JPH0887766A - Objective lens actuator and its production - Google Patents

Abstract

PURPOSE: To facilitate the assembly and to reduce the number of parts and then to stabilize the posture of an objective lens and also to enhance the moving accuracy. CONSTITUTION: A lens holder 2 holding the objective lens 1 and a housing 10 are molded simultaneously with insertion of four suspension wires 8 inserted into a metal mold. Afterward, the lens holder 2 is fixed with one pair of magnets, and then a coil frame 5 wound with an electromagnetic coil 6, whose wire ends are wound around wire processing grooves 5e and 5f and are processed to be soldered, is fixed to the housing 10.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an objective lens actuator for recording on or reproducing from an optically disk-shaped recording / reproducing medium and a method for manufacturing the same.

[0002]

2. Description of the Related Art In recent years, an apparatus (hereinafter referred to as an optical disk apparatus) for recording and reproducing information using a disc-shaped optical recording / reproducing medium (hereinafter referred to as a disk) has advantages of large capacity and high speed. It is recognized and widely used for voice, image and data recording. Among the parts incorporated in this optical disk device, the objective lens actuator is positioned as an important mechanical part that affects the recording / reproducing performance.

A conventional objective lens actuator will be described below with reference to the drawings. FIG. 14 is an external perspective view of a conventional objective lens actuator, and FIG. 15 is an exploded perspective view of the objective lens actuator. This example shows an objective lens actuator in which four suspension wires are used to hold a lens holder, which is now widely used.

In FIGS. 14 and 15, the objective lens 1 is adhesively fixed to the upper surface of the drawing and the balance weight 34 is adhesively fixed to the lower surface of the lens holder 32, and the tip ends of the suspension wires 39 are soldered and fixed to both side surfaces. The substrate 35 is magnetized in the N-S direction on the other side surfaces as shown in the figure, and the two magnets 3 are fixed by adhesion. The support holder 37 is fixed to one end of the base 40, and the support holder 37
A soldering substrate 38 for fixing the other end of the suspension wire 39 by soldering is fixedly attached to the. The suspension wire 39 is obtained by cutting a linear spring material into a predetermined length, and has a small hole 43 of the soldering substrate 38 made of a printed board, a small hole 44 of the support holder 37, and a small hole 45 of the holder 32. Penetrating through, four pieces are arranged in parallel, and both ends thereof are connected to the soldering board 35 fixed to the lens holder 32 and the soldering board 38 fixed to the support holder 37 by soldering portions 41 and 42 in the figure. Soldered.

An electromagnetic coil 36, which faces the magnet 3 and is electromagnetically driven to electromagnetically drive the magnet 3, is also fixed at a predetermined position of the base 40, and the one having the arrow X1-X2 as the axis and the arrow Y1-Y2 as the axis. There are two types of windings. 16 is a view from the direction of arrow H in FIG.
The four suspension wires 39 are installed vertically and horizontally at equal intervals. Then, the cover 46 having the opening 46a is attached to the base 40 from above the assembled one by the hook portion 46b.

The operation of the conventional objective lens actuator constructed as above will be described below.
Both ends of the suspension wire 39 are fixed, and the lens holder 32 side is cantilevered with respect to the support holder 37, and the lens holder 32 is supported by the arrow X1-X2 and the arrow Y1.
It is possible to translate in the -Y2 direction.
When a current was applied to two types of windings, one having the arrow X1-X2 as the axis and the other having the arrow Y1-Y2 as the axis, the electromagnetic coil 36 was magnetized in the N-S direction so as to be opposed to and separated from it. Magnet 3
An arrow X is applied to each magnet 3 by the electromagnetic force generated between
A driving force in the 1-X2, Y1-Y2 directions is generated to move the lens holder 32, and thus the objective lens 1 fixed thereto.
Are driven in the directions of arrows X1-X2 and Y1-Y2.

