JPH01178138A - Optical disk recording and reproducing device - Google Patents

Abstract

PURPOSE:To eliminate mechanical resonance in a coil itself and to perform accurate recording and reproduction on an optical disk by holding an elastic body in the gap part of the coil. CONSTITUTION:An objective lens 1 is fixed on an objective lens holding body 2 with a rectangular coil 3 which holds the elastic body 11, and is connected to a turning body 5 by an elastic member deformable freely in a focusing direction E and the turning body 4 is supported by a bearing 6 in such a way that it can be turned freely. And when a current corresponding to a quantity of plane shaking of the disk is supplied to the coil 3, a coil part 3b in a magnetic gap formed by a yoke 7c and a magnet 8 generates a driving force electromagnetically in the focusing direction E, however, since the elastic body is held in the gap part between the coils 3a and 3b, the deformation of the coil part 3b can be eliminated, and no mechanical resonance is generated, and the objective lens can be moved by a change quantity corresponding to a command current from the outside. In such a way, it is possible to perform the recording and the reproduction of information on the disk accurately.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to an optical disc recording and reproducing device for optically recording and reproducing information, such as a compact disc player and an optical disc device.

2. Description of the Related Art In recent years, many recording and reproducing devices for video, audio, etc. using optical disks have been announced, and related technologies have also progressed accordingly. In particular, various methods have been proposed for optical pickup, but there is a problem in high-speed access when used as an external storage device for a computer. There are many unresolved problems in terms of high-speed access in optical disk devices, and technological development in this field is desired. .

Optical information reading devices have been known for a long time, and in particular, a mechanism for driving an objective lens two-dimensionally in order to correct focusing and tracking in a responsive manner was developed in Japanese Patent Laid-Open No. 61.
It is shown in the publication No.-123030.

A conventional optical disc recording and reproducing apparatus will be explained below.

7 and 8 show an example of a conventional optical disk recording/reproducing device, FIG. 7 is a perspective view thereof, and FIG. 8 is an A-A in FIG. 7.
/It is a sectional view.

The objective lens 1 is fixed to an objective lens holder 2 together with a rectangular coil 3 having a cavity, and is connected to a rotating body 5 by an elastic member 4 that is deformable in a focusing direction E. The rotating body 4 is rotatably supported by a bearing 6.

A yoke 7c is arranged on both sides of the coil 3 with a predetermined gap between them, and forms a magnetic circuit together with a magnet 8 attached to the yoke 7C.

The operation of the optical disc recording and reproducing apparatus configured as described above will be described below.

The objective lens 1 is connected to a yoke 7 by supplying a signal obtained by an optical disk (not shown in the figure) and a means for detecting the amount of surface runout of this disk to a coil 3.
A driving force in the focusing direction E is applied electromagnetically by a magnetic circuit composed of C and a magnet 8, and the driving force is applied electromagnetically in the focusing direction E to follow the surface runout of the disk, and also to move the disk in the tracking direction F.
It rotates around the bearing 6 by a drive circuit not shown in the figure.

Problems to be Solved by the Invention However, in the conventional configuration described above, the driving force generated by the coil 3 generates mechanical resonance of this coil itself and is transmitted to the objective lens 1 via the objective lens holder 2. The problem was that it was difficult to record and play back information.

The present invention solves the above-mentioned conventional problems, and is an optical disk recording and reproducing device that prevents vibration of the objective lens by eliminating the mechanical resonance generated in the coil 3, and can accurately record and reproduce information on the disk. The purpose is to provide

Means for Solving the Problems In order to solve the above objects, the optical disk recording and reproducing apparatus of the present invention has a structure in which an elastic body is held in the gap of the coil.

Function: This configuration eliminates mechanical resonance of the coil itself, which has a high rigidity in the drive section of the coil.

EXAMPLE An example of the present invention will be described below with reference to the drawings.

FIG. 1 is a perspective view of an optical disc recording/reproducing apparatus of the present invention, and FIG. 2 is a sectional view taken along line A-' in FIG.

