JPH10172160A - Method for assembling objective lens driving device and member for vibration system part - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the deformation of a wire (supporting member) for connecting, among vibration system parts, a lens holder and a supporting member holder together, when an objective lens driving device is assembled to be used for an optical disk recording/reproducing device. SOLUTION: This device comprises a lens holder 2 having a lens holder positioning part 2a, a supporting member holder 6 having a connecting part 6a for connecting fixed parts, a wire 11 for connecting the lens holder 2 and the supporting member holder 6 together and an outer frame 12 surrounding at least one of the lens holder 2 and the supporting member holder 6 and having an outer frame positioning part 12a. In this case, the outer frame 12 is assembled to prevent the deformation of the wire 11 by utilizing a vibration system part member connected to the lens holder 2 or the supporting member holder 6 via a thin part 12b.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] 1. Field of the Invention [0002] The present invention relates to an objective lens driving device which constitutes a part of an optical pickup for projecting a light spot on a disk to perform recording and reproduction.

[0002]

2. Description of the Related Art An example of a conventional objective lens driving device will be described below with reference to the drawings. FIG. 6 is a perspective view showing a configuration at the time of assembling a vibration system component which is a part of a conventional objective lens driving device. The lens holder 22 and the four wires 31 each having one end inserted into the lens holder 22 and the wire holder 26 each having the other end of the wire 31 inserted therein are integrally formed by insert resin molding, When viewed from the wire holder 26, the lens holder 22 is in a cantilevered state. At the time of assembly, the round pin 33a of the component assembling jig 33 is inserted into the round hole 22a of the lens holder 22.
By inserting the concave portion 26a of the wire holder 26 into the receiving boss 33b of the component assembling jig 33,
The lens holder 22 is positioned and fixed, and the objective lens 21 and the magnet 23 are bonded and fixed to the lens holder 22. Thus, the vibration system component 24 of the objective lens driving device is completed. FIG. 7 is a perspective view showing a configuration of the conventional objective lens driving device at the time of assembly. A focus coil 2 is attached to a bobbin 28 in which a yoke 27 is molded by insert resin
9 and a tracking coil 30 are wound thereon, and the two bobbins 28 are fixedly held to a base 25. The focus coil 29 is wound so that the central axis is parallel to the optical axis of the objective lens 21, and when a current flows through the focus coil 29, the lens holder 22 moves in the optical axis direction (focus direction:
(Z direction in the figure). The tracking coil 30 is wound so that the central axis is perpendicular to the optical axis.
When a current flows through this, the lens holder 22 moves in a direction perpendicular to the optical axis (tracking direction: Y direction in the figure). As described above, the objective lens driving device drives the objective lens 21 two-dimensionally in the optical axis direction and in the direction perpendicular to the optical axis by passing a current through the focus coil 29 and the tracking coil 30. The positioning boss 34a obtained by cutting the cylindrical side surface of the assembly jig 34 by a plane
The base 25 is positioned and fixed by entering the fifth fitting hole 25a.

The bobbin 2 having the wire holder 26 and the lens holder portion of the vibration system component 24
8, the vibration system component 24 is positioned with respect to the base 25 so that the receiving boss 25b of the base 25 and the wire holder 26 come into contact with each other. The objective lens driving device is completed by fixing the receiving boss 25b. FIG. 8 shows the completed objective lens driving device.

[0004]

In this objective lens driving device, the lens holder 22 is cantilevered by a support member 31 and a support member holder 26, and these are integrally formed by insert resin molding. In order to obtain a predetermined vibration frequency, the supporting member 31 has a diameter of about 100 μm when the metal wire 31 is used, and a thickness of about 40 μm in the case of a metal leaf spring. Is very weak.
By the way, in assembling the objective lens driving device, in order to secure the initial inclination of the lens holder 22 and to prevent unnecessary resonance from occurring, special care must be taken for the deformation of the support member 31.

[0005] However, in the conventional assembly of parts, when the objective lens 21 and the magnet 23 are first adhered and fixed to the lens holder 22, the lens holder 22 having the support member 31 inserted therein is directly held on a part assembling jig. The mounting must be performed, and the support member 31 may be deformed during the operation, and the workability is poor.

