JP3012772B2 - Objective lens actuator and method of manufacturing the same - Google Patents

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 optical disk-shaped recording / reproducing medium and a method of manufacturing the same.

[0002]

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

Hereinafter, a conventional objective lens actuator will be described 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 using four suspension wires for holding a lens holder, and is widely used at present.

In FIGS. 14 and 15, the objective lens 1 is adhered and fixed to the lens holder 32 on the upper surface and the balance weight 34 is adhered to the lower surface of the lens holder, and soldering for fixing the tip of the suspension wire 39 to both side surfaces by soldering. The substrate 35 is magnetized in the NS direction on the other side surfaces as shown in the figure, and two magnets 3 are bonded and fixed. A support holder 37 is fixed to one end of the base 40, and the support holder 37
, A soldering board 38 for soldering and fixing the other end of the suspension wire 39 is bonded and fixed. The suspension wire 39 is obtained by cutting a linear spring material into a predetermined length. The suspension wire 39 has a small hole 43 of a soldering board 38 made of a printed board, a small hole 44 of the support holder 37 and a small hole 45 of the holder 32. 4 are arranged in parallel, and both ends thereof are connected to a soldering board 35 fixed to the lens holder 32 and a soldering board 38 fixed to the support holder 37 by soldering portions 41 and 42 in FIG. Soldered.

An electromagnetic coil 36 which is opposed to and separates from the magnet 3 and electromagnetically drives the magnet 3 is also fixed at a predetermined position on the base 40, and has an axis indicated by arrows X1-X2 and an axis indicated by arrows Y1-Y2. And two types of windings. FIG. 16 is an arrow view from the arrow H direction in FIG.
Four suspension wires 39 are provided at equal intervals in the vertical and horizontal directions. Then, a cover 46 having an opening 46a is attached to the base 40 by a hook 46b from above the assembled product.

The operation of the conventional objective lens actuator configured as described above will be described below.
Both ends of the suspension wire 39 are fixed, the lens holder 32 side is cantilevered with respect to the support holder 37, and the lens holder 32 is connected to the arrow X1-X2 and the arrow Y1.
It is possible to translate in the −Y2 direction.
When current was passed through two types of windings of the electromagnetic coil 36 about the arrows X1-X2 and those about the arrows Y1-Y2, the coils were magnetized in the NS direction while being opposed to and separated from them. Magnet 3
Arrow X on the magnet 3 due to the electromagnetic force generated between
1-X2, Y1-Y2 driving force is generated to move the lens holder 32 and therefore the objective lens 1 fixed thereto.
Are driven in the directions of arrows X1-X2, Y1-Y2.

As a result, it is possible to move the focal position of the laser beam condensed on the disk (not shown) located above the objective lens through the objective lens 1, such as the surface deflection in the surface direction of the disk and the eccentricity in the radial direction. Recording or reproducing operation of the information signal.

[0008]

However, in the configuration 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 penetrates in order to ensure the accuracy of the parallel movement of the lens holder 32. It is necessary to make the diameter of the wire 44 substantially equal to the diameter of the suspension wire 39 as much as possible. Therefore, the work of inserting the suspension wire 39 is difficult, and the soldering work for fixing both ends thereof is also required to control the strength and the joint length. However, there is a problem in assembling that the method is difficult.

Further, in the above configuration and manufacturing method, the suspension wire 39 is liable to bend or twist,
There is also a performance problem that the attitude accuracy of the objective lens 1 is not stable and hinders the parallel movement of the objective lens.

An object of the present invention is to solve the above-mentioned conventional problems and to provide an objective lens actuator which has a small number of parts, is easy to assemble, and has excellent posture stability.

[0011]

Means for Solving the Problems] les for holding the objective lens
A lens holding member, and a plurality of linear spring members for supporting the lens holding member, and a frame-shaped fixing member for fixing the linear spring member, the lens holding member, the linear and the lens holding member Fixing point with spring member, frame-shaped fixing portion
Material, and the fixing of the frame-shaped fixing member and the linear spring member.
The fixed points are respectively fixed to the lens holding member and the frame-shaped solid.
It has a configuration in which the molding material for the fixed member is integrally molded .

[0012]

The linear spring members are arranged on two upper and lower parallel lines which are opposed to and separated from 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. The spring members facing up, down, left, right, or diagonally of the linear spring members facing each other and spaced apart from each other are arranged so that the bending directions inevitably generated in the material manufacturing thereof are opposite to each other. .