As a result, it is possible to move the focal position of the laser beam focused on the disc (not shown) above the objective lens through the objective lens 1, such as surface wobbling in the disc surface direction and eccentricity in the radial direction. The recording or reproducing operation of the information signal is performed following the.

[0008]

However, in the structure of the above-mentioned conventional example, the small hole 45 of the lens holder 32 and the small hole of the support holder 37 through which the suspension wire 39 is passed in order to ensure the accuracy of the parallel movement of the lens holder 32. It is necessary to make the diameter of 44 substantially the same as the diameter of the suspension wire 39 as much as possible, which makes it difficult to insert the suspension wire 39, and the soldering work for fixing both ends of the suspension wire 39 is required to control strength and joint length. However, there is a problem in assembly that it is difficult in terms of

Further, in the above-described structure and manufacturing method, the suspension wire 39 is apt to bend or twist,
There is also a performance problem that the posture accuracy of the objective lens 1 is not stable and it hinders the parallel movement of the objective lens.

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned conventional problems, and an object thereof is to provide an objective lens actuator having a small number of parts, easy to assemble, and excellent in posture stability.

[0011]

To achieve the above object, an objective lens actuator of the present invention comprises a lens holding member for holding an objective lens, a plurality of linear spring members for supporting the lens holding member, and A fixing member for fixing the linear spring member is provided, and the lens holding member, the linear spring member and the fixing member are integrally formed by molding.

Alternatively, instead of molding, a plurality of lens holding members for holding the objective lens, a plurality of linear spring members for supporting the lens holding members, and a plurality of fixing the linear spring members are provided. And a fixing member divided into two parts, and the linear spring member is sandwiched and fixed by the plurality of lens holding members and the plurality of fixing members to be integrally formed.

Further, the linear spring members are arranged on two upper and lower parallel lines facing each other, and the distance between the pair of linear spring members on one parallel line and the pair of linear spring members on the other parallel line is different from each other. Are arranged in such a manner that the spring members facing vertically, horizontally, or diagonally of the linear spring members which are arranged so as to face each other and are spaced apart from each other are arranged so that the bending directions which are unavoidably generated in manufacturing the material are opposite to each other. .

If necessary, the entire surface of the linear spring member or at least the portion to be enclosed in the lens holding member or the fixing member has a projecting section, a recessed section, or a rough surface. The member is configured to have two surfaces parallel to each other.

In the method of manufacturing an objective lens actuator according to the present invention to achieve the above object, a frame-shaped fixing member for fixing each of a plurality of linear spring members at two points and an intermediate portion of the fixing member. A lens holding member that does not come into contact with the fixing member, and after that, or after incorporating the necessary accessory parts, one of the linear spring member between the lens holding member and the fixing member is formed. This is a method in which the lens holding member is cantilevered by cutting everything.

Further, a frame-shaped fixing member for fixing two or more continuous linear spring members at two points and a lens holding member which is not in contact with the fixing member are continuously formed at an intermediate portion of the fixing member. In this method, the lens holding member and the fixing member can be formed by molding.

[0017]

According to the objective lens actuator of the present invention, the lens holding member mounted on the frame-shaped fixing member via the linear spring member can be mounted with high accuracy and the mounting strength can be increased by the above structure and manufacturing method. it can. Furthermore, due to the mounting interval of the linear spring members and the regulation of the bending direction thereof, bending and twisting of the linear spring members are less likely to occur,
The lens holding member, that is, the objective lens held by the lens holding member, stabilizes its posture and acts to improve the movement accuracy.

Further, according to the method of manufacturing the objective lens actuator of the present invention, the fixing work of the linear spring for ensuring the parallel movement of the lens holding member is easy, and the mounting accuracy and the mounting strength can be increased to improve the manufacturing efficiency. .

