JP2692549B2 - Optical head of optical disk device - 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 head for an optical disk device, and more particularly to an optical head for an optical disk device in which a lens holder and light emitting / receiving means are integrated.

[0002]

2. Description of the Related Art Conventionally, an optical head of an optical disk device of this type has a lens holder and a light emitting / receiving means integrated for the purpose of downsizing, and has a structure as shown in FIGS. It was In the optical head of this optical disk device, a lens holder 100 holding an objective lens 101 is supported by four wires 201 attached to a base 200. An integrated chip 103 having a light emitting / light receiving function is attached to the lens holder 100, and an optical path 104 is formed below the integrated chip 103.

According to the optical head of this optical disk device, the track direction driving coil 107 attached to the lens holder 100 is energized, and the electromagnetic interaction between the coil 107 and the magnet 202 attached to the base 200 causes the lens to move. The entire holder can be moved in the track direction. In addition, the focus direction drive coil 108 is energized, and the entire lens holder can be moved in the focus direction by electromagnetic interaction with the magnet 202. After adjusting the position and focus of the objective lens 101 in this way, the light emitted from the integrated chip 103 is passed through the optical path 10.
4 is reflected by the reflection mirrors 105 and 106 and guided to the objective lens 101, and the light that has passed through the objective lens 101 is reflected by the reflection mirrors 105 and 106 and received by the integrated chip 103. Can be read.

[0004]

However, in the optical head of the above-mentioned conventional optical disk device, the lens holder 1 is used.
00 is supported by four wires 201, so the lens holder 1
The posture of 00 changes. Therefore, there is a problem that the signal reading ability is deteriorated and a high-speed access operation cannot be performed.

Further, like the optical heads described in JP-A-64-33732 and JP-A-3-122830, the optical head is rotated in the track direction at the center of gravity of the lens holder to enable high-speed access. However, this optical head has not been integrated with an integrated chip or an optical path that is a light emitting / light receiving means, and thus cannot be downsized.

The present invention has been made in view of the above problems, and an object of the present invention is to provide an optical head of an optical disk device which can be accessed at high speed and which is downsized.

[0007]

In order to achieve the above object, the optical head of the optical disk device of the present invention is an optical head.
Each is attached to the base side of the
Bendable elastic body for upper and lower focusing, and
These are attached to the tips of the elastic bodies for upper and lower focusing.
The upper and lower rotating means attached to each
By the lower and upper rotating means,
The lens holder that is rotatably supported at the bottom and this lens
The objective lens held on one side of the lens holder and the lens
The objective lens integrally provided on the other side of the lens holder.
Emitting light toward or receiving light through the objective lens /
It is placed inside the light receiving integrated chip and the lens holder.
Between the objective lens and the light emitting / receiving integrated chip
Light emitting / light receiving means including a reflection mirror forming an optical path
This is a configuration including:

[0008]

According to the optical head of the optical disk device, the position and focus of the objective lens can be adjusted by bending the elastic body for focusing in the focus direction and rotating the lens holder in the track direction by the rotating means. . Then, the light emitting / light receiving means integrally provided in the lens holder emits light toward the objective lens or receives light through the objective lens,
It is possible to write and read signals.

[0009]

Embodiments of the present invention will be described below with reference to the drawings. 1 is a plan view showing an optical head of an optical disc device according to a first embodiment of the present invention, and FIG. 2 is a sectional view taken along the line AA of FIG. As shown in the figure, the optical head of the present embodiment is integrally attached to the base 1, a lens holder 40 supported by a leaf spring 10 as an elastic body for focusing and a rotating means 20, and a lens holder 40. It is composed of a light emitting / light receiving means 50.

