JPH041941A - Production of objective lens driver - Google Patents

Abstract

PURPOSE:To improve the adhesiveness between a damper member and a linear elastic support member to suppress the resonance quantity in a resonance frequency band and to improve the servo characteristic by connecting the damper member to the elastic support member in one body. CONSTITUTION:An objective lens 8 is provided to read optically the information recorded on a recording medium together with a lens holder 7 for the lens 8, plural pieces of linear elastic support members 5 which support the holder 7, the damper members 6 provided at the base end sides of the members 5 respectively, and a fixing member 3 which support the members 5 via the members 6. These members 6 are made of the elastic materials and each member 6 is connected to each member 5 in one body when the member 6 is produced. Then the member 6 is put with pressure into a hole of the member 5 with the elastic deformation secured and then fixedly positioned. As a result, the adhesiveness is improved between both members 5 and 6, the resonance quantity is suppressed in a resonance frequency band, and the servo characteristic is improved.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method of manufacturing an objective lens driving device of an optical pickup device used in an optical disk device.

[Prior Art] FIGS. 5 and 6 are perspective views showing a conventional objective lens drive device. The objective lens drive device has a base (1), and a The mounting piece (2) is erected approximately at right angles.

For installation, the fixing member (3) and printed circuit board (4) are fixed to the piece (2) with screws (14), and holes (3a) are drilled in the four corners of the fixing member (3). Holes (4a) are bored in the four corners of the printed circuit board (4) in opposition to the holes (3a).

Further, a damper member (6) for suppressing the amount of resonance at the resonant frequency is inserted into the hole (3a) and is fixed with an adhesive or the like, and a linear elastic support member (5) is inserted into the damper member (6).
) is inserted and fixed with adhesive or the like.

Further, the tip of the linear elastic support member (5) is inserted into a hole (7b) drilled in a support piece (7a) that protrudes laterally of the lens holder (7), and is inserted into a hole (7b) made with a bonding agent such as solder (13). ), whereby the lens holder (7) is swingably supported by the linear elastic support member (5).

The lens holder (7) holds an objective lens (8), and tracking coils (9) are wound vertically on both sides of the lens holder (7). A focusing coil (10) is wound around the central horizontal portion of the lens.

Further, on the base (1), there is a U-shaped yoke (11) opposite to the side of the lens holder (7) where the support piece (7a) is not provided.
is erected, and one end (1) of the U-shaped yoke (11)
A permanent magnet (12) is fixed to 1a), and one end (llb) of a yoke (11) is also located between the focusing coil (10) and the lens holder (7).

In addition, what is shown in the figure (3C) is a positioning hole that fits into a positioning protrusion provided on the piece (2).

Next, a method for manufacturing a conventional objective lens driving device will be described.

Insert one end of the linear elastic support member (5) into the damper member (6) and adhere with adhesive, and then fit each damper member (6) into the four corner holes (3a) of the fixing member (3). and attach with adhesive.

Then, the other end of the linear elastic support member (5) is fitted into the hole (7b) made in the support piece (7a) of the lens holder (7), and the linear elastic support member (5) is ) is fixed to the support piece (7a).

Thereby, the lens holder (7) is attached to the linear elastic support member (
5) is swingably supported.

Furthermore, the fixing member (3) and the printed circuit board (4) are fixed to the mounting piece (2) with screws (14).

At this time, the installation involves positioning the fixing member (3) by fitting the positioning protrusion provided on the piece (2) with the hole (3C) drilled in the fixing member (3), and By aligning the four corner holes (3a) of the fixing member (3) with the four corner holes (4a) of the printed circuit board (4), the printed circuit board (
4) Position.

[Problems to be Solved by the Invention] Since the conventional objective lens driving device is configured as described above, the linear elastic support member (5) and the damper member (6)
Because they were bonded with adhesive, it was difficult to maintain a constant bonding accuracy, and the amount of resonance could not be suppressed, which adversely affected servo characteristics. Also, during assembly, adhesive was applied in many places. Because they are used in

This invention has been made to solve the above-mentioned problems, and provides an objective lens drive device that improves the adhesion between a damper member and a linear elastic support member, takes damping, and is easy to assemble. With the goal.

