JPH07176074A - Manufacture of biaxial actuator - Google Patents

Abstract

PURPOSE:To correctly guide a light beam and its return light and to correctly obtain a focusing servo and a tracking servo and then to correctly perform fitting of an objective lens and setting of an optical axis of the objective lens. CONSTITUTION:On a plate-like base formed with plural elastic supporting parts 60, 62, 70 and 72 to be parallel to one another for movably supporting a 2nd resin part to be a movable part 50 to be fitted with the objective lens at least in the direction of the optical axis as against a 1st resin part to be a fixed part 52, the 1st resin part and the 2nd resin part are integrally formed to be connected up by the elastic supporting parts. In addition, connecting parts provided between the individual elastic supporting parts and the plate-like base part are formed not to be overlapped with each other when looking at in the direction of the optical axis of the objective lens, and the plural elastic supporting parts 60, 62, 70 and 72 are separated from the base by these connecting parts.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a biaxial actuator, and more particularly, the present invention relates to a method for manufacturing a biaxial actuator having a plurality of elastic supporting portions.

[0002]

2. Description of the Related Art An optical pickup is used to reproduce or record information signals on an optical disc, for example, a so-called compact disc (CD) or a magneto-optical disc. This optical pickup includes a semiconductor laser as a light source, an objective lens, an optical system, and a photodetector.

The light beam emitted from the semiconductor laser is
The light is focused on the recording surface of the optical disc by the objective lens through the optical system. The light beam reflected from the optical disc is separated from the light beam emitted from the semiconductor laser by the optical system and is guided to the photodetector. The light beam emitted from the semiconductor laser follows the displacement of the optical disc in the direction orthogonal to the surface direction of the optical disc caused by the warp of the optical disc and the like, and is focused so as to be focused on the recording surface of the optical disc. The position of the lens in the optical axis direction is adjusted. At the same time, the position in the direction orthogonal to the optical axis of the objective lens is adjusted so that the position of the spot of the light beam emitted from the semiconductor laser on the optical disc follows the eccentricity of the optical disc and the meandering of the track formed on the optical disc. It

The focus position of the light beam emitted from this semiconductor laser and the spot position on the recording surface of the optical disk are adjusted by adjusting the objective lens in the optical axis direction of the objective lens and in the direction orthogonal to the optical axis. It is done by adjusting. An electromagnetically driven actuator is used to adjust the position of the objective lens. This actuator is called an objective lens actuator or a biaxial actuator, and includes a bobbin to which the objective lens is attached, a plurality of elastic supports, and a drive unit that generates a driving force. The bobbin is supported by the plurality of elastic supporting portions with respect to the fixed portion such that the position in the optical axis direction of the objective lens, that is, the focus position and the position in the direction orthogonal to the optical axis of the objective lens, that is, the tracking position are adjustable. ing. An example of this actuator will be described with reference to FIG.

In FIG. 4, an actuator 1 includes a lens holder 2, a coil bobbin 3, a plurality of elastic supports 4a,
4b, 4c and 4d, a base 5 and a mounting portion 6. The lens holder 2 has an opening to which the coil bobbin 3 is attached, and the objective lens 2
A concave portion to which a is attached is formed. A hole through which a light beam emitted from the semiconductor laser or a return beam from the recording surface of the optical disk passes is formed on the bottom surface of this recess. The objective lens 2a is attached to the concave portion of the lens holder 2 by adhesion or the like. Lens holder 2
Is the focus direction Fcs and the tracking direction Tr by the plurality of elastic supports 4a, 4b, 4c and 4d.
It is movably supported by k.

The coil bobbin 3 is formed with an opening into which a magnetic circuit of a base 5 described later is inserted, and
A focus coil 3a and a plurality of tracking coils 3b, 3b are attached. Focus coil 3
A is wound around the bobbin 3 along an axis parallel to the optical axis of the objective lens 2a. Tracking coils 3b, 3b
Is formed by winding a coil in an elliptical or rectangular shape, and is attached to one side surface of the focus coil 2a. The upper surface of the coil bobbin 3 has a cover 3
covered by c. The cover 3c may form a closed magnetic circuit together with a yoke portion described later.
The coil bobbin 3 is attached to the opening formed in the lens holder 2 with the focus coil and the tracking coils 3b, 3b attached.