As shown in FIG. 1, the base 1 has magnets 2 on both sides thereof, and a support portion 3 is provided upright on the rear end portion thereof. The base end portions are fixed to the upper and lower surfaces of the support portion 3, and a pair of upper and lower leaf springs 10 bendable in the focus direction are provided. Furthermore, this pair of upper and lower supports
Upper and lower rotating means 20 are respectively provided at the tips of the parts 3 and support the upper and lower parts of the lens holder 40 so as to be movable in the track direction and the focus direction.

The upper and lower rotating means 20 are respectively
As shown in FIG. 2, the protrusion 2 is provided at the center of gravity of the lens holder 40 in which the light emitting / receiving means 50 is assembled.
1 and a bearing 22 provided at the tip of the leaf spring 10 and rotatably fitted in the protrusion 21.
That is, the lens holder 40 to which the light emitting / receiving means 50 is attached can rotate in the track direction about the center of gravity. A lens mounting hole 42 is provided at the tip of such a lens holder 40, and an objective lens 41 is fitted into the lens mounting hole 42. A chip mounting hole 43 for mounting a light emitting / receiving integrated chip 51 described later is provided at the rear end of the lens holder 40.

On both sides of the lens holder, as shown in FIG. 1, a track direction driving coil 44 is provided.
Is attached, and a focus direction drive coil 45 is attached to the upper surface in the vicinity thereof. As a result, the track direction drive coil 44, the focus direction drive coil 45, and the magnet 2 form a magnetic circuit. That is, the electromagnetic interaction between the track direction driving coil 44 and the magnet 2 moves the lens holder 40 in the track direction, and the electromagnetic interaction between the focus direction driving coil 45 and the magnet 2 causes the lens holder 40 to move in the focus direction. To move to.

As shown in FIG. 2, the light emitting / light receiving means 50 is attached to the lower side of the lens holder 40.
The light emitting / receiving unit 50 guides the integrated chip 51 mounted in the chip mounting hole 43 of the lens holder 40 and the light from the integrated chip 51 to the objective lens 41 or the light from the objective lens 41 to the integrated chip 51. It is formed by the optical path 52 that leads.

Specifically, the lower part of the lens holder 40 is
Reflective mirrors 55, 5 are provided on the rear and front parts of the bottom plate 54 that constitutes the mirror.
It has a structure in which 6 is attached. That is, the reflection mirror 55 has the holes 4 formed on the lower side of the integrated chip 51.
3, the reflection mirror 56 is attached at an angle of about 45 °, and the reflection mirror 56 has a hole 57 formed in the lower side of the objective lens 40.
Mounted at an angle of about 45 °. As a result, the light emitted from the integrated chip 51 passes through the holes 53.
After passing through, the light is reflected at a right angle by the reflection mirror 55, is reflected at a substantially right angle by the reflection mirror 56, and then passes through the hole 57 to reach the objective lens 41. On the contrary, the light condensed by the objective lens 41 is transmitted through the holes 57,
The light emitting / light receiving integrated chip 51 receives light through the reflecting mirrors 56, 55 and the hole 53.

Next, the operation of this embodiment will be described.
When writing a predetermined signal on an optical disk (not shown), the track direction drive coil 44 is energized. Then, the lens holder 40 is moved in the track direction by electromagnetic interaction between the track-direction driving coil 44 and the magnet 2. Specifically, the lens holder 40,
A required amount of rotation is carried out in the track direction around the center of gravity supported by the upper and lower rotating means . In this way, when the lens holder 40 is rotated to a predetermined track and then the focus direction drive coil 45 is energized,
Lens holder 4 by electromagnetic interaction with magnet 2
0 is moved in the focus direction, and the objective lens 41 is focused on the optical disc.

After focusing the position of the objective lens 41 in this way, the integrated chip 51 is caused to emit light to read the optical disc. That is, when light is emitted from the integrated chip 51, this light is emitted through the hole 53 and the reflection mirror 5.
The light enters the objective lens 41 through 5, 56 and the hole 57.
Then, the light passing through the objective lens 41 is focused on a predetermined track of the optical disc, is then reflected, and enters the objective lens 41. The light that has passed through the objective lens 41 is received by the integrated chip 51 via the hole 57, the reflection mirrors 56 and 55, and the hole 53.