[0019]

Embodiments of the present invention will be described below with reference to the drawings. 1 is an external perspective view of an objective lens actuator of a first embodiment of the present invention, and FIG. 2 is an exploded perspective view of the objective lens actuator. In FIG. 1 and FIG. 2, a lens holder 2 which is a lens holding member made of synthetic resin has an objective lens 1 on the upper surface and an optical plate 4 on the lower surface.
Are bonded and fixed, and the ends of the suspension wire 8 which is a linear spring member made of phosphor bronze or stainless steel having a wire diameter of about 100 microns is molded and fixed to the protrusions 2a on both sides. Two magnets 3 which are magnetized in the NS direction as shown in the figure are fixed to the protruding portion 2a and the other both side surfaces at positions of 90 degrees by adhesion or molding. The other end of the suspension wire 8 is molded and fixed to one side wall 10a on a frame-shaped housing 10 which is a fixing member formed of synthetic resin at four fixing points 8a to 8d by molding. And the hole 11 for attachment is provided suitably.

The coil frame 5 made of synthetic resin is provided with a winding portion 5a in the center, a covering portion 5b having a protruding portion 5c at one end at both upper ends thereof, and two covering portions 5b on both outer sides thereof. There are wire winding treatment grooves 5e and 5f, and further the housing 1
Positioning fixing holes 5g for firmly fitting and fixing the positioning fixing pins 10b protruding at the four corners of 0 are provided on the lower surfaces of both ends. In the winding portion 5a, the electromagnetic coil 6 has an arrow X1-X on the winding 6a with the arrow Y1-Y2 as an axis.
The winding wire 6b having the axis 2 is overlapped and wound. Then, the winding start and winding end of each of them is wound several times around the wire treatment grooves 5e and 5f, and soldered to the outer edge portions of each wound wire to be fixed. For example, a flexible printed circuit board is brought into contact with this portion, and a braking material holding frame 7 formed of a transparent synthetic resin for applying a signal current to the electromagnetic coil 6 by soldering is projected to two lower portions of the housing 10. Positioning fixed holes 7a for firmly fitting and fixing the positioning fixing pins 10c are provided at both ends, and two partition walls 7b are provided inside thereof.

The assembling method of the objective lens actuator of the present embodiment having the above structure will be described below. The other end of the suspension wire 8 molded and fixed to the protrusions 2a on both sides of the lens holder 2 is fixed to one side wall 10a of the housing 10 by mold, and the lens holder 2 is cantilevered by the four suspension wires 8. There is. The two coil frames 5 around which the coils 6 are wound are symmetrically placed from above the housing 10, and the positioning fixing pin 10b of the housing 10 is press-fitted into the positioning fixed hole 5g.

Next, the braking material holding frame 7 is press-fitted from below into the positioning fixed hole 7a in alignment with the positioning fixing pin 10c of the housing 10. When the braking material holding frame 7 and the partition wall 7b are fixed, the housing 10
Since the inner wall 10d and the covering portion 5b of the coil frame 5 form a space that encloses two suspension wires 8 from each of the five directions, the space has a liquid state, for example, an ultraviolet curable property containing silicon as a main component. Optimal braking effect when a suspension material 8 vibrates while supporting the lens holder 2 by injecting a braking material 9 (not shown) and irradiating ultraviolet rays from the lower surface of the transparent braking material holding frame 7 to cause gelation. To have. The damping material may be a viscoelastic body such as rubber or elastomer in addition to the gel body.

Next, the operation of the objective lens actuator of the first embodiment thus constructed will be described.
The electromagnetic coil 6 with the arrows X1-X2 as its axis and the arrow Y
When a current is applied to each of the windings 6a and 6b having 1-Y2 as an axis and two types of windings 6a and 6b, the lens is generated by an electromagnetic force generated between the windings 6a and 6b facing each other and magnetized in the NS direction. The arrows X1-X are respectively attached to the magnets 3 fixed to the holder 2.
A lens holder 2 that is cantilevered by a suspension wire 8 by generating a driving force in the Y2 and Y1-Y2 directions
And therefore the objective lens 1 fixed on it by the arrow X
Drive in the 1-X2, Y1-Y2 directions. At this time, the braking member 9 supports the lens holder 2 and gives an optimum braking effect to the vibrating suspension wire 8.

