JPH02220238A - Objective lens supporting device - Google Patents

Abstract

PURPOSE:To obtain an inexpensive objective lens supporting device which has the improved adhesion and has a satisfactory assembling property by forming a damper member on a fixing member by integrating molding and coupling a linear elastic supporting member integrally at the time of forming the damper member. CONSTITUTION:Each damper member 11 is preliminarily formed on the fixing member 8 by the integrating molding, and one end of each linear elastic supporting member 3 is fixed integrally at the time of forming each member 11. At the time of assembling, only the other end of the member 3 is inserted into each supporting hole 2B formed in each supporting piece 2A of a lens holder 2 and adhered with an adhesive to support the holder 2 by the member 3. Thereafter, the member 8 and a printed board 9 are fixed to a base 10 by a fixing screw 13. By such a constitution, the force of coupling between members 3 and 11 is strong and the degree of adhesion is satisfactory. Consequently, the extent of resonance of the member 3 in the resonance frequency band is reduced to improve the servo characteristic. The process of adhesion between members 8 and 11 is eliminated and the number of parts is reduced, and the assembling property is improved and the cost is reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an objective lens support device for an optical pickup device used in an optical disk device or the like.

[Conventional technology]

FIG. 2 is a perspective view showing the objective lens support device of the second type optical pickup device, and in the figure, 1 is the objective lens;
2 is a lens holder that holds this objective lens 1;
It has a plurality of support pieces 2A, 2A. 3, 3...
- Support piece 2A provided at one end on the lens holder 2
, 2A..., a plurality of linear elastic support members supporting the lens holder 2, 4 a focusing coil attached to the outer periphery of the lens holder 2, 5 a tracking coil, and 6 a tracking coil. Yoke part, F is permanent magnet, 8
Reference numeral 9 indicates a fixing member fixing the other ends of the linear elastic support members 3, 3, . The base 11, 11, to which the fixing member 8, printed circuit board 9, etc. are attached, is a stepped cylindrical body for relaying the connection between the linear elastic support members 3, 3... and the fixing member 8. The damper member 12 is an adhesive that fixes one end of the linear elastic support members 3, 3, . . . to the support pieces 2A, 2A, . . . of the lens holder 2.

In the objective lens support device of the optical pickup device constructed as described above, the conventional component structure is as shown in FIG. That is, FIG. 3 is an exploded perspective view of the main parts of the conventional objective lens support device, and in the figure, 2B, 2B
. . . are support holes provided in the support pieces 2A, 2A, . . . of the lens holder 2, 8Ap8A . These are a mounting hole and a positioning hole provided in the fixing member 8.

9A, 9B, . . . are positioning holes and mounting holes provided in the printed circuit board 9, and 69A for positioning is the fixing member 8.
It is provided opposite to the stepped hole 8A.

Reference numeral 10a denotes a mounting piece erected on one side of the base 10, and has a mounting hole 10B. Reference numeral 12 denotes a mounting screw that passes through the mounting hole 9B of the printed circuit board 9 and the mounting hole 8B of the fixing member 8 and is screwed into the screw hole 10B of the mounting piece 10A.

As is clear from Figure 3, the conventional component configuration is as follows:
Linear elastic support members 3, 3...damper members 11.11.
...The fixing members 8 are each constructed separately, and are connected using an adhesive or the like during assembly.

Next, the procedure for assembling the conventional objective lens support device having the above structure will be explained.

First, one end of each of the linear elastic support members 3, 3... is inserted into the damper member 11, 11..., and one end of the damper member 11, 11... is connected to the step of the fixing member 8. They are fitted into the attached holes gA, 5A, etc., and these three members are each fixed with an adhesive.

Next, support holes 2B are provided in the support pieces 2A, 2A, etc. of the lens holder 2 so that the distal ends of the linear elastic support members 3, 3, etc.
, 2B..., f1! Glue with material 12. As a result, the lens holder 2 has a plurality of linear elastic support members 3, 3.
It is supported almost horizontally by... Then, attaching piece 1
The positioning protrusion (not shown) provided at 0A, the positioning six 8C1 of the fixing member 8, and the stepped hole 9A of the fixing member 8
, $A... and the positioning holes 9A of the printed circuit board 9, and also align the mounting holes 8B of the fixing member 8 and the mounting holes 9B of the printed circuit board 9 with the base 10.
Fix it with the fixing screw 13 so that it matches the screw hole 10B provided in the mounting piece 10A.