When the vibration system component is docked with the base 25 on which the bobbin 28 is mounted, the user holds the wire holder 26 to bring the wire holder 26 to a predetermined position. A gap of about 0.3 mm, which is a magnetic gap, must be inserted between the two bobbins 28.
May be deformed, which also makes workability very poor.

As described above, in assembling the objective lens driving device, there is a serious problem that the supporting member having a low strength is deformed.

An object of the present invention is to provide an assembling method of an objective lens driving device which does not cause a change in a supporting member which is weak in strength, in consideration of such a problem of the conventional method of assembling the objective lens driving device. It was done.

[0009]

SUMMARY OF THE INVENTION The present invention provides a lens holder 2 having a lens holder positioning portion 2a, a support member holder 6 having a fixed component connection connecting portion 6a, the lens holder 2 and the support member holder 6. And an outer frame positioning portion 12 surrounding at least one of the lens holder 2 and the support member holder 6.
and an outer frame 12 having an a. The outer frame 12 is connected to the lens holder 2 or the support member holder 6 by a thin portion 12b, and is a member for a vibration system component of an objective lens driving device. .

The lens holder 2 and the supporting member 1
1, the support member holder 6 and the outer frame 12 may be integrally formed.

Further, according to the present invention, the vibration system component member is provided by a first jig-side positioning part corresponding to the outer frame positioning part 12a and a second jig corresponding to the lens holder positioning part 2a. Each of the first component assembling jigs having the side positioning portions is mounted while being positioned using each of the positioning portions, and then the objective lens is attached to the lens holder 2, and then the first component assembling jig is mounted. The components are separated to complete the vibration system component. On the other hand, the fixed component having the winding coil, the connecting portion 5b of the vibration system component to the support member holder, and the fixed component positioning portion 5a is attached to the fixed component positioning portion 5a. Corresponding third jig-side positioning portion 14a
And positioning using the third jig-side positioning portion 14a on the second component assembling jig 14 having the fourth jig-side positioning portion 14b corresponding to the outer frame positioning portion 12a. And mounting the vibration system component on the second component assembling jig 14 while positioning using the fourth jig-side positioning portion 14b.
Thereby, the vibration system component and the fixed component are positioned with each other, and the connection portion 6a for connecting the fixed component of the vibration system component and the connection portion 5b of the fixed component are connected and fixed, and then the second component assembly is performed. A method of assembling an objective lens driving device, comprising separating a jig and finally cutting a thin portion 12b of the outer frame 12.

Further, the outer frame positioning portion 1 of the outer frame is provided.
Reference numeral 2a denotes an assembling method of the objective lens driving device, which has a hole shape, a pin shape or a concave shape.

Next, the operation of the present invention will be specifically described.
In addition to the lens holder, support member, and support member holder that are integrally molded with insert resin, the same integrally molded outer frame that surrounds at least one of the lens holder and the support member holder is provided, and a positioning shape is formed on the outer frame. By doing so, at the time of assembling the objective lens driving device, it is possible to almost avoid the problem that the supporting member having a weak strength is deformed during handling. First, when attaching the vibration system component including the support member to the assembly jig by providing the outer frame on the vibration system component, hold the outer frame without holding the lens holder or support member holder where the support member is directly inserted. You can work safely. Also, when the objective lens and magnet are bonded and fixed to the lens holder, in order to fix the lens holder, the round hole of the lens holder and the round pin of the jig are fitted, and the concave shape of the wire holder and the receiving boss of the jig are fitted. It is necessary to perform the positioning and fixing in the above, but at the time of fitting, there is a possibility that an external force is applied to the support member to deform the support member. However, by providing a positioning shape on the outer frame and positioning the assembling jig before the lens holder is fitted to the jig (the fitting between the lens holder and the jig is unnecessary), an excessive force is applied to the support member. However, the lens holder can be fixed at a predetermined position.