This makes it possible to move the focus position of the laser beam focused on the disc (not shown) above the objective lens through the objective lens 1, and thus the surface wobbling and the radius in the plane direction of the disc. The recording and reproducing operation of the information signal is performed following the eccentricity of the direction.

The housing 10 and the coil frame 5 or the braking material holding frame 7 may be fixed to each other by replacing the positioning fixing pin and the positioning fixed hole, which are opposed to each other, instead of the illustrated method. The position regulating members may be provided to each other and then fixed by adhesion or ultrasonic welding.
Although not shown, a cover corresponding to the cover 46 of the conventional example shown in FIG. 15 may be used if necessary, but the covering portion 5b and the protrusion 5c of the coil frame 5 cover a considerable area, and are not always necessary. The cover need not be used.

The basic first embodiment of the present invention has been described above, but more specific details for carrying out the present invention will be described. FIG. 3 is a plan view showing a state where the lens holder 2 is cantilevered by the suspension wire 10 with respect to the housing 10 according to the second embodiment of the present invention,
FIG. 4 is a front view of the housing 10 as seen from the direction of arrow B in FIG. In the figure, the suspension wire 8 has a narrower pair of intervals on the lower side than a pair of intervals on the upper side. The first reason is the manufacturing method, and the second reason is the performance problem. First, manufacturing problems will be described.

FIG. 5 is a sectional view of a mold for molding the part shown in FIG. 3 by injection molding, and FIG.
5B shows a die section of a C1-C2 section, and FIG. 5C shows a die section of a D1-D2 section. In this way, unless the suspension wire 8 is firmly held by the upper die 31 and the lower die 32 of the mold and the molten molding material is injected, the thin suspension wire 8 bends during molding. In FIG. 5, the suspension wires 8a and 8c, 8b and 8d are not vertically arranged vertically. If this is to be arranged vertically and to be firmly held by the mold, side molds must be used instead of the simple mold divided into upper and lower parts as shown in Fig. 5, and the mold structure becomes complicated. Cost and rises. The purpose is to avoid this and simplify the mold structure. The shaded portions in the figure correspond to the lens holder 2 and the housing 10.

The above is the manufacturing problem, and the suspension wires 8 are arranged in such a manner that the dies 21 and 2 are arranged.
It was solved by sandwiching it by 2, but as a result, we found by chance that such an array has a good performance effect. That is, in FIG. 6A, if the disc 24 fixed to the turntable 23 is exaggeratedly written, gravity tends to cause it to hang down in the direction of the arrow E. Most of them work at the center. At this time, the operation is most stable when the point connecting the diagonals of the four suspension wires 8 vibrating vertically and horizontally as shown in FIG. 6B coincides with the neutral point, but the neutral point is lowered by δ. When used, as shown in the diagram on the right side of FIG. 6 (b), the lower pair of four suspension wires 8 are closely spaced and diagonally connecting points are lowered by δ to ensure stable operation. Becomes

Therefore, when the head is arranged also on the upper side of the disk 24, the distance between 8a and 8b in FIG.
It is sufficient to make something narrower than the distance between c and 8d and turn it upside down.