In FIG. 1, an objective lens 1 is fixed to an objective lens holder 2 together with a rectangular coil 3 holding an elastic body 11 in a cavity, and an elastic member 4 deformable in a focusing direction E.
It is connected to the rotating body 6 by. The rotating body 4 has a bearing 6
is rotatably supported by. A yoke 7C is arranged on both sides of the coil 3 with a predetermined gap, and forms a magnetic circuit together with a magnet 8 attached to the yoke 7C.

The operation of the optical disc recording and reproducing apparatus configured as described above will be described below.

The objective lens 1 is connected to a yoke 7 by supplying a signal obtained by an optical disk (not shown in the figure) and a means for detecting the amount of surface runout of this disk to a coil 3.
A driving force in the focusing direction E is applied electromagnetically by a magnetic circuit composed of C and a magnet 8, and the driving force is applied electromagnetically in the focusing direction E to follow the surface runout of the disk, and also to move the disk in the tracking direction F.
It rotates around the bearing 6 by a drive circuit not shown in the figure. In the cross-sectional view shown in FIG. 2, when a current corresponding to the amount of surface runout of the disk is supplied to the coil 3 from the outside, a portion 3b of the coil in the magnetic gap formed by the yoke 7C and the magnet 8 electromagnetically focuses. A driving force is generated in the direction E, and in the conventional optical disk recording/reproducing device, the portion 3b is slightly deformed, resulting in mechanical resonance, which is transmitted to the objective lens.
a.

For example, metal or plastic is placed in the gap between 3b.

3b of the coil by holding an elastic material such as adhesive
The objective lens can be moved by the amount of change according to the command current from the outside without causing any mechanical resonance.

As described above, according to this embodiment, by holding an elastic body in the gap of the coil having a gap, vibration of the objective lens can be eliminated and information can be accurately recorded and reproduced on the disk. Can be done.

In this embodiment, the elastic body held in the cavity of the coil may be formed of a part of the objective lens holder as shown in FIG. The coil may be fixed to the body 12 and then fixed to the objective lens holder.

Further, although the coil winding shape of this embodiment is square, there is no problem with coil winding shapes such as round, triangular, polygonal, etc.

Further, there is no problem whether the outer shape of the coil of this embodiment is L-shaped as shown in FIG. 5 in which portions 3a and 3b are orthogonal, or U-shaped as shown in FIG. 6, or any other shape.

Further, in this embodiment, the elastic body held in the void of the coil may be held in various ways, such as adhesion or fusion, and any method may be used.

Furthermore, it goes without saying that the configuration of the magnetic circuit for driving the coil in this embodiment is not limited to that of this embodiment.

Effects of the Invention As described above, in the present invention, by holding an elastic body in the gap of a coil having a gap, the mechanical resonance of the coil itself is eliminated, and accurate recording and reproduction on an optical disk can be realized. Our goal is to provide an excellent optical disc recording/reproducing device.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of an optical disc recording/reproducing apparatus according to an embodiment of the present invention, FIG. 2 is a sectional view taken along line AA of FIG. 1, and FIGS. 3 to 6 are main views of other embodiments of the present invention. Cross section, 7th
The figure is a perspective view of a conventional optical disc recording/reproducing device.
The figure is a sectional view taken along the line A-A in FIG. 7. 1... Objective lens, 2... Objective lens holder, 3... Coil, +a, 4b...
・Elastic member, 6...- Rotating body, 6... Bearing, ? a, 7b, 7c...York, 8a
, sb... Magnet, 11... Elastic body, 1
2... Coil holder.

Claims (1)

[Claims] an objective lens, an objective lens holder for holding the objective lens, a coil having a gap fixed to the objective lens holder, a yoke installed at a position facing the coil with a predetermined gap, and the yoke. 1. An optical disk recording/reproducing device comprising: a magnet attached to a coil; and an elastic body held in a gap of the coil.