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

[0015]

[0016]

[0017]

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

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

[0019]

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

A coil frame 5 made of a synthetic resin has a winding portion 5a at the center, a covering portion 5b having a projection 5c at one end at both ends thereof, and two coating portions 5b on both outer sides thereof. There are wire winding grooves 5e and 5f, and the housing 1
Positioning fixed holes 5g for firmly fitting and fixing to the positioning fixing pins 10b protruding from the four corners 0 are provided on both lower surfaces. In the winding part 5a, an electromagnetic coil 6 has an arrow X1-X on the winding 6a around the arrow Y1-Y2.
The windings 6b around 2 are wound around one another. The beginning and end of each winding are wound around the wire processing grooves 5e and 5f several times, and the outer edges of the wound wires are fixed by soldering. At this portion, for example, a flexible printed circuit board is brought into contact, and a braking material holding frame 7 made of a transparent synthetic resin for applying a signal current to the electromagnetic coil 6 by soldering protrudes at two places below the housing 10. It has positioning fixing holes 7a at both ends for firmly fitting and fixing to the positioning fixing pins 10c, and has two partition walls 7b inside thereof.

The method of assembling the objective lens actuator of the present embodiment configured as described above will be described below. The other end of the suspension wire 8 molded and fixed to the projections 2a on both side surfaces of the lens holder 2 is molded and fixed to one side wall 10a of the housing 10, and the lens holder 2 is cantilevered by the four suspension wires 8. I have. The two fixed coil frames 5 around which the coils 6 are wound from above the housing 10 are press-fitted symmetrically with the positioning fixed pins 10b of the housing 10 aligned with the positioning fixed holes 5g.

Next, the brake material holding frame 7 is press-fitted from below into the positioning fixing hole 7a in accordance with the positioning fixing pin 10c of the housing 10. The braking member holding frame 7 and the partition wall 7b are fixed to the housing 10 at a fixed position.
The inner wall 10d and the covering portion 5b of the coil frame 5 form a space that surrounds two suspension wires 8 from five sides, so that this space has a liquid, for example, ultraviolet curability mainly containing silicon. A braking material 9 (not shown) is injected and gelled by irradiating ultraviolet rays from the lower surface of the transparent braking material holding frame 7, and an optimal braking effect is obtained when the suspension wire 8 vibrates while supporting the lens holder 2. To have This damping material may be a viscoelastic material such as rubber or elastomer other than the gel material.

Next, the operation of the objective lens actuator according to the first embodiment thus constructed will be described.
An electromagnetic coil 6 having an arrow X1-X2 as an axis and an arrow Y
When a current is applied to each of the windings 6a and 6b centered on 1-Y2 and the two types of windings 6a and 6b, a lens is formed by an electromagnetic force generated between the magnet 3 and the magnet 3 magnetized in the NS direction while being opposed to and separated from the winding. Arrows X1-X are respectively attached to the magnets 3 fixed to the holder 2.
2, a lens holder 2 that is cantilevered by a suspension wire 8 by generating a driving force in the Y1-Y2 direction.
And therefore the objective lens 1 fixed to it with the arrow X
Drive in the 1-X2, Y1-Y2 directions. At this time, the braking material 9 provides an optimal braking effect to the suspension wire 8 that supports the lens holder 2 and vibrates.

This makes it possible to move the focal position of the laser beam condensed on the disc (not shown) located above the drawing through the objective lens 1 with respect to the objective lens, and to obtain the surface deflection and 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 fixing of the housing 10 to the coil frame 5 or the braking member holding frame 7 may be performed by exchanging the positioning fixing pins and the positioning non- fixing holes, instead of the illustrated method. After mutually providing the position regulating members, they may be fixed by bonding or ultrasonic welding.
Although not shown, may be used a cover corresponding to the cover 46 of the conventional example of FIG. 15 as needed, is covered considerable area by the the covering portion 5b of the coil frame 5 projecting 5c order It is not always necessary to use a cover.