Next, an example in which the manufacturing problem is solved and the performance is improved will be shown. FIG. 7 is an explanatory view of means for solving the bending of the suspension wire 8. The material of the suspension wire 8 is received as a hoop material wound on a reel as shown in FIG. Therefore, if there is a slight curl and the length of the exposed portion when incorporated in the objective lens actuator is 8 mm, the figure (b)
It will be curved to the extent of. This state is illustrated in the perspective view of FIG. 7C, and the view from the direction of arrow F in FIG. If the bending direction as shown in FIG. 7D is indicated by the arrow on the left side of the drawing as the bending direction of the tip with respect to the fixed point, the bending direction of the four suspension wires 8 is shown as (e) to (j) in FIG. As shown in FIG. 7 (e), for example, the two left-hand ends are curved inwardly with respect to each other, and the same is true for the two right-hand ends. The figure (f) shows a combination in the opposite direction, the figures (g) and (h) show a point-symmetrical combination, and the figures (i) and (j) show a laterally opposed combination. The lens holder 2 is fixed to the fixed point by assembling the suspension wires 8 vertically or horizontally or diagonally so as to face each other in the bending direction or to be separated from each other, that is, the bending directions are opposite to each other. Be careful not to bend and fix it to one side or twist the direction of vibration. Although not so preferable, the two right-hand sides may face each other inwardly as opposed to the left-hand side as shown in the brackets in FIG. A great number of combinations can be made by combining such combinations.

Next, when determining the directionality of the suspension wire 8 as shown in FIG. 7, it is practically difficult to assemble it if the wire has a round cross section. Therefore, the hoop material wound around the reel and received as shown in FIG. 7A is rolled from above and below as shown in FIG. 8A to obtain a cross section as shown in FIG. 8B. Alternatively, it is further processed to form a cross section as shown in FIG.
Wind it on the reel like. Then, at first, the material as shown in FIG. 7E becomes as shown in FIG. 7F and the direction of curvature becomes perpendicular to the longitudinal direction of the cross section. For example, as shown in FIGS. When determining, the direction can be determined in the mold, and there are excellent features such as less twisting of the wire than in the round shape. This processing may be done with a press,
Since the processing is intermittent, it is preferable to roll it between two rolls, or it may be processed by drawing through one or more dies.

Next, the pull-out strength when the suspension wire 8 is inserted into the lens holder 2 or the housing 10 will be considered. Since the wire material is usually thinned by drawing or the like, its surface is generally smooth. If it is inserted as it is, the pulling-out strength is weak, and it is considered that the molded product may come off with a slight force due to shrinkage or the like, which causes the posture of the lens holder 2 to change. As a countermeasure, a protrusion is partially provided as shown in FIG. For example, solder or the like is added to this. In the figure (b), a depression is provided by pressing. Alternatively, if a recess is provided, it may bulge in the 90 ° direction. Knurling may be performed on the entire circumference or a specific surface as shown in FIG. The surface may be roughened by sandblasting or etching as shown in FIG. The above processing may be performed only on the portion to be inserted, and may be performed continuously or intermittently over the entire length if positioning is difficult.

Next, another means which does not use the braking material holding frame 7 in FIG. 2 will be described. 10A shows a viscoelastic material 25 formed by secondary molding in contact with a side wall 10a of the housing 10 which serves as a fixing point of the suspension wire 8 instead of providing the braking material holding frame 7 of FIG. 2 for damping the suspension wire 8. Is molded. Figure 10 (b)
Shows the mold structure of the G1-G2 cross section in the same (a).
In this way, the braking material can be formed by secondary molding instead of the process of adding parts, injecting liquid, and solidifying.

Next, a third embodiment of the present invention will be described. The third embodiment relates to improvement of the manufacturing method. Figure 11
In, the suspension wire 8 penetrates the lens holder 2, and further penetrates the side wall 10d that faces the side wall 10a that holds the original fixing point of the suspension wire 8 in the housing 10. If the length of the suspension wire 8 is adjusted to the length of the housing 10 or is made slightly shorter, the suspension wire 8 will not protrude from the housing 10. By molding in this way, the mold 2 of FIG.
Positioning of the suspension wire 8 in the inside of 1 and 22 becomes easy, and the rigidity of the molded parts is high and manufacturing becomes easy. However, since the lens holder 2 cannot be supported in a cantilever manner if the suspension wire in the portion 8e in the drawing remains, it is sufficient to cut off this portion or an unnecessary portion outside by a mold or burn out with a laser beam. This cutting can be done in the state of FIG. 11, but if it is cut and processed in this state, it will be easily deformed in the subsequent assembly work and it will be difficult to assemble, so if possible, after assembling to the state of FIG. If it is cut at the part, deformation during assembly is unlikely to occur and assembly becomes easy.