[Problem to be solved by the invention]

The conventional device is constructed as described above, and when a drive signal in the resonance frequency band is applied, the linear elastic support members 3, 3
The amount of resonance of... becomes large and the servo characteristics worsen, so in order to suppress the amount of resonance, linear elastic support members 3, 3...
It was necessary to bring the damper members 11, 11, .

However, in the past, these two members were fixed with adhesive, which resulted in variations in the adhesion accuracy and a large amount of resonance.
This had a negative effect on servo characteristics. Furthermore, during assembly, adhesive is used in multiple locations, making assembly difficult and making highly accurate positioning extremely difficult. Furthermore, the number of parts was large, which was an obstacle to cost reduction.

This invention was made to solve the above-mentioned problems. It improves the adhesion between the damper member and the linear elastic support member to take damping, and also provides an inexpensive objective lens support device that is easy to assemble. The purpose is to obtain.

[Means for Solving 12 Problems] The objective lens support device according to the present invention includes a damper member that relays the coupling between the linear elastic support member and the fixing member, to a fixing member for fixing the linear elastic support member. is formed by integral molding, and a linear elastic support member is integrally joined to the damper member when molding the damper member.

[Effect]

In this invention, the damper member is integrally molded with the fixed member, and the linear elastic support member is integrally combined with the damper member during molding of the damper member, thereby improving the adhesion between the damper member and the elastic support member. In addition, the amount of resonance of the linear elastic support member in the high resonance frequency band can be reduced, the number of parts is reduced, the assembly process is simplified, and positioning is facilitated, so that assembly efficiency is also improved.

〔Example〕

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

FIG. 1 is an exploded perspective view of essential parts of an objective lens support device showing an embodiment of the present invention.

In the figure, the same reference numerals as in FIGS. 2 and 3 indicate the same or corresponding parts.

The damper members 11, 11, .
1. It is integrally fixed during molding.

Next, a procedure for assembling the objective lens support device of the present invention will be explained. First, 3 out of 3 linear elastic support members... One end is a damper member 1 integrally molded with the fixing member 8.
1.11..., so only the other ends of the linear elastic support members 3, 3... are formed in the support holes 2B of the support pieces 2A, 2A... of the lens holder 2. , 2B・
. . and bonded with an adhesive 12, and the lens holder 2 is supported by a plurality of linear elastic support members 3, 3, .

Thereafter, the fixing member 8 and the printed circuit board 9 are fixed to the paste 10 with the fixing screws 13 in the same manner as in the conventional method.

According to the configuration of the above embodiment, the linear elastic support member 3.3.
... and the damper members 11, 11... are bonded using adhesive 1.
Fixation by using 2 also has a large bonding force and good adhesion. Therefore, the amount of resonance of the linear elastic support members 3, 3, . . . in the resonance frequency band is reduced, and the servo characteristics are improved. In addition, the fixing member 8 and the damper members 11, 11,
The conventional bonding process with... is no longer necessary, the number of parts is reduced, ease of assembly is improved, and costs can be reduced.

〔Effect of the invention〕

As explained above, this invention integrally connects a linear elastic support member and a damper member during molding of the damper member,
Since the damper member is integrally molded with the fixed member, the ease of assembling the device is improved, and the number of parts can be reduced, resulting in cost reduction.

Furthermore, the adhesion between the damper member and the linear elastic support member is improved, the amount of resonance of the linear elastic support member in the resonance frequency band can be suppressed, and the servo characteristics are also improved.

[Brief explanation of the drawing]

FIG. 1 is an exploded perspective view of essential parts of an objective lens support device according to an embodiment of the present invention, FIG. 9 is an exploded perspective view of essential parts of the objective lens support device; 1 is an objective lens; 21. t lens holder, 3.3... is a linear elastic support member, 8 is a fixing member, 9 is a printed circuit board,
lQt: t pace, 11, 11... is a damper member. Note that the same reference numerals in the figures indicate the same or corresponding parts. Agent: Masuo Oiwa (2 others) -NfflO)

Claims (1)

[Claims] In order to optically read information recorded on a recording medium, a lens holder holding an objective lens is supported on a fixed member using a plurality of linear elastic support members, and the objective lens is supported at least in the direction of its optical axis. and an objective lens support device configured to be driven in a direction perpendicular thereto, wherein a damper member that relays the connection between the linear elastic support member and the fixing member is integrally formed on the fixing member, and the damper member is integrally formed with the fixing member. An objective lens support device characterized in that one end of the linear elastic support member is integrally joined during formation of the objective lens support device.