JP2529457Y2 - Optical pickup device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to an optical pickup device in which a permanent magnet for control constituting a magnetic circuit of an actuator is attached to a main body base.

[Conventional technology]

FIG. 3 is a perspective view of a conventional optical pickup device,
1 is an objective lens, 2 is an actuator holding the objective lens, 3 is a control coil fixed to the actuator 2, 4 is a main body base having a mounting shaft 6 of the actuator 2, and 5 is a relative to the control coil 3. The control permanent magnet 7 is fixed to the main body base 4 at a predetermined distance so as to face, and a pair of mounting walls 7 provided on the main body base 4 for restricting the mounting position.

Here, a mechanism for moving the actuator 2 holding the objective lens 1 in the direction a in the figure generally includes a control coil 3 fixed to the actuator 2 and a control permanent magnet 5 attached to the main body base 4. The operation is performed by a magnetic circuit, and a current flows through the control coil 3. The actuator 2 can be moved in the direction a by utilizing the repulsion of the magnetic field generated by the control coil 3 and the magnetic field of the control permanent magnet 5.

Accordingly, a predetermined movable amount can be obtained in the a direction by controlling the amount of current flowing through the control coil 3.

The control coil 3 is attached in close contact with the actuator 2 and is fixed with an adhesive or the like.

On the other hand, the control permanent magnet 5 needs to be accurately fixed at a specific distance so as not to contact the control coil 3.

Hereinafter, a conventional method of mounting the control permanent magnet 5 will be described with reference to FIG.

A pair of mounting walls 7, 7 are formed on the main body base 4 in order to accurately mount the control permanent magnet 5, and a positioning jig 8 is used instead of the actuator 2 in FIG. . The positioning jig 8 has a hole of the same size as the fixed shaft 6 serving as the rotation center of the actuator 2, and this hole is fitted to the fixed shaft 6 and is attached to the main body base 4. After that, the control permanent magnet 5 is attached in a form in which it is brought into close contact with the pair of mounting walls 7, 7 and the positioning jig 8, and is fixed to the main body base 4 with an adhesive or the like.

Next, the positioning jig 8 is removed from the main body base 4 and the actuator 2 is mounted on the mounting shaft 6 of the main body base 4 in the same manner as the positioning jig 8, so that the number of subtle distances of the control permanent magnets 5 can be increased. But it can be installed under the same conditions.

[Problems to be solved by the invention]

As described above, the conventional optical pickup device includes:
Since the distance from the control coil 3 is kept constant by using the mounting jig 8, the fixed shaft 6 is easily damaged, and the mounting position of the permanent magnet 5 due to wear of the mounting jig 8. Of the permanent magnet 5 may be unstable because the permanent magnet 5 may become unstable, or the adhesive may not be in contact with the jig 8 when the jig 8 is pulled out. There were problems such as there.

The present invention has been made in order to solve the above problems, and to obtain an optical pickup device in which a control permanent magnet can be accurately attached to a main body base without using a positioning jig. With the goal.

[Means for solving the problem]

The optical pickup device according to the present invention has a main body base on which an actuator holding an objective lens is attached,
In an optical pickup device in which a pair of mounting walls for controlling a mounting position of a control permanent magnet for controlling the actuator are provided in a pair corresponding to both sides of the actuator, a flange portion is formed on the control permanent magnet, The mounting wall is formed with a restricting portion which is in contact with the flange portion to determine the position of the control permanent magnet in the direction of the actuator.

[Action]

The optical pickup device according to the present invention is configured such that the flange portion of the control permanent magnet abuts on the positioning regulating portion formed on the mounting wall of the main body base, so that the regulating portion serves as a jig and is conventionally used. There is no need for mounting jigs, and there is no risk of damaging the control permanent magnets or the fixed shaft.

In addition, the mounting accuracy and the adhesive strength can be improved.

〔Example〕

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

In FIG. 1, reference numeral 4 denotes a main body base, 5 denotes a control permanent magnet having flanges 5a formed on both side ends, 7 denotes a pair of mounting walls formed integrally with the main body base 4, and As shown in the figure, a positioning concave portion 7a functioning as a positioning restricting portion with which the flange portion 5a of the control permanent magnet 5 abuts is formed.
While pressing it against the mounting wall 7 with an adhesive.

As a result, as shown in FIG.
The magnetic circuit that is movable in the direction is formed at a certain distance so that the control coil 3 and the control permanent magnet 5 do not come into contact with each other.

The drive circuit of the actuator 2 drives the actuator 2 in the direction a by utilizing the repulsive force of the magnetic field generated by the control permanent magnet 5 and the magnetic field obtained by applying a current to the control coil 3. In the case of an optical pickup device, this driving force is preferably as large as possible in practical use, and thereby reduction in power consumption and improvement in performance can be achieved.

For this reason, increasing the rate of the magnetic circuit is an important point.

In general, it is known that the influence of a magnetic field is inversely proportional to the square. Therefore, it is desirable to make the distance between the control permanent magnet 5 and the control coil 3 as short as possible so that the magnetic field can be used effectively.

However, if the distance is too close, the control permanent magnet 5 and the control coil 3 come into contact with each other and hinder the movement of the actuator 2.

Further, the accuracy of the actuator sensitivity greatly depends on the accuracy of the attachment of the control permanent magnet 5.

However, according to the configuration of the above-described embodiment, the positioning of the control permanent magnet 5 is performed by the contact between the concave portion 7a formed in the pair of mounting walls 7 and the flange portion 5a formed in the permanent magnet 5; It can be realized with precision.

In the above-described embodiment, the mounting of the control permanent magnet 5 that is movable in the direction a is described. A similar configuration can be adopted for a permanent magnet (not shown).

[Effect of the invention]

As described above, according to the present invention, a flange is formed on the control permanent magnet, and on the mounting wall, a restricting portion that contacts the flange and determines the position of the control permanent magnet toward the actuator is provided. Since it is formed, the permanent magnet for control can be attached with high accuracy without damaging the permanent magnet for control and the fixed shaft without using a separate positioning jig as in the past. is there.

[Brief description of the drawings]

FIG. 1 is a perspective view of an optical pickup device according to the present invention, FIG. 2 is a perspective view for explaining a method of attaching a control permanent magnet, FIG. 3 is a perspective view of a conventional optical pickup,
FIG. 4 is a perspective view for explaining a conventional method of mounting a control permanent magnet. In the figure, 1 is an objective lens, 2 is an actuator, 3 is a control coil, 4 is a main body base, 5 is a control permanent magnet,
5a is a flange, 6 is a fixed shaft, 7 is a mounting wall, and 7a is a positioning recess. In the drawings, the same reference numerals indicate the same or corresponding parts.

Claims (1)

(57) [Scope of request for utility model registration] 1. A pair of mounting walls for regulating the mounting position of a control permanent magnet for controlling the actuator are provided on a main body base on which an actuator for holding the objective lens is mounted, corresponding to both sides of the actuator. An optical pickup device comprising: a flange formed on the control permanent magnet;
An optical pickup device, wherein a restricting portion which is in contact with the flange portion and determines a position of the control permanent magnet in the direction of the actuator is formed.