JPH0714187A - Lend holding suspension for optical pickup - Google Patents

Abstract

PURPOSE:To provide a lens holding suspension capable of accurately and easily positioning wires. CONSTITUTION:Both ends of two parallel wires 13 constituting the suspension 1 are positioned and fixed to fixing members 11 and 12 respectively in advance, and they are fitted between a lens holder 3 and a main body 4 of the optical pickup 10. The suspension 1 is so constituted as to be processed separately in advance thatn only high precision parts may be assembled after confirming the prallelism of the two wires 13 and the accuracy in length in advance.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention is applicable to, for example, CDs, LDs and Ms.
The present invention relates to a configuration of a lens holding suspension of an optical pickup used in an optical disk device such as an O or MD or a magneto-optical disk device.

[0002]

2. Description of the Related Art FIG. 6 is a plan view of an example of a conventional lens holding suspension of an optical pickup, and FIG. 7 is a front view of the same.

In a conventional lens holding suspension, a lens holder 202 is supported by using four wires 201, which are parallel to a base 200, respectively.
The objective lens 203 is attached to the center of the lens holder 02, and the yokes 205 to which the magnets 204 are attached are arranged on the right and left sides of the lens holder 202 respectively.
The focusing coil 206 and the tracking coil 207 wound around the outer periphery are faced to each other, and the focusing coil 2
By energizing 06, the lens holder 202 is moved in the optical axis direction, and by energizing the tracking coil 207, the lens holder 202 is moved in the direction orthogonal to the optical axis for adjustment.

As described above, conventionally, the suspension is composed of four wires 201 or leaf springs (not shown).

FIG. 8 is a front view of an example of the suspension. This suspension is mounted on the lens holder side mounting member 2
A printed circuit board 211 is attached to 10 and a through hole 212 is provided to penetrate both. And
The through hole 212 is formed in a substantially conical shape to facilitate the passage of the wire 201. Then, the wire 201 was passed through the through hole 212, and the protruding portion of the wire 201 was soldered 213 to the printed board 211. Further, the damper agent 214 was filled in the gap between the through hole 212 and the wire 201.

On the other hand, the other end of the wire 201 was embedded in the main body 200 and soldered 215.

[0007]

However, in order to read the media disc signal detected by the optical pickup, the holding and positioning accuracy of the objective lens is high. For example, in the 4-wire system, the wire 4 having a diameter of about 0.1 mm is used. It is necessary to precisely position the books with an expensive precision jig or the like, and separately bond or solder the lenses one by one to the lens holder and the main body. Therefore, not only a great number of manufacturing steps are required, but also in terms of accuracy, for example, in the parallel link method, the degree of symmetry and the like are not sufficient and there is a problem in performance.

Further, since the diameter of the outlet 212a of the through hole 212 requires some play in order to pass the wire 201 through, it is not possible to perform accurate dimensioning. This dimensional accuracy is required to be about 10 μmm.

Further, when the wire 201 is soldered 215 to the main body 200, the solder 216 may flow out to the wire 201 and the elasticity of the wire 201 may be reduced.

Therefore, an object of the present invention is to provide a suspension for holding a lens of an optical pickup, in which the positioning of the wire can be accurately and easily carried out, and there is no risk of solder flowing out to the wire.

[0011]

In order to solve the above-mentioned problems, the present invention is characterized in that a lens-holding suspension is constituted by positioning and fixing a plurality of wires as one set.

[0012]

Since the suspension is composed of a plurality of wires which are positioned and fixed as one set, the wires can be positioned accurately and easily, and since soldering is eliminated, solder may flow out to the wires. You can get rid of it.

[0013]

Embodiments of the present invention will be described below with reference to the accompanying drawings. FIG. 1 is an external view of an essential part of an optical pickup provided with a lens holding suspension according to the present invention. Since the magnet and the yoke have the same structure as the conventional example, their illustration is omitted.

This figure shows a state before a pair of wires (suspension wire) is attached between the lens holder and the main body. In this embodiment, the wire is composed of two wires, but it is also possible to use three wires or more.

The lens holding suspension 1 is mounted between a lens holder 3 (having a function as a coil bobbin) provided with an objective lens 2 and a main body 4. Further, the focusing coil 5 and the tracking coil 6 are wound around the outer peripheral surface of the lens holder 3 as in the conventional example.
By energizing these coils 5 and 6, it is possible to move the lens holder 3 in the optical axis direction or the direction orthogonal thereto. The body 4 is fixed on a base 7. With these members 1 to 7, the optical pickup 1
0 is configured.

FIG. 2 shows a first lens holding suspension.
It is an external view of an Example. Lens holding suspension 1
Is composed of fixing members 11 and 12 formed of resin or the like, and two wires 13 having a circular, elliptical or rectangular cross section.