A plurality of elastic supports 4a, 4b, 4c, 4d
Is formed of an elastic body such as a leaf spring, and the lens holder 2
And the attachment part 6 so that they are parallel to each other,
It is attached by a method such as soldering. Base 5
A protrusion 7 to which the attachment portion 6 is attached and a pair of opposed yoke portions 8a and 8b forming a magnetic circuit are formed on the. In a state where the lens holder 2 and the mounting portion 6 are connected by the plurality of elastic supports 4, the mounting portion 6 is mounted on the protruding portion 7 by a method such as bonding. At this time, the projection 7 is formed so that the optical axis of the objective lens 2a does not tilt.
The attachment part 6 is attached to. A permanent magnet 9 is attached to the surface of the yoke portion 8b facing the yoke portion 8a. A magnetic circuit is constituted by the pair of yoke portions 8a and 8b and the permanent magnet 9.

With the attachment portion 6 attached to the protrusion 7, the focus coil 3a and the tracking coils 3b and 3b attached to the coil bobbin 3 are inserted into the gap between the permanent magnet 9 and the one yoke 8a portion. To be done. At the same time, the other yoke portion 8b and the permanent magnet 9 are
It is inserted into the opening of the coil bobbin 3.

In the actuator 1 thus constructed, the focus servo signal and the current based on the tracking servo signal are supplied to the focus coil 3a and the tracking coils 3b and 3b, respectively.
As a result, the DC magnetic field of the magnetic circuit and the focus coil 3a
And the alternating magnetic field generated from the tracking coils 3b and 3b causes the lens holder 2, that is, the objective lens 2a, to move in the focus direction Fcs and the tracking direction T.
Driven to rk.

In the actuator 1, in order to attach the elastic supports 4a, 4b, 4c and 4d to the lens holder 2, as shown in FIG. 5, four elastic supports 4 are previously prepared.
The a, 4b, 4c and 4d are separated from the base elastic body. A plurality of separated elastic supports 4a, 4
One end side of each of b, 4c, and 4d has a lens holder 2
As shown in FIGS. 4 and 5, the protrusions 2b, 2c, 2d and 2e for attachment are attached by a method such as adhesion or soldering. The other end of each of the elastic supports 4a, 4b, 4c and 4d is attached to the attaching projections 6a, 6b, 6c and 6d of the attaching portion 6 by the same method as described above.

In addition to the method of attaching the elastic supports 4a, 4b, 4c and 4d described above, the following method can be considered. Before separating the plurality of elastic supports 4 from the plate-shaped member serving as the base, that is, each elastic support 4a, 4
In a state where b, 4c and 4d are integrated with a plate-shaped member serving as a base, the lens holder 2 and the mounting portion 3
Is attached to a predetermined position of the plate member. The predetermined position means that when the elastic holders 4a, 4b, 4c and 4d are separated from the plate-like member after the lens holder 2 and the mounting portion 6 are attached, the elastic holders 4 as shown in FIG.
It is a position where the lens holder 2 and the mounting portion 6 are connected by a, 4b, 4c and 4d. In this state, a laser beam is irradiated to cut and separate the elastic supports 4a, 4b, 4c and 4d from the plate-shaped member.

[0012]

However, as shown in FIG. 5, each elastic support 4a, 4b, 4c and 4 is previously formed.
In order to attach d to the lens holder 2 and the mounting portion 6 in a state of being separated from the plate-shaped member serving as the base, the elastic supports 4a, 4b, 4c and 4d are attached to the lens holder 2 and the mounting portion 6 one by one. Must be installed. Therefore, the assembling work cannot be automated, and there arises a problem that the elastic support is bent during the assembling work, so that the assembling workability is very poor and the parts management is troublesome.

