direction of the apparatus, and in the radial direction of the optical disc 1 in the planar direction with a change in the rotation angle position of the rotating mirror 11. The direction is changed.

The fixed mirror 6 is oriented along the surface of the optical disk 1 in the vertical direction of the apparatus and parallel to the recording surface thereof, and in the horizontal direction about the rotation axis 10a of the rotation motor 10 in the rotation mirror 11. It is arranged in an arc shape and along the radius of the optical disc 1. The reflecting surface is inclined downward by 45 ° in the vertical direction, so that the laser light from the rotating mirror 11 is reflected vertically downward, and is irradiated vertically to the surface of the optical disc 1. Is done.

In the optical head 3, the laser light emitted from the semiconductor laser 7 of the light source unit 4 and collected by the objective lens 9 is reflected by the rotating mirror 11 toward the fixed mirror 6, and further reflected by the fixed mirror 6. After being reflected, it is focused on the recording surface of the optical disc 1. Then, by controlling the rotation angle position of the rotation mirror 11 by the rotation motor 10, the laser light from the light source unit 4 is reflected by the rotation mirror 11 when the magnetic disk 1 is reflected by the rotation mirror 11, as shown by a chain line in FIG. The light is deflected in the radial direction, is projected on different positions in the radial direction of the fixed mirror 6, and is irradiated by the fixed mirror 6 on the corresponding radial position of the optical disc 1. Therefore, by controlling the angular position of the rotating mirror 11 in an angular range corresponding to the radial dimension of the optical disk 1, it becomes possible to focus the laser light at an arbitrary radial position on the optical disk 1, and access to the optical disk 1 is reduced. realizable.

Therefore, in the optical head 3, the moving component is only the rotating mirror 11, and the access to the optical disk 1 is only required to change and control the rotation angle position of the rotating mirror 11, and the rotating mirror 11 is downsized. Since it is easy to reduce the weight, high-speed access is possible.
In addition, the optical head 3 has a simple configuration because there is no moving optical system, and the entire optical disk device can be downsized.

Incidentally, tracking control is possible by controlling the rotation angle position of the rotary motor 10 based on the tracking information obtained by the light source unit 4.
Further, focusing control can be performed by controlling the optical axis position of the objective lens 9 in the same light source unit based on the focusing information obtained by the light source unit 4. When the focusing state on the optical disk can be controlled by the focusing control, the optical length between the objective lens 9 and the recording surface of the optical disk 1 does not always need to be kept constant. The optical disk 1 is not limited to an arc shape centered on the rotation axis of the optical disk 1 and may be constituted by a mirror that is straight in the radial direction of the optical disc 1. Further, the cross-sectional shape of the reflection surface of the fixed mirror 6 is formed as a spherical concave surface, and the reflected light is used to convert the laser light into the optical disk 1.
The fixed mirror 6 may be replaced with an objective lens 9 in this case.

Here, in the above embodiment, an example is shown in which the present invention is applied to a phase-change optical disk device, but the present invention can be similarly applied to a magneto-optical disk device. In this case, a magnetic head may be provided along the fixed mirror or at a position facing the fixed mirror with the optical disk interposed therebetween. Alternatively, the present invention can be applied to a read-only optical disk device.

[0014]

As described above, according to the present invention, the light from the light source section is deflected in the radial direction of the optical disc by the light deflecting section, and the deflected light is irradiated on the recording surface of the optical disc by the fixed mirror. Therefore, the optical disk can be accessed only by controlling the rotation of the small and light rotating mirror that constitutes the light deflecting unit, so that high-speed access can be realized and power consumption required for driving can be reduced. Further, since the element for performing the light deflection of the optical head can be constituted only by the rotating mirror and the fixed mirror, the structure of the optical head can be simplified, and the size and cost of the optical disk device can be reduced. Further, since the light irradiation position on the optical disk need only be adjusted by the rotation angle position of the rotating mirror, the control or tracking adjustment can be performed very easily.

[Brief description of the drawings]

FIG. 1 is a perspective view schematically showing an overall configuration of an optical disk device of the present invention.

FIG. 2 is a plan view of the optical disk device of FIG.

FIG. 3 is a front view of the optical disk device of FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Optical disk 2 Rotation drive mechanism 3 Optical head 4 Light source part 5 Light deflecting part 6 Fixed mirror 7 Semiconductor laser 8 Collimator lens 9 Objective lens 10 Rotation motor 11 Rotation mirror

Claims (5)

[Claims] 1. An optical disk apparatus comprising: a rotationally driven optical disk; and an optical head that irradiates an arbitrary position in a radial direction with respect to a recording surface of the optical disk, wherein the optical head irradiates the optical disk. A light source unit for emitting light, a light deflecting unit configured to change the rotation angle position, and deflecting light emitted from the light source unit toward different radial positions on the optical disc; and a recording surface of the optical disc. And a fixed mirror extending radially along the axis and reflecting light from the optical deflection section toward the optical disk. 2. The light source unit emits light in a direction parallel to a recording surface of the optical disk, the light deflecting unit includes a rotating mirror whose rotation angle position can be changed on the parallel plane, and the fixed mirror includes 2. The optical disk device according to claim 1, wherein the optical disk device is disposed along a rotation plane of the rotation mirror. 3. The optical disk device according to claim 2, wherein the fixed mirror is formed in an arc shape about a rotation axis of the rotating mirror. 4. The optical disk device according to claim 2, wherein the rotating mirror is configured to be rotationally driven by a rotating motor whose rotational angle position can be arbitrarily controlled. 5. The optical disk device according to claim 1, wherein the light source unit includes a lens that collects light on a recording surface of the optical disk.