JPH05325221A - Suspension structure for two-axis actuator - Google Patents

Abstract

PURPOSE:To improve the work efficiency and to reduce the cost by automatizing the forming process of a suspension. CONSTITUTION:Each of a fulcrum side forming part 11 and a turning end side forming part 13 consists of two upper and lower members and an upper part 11u of the fulcrum side forming part 11, an upper part 13u of the turning end side forming part 13, and an upper link 12u of parallel links 12 are formed as upper parts 17 integrally by an inserting molding. The lower part 11d of the fulcrum side forming part 11, the lower part 13d of the turning end side forming part 13, and the lower link 12d of parallel links 12 are formed as lower parts integrally by the inserting molding. The upper part 11u of the fulcrum side forming part 11 of upper parts 17 and the lower part 11d of the fulcrum side forming part 11 of lower parts are welded, and the upper part 13u of the turning end side forming part 13 of upper parts 17 and the lower part 13d of the turning end side forming part 13 of lower parts 18 are welded.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a novel biaxial actuator suspension structure. Specifically, in a suspension structure of a biaxial actuator, it is intended to provide a new suspension structure of a biaxial actuator that can realize automation in a suspension forming process, improve work efficiency and reduce cost. ..

[0002]

2. Description of the Related Art In an optical pickup device, it is necessary to rotate an objective lens in a vertical direction (focusing direction) and a horizontal direction (tracking direction).

Therefore, a suspension is interposed between a lens holding member that holds the objective lens and a vertical wall of the base to support the lens holding member in the vertical and horizontal directions relative to the base. ..

10 to 12 schematically show a suspension a of a conventional biaxial actuator.

The suspension a is made of a fulcrum-side molded portion b fixed to a base (not shown) and a metal leaf spring material arranged at one end of the fulcrum-side molded portion b so as to extend in a substantially horizontal direction. A pair of parallel links c, c
And a rotary end side molding portion d fixed to the parallel links c and c so as to be bridged between the other ends thereof.

Reference numeral e denotes a lens holding member that holds the objective lens f, and the lens holding member e is supported by the suspension a via a turning end side molding portion d.

Although not shown, the lens holding member e has a focusing coil and a tracking coil attached thereto, and these coils are arranged in the magnetic field of the magnet and the yoke fixed to the base. hand,
By feeding power to the focusing coil or the tracking coil, the lens holding member is moved in the vertical direction (focusing direction) or the horizontal direction (tracking direction) with respect to the base.

The fulcrum-side molded part b of the suspension a is made of a synthetic resin material and is embedded in a state in which one ends of the parallel links c, c are vertically separated from each other, and are integrally formed with these.

The turning end side molding portion d is made of a synthetic resin material and is embedded in a state where the other ends of the parallel links c and c are vertically separated from each other, and is formed integrally with this.
A thin hinge portion g extending in the vertical direction is formed in the center portion thereof.

The parallel link c is made of a metal leaf spring material, and rectangular holes h, h, ... Are formed in the longitudinal direction thereof to reduce the spring constant.

However, the vertical movement of the lens holding member e is performed by bending the parallel links c and c in the vertical direction, and the horizontal movement thereof is performed by the rotary end side molding portion d. It is performed by rotating the thin hinge part g as a rotation axis.

[0012]

However, in the above-described conventional suspension structure of the biaxial actuator, the suspension a has two ends c of the links c and c made of a metal material. Since the resin molded parts b and d are formed so as to connect the parts to each other, there is a problem that the manufacturing cannot be automated, the production efficiency is poor, and the cost is increased.

That is, such a suspension a has 2
Since a part surrounded by one molding part b, d and two links c, c is formed, when manufacturing this by insert molding, the mold part located in the above-mentioned surrounded part is disassembled and die-cutting is performed. There was no choice but to do so, and the manufacturing process could not be automated, resulting in extremely poor workability.