Further, when the vibration system parts are docked with the bobbin-mounted base attached to the assembling jig, the lens holder interferes with the bobbin by positioning the assembling jig first with the positioning shape of the outer frame. The base can be docked without vibration components and the base can be docked without contact with the base boss. It can be carried out.

[0015]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to FIGS.

(Embodiment 1) FIG. 1 is a perspective view showing a structure at the time of assembling a vibration system component which is a part of an objective lens driving device according to a first embodiment of the present invention. A lens holder 2 and four wires 11 each having one end inserted into the lens holder 2 and the wire 1
1, a wire holder 6 having the other end inserted and held, the lens holder 2 and the wire 11
And an outer frame 12 connected to the wire holder 6 by a thin portion 12b is integrally formed.

At the time of assembling, first, the 4
The protruded round pin 13a of the component assembling jig 13 is inserted into the round hole 12a at the location, and the position of the outer frame portion of the integrally molded product is determined. Next, the round pin 13b of the component assembling jig 13 is inserted into the opening 2a of the lens holder 2 whose position is substantially determined by the outer frame, and the lens holder 2 is positioned and fixed. Then, the objective lens 1 and the magnet 3 as mounting parts are adhered and fixed to the lens holder 2 fixed and positioned, and the vibration system part 4 including the outer frame 12 is completed.

FIG. 2 is a perspective view showing the structure of the objective lens driving device at the time of assembly according to the first embodiment of the present invention. A focus coil 9 and a tracking coil 10 are wound around a bobbin 8 in which a yoke 7 is formed by insert resin molding, and the two bobbins 8 are fixedly held to a base 5. The focus coil 9 is wound so that the central axis is parallel to the optical axis of the objective lens 1. When a current flows through the focus coil 9, the lens holder 2 moves in the optical axis direction (focus direction: Z direction in the figure). I do. The tracking coil 10 is wound so that the central axis is perpendicular to the optical axis. When a current flows through the tracking coil 10, the lens holder 22 moves in a direction perpendicular to the optical axis (tracking direction: Y direction in the drawing). I do. As described above, the objective lens driving device drives the objective lens 1 two-dimensionally in the optical axis direction and in the direction perpendicular to the optical axis by passing a current through the focus coil 9 and the tracking coil 10.

After the vibration system component 14 is completed as described above, the procedure for assembling the objective lens driving device will be described. Positioning boss 1 with cylindrical side surface of assembly jig 14 cut in a plane
When the base 4a enters the fitting hole 5a of the base 5, the base 5 is positioned and fixed. The four protruding round pins 14b of the assembling jig 14 are slightly smaller in diameter than the round holes 12a of the outer frame 12, and the positional relationship is within a play range with the round holes 12a of the outer frame when the outer frame 12 is inserted. The lens holder portion of the vibration system component 4 is inserted without interference between the two bobbins 8, and the wire holder 6 and the receiving boss 5b of the base 5 are set so as to contact only when the backlash is offset. I have.

Next, when assembling the vibration system component 4 including the outer frame 12 assembled earlier, the outer frame 12 is held, and four round holes 12a of the outer frame 12 are respectively inserted into the round pins 14b of the assembly jig. Thereby, the vibration system component 4 can be positioned and assembled to the base 5, the receiving boss 5 b of the base 5 and the wire holder 6 are fixed by the screw 13, and finally, the thin portion 12 b of the outer frame 12 is cut off and The frame 12 is removed. Thus, the objective lens driving device is completed.
FIG. 3 shows the completed objective lens driving device.

(Embodiment 2) FIG. 4 is a perspective view showing an assembly of a vibration system part which is a part of an objective lens driving device according to a second embodiment of the present invention. The only difference from the first embodiment is that the shape for positioning the outer frame 12 during assembly is a round pin 12c, and the receiving shape of the component assembly jig 13 on the receiving side is a round hole 13c. It is.
When the round pin 12c enters the round hole 13c, the vibration system component is positioned and fixed. In the assembly of the objective lens driving device after the assembly of the vibration system components, the positional relationship and the play setting for the positioning and fixing of the assembly jig and the outer frame 12 are performed in the same manner as in the first embodiment.

