JPH04126320U - Optical pickup actuator - Google Patents

Abstract

(57) [Summary] [Purpose] To obtain an actuator that can adjust the inclination of the optical axis of an objective lens using an optical pickup actuator that uses an elastic body as a support mechanism. [Structure] A magnet is disposed on an elastic body holder fixing part that is fixed to an actuator base in a support mechanism of an optical pickup actuator, and an elastic body holder made of a magnetic substance is movably attracted and supported.

Description

[Detailed explanation of the idea]

0001

[Industrial application field]

This invention is an optical pickup actuator used for recording and reproducing optical discs. Regarding.

0002

[Conventional technology]

Figures 4(a) and 4(b) show examples of conventional optical pickup actuators, so-called FIG. 2 is a schematic configuration diagram showing an example of a spring method. In the same figure, objective lens 1 is It is attached to a lens holder 2, and this lens holder 2 is held by an elastic body 3. It has a supported configuration. That is, one end of the elastic body 3 is attached to the lens holder 2. The other end is attached to the elastic body holder fixing part 10 via the elastic body holder 4 with a set screw 11. Fixed by

0003 The elastic body 3 is made of metal wire or plastic that does not easily stretch in the longitudinal direction. Therefore, the objective lens 1 is movable only in the focusing direction and the tracking direction. The magnetic circuit formed by the magnet 6 and the yoke 5, the focus coil 7, and the track are moved in each direction by a coil 8.

0004

[Problem that the idea aims to solve]

By the way, the most important thing in an optical pickup actuator is the objective lens. The optical axis of the disc is perpendicular to the disk surface, but with conventional actuators, the objective The actuator section does not have a mechanism to adjust the tilt of the lens. Also, generally With this spring-type support mechanism, the optical axis of the objective lens is perfectly aligned with the disk surface. Since it is difficult to make the actuator completely vertical, the actuator is mounted on an optical block (not shown). When installing the actuator base 9, the actuator base 9 had to be tilted to compensate. . This work takes time, and adjustments must be made each time the actuator is replaced. I had to start over.

[0005]

[Means to solve the problem]

Therefore, in this invention, we have developed an optical pickup actuator that uses an elastic body for the support mechanism. At the actuator, the elastic holder fixed to the actuator base by the support mechanism is magnetized. A fixing part that is made of a flexible material and fixes the elastic body holder is fixed by magnetic force. It is characterized by

[0006]

[Effect]

Therefore, since the elastic body holder is attracted to the elastic body holder fixing part by magnetic force, By moving the elastic holder along the elastic holder fixing part, the objective lens This allows the objective lens to be placed in the correct direction.

[0007]

【Example】

FIGS. 1(a) and 1(b) are schematic configuration diagrams showing an embodiment of the present invention, in which an elastic body holder 4 The configuration is the same as the conventional example except for. In the present invention, the elastic holder 4 is made of a magnetic material, and The elastic body holder fixing part 10 on the yoke 5 is attracted by the magnet 6 of the magnetic circuit. Ru. Therefore, in this state, the objective lens 1 is held by the elastic body 3. . Then, as shown in the partial configuration diagram of FIG. 2(a) or (b), the elastic body holder 4 is By tilting or moving along the elastic body holder fixing part 10, the objective lens can be adjusted. The tilt of the lens 1 can be corrected. In this embodiment, the elastic body holder fixing part 10 Since this uses a part of the yoke 5, there is no need to provide a special magnet.

[0008] FIG. 3 is a partial sectional view showing another embodiment, in which the upright portion 1 of the actuator base 9 is 2 is provided with a hemispherical magnet 13, and a magnetic elastic body holder is provided with a recess of the same shape as the hemispherical magnet 13. 4 is provided. This allows holding and tilting of objective lens 1 to be performed as in the previous example. It can be done. In either case, once the lens is set correctly, The holder 4 and the elastic body holder fixing part 10 are completely fixed with adhesive or the like.

[0009]

[Effect of the idea]

As described above, according to the present invention, the elastic body holder is formed of a magnetic material, and the elastic body holder is fixed. Since the structure allows temporary fixation of the objective lens by magnetic force, the tilt of the objective lens can be easily adjusted in the actuator section, resulting in a high-performance optical beam. A backup actuator can be obtained.

[Brief explanation of drawings]

FIGS. 1(a) and 1(b) are schematic configuration diagrams showing one embodiment of the present invention.

FIGS. 2(a) and 2(b) are partial configuration diagrams for explaining the operation of the present invention.

FIG. 3 is a partial cross-sectional view showing another embodiment of the present invention.

FIGS. 4(a) and 4(b) are schematic configuration diagrams showing a conventional example.

[Explanation of symbols]

1 Objective lens 2 Lens holder 3 Elastic body 4 Elastic body holder 5 York 6 magnet 7 Focus coil 8 Tracking coil 9 Actuator base 10 Elastic body holder fixing part 11 Set screw 12 Startup section 13 Magnet

Claims (2)

[Scope of utility model registration request] 1. In an optical pickup actuator using an elastic body for a support mechanism, an elastic body holder fixed to an actuator base by the support mechanism is formed of a magnetic body,
An optical pickup actuator characterized in that a fixing part for fixing the elastic body holder is attracted and fixed by magnetic force. 2. The optical pickup actuator according to claim 1, wherein the magnetic flux of a magnetic circuit for driving the actuator is used as the magnetic force.