The first embodiment of the present invention has been described above, and more specific details for embodying the present invention will be described. FIG. 3 is a plan view showing a state where a lens holder 2 is cantilevered by a suspension wire 10 with respect to a housing 10 according to a second embodiment of the present invention.
FIG. 4 is a front view of the housing 10 as viewed from the direction of arrow B in FIG. In the figure, the lower pair of the suspension wires 8 is narrower than the upper pair of the spaces. The first reason lies in the manufacturing method, and the second reason lies in performance problems. 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 C1-C2 section, and FIG. 5C shows a die section of D1-D2 section. As described above, if the molten molding material is not injected after the suspension wire 8 is firmly held by the upper mold 31 and the lower mold 32 of the mold, the thin suspension wire 8 is bent during molding. In FIG. 5, the suspension wires 8a and 8c and 8b and 8d are not vertically arranged vertically. In order to arrange the molds vertically and hold them firmly with a mold, a side core must be used instead of a simple mold with upper and lower divisions as shown in FIG. 5, and the mold structure becomes complicated. Cost increases. The purpose is to avoid this and simplify the mold structure. The hatched portions in the figure correspond to the lens holder 2 and the housing 10.

The above is a manufacturing problem. This is because the suspension wires 8 are arranged in such an arrangement and the dies 21 and
The solution was to pinch in two, but as a result we accidentally found that such an arrangement had a positive effect on performance. That is, in FIG. 6A, the disk 24 fixed to the turntable 23 is exaggerated and easily hangs down in the direction of arrow E due to gravity. Therefore, the lens holder 2 that irradiates the laser beam from below the disk 24 moves downward from the neutral position. Most of them work in the center. At this time, as shown in FIG. 6B, the operation is most stable when the diagonal points of the four suspension wires 8 vibrating up and down and right and left coincide with the neutral point, but the neutral point is lowered by δ. When used, the lower side of the four suspension wires 8 has a narrower interval and a lower diagonal point by δ as shown in the right diagram of FIG. Becomes

Therefore, when the head is also arranged above the disk 24, the interval between 8a and 8b is set to 8 in FIG.
What is necessary is to make something smaller than the interval between c and 8d and use it upside down.

Next, an example in which this also solves a manufacturing problem and leads to an improvement in performance will be described. FIG. 7 is an explanatory diagram of means for solving the bending of the suspension wire 8. The material of the suspension wire 8 arrives as a hoop material wound on a reel as shown in FIG. Accordingly we discuss slightly core set curl, the When 8mm Figure the length of the portion exposed when incorporated in the objective lens actuator (b)
In this case. Is a perspective view of the <br/> diagram that illustrates this situation (c), arrow view from the direction of arrow F in FIG. (C) is a figure (d). If the bending direction as shown in FIG. 4D is indicated by the arrow on the left in FIG. 4 as the bending direction of the tip with respect to the fixed point, the four suspension wires 8 are replaced.
It as a table specific bending direction shown in FIG. 7 (e) no mode shown in (j)
There is That is, in FIG. 7 (e), the two left-hand parts are curved inward at the tips, and the same applies to the two right-hand parts. Opposite direction of the combination of the <br/> diagram (f) the figure (e), FIG. (G),
(h) a point symmetrical combination, FIG. (i), the combination opposite to (j) is the lateral direction. The upper, lower, left, right, or diagonal suspension wires 8 are arranged so that the directions of curvature are opposite to each other or away from each other, that is, the bending directions of a pair of opposed suspension wires 8 are opposite to each other. In order to prevent the lens holder 2 from being curved and fixed to one side with respect to the fixed point, and to prevent the direction of vibration from being twisted. As shown in parentheses in less preferably figure (f), it may be reversed to to face inwardly each other and left the two right. A great number of combinations can be made by combining such combinations.

Next, when determining the direction of the suspension wire 8 as shown in FIG. 7, if the cross section of the wire is circular, it is difficult to assemble it practically. Therefore Figure 7 hoop material in stock wound in a reel, such as (a), and rolled from the upper and lower as shown in FIG. 8 (a) and cross-section as in FIG. 8 (b). Or further processed wound on a reel as shown in FIG. 8 (d) as a cross-section as in FIG. (C). Then, first, the material, such as in the figure (e)
As shown in FIG. 7 (f), the bending direction is perpendicular to the longitudinal direction of the cross section. For example, when the bending direction is intentionally determined as shown in FIGS. 7 (e) to 7 (j), the direction is determined in the mold. It has excellent features such as being less likely to be twisted than a round shape. This processing may be performed by pressing, but since the processing is intermittent, rolling is preferably performed between two rolls, or processing may be performed by drawing through one or more dies.