Although the ones in the state of FIG. 11 may be molded one by one, a continuous molding process as shown in FIG. 12 may be considered in order to further improve the processing efficiency. In FIG. 12, the reel 26 is wound with the suspension wire material 8g processed as shown in FIG. 8, for example, and the warp direction at this time is the same as that described with reference to FIG. Roller 27
The retainer forming press 28 performs retaining treatment as shown in FIG. This is not limited to pressing, and other retaining methods may be used. Next, using the injection molding machine 29, the mold 21,
22 for continuous injection molding. The finished product is wound on the take-up reel 30 and separated in a separate process.

If the material of the reel 26 has already been subjected to the retaining process as shown in FIG. 9, the retaining forming press 28 is unnecessary. If a roll processing machine is provided in front of the retaining molding press 28, the raw material of the reel 26 may be an unprocessed wire. Further, if the suspension wire is cut without being wound on the reel 30, or the electromagnetic coil 6, the braking material holding frame 7 and the like are incorporated, the braking material is injected and solidified, and the suspension wire is cut continuously. Automatic processing can be performed.

The case where the housing 10 and the lens holder 2 are processed and assembled by the molding via the suspension wire 8 has been described above. However, instead of the molding as shown in FIG. 13, for example, the lens holder 2 is explained. Then, the lens holder is attached to the central portion 2b, the upper and lower portions 2c, 2d.
The suspension wire 8 is sandwiched between
Similar products can be obtained by gluing or ultrasonically welding a person. Although the housing 10 and the lens holder 2 are vertically divided in the example, it is needless to say that the housing 10 and the lens holder 2 may be divided into left and right.

The above-mentioned respective embodiments may be carried out independently, or the parts of the respective embodiments may be combined and carried out. Further, it goes without saying that it may be implemented by adding a conventionally known example.

[0039]

As described above, according to the objective lens actuator of the present invention, the main components are a lens holding member for holding the objective lens, a plurality of linear spring members for supporting the lens holding member, and a linear spring. A lens holding member, a linear spring member, and a fixing member are integrally formed by molding, or a holding member that fixes the member, or is divided into a plurality of pieces instead of molding to hold the objective lens. Lens holding member, a plurality of linear spring members that support the lens holding member, and a fixing member that is divided into a plurality of portions to fix the linear spring member, and a plurality of lens holding members and a plurality of fixing members. Thus, the linear spring member is clamped and fixed to be integrally formed.

Further, the linear spring members are arranged on two upper and lower parallel lines facing each other, and the distance between the pair of linear spring members on one parallel line and the pair of linear spring members on the other parallel line is different from each other. Are arranged in such a manner that the spring members facing vertically, horizontally, or diagonally of the linear spring members which are arranged so as to face each other and are spaced apart from each other are arranged so that the bending directions which are unavoidably generated in manufacturing the material are opposite to each other. .

If necessary, the entire surface of the linear spring member or at least the portion to be enclosed in the lens holding member or the fixing member has a projecting section, a recessed section or a rough surface.

Further, in the method of manufacturing the objective lens actuator of the present invention, each of the plurality of linear spring members is divided into two parts.
A frame-shaped fixing member that is fixed at a point and a lens holding member that does not come into contact with the fixing member are formed in an intermediate portion, and after that, or after the necessary accessory parts are incorporated, a lens holding member of a linear spring member. The lens holding member can be cantilevered by cutting one of the fixing member and the frame-like fixing member which is fixed at two points to a plurality of continuous linear spring members and an intermediate member. A method of continuously forming a lens holding member that does not come into contact with the fixing member on the portion can be adopted, and in this method, the lens holding member and the fixing member can be formed by molding.