Furthermore, each elastic support 4a, 4b, 4c
And 4d, the elastic holders 4a, 4b, 4c and 4 are attached to the lens holder 2 and the attaching portion 6 during the attaching operation.
Since the parts d are not mounted so as to be parallel to each other, twisting is likely to occur. Thus, the elastic supports 4a, 4b, 4c
When 4 and 4d are twisted, the optical axis of the objective lens 2a is tilted, and the function as an actuator cannot be fully exerted. If the optical axis of the objective lens 2a is tilted, the light beam emitted from the objective lens 2a will not properly enter the recording surface of the optical disc, and the return light from the recording surface of the optical disc can be guided into the optical pickup. Disappear.

Further, as described above, after the lens holder 2 and the mounting portion 6 are mounted on the plate-shaped member in advance,
In the method of cutting with the laser beam, sparks may fly during cutting with the laser beam, and the sparks may be attached to the elastic supports 4a, 4b, 4c and 4d, the lens holder 2 and the mounting portion 6. . Elastic support 4a,
When sparks are attached to 4b, 4c and 4d, the spark-attached portions are deformed and the elastic support 4
Not only is there a risk of hindering the displacements of a, 4b, 4c, and 4d in the focus direction Fcs and the tracking direction Trk, the focusing servo or the tracking servo may easily come off. When the lens holder 2 is sparked, the lens holder 2 is deformed, which hinders the attachment of the objective lens 2a, and the optical axis of the attached objective lens 2a is tilted. This causes problems such as fear.

Therefore, the present invention has been made in order to solve the above problems, and it is possible to make a light beam enter a recording surface of an optical disk correctly and guide return light from the recording surface of the optical disk into an optical pickup. It is possible to obtain a focus servo and a tracking servo correctly, and it is possible to provide a method for manufacturing a biaxial actuator that can prevent the attachment of the objective lens and can prevent the influence of the tilt of the optical axis of the objective lens. To do.

[0016]

The above-mentioned object is, in the invention of claim 1, that a first portion which is a fixed portion and a second portion which is a movable portion to which an objective lens is attached are provided with respect to the fixed portion. On the base having a plurality of elastic support portions for movably supporting the movable portion at least in the optical axis direction of the objective lens, the plurality of elastic support portions form the first portion and the second portion. This is achieved by a method of manufacturing a biaxial actuator that is provided so as to be connected and that cuts off the plurality of elastic support portions from the base such that the cut-off positions of the plurality of elastic support portions are different from each other. In the invention of claim 2, the cut portions of the plurality of elastic support portions connect the first portion and the second portion so as not to overlap each other when viewed from the optical axis direction of the objective lens. Is provided. In the invention of claim 3, the plurality of elastic support portions are simultaneously cut off from the base by the pressing device. In the invention of claim 4, the first portion and the second portion are integrally formed of the synthetic resin on the base by insert molding.

According to the invention of claim 5, a frame portion having a rectangular opening portion, at least two arm portions provided in the opening portion so as to be parallel to each other, both ends of each of the arm portions, and the above-mentioned A plurality of connecting portions respectively connecting between the frame portion and each of the arm portions, at least two plate-shaped bases formed so that each of the arm portions crosses the opening portion are arranged in parallel to each other, A first resin part is provided between the two arm parts in a direction orthogonal to the longitudinal direction of the arm parts, and a second resin part to which an objective lens is attached at a position separated from the first resin part. This is achieved by a method of manufacturing a biaxial actuator in which the arms are formed and the arms are cut off from the frame at the connecting portions and at mutually different positions.
In the invention of claim 6, each of the connecting portions is formed so as not to overlap each other when viewed in a direction orthogonal to the plane of the plate-shaped base. In the invention of claim 7, the plurality of arm portions are simultaneously cut off from the base by the pressing device.

According to the invention of claim 8, the movable part of the biaxial actuator and the fixed part of the biaxial actuator are provided with a lens used for recording and reproducing information on the information recording medium or reproducing information on the information recording medium. Then, a plurality of stages of support members, each of which is integrally formed with a frame, are set to elastically support the movable portion with respect to the fixed portion, and the support members of the respective stages are cut from the respective frames. This is achieved by a method of manufacturing a biaxial actuator in which the supporting members at the respective stages are cut from the respective frames while making the positions different from each other. In the invention of claim 9, the plurality of support members are cut by press cutting.