Next, the detachment 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, the surface is generally smooth. If the insert is inserted as it is, the pull-out strength is weak, and the molded product may be pulled out by a slight force due to shrinkage or the like, which may cause the posture of the lens holder 2 to change. As a countermeasure, a patent is partially provided as shown in FIG. For this, for example, solder or the like is added to the surface of the suspension wire 8 . In FIG. 2B, a depression is formed by pressing. Alternatively, if a dent is provided , the swelling may occur in the 90-degree direction , but this does not matter. May be performed knurling the entire circumference or a specific surface as shown in FIG. (C). Or it may be roughed by sandblasting or etching as shown in FIG. (D). The above processing may be performed only on the portion to be inserted, or 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. FIG. 10A shows a viscoelastic material 25 formed by secondary molding in contact with a side wall 10a of the housing 10 which is a fixing point of the suspension wire 8 instead of providing the damping material holding frame 7 of FIG. Is formed. FIG. 10 (b)
Shows a mold structure in a G1-G2 cross section in FIG.
As described above, the damping material can be formed by secondary molding instead of the steps of adding parts and pouring and solidifying.

Next, a third embodiment of the present invention will be described. The third embodiment relates to an improvement in the manufacturing method. FIG.
In FIG. 7, the suspension wire 8 penetrates the lens holder 2 and further penetrates the side wall 10d opposite to the side wall 10a of the housing 10 which holds the original fixing point of the suspension wire 8. If the length of the suspension wire 8 is made equal to or slightly shorter than the length of the housing 10, the suspension wire 8 does not protrude from the housing 10. By molding in this manner, the mold 2 of FIG.
The positioning of the suspension wire 8 within the first and second parts 22 becomes easy, and the rigidity of the molded part is high, so that the manufacturing becomes easy. However, since the lens holder 2 cannot be cantilevered if the suspension wire at the portion 8e in the drawing remains, it is sufficient to cut off this portion or unnecessary portions outside or using a laser beam. This cutting can be performed in the state shown in FIG. 11, but if it is cut in this state, it is likely to be deformed in the subsequent assembling work, making it difficult to assemble. If possible, assemble it in the state shown in FIG. If the part is cut, deformation during assembly is less likely to occur and assembly becomes easier.

Although the state shown in FIG. 11 may be formed one by one, a continuous forming process as shown in FIG. 12 can be considered in order to further increase the processing efficiency. In FIG. 12, for example, a suspension wire material 8g processed as shown in FIG. 8 is wound on the reel 26, and the direction of the warp at this time is taken into consideration with reference to FIG. Roller 27
Then, the retaining press shown in FIG. This is not limited to the press, and other retaining methods may be used. Next, the mold 21 is injected into the injection molding machine 29.
Injection molding is continuously performed by using No. 22. The finished product is wound on a take-up reel 30 and separated in a separate step.

If the material of the reel 26 has already been subjected to the retaining process as shown in FIG. 9, the retaining press 28 is unnecessary. If a roll processing machine is provided in front of the retaining press 28, the 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 if the electromagnetic coil 6, the brake material holding frame 7 and the like are incorporated and the brake material is injected and solidified, and the suspension wire is cut continuously, complete continuation is achieved. Automatic processing can be performed.

The case where the housing 10 and the lens holder 2 are processed and assembled by molding via the suspension wire 8 has been described above. However, instead of molding as shown in FIG. Then, the lens holder is moved to the center 2b, the upper and lower 2c, 2d.
The suspension wire 8 is sandwiched between
A similar product can be obtained by bonding or ultrasonic welding. In the illustrated example, the housing 10 and the lens holder 2 are vertically divided, but it is needless to say that the housing 10 and the lens holder 2 can be vertically divided.

Each of the above embodiments may be implemented independently, or may be implemented by combining the parts of each embodiment. Needless to say, the present invention may be implemented by adding a conventionally known example.

[0039]

According to the objective lens actuator of the present invention as described in the foregoing, a lens holding member for holding the objective lens as a main component, and a plurality of linear spring members for supporting the lens holding member, a linear sequence by the fixing member for fixing the spring member, the lens holding member, the lens holding member and the line
Fixing point with frame-shaped spring member, frame-shaped fixing member, and frame-shaped fixing member.
The fixed points of the fixed member and the linear spring
Molded integrally with molding material of holding member and frame-shaped fixing member
It has a molded configuration.

[0040] Also, the upper and lower disposed opposite spaced each other physician linear spring members, the bending direction of the linear spring member facing the lateral or diagonal occurs unavoidably on their preparation other, linear
The spring members are arranged so as to be opposite in each of the opposing directions .