Therefore, it is possible to improve the mounting accuracy of the lens holding member mounted on the frame-shaped fixing member via the linear spring member and to increase the mounting strength. Further, due to the mounting interval of the linear spring members and the regulation of the bending direction thereof, the linear spring members are unlikely to bend or twist, and the posture of the lens holding member, that is, the objective lens held by the linear holding members is stable and the movement accuracy is improved. .

Also, the configuration and manufacturing method of the present invention significantly reduce the number of parts used, and eliminate the need for inserting a linear spring into a narrow hole as in the prior art or a manual operation with a large variation such as soldering. Since continuous molding is also possible, the work of fixing the linear spring for securing the parallel movement of the lens holding member becomes easy, and the mounting accuracy and the mounting strength can be increased, the cost can be reduced, and the manufacturing efficiency can be improved.

[Brief description of drawings]

FIG. 1 is an external perspective view of an objective lens actuator according to a first embodiment of the present invention.

FIG. 2 is an exploded perspective view of the objective lens actuator.

FIG. 3 is a plan view showing a state where the lens holder 2 is cantilevered by the suspension wire 10 with respect to the housing 10 of the second embodiment.

FIG. 4 is a housing 1 seen from the direction of arrow B in FIG.
Front view of 0

5 is a cross-sectional view of a mold for molding the component shown in FIG. 3 by injection molding (a) B1-B2 cross section in FIG. 3 (b) C1-C2 cross section in FIG. 3 (c) in FIG. D1-D2 cross section

FIG. 6A is an explanatory view showing the operation of the lens holder due to the warp of the disk. FIG. 6B is an explanatory view of the relationship between the neutral point of the four suspension wires of the lens holder and the stable operation point.

FIG. 7 is an explanatory view of a means for solving the bending of the suspension wire (a) A perspective view of a hoop material as a material of the suspension wire (b) An explanatory view showing the bending of the suspension wire (c) A state assembled as an actuator Perspective view (d) View from the direction of arrow F in FIG. (C) (e) to (j) Explanatory view of combination of four suspension wires 8 in bending direction

FIG. 8 is a processing explanatory view of the suspension wire material (a) An explanatory drawing of rolling from above and below (b), (c) A sectional view of the suspension wire material (d) A perspective view of the processed hoop material wound on a reel ( e) Perspective view of material before processing (f) Perspective view of material after processing

9 (a) to 9 (d) are explanatory views of a suspension wire material retaining process.

FIG. 10 is an explanatory view showing another embodiment of forming a braking material of a suspension wire. (A) A perspective view showing the formed braking material (b) A mold structure of a G1-G2 cross section in FIG. Cross section

FIG. 11 is a plan view showing an assembled state of the housing and the lens holder via the suspension wire of the third embodiment.

FIG. 12 is an explanatory view showing a continuous molding process in the manufacturing method of the present invention.

13A is an explanatory view showing an example of another assembling method of the present invention. FIG. 13B is a sectional view of the same as the assembled state.

FIG. 14 is an external perspective view of a conventional objective lens actuator.

FIG. 15 is an exploded perspective view of the objective lens actuator.

16 is a view from the direction of arrow H in FIG.