The two wires 13 are arranged substantially parallel to each other, and both ends thereof are accurately positioned and fixed to the fixing members 11 and 12 by insert molding or ultrasonic welding to be unitized.

The fixing member 12 has recesses 12a, 1a.
2b is formed, and the wire 13 is damped by the damper agent filled therein.

In this way, in the suspension 1 which is manufactured as a unit, the fixing member 11 is the lens holder 3
The fixing members 12 are fixed to the side surfaces of the main body 4, respectively, on the convex mounting portions 3a provided on the upper and lower two side surfaces.

The suspensions 1 are provided in pairs on both sides of the lens holder 3 and the body 4. Therefore, the lens holder 3 has four wires (links) 13
When the coils 5 and 6 are energized, the lens holder provided with the objective lens 2 is caused by the action of a magnet (not shown) attached to the base 7 (Fleming's left-hand rule). 3 moves in the direction of the optical axis and in a direction orthogonal to the direction of the optical axis, and focusing and tracking are controlled.

As described above, since the lens holding suspension 1 is attached to the lens holder 3 and the main body 4 as a unit in which two wires 13 are positioned and fixed as one set, the parallelism of the two wires 13 is After checking the length accuracy in advance, only high-precision products can be assembled.

Further, for example, if the mounting portions of the fixing member 11 and the lens holder 3 are fitted to each other (not shown), the relative positional accuracy between the lens holder 3 and the main body 4 is ensured. There is no need for an expensive high-precision jig and the number of assembling steps can be reduced, so that the equipment cost and the manufacturing cost can be reduced.

FIG. 3 shows a second lens holding suspension.
It is an external view of an Example. Lens holding suspension 2
In order to fix the position of the wire 21, 0 is a protrusion 21 by a kink or a boss on both ends of the wire 21.
a is formed to have a mechanical anchoring effect.
Then, the wire 21 is inserted into the fixing members 22 and 23 until the protrusion 21a of the wire 21 is embedded,
After that, the protrusion 21a and the fixing members 22 and 23 are fixed with an adhesive or the like. According to this structure, the wire 21 can be more firmly fixed to the fixing members 22 and 23.

Further, in both the first and second embodiments, the wire 13,
Since soldering was not used to attach 21 to the fixing members 11, 12, 22, and 23, there is no fear that solder will flow out to the wire.

FIG. 4 shows a third lens holding suspension.
It is an external view of an Example. Lens holding suspension 3
0 is a metal fixing member 3 on both ends of the two wires 31.
It is welded to 2, 33. Then, the fixing member 32 was attached to the lens holder 3, and the fixing member 33 was attached to the main body 4. According to this configuration, it is not necessary to perforate the fixing members 32 and 33 and to form protrusions at both ends of the wire 31, so that the number of steps can be reduced.

FIG. 5 shows a fourth lens holding suspension.
It is an external view of an Example. Lens holding suspension 4
No. 0 is obtained by bending one wire 41 into a U-shape. Then, the left two open end portions 41a of the wire 41 are fixed to the lens holder 3, and the right bent portion 41b is fixed to the main body 4. According to this structure, the parallelism of the wire 41 can be ensured relatively easily without using a fixing member, so that the cost can be reduced and the workability can be improved.

[0027]

Since the suspension is formed by positioning and fixing a plurality of wires as one set, the wires can be accurately and easily positioned, and since soldering is eliminated, the solder flows out to the wires. It can be done without fear. Therefore, it is possible to reduce costs and improve workability.

[Brief description of drawings]

FIG. 1 is an external view of a main part of an actuator provided with a lens holding suspension according to the present invention.

FIG. 2 is an external view of a first embodiment of a lens holding suspension according to the present invention.

FIG. 3 is an external view of a second embodiment of a lens holding suspension according to the present invention.

FIG. 4 is an external view of a third embodiment of a lens holding suspension according to the present invention.

FIG. 5 is an external view of a fourth embodiment of a lens holding suspension according to the present invention.

FIG. 6 is a plan view of an example of a suspension for holding a lens of a conventional optical pickup.

FIG. 7 is a front view of an example of a conventional lens holding suspension of an optical pickup.

FIG. 8 is a front view of another example of a conventional lens holding suspension of an optical pickup.

[Explanation of symbols]

1, 20, 30, 40 ... Lens holding suspension,
2 ... Objective lens, 3 ... Lens holder, 4 ... Main body, 10 ...
Optical pickup, 11, 12, 22, 23, 32, 33
... fixing member, 13, 21, 31, 41 ... wire.

Claims (1)

[Claims] 1. A lens holding suspension mounted between a lens holder of an optical pickup and a main body, wherein the suspension is configured by positioning and fixing a plurality of wires as one set. suspension.