[0014]

Therefore, in order to solve the above-mentioned problems, the suspension structure of the biaxial actuator of the present invention comprises a fulcrum-side molding portion and a rotating end-side molding portion, each of which is composed of two upper and lower members. , The upper part of the fulcrum-side molding part, the upper part of the pivot end-side molding part, and the upper link of the parallel links are integrally formed as an upper part by insert molding, and pivot with the lower part of the fulcrum-side molding part. The lower part of the end forming part and the lower link of the parallel links are integrally formed as a lower part by insert molding, and the upper part of the fulcrum forming part of the upper part and the fulcrum forming of the lower part are formed. And the lower part of the upper part of the rotary end side molding part of the upper part and the lower part of the rotary end side molding part of the lower part are bonded or welded separately.

[0015]

Therefore, according to the suspension structure of the biaxial actuator of the present invention, since the fulcrum-side molding portion and the rotating end-side molding portion are each composed of two members, the upper and lower portions, respectively. There is only one link provided between the rotary end side molding part and the upper part or the lower part of the rotary end side molding part. Therefore, the upper part or the lower part of the fulcrum side molding part and the upper part of the rotary end side molding part or The lower part and the upper link or the lower link of the parallel links can be manufactured by insert molding, there is no work that an operator must manually do, and the subsequent upper part and the lower part Since the step of connecting with the parts is also only adhesion or welding, automation is easy, automation of suspension manufacturing can be achieved as a whole, and production efficiency can be improved and cost can be reduced.

[0016]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The details of the suspension structure of the biaxial actuator of the present invention will be described below with reference to the respective embodiments shown in the accompanying drawings.

1 to 8 show a first embodiment in which the present invention is applied to a suspension structure of a biaxial actuator of an optical pickup device.

FIG. 1 shows an outline of a biaxial actuator 1 for performing focusing adjustment and tracking adjustment of an optical pickup device.

In the figure, 2 is a base of the optical pickup device.

Reference numeral 3 denotes a lens holding member, and the objective lens 4 is fixed to the lens holding member 3.

The lens holding member 3 is supported by the other end of the suspension 5 whose one end is supported by the base 2, and is made movable in the vertical direction (focusing direction) and the horizontal direction (tracking direction). There is.

Focusing coils 6 and 6 are wound in a rectangular shape when viewed from above and attached to both side surfaces of the lens holding member 3, and 7 and 7 are attached so as to overlap side surfaces of the focusing coils 6 and 6. It is a tracking coil attached.

Reference numerals 8 and 8 denote inner yokes fixed to the base 2 so as to sandwich the lens holding member 3 from both sides and inserted into the rectangular spaces of the focusing coils 6 and 6.
Reference numerals 9 and 9 denote outer yokes fixed to the base 2 so as to face the inner yokes 8 and 8 from the sides thereof.
Plate-shaped magnets 10 and 10 are fixed to the surface of the inner yoke 9 that faces the inner yokes 8 and 8.

When a driving current is supplied to the focusing coils 6 and 6, the lens holding member 3 bends the suspension 5 to rotate in the vertical direction, and the tracking coils 7 and 7 are supplied with the driving current. Then, the lens holding member 3 bends the suspension 5 and is rotated in the left-right direction.

The suspension 5 is composed of a fulcrum-side molded portion 11 fixed to the base 2 and upper and lower portions made of a metallic spring material, each end of which is supported by the fulcrum-side molded portion 11 and arranged so as to extend in a substantially horizontal direction. It is composed of a pair of parallel links 12 and a rotary end side molding portion 13 fixed to the other end of the parallel links 12.

The parallel link 12 is provided with an upper link 12u and a lower link 12d made of a metal leaf spring material, and rectangular holes 16, 16, ... To reduce the spring constant in the longitudinal direction. Are formed.

The fulcrum-side molded portion 11 of the suspension 5 is made of a synthetic resin material and is composed of two upper and lower portions 11u and 11d. The upper portion 11u and the lower portion 11d are formed substantially vertically symmetrically and will be described later. Are molded in separate molds.