If necessary, the entire surface of the linear spring member or at least the portion enclosed by the lens holding member or the fixing member has a projecting cross section, a depressed cross section, or a rough surface.

Further, in the method of manufacturing an objective lens actuator according to the present invention, a frame-shaped fixing member fixed to each of a plurality of linear spring members at two points and a lens holding member not in contact with the fixing member at an intermediate portion are provided. After forming, or after incorporating necessary accessories , all of the linear spring member between the lens holding member and the frame-shaped fixing member is cut off to allow the lens holding member to be cantilevered. Can be
Take a frame-shaped fixing member for fixing the direction of the frame-shaped fixing member to the intermediate portion to continuously form a lens holding member which does not contact with and two points against further successive plurality of linear spring members In this direction, each of the lens holding member and the frame-shaped fixing member and the linear spring member can be formed by molding.

Therefore, the mounting accuracy of the lens holding member mounted on the frame-shaped fixing member via the linear spring member can be enhanced, and the mounting strength can be increased. Further, bending and twisting of the linear spring member are less likely to occur due to the attachment interval of the linear spring member and the regulation of the bending direction thereof, and the posture of the lens holding member, that is, the objective lens held thereon, is stabilized, and the movement accuracy is improved. .

Further, the configuration and manufacturing method of the present invention greatly reduce the number of parts used, and eliminate the need for inserting a linear spring into a thin hole as in the related art or manual work such as soldering, which has many variations. Since continuous molding is also possible, the fixing work of the linear spring for securing the parallel movement of the lens holding member is facilitated, 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 the 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 in which a lens holder 2 is cantilevered by a suspension wire 10 with respect to a housing 10 according to the second embodiment.

4 is a housing 1 also viewed from the direction of arrow B in FIG.
0 front view

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

FIG. 6A is an explanatory view showing the operation of the lens holder due to the warpage of the disk. FIG. 6B is an explanatory view showing the relationship between the neutral point of the four suspension wires of the lens holder and the operation stable 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 curvature of the suspension wire. (C) An assembled state as an actuator. Perspective view (d) View from arrow F direction in FIG. (C) (e) to (j) Explanatory view of combination of four suspension wires 8 in bending direction

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

FIGS. 9 (a) to 9 (d) are illustrations of a suspension wire material for preventing the same from coming off.

10A and 10B are explanatory views showing another embodiment of the formation of the brake material of the suspension wire. FIG. 10A is a perspective view showing the formed brake material. FIG. 10B is a view showing a mold structure of a cross section taken along line G1-G2 in FIG. Sectional view

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

FIG. 12 is an explanatory view showing a continuous molding process in the production 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 assembling 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.

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

[Explanation of symbols]

 DESCRIPTION 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 Brake material holding frame 7b Partition wall 8 Suspension wire (linear spring member) 8f Cutting part 9 Brake material 10 Housing ( Fixing member) 25 Viscoelastic material

 ────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-4-310637 (JP, A) JP-A-3-150732 (JP, A) JP-A-1-194147 (JP, A)

Claims (5)

(57) [Claims] With a 1. A lens holding member for holding the objective lens, and a plurality of linear spring members for supporting the lens holding member, and a frame-shaped fixing member for fixing the linear spring member, the lens holding Member, the lens holding member and the line
Fixing point with the spring member, the frame-shaped fixing member, and
Fixing points of the frame-shaped fixing member and the linear spring member respectively
Forming the lens holding member and the frame-shaped fixing member
Objective lens actuator molded integrally with material . Wherein the upper and lower opposed spaced apart to arranged the linear spring members together, bending directions of the linear spring member which faces in the lateral or diagonal, opposite each opposing direction of the linear spring member The objective lens actuator according to claim 1, wherein 3. The objective lens actuator according to claim 1, wherein the linear spring member is a linear spring member formed by processing a material having a round cross section and having two surfaces parallel to the upper and lower surfaces. At least part of the portion to be sealed to at least the lens holding member or the fixed member 4. A linear spring member, either substantially symmetrical projecting section or internal concave cross-section axis of the linear spring member 2. The objective lens actuator according to claim 1, wherein the surface of the linear spring member is roughened . 5. A frame-shaped fixing member for fixing each at two points for a plurality of linear spring member according to claim 1, wherein the frame-like in the middle portion of the frame-shaped fixed member Manufacture of an objective lens actuator in which a lens holding member that does not come into contact with a fixing member is continuously formed by molding, and then one of the linear spring members is entirely cut to support the lens holding portion in a cantilever manner. Method.