As described above, in the optical head of this embodiment, the light emitting / receiving means 50 for reading the optical disk is integrally assembled to the lens holder 40, so that the entire optical head can be downsized. Further, when the lens holder 40 having the light emitting / receiving means 50 attached thereto moves in the track direction, the position of the center of gravity of the lens holder 40
Since so as to rotate about a not that position of the lens holder 40 is deviated from a desired position by the inertia force during the track movement,
As a result, the ability to read signals from the optical disk is improved,
High-speed access becomes possible.

Next, a second embodiment of the present invention will be described. 3 is a plan view showing an optical head of an optical disk device according to a second embodiment of the present invention, and FIG. 4 is a view taken along the line B- in FIG.
It is B sectional drawing. In this embodiment, the leaf spring 6 is used as the rotating means.
The difference from the first embodiment is that 0 is used. That is, as shown in FIG. 4, the upper and lower mounting member 61 is attached respectively to the tip of the upper and lower pair of plate springs 10 attached to the support part 3, respectively attached to upper and lower center of gravity of the lens holder 40 A material 62 is attached. Then, the leaf spring 6 having an extremely smaller width than the leaf spring 10
0 indicates the upper and lower mounting members 61 and the lens holder 40.
It is attached between the upper and lower attachment members 62 .

As a result, when the focusing direction driving coil 45 is energized, the lens holder 40 with the light emitting / receiving means 50 assembled thereto receives a force in the focusing direction due to the electromagnetic interaction with the magnet 2. At this time, the leaf spring 60 is twisted corresponding to the force in the focus direction,
The lens holder 40 can rotate to a predetermined track position. The other configuration, operation, and effect are the same as those of the first embodiment, and the description thereof is omitted.

[0020]

As described above, according to the optical head of the optical disk apparatus of the present invention, the elastic body for focusing is bent in the focusing direction, and the lens holder is rotated in the tracking direction by the rotating means, whereby the position of the objective lens is changed. ， Because the focus can be adjusted, high-speed access operation can be performed. Further, since the light emitting / light receiving means capable of reading out a signal is integrally provided on the lens holder, the overall size of the optical head can be reduced.

[Brief description of the drawings]

FIG. 1 is a plan view showing an optical head of an optical disc device according to a first embodiment of the present invention.

FIG. 2 is a sectional view taken along line AA of FIG.

FIG. 3 is a plan view showing an optical head of an optical disc device according to a second embodiment of the present invention.

FIG. 4 is a sectional view taken along the line BB in FIG. 3;

FIG. 5 is a plan view showing an optical head of an optical disc device according to a conventional example.

6 is a cross-sectional view taken along line CC of FIG.

[Explanation of symbols]

 1 Base 10 Leaf Spring 20 Rotating Means 21 Projection 22 Bearing 40 Lens Holder 41 Objective Lens 50 Light-Emitting / Light-Receiving Means 51 Integrated Chip 52 Optical Path 55, 56 Reflection Mirror

Claims (1)

(57) [Claims] 1. The optical head is mounted on the base side of the optical head.
The upper and lower four sides are bendable in the focus direction.
The elastics for focusing and the tips of these upper and lower focusing elastics are
The upper and lower rotating means attached to each of them and the upper and lower rotating means respectively provide a substantially center of gravity position.
Lens holder with rotatably supported top and bottom
And an objective lens held on one side of the lens holder and the objective lens integrally provided on the other side of the lens holder.
Light is emitted toward the lens or light is received through the objective lens
Light emitting / light receiving integrated chip and inside of the lens holder
Placed on the objective lens and the light emitting / receiving integrated chip
Light emission consisting of a reflection mirror forming an optical path between
An optical head for an optical disk device, comprising an optical receiver .