The base ends of the upper link 12u and the lower link 12d of the parallel link 12 are the fulcrum-side molding portions 11 at their base ends.
The upper part 11u and the lower part 11d are separately embedded and molded integrally as described later.

The rotating end side molding portion 13 of the suspension 5 is made of a synthetic resin material, and has two upper and lower portions 13u and 13d.
The upper part 13u and the lower part 13d
Are formed substantially vertically symmetrical with each other and are molded by separate molds as described later.

The tip ends of the upper link 12u and the lower link 12d of the parallel link 12 are the rotary end side molding portion 1 described above.
The upper part 13u and the lower part 13d of No. 3 are separately embedded and molded integrally as described later.

The upper portion 13 of the rotary end side molding portion 13
u and the lower portion 13d are formed with thin hinge portions 14u, 14d extending in the vertical direction at their central portions, and the thin hinge portions 14u, 14d are formed with notches 15u, 15d opening downward or upward, respectively. Has been done.

And, such a suspension 5 is
The upper portion 11u of the fulcrum-side molding portion 11 and the rotating end-side molding portion 1
3, an upper part 17 composed of an upper part 13u and an upper link 12u, a lower part 11d of the fulcrum-side molding part 11, a lower part 13d of the rotary end-side molding part 13 and a lower link 12d. The component 18 and the upper portion 1u of the fulcrum-side molding portion 11 and the lower portion 11d of the fulcrum-side molding portion 11 are formed separately.
It is molded by welding 3u and the lower part 13d.

In order to mold the upper part 17, first, separate molds 19 and 20 for molding the upper part 11u of the fulcrum-side molding part 11 and the upper part 13u of the rotary end-side molding part 13 are formed.
Are appropriately separated from each other, and then the upper link 12 is press-molded in advance in the insert insertion notches 19a and 20a formed in the upper portions of the side walls of the molds 19 and 20 facing each other.
Both ends of u are separately inserted in a direction in which the upper link 12u is horizontal (see FIG. 5), and molten resin is injected into each of the molds 19 and 20 (see FIG. 6).

In this way, the upper part 17 is formed by insert-molding both ends of the upper link 12u on the upper part 11u of the fulcrum-side molding part 11 and the upper part 13u of the rotating end-side molding part 13 (Fig. 7).

Similarly to the upper part 17, the lower part 18 is insert-molded into the lower part 11d of the fulcrum-side molding part 11 and the lower part 13d of the rotary end-side molding part 13 at both ends of the lower link 12d. Formed.

Next, the upper portion 11u and the lower portion 11d of the fulcrum-side molding portion 11 formed in this way, and the upper portion 13u and the lower portion 13d of the rotary end-side molding portion 13 are divided into two parts. The two links 12u and 12d are welded so as to be parallel to each other, whereby the suspension 5 is formed (see FIG. 8).

In connecting the upper part 17 and the lower part 18, the notch 15u formed in the upper end 13u and the lower part 13d of the rotary end side molding 13 by joining them.
15d and 15d have their openings combined, and a vertically long rectangular hole 15 is formed therein, and the rectangular hole 15 functions as a hole for reducing the spring constant of the hinge portion 14.

In the suspension 5 thus formed, the fulcrum-side molding portion 11 is fixed to the base by adhesion or the like, and the lens holding member 3 is attached to the tip of the rotating end-side molding portion 13. Be worn.

Therefore, the lens holding member 3 is moved in the vertical direction by bending the parallel link 12 in the vertical direction, and the movement in the horizontal direction is performed by the rotary end side molding portion 1.
This is performed by rotating the thin hinge portion 14 of No. 3 as the rotation axis.

Although not shown, the fulcrum-side molding portion 11
When the upper part 11u and the lower part 11d are joined, and when the upper part 13u and the lower part 13d of the rotary end side molding portion 13 are joined, a concave portion and a convex portion are separately formed on these joint surfaces. It is possible to easily perform alignment in joining the two.