[Explanation of symbols]

 1 Objective Lens 2 Lens Holder (Lens Holding Member) 2a Projection Part 3 Magnet 4 Optical Plate 5 Coil Frame 6 Electromagnetic Coil 7 Braking Material Holding Frame 7b Partition Wall 8 Suspension Wire (Linear Spring Member) 8f Cutting Section 9 Braking Material 10 Housing ( Fixing member) 25 Viscoelastic material

Claims (19)

[Claims] 1. A lens holding member for holding an objective lens, a plurality of linear spring members for supporting said lens holding member, and a fixing member for fixing said linear spring member, said lens holding member, said An objective lens actuator in which a linear spring member and the fixing member are integrally formed by molding. 2. A lens holding member divided into a plurality for holding an objective lens, a plurality of linear spring members supporting the lens holding member, and a plurality of divided linear spring members fixing the linear spring member. An objective lens actuator, comprising: a fixing member, which is integrally formed by sandwiching and fixing the linear spring member by the plurality of lens holding members and the plurality of fixing members. 3. The objective lens actuator according to claim 1, wherein the fixing member has a frame shape and is capable of positioning and fixing and holding a coil frame around which a pair of electromagnetic coils are wound. 4. The objective lens actuator according to claim 1, wherein the lens holding member has a pair of magnets fixed by adhesion or molding. 5. A linear spring member is arranged on two upper and lower parallel lines facing each other and spaced apart from each other, and a pair of linear spring members on one parallel line and a pair of linear spring members on the other parallel line are spaced apart from each other. The objective lens actuator according to claim 1, wherein the objective lens actuators are arranged differently. 6. The objective lens actuator according to claim 5, wherein a pair of the upper pair and the lower pair of linear spring members, which is closer to the lens in the lens optical axis direction, has a larger gap than the other pair. 7. The objective lens actuator according to claim 5, wherein a pair of the upper pair and the lower pair of linear spring members, which is closer to the lens in the lens optical axis direction, has a smaller gap than the other pair. 8. A linear spring member arranged to face each other and spaced apart from each other, wherein spring members facing vertically, horizontally, or diagonally have bending directions opposite to each other. The objective lens actuator according to 1. 9. The objective lens actuator according to claim 1, wherein the entire surface of the linear spring member or at least a portion to be enclosed in the lens holding member or the fixing member has a projecting section, a recessed section or a rough surface. 10. The linear springs are at least two parallel to each other.
The objective lens actuator according to claim 4, which has a surface. 11. A wire for winding a double coil in a two-axis direction orthogonal to each other on a coil frame, and for winding start and end of a coil winding between both ends of the coil winding portion and a fixing portion with a fixing member. The objective lens actuator according to claim 3, wherein the objective lens actuator has a processing groove. 12. A braking material holding means for forming a space surrounding a linear spring between a side wall of a fixing member and a coil frame having a partition wall, and enclosing a damping material of gel or viscoelastic body in this space. The objective lens actuator according to claim 3, wherein the frame is fixed to the fixing member. 13. The objective lens actuator according to claim 3, wherein a viscoelastic material surrounding the linear spring is formed by secondary molding in contact with a side wall of a portion of the fixing member for fixing the linear spring. 14. A frame-shaped fixing member that fixes each of a plurality of linear spring members at two points, and a lens holding member that does not come into contact with the fixing member is formed at an intermediate portion of the fixing member. Manufacture of an objective lens actuator in which one of the linear spring member between the lens holding member and the fixing member is cut off after the necessary accessory parts are attached and the lens holding member is cantilevered. Method. 15. A frame-shaped fixing member for fixing each of a plurality of continuous linear spring members at two points, and a lens holding member which is not in contact with the fixing member in an intermediate portion of the fixing member. A method of manufacturing an objective lens actuator formed on a substrate. 16. The method for manufacturing an objective lens actuator according to claim 14, wherein the lens holding member and the fixing member are formed by molding. 17. The method for manufacturing an objective lens actuator according to claim 16, wherein a magnet is simultaneously molded on the lens holding member. 18. The lens holding member is cantilevered by cutting one of the linear spring members between the lens holding member and the holding member after attaching the necessary accessory parts. A method for manufacturing an objective lens actuator according to any one of 1. 19. The unnecessary linear spring member between the holding members is removed after the necessary accessory parts are attached.
A method of manufacturing an objective lens actuator according to item 1.