[0019]

According to the above construction, in the invention of claim 1, the first
The first portion and the second portion by a plurality of elastic supporting portions on a base formed with a plurality of elastic supporting portions that support the second portion so as to be movable at least in the optical axis direction of the objective lens. Are provided so as to be connected. Then, the plurality of elastic supporting portions are cut off from the base so that the positions where the plurality of elastic supporting portions are cut off are different from each other. Thereby, the plurality of elastic support portions can be separated from the plurality of bases at once. Moreover, when the elastic support portion is cut off, unlike the conventional problem of cutting with a laser beam, no spark is generated, and the second portion and the elastic support portion are not deformed. Thus, the light beam can be correctly incident on the recording surface of the optical disc, and the return light from the recording surface of the optical disc can be guided into the optical pickup. Moreover, the focus servo and tracking servo can be obtained correctly. Since the second portion is not deformed or the like, the objective lens can be properly attached, and the influence of the inclination of the optical axis of the objective lens can be prevented. In the invention of claim 2, the cut portions of the plurality of elastic support portions connect the first portion and the second portion so that they do not overlap each other when viewed from the optical axis direction of the objective lens. In the invention of claim 3, the plurality of elastic support portions are simultaneously cut off from the base by the pressing device. Accordingly, it is possible to separate the plurality of elastic support portions from the plurality of bases at once using the pressing device.
In the invention of claim 4, the first portion and the second portion are integrally formed by insert molding on the base with a synthetic resin. This makes it easier for the base to
And a second portion can be formed.

According to the fifth aspect of the invention, at least two plate-shaped bases are formed so that each arm portion traverses the opening and are arranged in parallel with each other. A first resin portion is formed between the two arm portions in a direction orthogonal to the longitudinal direction of the arm portion, and a second resin portion to which the objective lens is attached is provided at a position separated from the first resin portion. Then, each arm portion is cut off from the frame portion at the connecting portion and at different positions. Thereby, a plurality of arm parts can be separated at a time from a plurality of bases. Moreover, when the arm portion is cut off, unlike the conventional cutting by the laser beam, no spark is generated, and the second resin portion or the elastic support portion is not deformed. With this, the light beam is correctly incident on the recording surface of the optical disc,
Moreover, the return light from the recording surface of the optical disc can be guided into the optical pickup. Moreover, the focus servo and tracking servo can be obtained correctly. Since the second resin portion is not deformed or the like, the objective lens can be properly attached and the influence of the inclination of the optical axis of the objective lens can be prevented. In the invention of claim 6, the connecting portions are formed so as not to overlap each other when viewed in a direction orthogonal to the plane of the plate-shaped base. In the invention of claim 7, the plurality of arm portions are simultaneously cut off from the base by the pressing device. Thereby, a plurality of arm parts can be separated from the base at once by using the pressing device.

According to the invention of claim 8, the movable part of the biaxial actuator and the fixed part of the biaxial actuator are provided with a lens used for recording / reproducing information on / from the information recording medium or reproducing information on the information recording medium. In order to elastically support the movable portion with respect to the fixed portion, a plurality of stages of support members, each of which is integrated with a frame, are set. The support members of each step are cut from each frame such that the positions of cutting the support members of each step from each frame are different from each other. In the invention of claim 9, the plurality of support members are cut by press cutting. Thereby, the plurality of support members can be separated from the plurality of frames at one time. Moreover, when cutting off the support member, unlike the conventional laser beam cutting, no spark is generated,
No deformation or the like occurs in the movable portion or the support member. Thus, the light beam can be correctly incident on the recording surface of the optical disc, and the return light from the recording surface of the optical disc can be guided into the optical pickup. Moreover, the focus servo and tracking servo can be obtained correctly. Since the movable portion is not deformed or the like, the objective lens can be properly attached and the influence of the inclination of the optical axis of the objective lens can be prevented.