[Means for Solving the Problems] A method for manufacturing an objective lens drive device according to the present invention includes: an objective lens for optically reading information recorded on a recording medium; a lens holder holding the objective lens; comprising a plurality of linear elastic support members that support the lens holder, a damper member provided on the proximal end side of the linear elastic support member, and a fixing member that supports the linear elastic support member via the damper member, The damper member is made of an elastic material, and when the damper member is molded, the damper member is integrally connected to a linear elastic support member, and the damper member is press-fitted into a hole drilled in the fixing member while maintaining elastic deformation. It is characterized by positioning and fixing.

[Function] The method for manufacturing an objective lens drive device according to the present invention improves the adhesion between the damper member and the linear elastic support member by integrally bonding the damper member to the linear elastic support member during molding of the damper member. , proposes the amount of resonance in the resonant frequency band and simplifies the assembly process.

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

As shown in Fig. 1, the objective lens driving device has a base (
1), and a mounting piece (2) is erected on the - side of the base (1) at a substantially right angle.

For installation, the fixing member (3) and printed circuit board (4) are fixed to the piece (2) with screws (14), and holes (3a) are drilled in the four corners of the fixing member (3). Holes (4a) are bored in the four corners of the printed circuit board (4) in opposition to the holes (3a).

Furthermore, a linear elastic support member (5) is inserted into the hole (3a) during molding.
A damper member (6) made of an elastic material integrally coupled to the damper member (6) for suppressing the amount of resonance at the resonant frequency is press-fitted while maintaining elastic deformation.

Further, the tip of the linear elastic support member (5) is inserted into a hole (7b) drilled in a support piece (7a) that protrudes laterally of the lens holder (7), and is inserted into a hole (7b) made with a bonding agent such as solder (13). ), whereby the lens holder (7) is swingably supported by the linear elastic support member (5).

The lens holder (7) holds an objective lens (8), and tracking coils (9) are wound vertically on both sides of the lens holder (7). A focusing coil (10) is wound around the central horizontal portion of the lens.

Furthermore, a U-shaped yoke (11) is provided on the base (1), facing the side of the lens holder (7) where the supporting piece (7a) is not provided, and the U-shaped yoke (11) One end of (11
A permanent magnet (12) is fixed to a), and one end (11b) of the yoke (11) is also located between the focusing coil (10) and the lens holder (7).
(see figure).

In addition, what is shown in the figure (3C) is a positioning hole that fits into a positioning protrusion provided on the piece (2).

Further, as shown in FIG. 2(a), the damper member (6) includes a large diameter portion (6a), a joint portion (6b), and a small diameter portion (6c).
) and a tension portion (6d), which is integrally connected to one end of the linear elastic support member (5) during molding.

Next, a method for manufacturing the objective lens driving device of the present invention will be explained.

The tension part (6d) of the damper member (6) is fixed to the fixing member (3).
After inserting it into the hole (3a), grasp the tension part (6d) and pull it until the joint part (6b) is fully fitted into the hole (3a).

Then, the joint portion (6b) of the damper member (6) is formed as shown in Fig. 2 (
As shown in b), it is elastically deformed and press-fitted into the hole (3a).

Furthermore, when the tension part (6d) is continued to be pulled, the tension part (6d)
6d) is cut at the small diameter part (6c) (see Fig. 2(c)), and the joint part (6b) is fitted into the hole (3a) of the fixing member (3) by elastic recovery, thereby making the damper member ( 6) is positioned.

Then, the other end of the linear elastic support member (5) is fitted into the hole (7b) made in the support piece (7a) of the lens holder (7), and the linear elastic support member (5) is ) is fixed to the support piece (7a).

Thereby, the lens holder (7) is attached to the linear elastic support member (
5) is swingably supported.