(Embodiment 3) FIG. 5 is a perspective view showing a vibration system component which is a part of an objective lens driving device according to a third embodiment of the present invention when assembled. The only difference from the first embodiment is that the shape for positioning the outer frame 12 during assembly is a concave shape 12d, and the shape of the receiving part assembly jig 13 is a round pin 13d. is there. When the concave shape 12d enters the round pin 13d, the vibration system component is positioned and fixed. In the assembly of the objective lens driving device after the assembly of the vibration system components, the positional relationship and the play setting for the positioning and fixing of the assembly jig and the outer frame 12 are performed in the same manner as in the first embodiment.

[0023]

As described above, according to the present invention, the assembling of the objective lens driving device can be performed with a very simple structure.
Without paying attention to the deformation of the weak support member,
A remarkable effect that an objective lens driving device with good productivity can be realized is obtained.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a configuration at the time of assembling a vibration system component which is a part of an objective lens driving device according to a first embodiment of the present invention.

FIG. 2 is a perspective view showing a configuration at the time of assembling the objective lens driving device according to the first embodiment of the present invention;

FIG. 3 is a perspective view showing an objective lens driving device according to the first embodiment of the present invention.

FIG. 4 is a perspective view showing a configuration when assembling a vibration system component which is a part of an objective lens driving device according to a second embodiment of the present invention;

FIG. 5 is a perspective view showing a configuration at the time of assembling a vibration system component which is a part of an objective lens driving device according to a third embodiment of the present invention; FIG.

FIG. 6 is a perspective view showing a configuration at the time of assembling a vibration system component which is a part of a conventional objective lens driving device.

FIG. 7 is a perspective view showing a configuration at the time of assembling a conventional objective lens driving device.

FIG. 8 is a perspective view showing a conventional objective lens driving device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Objective lens 2 Lens holder 2a Round hole 3 Magnet 4 Vibration system component 5 Base 5a Fitting hole 5b Receiving boss 6 Wire holder 7 Yoke 8 Bobbin 9 Focus coil 10 Tracking coil 11 Wire 12 Outer frame 13 Parts assembly jig 13a Round pin 13b Round pin 14 Assembly jig 14a Positioning boss 14b Round pin

Claims (6)

[Claims] 1. A lens holder having a lens holder positioning portion, a supporting member holder having a fixed component connecting portion, a supporting member connecting the lens holder and the supporting member holder, and the lens holder or the supporting member holder. And an outer frame having an outer frame positioning portion, wherein the outer frame is connected to the lens holder or the support member holder with a thin portion. Parts. 2. The vibration system component of an objective lens driving device according to claim 1, wherein the lens holder, the support member, the support member holder, and the outer frame are integrally formed. Element. 3. The vibration system component member according to claim 1, wherein a first jig-side positioning portion corresponding to the outer frame positioning portion and a second jig-side positioning portion corresponding to the lens holder positioning portion.
Are mounted on the first component assembling jig having the jig-side positioning portion by using the positioning portion, and then the objective lens is attached to the lens holder, and then the first component is mounted. The vibration jig is completed by separating the assembling jig. On the other hand, a fixed part having a winding coil, a connection part of the vibration part to the support member holder and a fixed part positioning part corresponds to the fixed part positioning part. The third jig-side positioning section is placed on the second component assembly jig having the third jig-side positioning section and a fourth jig-side positioning section corresponding to the outer frame positioning section. The vibration system component is mounted on the second component assembling jig while being positioned using the fourth jig-side positioning portion, whereby the vibration system component is mounted on the second component assembling jig. Vibration system And the positioning of the fixed components, the connecting portion for connecting the fixed components of the vibration system component and the connecting portion of the fixed components are connected and fixed, and then the second component assembling jig is separated. A method for assembling an objective lens driving device, comprising cutting a thin portion of the outer frame. 4. The method according to claim 3, wherein the outer frame positioning portion of the outer frame has a hole shape. 5. The method according to claim 3, wherein the outer frame positioning portion of the outer frame has a pin shape. 6. The method according to claim 3, wherein the outer frame positioning portion of the outer frame has a concave shape.