[0022]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT A preferred embodiment of the present invention will be described in detail below with reference to the accompanying drawings. The examples described below are
Since it is a preferred specific example of the present invention, various technically preferable limitations are attached, but the scope of the present invention is, unless otherwise stated to limit the present invention, in the following description.
It is not limited to these modes.

A preferred embodiment of a method for manufacturing a biaxial actuator according to the present invention will be described in detail below with reference to the drawings. The biaxial actuator according to the present invention is also referred to as an objective lens actuator, and is hereinafter simply referred to as an actuator. Similar to the actuator shown in FIG. 4, the actuator of the present invention is an electromagnetic drive type actuator used for an optical pickup which records an information signal on an optical disc as a recording medium or reproduces an information signal. The actuator according to the present invention includes a lens holder 50 and a fixed portion 52. Lens holder 50
Both the fixing portion 52 and the fixing portion 52 are preferably made of synthetic resin. The fixing portion 52 is also called a first portion or a first resin portion, and the lens holder 50 which is a movable portion is a second portion or a second portion. Also referred to as the resin part.

The lens holder 50 is provided with a concave portion 100 in which an objective lens (not shown) for focusing the light beam emitted from the light source on the recording surface of the optical disk is mounted, a focus coil and a tracking coil, like the optical pickup described above. An opening is formed in which the attached coil bobbin is attached. The bottom surface of the recess 100 is formed with a through hole for passing a light beam. The lens holder 50 and the fixed portion 52 are connected by a plurality of elastic support portions 60, 62, 70 and 72. A coil bobbin (not shown) is attached to the opening of the lens holder 50, similar to the actuator shown in FIG.

The plate-like members 40 and 42 serving as a base for forming the plurality of elastic supporting portions 60, 62, 70 and 72 are
It is formed of phosphor bronze, beryllium copper, stainless steel, or the like. The plate-shaped members 40 and 42 are also referred to as bases or base members, and have a frame portion 140 having a rectangular opening 130. The plate-shaped members 40 and 42 are arranged so as to be parallel to each other, and the plate-shaped member 4
0 and 42 are formed into shapes as shown in FIGS. 1 and 2 by etching or pressing. That is, the plate-shaped members 40 and 42 include a frame-shaped frame portion, elastic support portions 60, 62, 70 and 72 also referred to as strip-shaped arm portions, and elastic support portions 60, 62, 70 and 72 and the frame portion. The connecting portions 80, 82, which are connected to the (frame portion 140),
84, 86, 90, 92, 94 and 96.
In the strip-shaped elastic support portions 60, 62, 70 and 72, other portions that become the attachment portions to the lens holder 50 and the fixing portion 52 are the portions that become the both end portions in the state of being cut off by the plate-shaped members 40 and 42. Wider tongues are each formed.

One end of the elastic support portion 60 is connected to the frame portion by the connecting portion 80, and the other end is connected to the frame portion by the connecting portion 82. One end of the elastic supporting portion 62 is connected to the frame portion by the connecting portion 84, the other end is connected to the frame portion by the connecting portion 86, and is connected so as to be parallel to the elastic supporting portion 80. . Similarly, the other elastic supporting portions 70 and 72 are connected by the connecting portions 90, 92, 94 and 96 so as to be parallel to each other. 1 and 2
In the drawing, a part of the plate-shaped members 40 and 42 is taken out and shown.

In practice, a frame portion and a plurality of elastic supporting portions are repeatedly formed in the front and rear portions, which are shown in the direction of the arrow Y in FIG. 1, and a lens holder 50 and a fixing portion 52 are provided for each of them. Is provided.

Each elastic support 60, 62, 70 and 72
Is shown as a leaf spring in the drawing, it is actually 50 to 100 μm in thickness and 0.1 to 0.3 m in width.
It is desirable to be formed in m. The elastic support portions 60, 62, 70 and 72 are formed to have such sizes, and the elastic support portions 60, 62, 70 and 72 are formed in the same manner as when the elastic support portions are formed of the wire-shaped elastic support body. The lens holder 50 can be favorably driven in the focus direction Fcs and the tracking direction Trk without being caught by the directionality of its own elastic displacement.