FIG. 9 shows a second embodiment in which the suspension structure of the biaxial actuator of the present invention is applied to the suspension structure of the biaxial actuator of the optical pickup device.

The suspension 5A shown in the second embodiment is different from the suspension 5 shown in the first embodiment in that the hinge portion for tracking adjustment is provided on the rotary fulcrum side molding portion. Since the second embodiment is not integrally formed, the description of the second embodiment will be made mainly on the differences from the first embodiment, and the other parts will be described in the first embodiment.
The same reference numerals as those given to the same parts in the embodiment are given to omit the explanation.

Reference numeral 21 is a rotary end side molding portion which is integrally formed at the tip portion of the parallel link 12 and comprises an upper portion 21u and a lower portion 21d.

Rectangular cutouts 22u and 22d are formed in the upper portion 21u and the lower portion 21d so as to open downward or upward.

The upper end portion 21u of the rotary end side molding portion 21 as well as the upper end portion 11u and the upper portion 11u of the fulcrum side molding portion 11 is similar to the rotary end side molding portion 13 in the first embodiment. The upper part 17 is formed integrally with the link 12u, and the lower part 21d is integrally formed with the lower part 11d of the fulcrum-side forming part 11 and the lower link 12d to form the lower part 18. To do.

When the upper part 17 and the lower part 18 are joined together, the rectangular hole 22 is formed by the notches 22u and 22d respectively formed in the upper part 21u and the lower part 21d of the rotary end side molding portion 21. Is formed.

Reference numeral 23 denotes a hinge, which has a substantially rectangular plate-shaped base portion 24, an attached portion 25 having substantially the same shape as the base portion 24, and both end portions integrally embedded in the base portion 24 and the attached portion 25. It is composed of a plate spring portion 26 in the form of a metal plate.

The opposite leaf spring portion 26 of the base portion 24 of the hinge tool 23
A convex portion 24a is formed on the side surface, and the convex portion 24a is formed.
Is substantially the same as or slightly smaller than the rectangular hole 22 of the rotary end side molding portion 21.

The convex portion 24a of the base portion 24 of the hinge tool 23 is internally fitted into the rectangular hole 22 of the rotary end side molding portion 21 so that the leaf spring portion 26 is oriented in the vertical direction, and this is the rotary end side. By being welded to the molding portion 21, the hinge tool 23 is integrally fixed to the rotating end side molding portion 21.

The lens holding member 3 is attached to the attached portion 25 of the hinge tool 23.

Therefore, the vertical movement of the lens holding member 3 is performed by bending the parallel link 12 in the vertical direction, and the horizontal movement thereof is performed by the rotary end side molding portion 2.
This is performed by bending the leaf spring portion 26 of the hinge tool 23 attached to the distal end of 1 in the left-right direction.

[0052]

As is clear from the above description, in the suspension structure of the biaxial actuator of the present invention, the fulcrum side molding portion made of a synthetic resin material and supported on the base of the biaxial actuator and the fulcrum side A pair of upper and lower parallel links made of metal leaf springs, each of which has a base end supported by the forming part and arranged in a substantially horizontal posture, and a synthetic resin material, are provided so as to bridge between the tips of the parallel links. A suspension structure of a biaxial actuator having a rotating end side molding portion fixed to the fulcrum side, wherein the fulcrum side molding portion and the rotating end side molding portion are respectively composed of upper and lower members.
The upper part of the fulcrum-side forming part, the upper part of the rotating end-side forming part, and the upper link of the parallel links are integrally formed as an upper part by insert molding, and rotate with the lower part of the fulcrum-side forming part. The lower part of the end side molding part and the lower link of the parallel links are integrally formed as a lower part by insert molding, and the upper part of the fulcrum side molding part of the upper part and the fulcrum side of the lower part are formed. The lower part of the molding part,
It is characterized in that the upper part of the rotary end side molding part of the upper part and the lower part of the rotary end side molding part of the lower part are bonded or welded separately.