Furthermore, the fixing member (3) and the printed circuit board (4) are fixed to the mounting piece (2) with screws (14).

At this time, the installation involves positioning the fixing member (3) by fitting the positioning protrusion provided on the piece (2) with the hole (3C) drilled in the fixing member (3), and By aligning the four corner holes (3a) of the fixing member (3) with the four corner holes (4a) of the printed circuit board (4), the printed circuit board (
4) Position.

Further, in the above embodiment, the joint part (6b) of the damper member (6) is press-fitted into the hole (3a) of the fixing member (3) from the side where the lens holder (7) is located, but the invention is not limited to this. figure,
As shown in FIG. 3, the connecting portion (6b) of the damper member (6) may be press-fitted into the hole (3a) of the fixing member (3) from the side where the printed circuit board (4) is located.

In this case, the damper member (6) has a large diameter portion (6a
) and the coupling part (6b).

When assembling, the linear elastic support member (5)
One end is inserted into the hole (3a) of the fixing member (3) and fitted into the hole (7b) made in the support piece (7a) of the lens holder (7), and linear elastic support is provided by the adhesive (13). Component (5)
is fixed to the support piece (7a).

Then, the large diameter part (6a) of the damper member (6) is pushed by the printed circuit board (4) (see FIG. 4(a)), and the coupling part (6b) is fully fitted into the hole (3a).

Then, the joint portion (6b) of the damper member (6) is formed as shown in Fig. 4 (
The damper member (6) is elastically deformed and press-fitted into the hole (3a) as shown in b), and the connecting portion (6b) is elastically recovered and connected to the hole (3a) of the fixing member (3). (See FIG. 4(c)).

Furthermore, the fixing member (3) and the printed circuit board (4) are fixed to the mounting piece (2) with screws (14).

At this time, the installation involves positioning the fixing member (3) by fitting the positioning protrusion provided on the piece (2) with the hole (3C) drilled in the fixing member (3), and By aligning the four corner holes (3a) of the fixing member (3) with the four corner holes (4a) of the printed circuit board (4), the printed circuit board (
4) Position.

[Effects of the Invention] As explained above, according to the present invention, since the damper member is integrally connected to the linear elastic support member during molding of the damper member, the tight contact between the damper member and the linear elastic support member is improved. It is possible to suppress the amount of resonance in the resonant frequency band and improve the servo characteristics. In addition, since the damper member is press-fitted into a hole drilled in the fixing member while retaining its elastic deformation and is positioned and fixed, the number of adhesive points can be reduced and ease of assembly improved, thereby reducing costs. can be achieved.

[Brief explanation of the drawing]

FIG. 1 is an exploded perspective view showing the main parts of an objective lens driving device according to an embodiment of the present invention, FIG. 2 is a perspective view showing the structure of a damper member and the operation of the present invention, and FIG. FIG. 4 is a perspective view showing the structure and operation of a damper member according to another embodiment of the present invention, and FIGS. It is a perspective view showing an objective lens drive device. In the figure, (3) is a fixing member, (3a) is a hole, (5) is a linear elastic support member, (6) is a damper member, (7) is a lens holder, and (8) is an objective lens. Note that the same reference numerals in the figures indicate the same or corresponding parts. 1.3

Claims (1)

[Claims] an objective lens for optically reading information recorded on a recording medium; a lens holder holding the objective lens;
a plurality of linear elastic support members that support the lens holder;
a damper member provided on the proximal end side of the linear elastic support member;
A method for manufacturing an objective lens drive device, which includes a fixing member that supports a linear elastic support member via a damper member, and supports an objective lens so as to be movable in an optical axis direction and a direction perpendicular to the optical axis direction. The damper member is made of an elastic material, and when the damper member is molded, the damper member is integrally connected to a linear elastic support member, and the damper member is press-fitted into a hole drilled in the fixing member while maintaining elastic deformation. A method for manufacturing an objective lens driving device, characterized in that the objective lens driving device is positioned and fixed by