In a state in which at least the lens holder 50 and the fixing portion 52 are attached to the plate-like members 40 and 42 while being separated from each other, the elastic supporting portion 60 and the elastic supporting portion 70 are formed as shown in FIG.
Are located so as to overlap with each other when viewed from the Z-axis direction. Of course,
The lens holder 50 and the fixed portion 52 are connected to the plate-like member 40,
Even in the state before being attached to 42, the elastic support portion 60 and the elastic support portion 70 may be positioned so as to overlap each other when viewed from the Z-axis direction in FIG. Similarly, the elastic support portion 62 and the elastic support portion 72 are also positioned so as to overlap each other when viewed in the Z-axis direction in FIG.

However, the connecting portion 80 and the connecting portion 90 are shown in FIG.
As shown in FIG. 2, they are located so as not to overlap with each other when viewed from the Z-axis direction in FIG. Similarly, the other connecting portions 82 and 92, 84 and 9
Similarly, 4 and 86 and 96 are positioned so that they do not overlap. The elastic support portion 60 and the elastic support portion 62 may be continuous inside at least one of the lens holder 50 and the fixing portion 52. Similarly, the elastic support portion 70
And the elastic support portion 72 are the lens holder 50 and the fixing portion 52.
It may be continuous within.

The lens holder 50 and the fixed portion 52 are attached to the plate-shaped members 40 and 42 by a method such as insert molding, adhesion or thermal caulking. The lens holder 50 and the fixing portion 52 are formed of, for example, a synthetic resin material such as PPS (polyphenylene sulfide), PBT (polybutylene terephthalate), PC (polycarbonate). In this embodiment, the lens holder 5
The lens holder 50 and the fixed portion 52 are molded by so-called insert molding. First, the plate-shaped members 40 and 42 formed in a predetermined shape are inserted into a mold for injection molding, and positioned and held in the mold. In this state, the lens holder 50 and the fixed portion 52 are integrally molded with the plate-shaped members 40 and 42 by injecting the above-mentioned synthetic resin material into the mold.

Next, with the lens holder 50 and the fixed portion 52 thus integrally attached to the plate-like members 40 and 42, the elastic support portions 60, 62, 70 and 72 are provided.
A method of cutting the plate from the plate-shaped members 40 and 42 will be described. In the embodiment of the present invention, the elastic support portions 60, 6
2, 70 and 72 are cut off from the plate-shaped members 40 and 42 at the positions indicated by L1, L2, L3 and L4 in FIG. That is, each elastic support portion 60, 62, 70 and 7
2 connecting parts 80, 82, 84, 86, 90, 92,
Since 94 and 96 are formed so as not to overlap with each other as described above, the elastic supporting portions 60, 62, 70 and 72 are removed from the plate-like members 40 and 42 at a time by the positions shown by L1, L2, L3 and L4. Can be cut off.

As a cutting device for cutting the elastic supporting portions 60, 62, 70 and 72 from the plate-like members 40 and 42, a device as shown in FIG. 3 can be used. The cutting device 120 is a so-called pressing device, and includes an upper die 130 and a lower die 140 for cutting. The upper die 130 is moved in the direction of arrow X1 in FIG. 3 by a drive mechanism (not shown), and the lower die 140 is moved in the direction of arrow X2 in FIG. 3 by a drive mechanism (not shown). In a state where the lens holder 50 and the fixing portion 52 are integrally formed with the plate-shaped members 40 and 42, the cutting device 12
It is held by the upper and lower molds 130 and 140 while being positioned within 0. The positioning of the plate-shaped members 40 and 42 is performed by, for example, dies 130 and 1 forming a cutting device in a positioning hole (not shown) formed in the plate-shaped members 40 and 42.
This is performed by engaging a positioning pin (not shown) formed on at least one of the molds 40.

Thus, as shown in FIG. 3, the connecting portions 82 and 92 of the plate-like members 40 and 42 are arranged between the mold 130 and the mold 140. With the plate-shaped members 40 and 42 positioned and held, the upper die 130 and the lower die 140 are moved in opposite directions as shown in FIG. Parts 82, 92
Is cut at the position indicated by L2 in FIG.
A part of 0, 70 is cut off from the plate-shaped members 40, 42. At the same time, the other connecting portions 80, 84, 86, 90, 94 and 96 are also cut at the positions indicated by L1, L3 and L4 in FIG. 2 to provide elastic support portions 60, 62, 70 and 72.
Is completely cut off from the plate-shaped members 40 and 42.