Therefore, according to the suspension structure of the biaxial actuator of the present invention, since the fulcrum-side molding portion and the rotating end-side molding portion are composed of the upper and lower members, respectively, the upper portion or the lower portion of the fulcrum-side molding portion is formed. There is only one link provided between the rotary end side molding part and the upper part or the lower part of the rotary end side molding part. Therefore, the upper part or the lower part of the fulcrum side molding part and the upper part of the rotary end side molding part or The lower part and the upper link or the lower link of the parallel links can be manufactured by insert molding, there is no work that an operator must manually do, and the subsequent upper part and the lower part Since the step of connecting with the parts is also only adhesion or welding, automation is easy, automation of suspension manufacturing can be achieved as a whole, and production efficiency can be improved and cost can be reduced.

It should be noted that the specific shapes and structures shown in the above embodiments are merely examples of the implementation in implementing the suspension structure of the biaxial actuator of the present invention, and the technical features of the present invention are realized by these. The scope should not be construed as limiting.

[Brief description of drawings]

FIG. 1 is a perspective view of the entire first embodiment in which a suspension structure of a biaxial actuator according to the present invention is applied to an optical pickup device together with FIGS. 2 to 8. FIG.

FIG. 2 is a perspective view of a suspension.

FIG. 3 is a plan view of a suspension.

FIG. 4 is a side view of the suspension.

FIG. 5 is a cross-sectional view schematically showing a step of forming the suspension together with FIGS. 6 to 8 and showing a state where both ends of the link are inserted into two molds.

FIG. 6 is a sectional view schematically showing a state where molten resin is supplied to two molds.

FIG. 7 is a cross-sectional view schematically showing a state in which an upper part is taken out from the mold.

FIG. 8 is a cross-sectional view schematically showing a state immediately before joining the upper component and the lower component.

FIG. 9 is an exploded perspective view showing a second embodiment in which the suspension structure of the biaxial actuator of the present invention is applied to an optical pickup device.

FIG. 10 is a perspective view schematically showing an example of a conventional suspension structure of a biaxial actuator.

FIG. 11 is a plan view showing an example of a conventional suspension.

FIG. 12 is a side view showing an example of a conventional suspension.

[Explanation of symbols]

 1 2 axis actuator 2 base 5 suspension 11 fulcrum side molding part 11u upper part 11d lower part 12 parallel link 12u upper link 12d lower link 13 turning end side molding part 13u upper part 13d lower part 17 upper part 18 Lower part 5A Suspension 21 Rotating end side molding part 21u Upper part 21d Lower part

Claims (1)

[Claims] 1. A fulcrum-side molding part made of a synthetic resin material and supported on a base of a biaxial actuator, and a metal plate having its base ends supported by the fulcrum-side molding part and arranged in a substantially horizontal posture. A suspension structure of a biaxial actuator comprising a pair of upper and lower parallel links made of a spring material and a rotary end side molding portion fixed to the parallel links made of a synthetic resin material so as to bridge between the tips of the parallel links. The fulcrum-side molding portion and the rotary end-side molding portion are composed of upper and lower members, respectively. The upper portion of the fulcrum-side molding portion, the upper portion of the rotary-end-side molding portion, and the upper link of the parallel links. Is integrally formed as an upper part by insert molding, and the lower part of the fulcrum-side molded part, the lower part of the rotary end-side molded part, and the lower link of the parallel links are used as a lower part by insert molding. On earth The upper part of the fulcrum-side forming part of the upper part and the lower part of the fulcrum-side forming part of the lower part, and the upper part of the rotating end-side forming part of the upper part and the lower part of the lower part. A suspension structure for a biaxial actuator, characterized in that a lower portion of a rotary end side molding portion is separately bonded or welded.