The lens holder 50 and the fixed portion 5 which are cut off
An objective lens, a coil bobbin, and the like are attached to the unit composed of 2 and the elastic support portions 60, 62, 70, and 72, similarly to the actuator shown in FIG.
The fixed portion 52 is attached to the base provided with the magnetic circuit in the unit that has been attached. After that, wiring processing for supplying power to the focus coil and the tracking coil attached to the coil bobbin is performed.

As described above, the connecting portions 80, 82, 84,
Since 86, 90, 92, 94 and 96 are formed so as not to overlap each other when viewed from the Z-axis direction as shown in FIG. 2, the upper and lower molds 130, 140 allow the plate-shaped member 40, It can be cut off from 42. Therefore, in the embodiment according to the present invention, as described above, the spark does not occur unlike the case where the laser beam is used when cutting off from the elastic support portions 60, 62, 70 and 72, and the lens holder 50 And elastic support parts 60, 62, 7
No deformation or the like occurs in 0 and 72. Thus, the light beam can be correctly incident on the recording surface of the optical disc, and the return light from the recording surface of the optical disc can be guided into the optical pickup. Moreover, the focus servo and tracking servo can be obtained correctly. Since the lens holder 50 is not deformed or the like, the objective lens can be properly attached and the influence of the inclination of the optical axis of the objective lens can be prevented.

Further, each connecting portion 80, 82, 84, 86,
Since 90, 92, 94 and 96 are formed so as not to overlap each other, the plate-shaped member 4 serving as an easy base.
Since it can be cut off at once by 0, 42, the workability can be improved and the cut-off work can be automated. Furthermore, the plate-shaped members 40, 4
2, the step of integrally forming the lens holder 50 and the fixing portion 52, and the elastic supporting portions 60, 62, 70 and 72 from the plate-like members 40, 42 to the connecting portions 80, 82, 84, 8 respectively.
It is possible to shorten the time required for the step of cutting off at 6, 90, 92, 94 and 96, so-called tact time.

In the above-described embodiment, the plate-shaped members 40, 4
In FIG. 2, the lens holder 50 and the fixed portion 52 are integrally formed by insert molding. Not limited to this, after the lens holder 50 and the fixing portion 52 are attached to the plate-shaped members 40 and 42 in advance by adhesion or thermal caulking, the elastic support portions 60, 62, 70 and 72 are formed into the plate-shaped by the cutting device 120. From the members 40 and 42 to the connecting portions 80 and 8
It may be cut off at 2, 84, 86, 90, 92, 94 and 96. Further, in the above-described embodiments, the case of manufacturing the actuator that drives the objective lens in the focusing direction and the tracking direction has been described as an example, but it can be applied to the method of manufacturing the actuator that drives the objective lens only in the focusing direction.

According to the manufacturing method of the present invention, the first portion that serves as a fixed portion and the second portion that serves as a movable portion to which the objective lens is attached are provided with respect to the fixed portion at least in the optical axis direction of the objective lens. A plurality of elastic supporting portions that are movably supported on the base, the plurality of elastic supporting portions are provided so as to connect the first portion and the second portion, and the plurality of supporting portions are cut off from the base. Separate the supports so that they are different from each other. Further, in the manufacturing method of the present invention, a frame portion having a rectangular opening portion, at least two arm portions provided in the opening portion so as to be parallel to each other, both ends of each arm portion and the frame portion. At least two plate-shaped bases are provided so as to cross each opening, and the plurality of connecting portions are connected to each other. A first resin portion and a second resin portion, to which the objective lens is attached, are formed between the first resin portion and the first resin portion in a direction orthogonal to the longitudinal direction of the arm portion, and the arm portions are connected to each other. And are cut off from the frame at different positions.

According to the present invention, each elastic support portion and each arm portion are cut off from the base at different positions, so that each elastic support portion, each arm portion serves as a fixed portion and a movable portion. It is possible to cut off from the base at once in a connected state. It goes without saying that the present invention is not limited to the above-described embodiments, and various modifications can be made without departing from the spirit of the present invention.

[0041]

As described above, according to the present invention,
The light beam can be correctly incident on the recording surface of the optical disk, and the return light from the recording surface of the optical disk can be guided into the optical pickup, so that the focus servo and tracking servo can be correctly obtained, and the attachment of the objective lens is hindered. It is possible to prevent the influence of the inclination of the optical axis of the objective lens.

[Brief description of drawings]

FIG. 1 is a perspective view for explaining a method of cutting a biaxial actuator (objective lens actuator) according to the present invention.

FIG. 2 is a plan view for explaining a cutting method of the biaxial actuator shown in FIG.

FIG. 3 is a sectional view of relevant parts for explaining a method of cutting a biaxial actuator according to the present invention.

FIG. 4 is an exploded perspective view showing a configuration of an objective lens actuator.

FIG. 5 is an exploded perspective view showing a support structure of a lens holder.

[Explanation of symbols]

40, 42 plate-shaped members (base, frame) 50 lens holder (second resin portion, second)
Part 52) fixing part (first resin part, first part) 60, 62, 70, 72 elastic supporting part (supporting member,
Arm portion) 80, 82, 84, 86, 90, 92, 94, 96 Connecting portion 130 Base opening portion 140 Base frame portion

Claims (9)

[Claims] 1. A first portion, which is a fixed portion, and a second portion, which is a movable portion to which an objective lens is attached, are moved with respect to the fixed portion at least in the optical axis direction of the objective lens. The first elastic member is formed on the base on which a plurality of elastic supporting members that support the first elastic member are formed.
Is provided so as to connect the second portion to the second portion, and the plurality of elastic supporting portions are cut off from the base so that the positions where the plurality of elastic supporting portions are cut off from each other are different from each other. Production method. 2. The cut parts of the plurality of elastic support parts connect the first part and the second part so that they do not overlap each other when viewed from the optical axis direction of the objective lens. The biaxial actuator manufacturing method according to claim 1, wherein the biaxial actuator is provided. 3. The method for manufacturing a biaxial actuator according to claim 1, wherein the plurality of elastic support portions are simultaneously cut off from the base by a pressing device. 4. The manufacture of a biaxial actuator according to claim 1, wherein the first portion and the second portion are integrally formed on the base with synthetic resin by insert molding. Method. 5. A frame portion having a rectangular opening, at least two arm portions provided in the opening portion so as to be parallel to each other, and between both ends of each arm portion and the frame portion. At least two plate-shaped bases formed so that each of the arm portions traverses the opening are arranged so as to be parallel to each other. A first resin portion in a direction orthogonal to the longitudinal direction of the arm portion, and a second resin portion to which the objective lens is attached at a position separated from the first resin portion, between the portions; A method for manufacturing a biaxial actuator, wherein an arm portion is cut off from the frame portion at the connecting portion and at different positions. 6. The 2 according to claim 5, wherein each of the connecting portions is formed so as not to overlap each other when viewed in a direction orthogonal to a plane of the plate-shaped base. Axis actuator manufacturing method. 7. The method of manufacturing a biaxial actuator according to claim 5, wherein the plurality of arm portions are simultaneously cut off from the base by a pressing device. 8. A movable part of a biaxial actuator provided with a lens used for recording / reproducing information to / from an information recording medium or reproducing information of the information recording medium, and the movable part with respect to a fixed part of the biaxial actuator. In order to elastically support the fixing portion with respect to the fixing portion, a plurality of stages of supporting members, each of which is integrated with a frame, are set, and the positions of cutting the supporting members of the stages from the frames are different from each other. Then, the method of manufacturing a biaxial actuator, characterized in that the supporting members at the respective stages are cut from the respective frames. 9. The method for manufacturing a biaxial actuator according to claim 8, wherein the plurality of support members are cut by press cutting.