JP2000011441A - Optical head driving unit and optical pickup device using it, optical device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To compose an object lens so that it can be fixedly held on a holder without using an adhesive in an optical head driving device such as an object lens driving device, etc. SOLUTION: An object lens 2 is fixedly held on a holder 3 by forming projecting parts 9, 9 at the bottom part of the outer peripheral surface of the object lens 2, mounting this object lens 2 at a predetermined position of a lens holding plane on the holder 3 with the bottom face of the object lens over the projecting parts 9, 9 abutted thereon, and elastically holding the projecting parts 9, 9 abutted on the holder 3 by a spring material 17 as a non-adhesive tightening means 16.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical head provided in an optical disk recording and / or reproducing apparatus as an optical disk apparatus using an optical disk, a magneto-optical disk, or a magneto-optical disk recording / reproducing apparatus. The present invention relates to an optical head driving device for driving an optical head of the device in a vertical direction and a horizontal direction with respect to a signal recording surface of an optical recording medium, an optical pickup device using the same, and an optical device.

[0002]

2. Description of the Related Art Conventionally, an optical pickup device as an optical head device is provided alone in an optical disk recording and / or reproducing device as an optical disk device, and a recording and reproducing device for a recordable and reproducible magneto-optical disk. Are provided as an optical magnetic head mechanism in combination with a magnetic head device as an overwrite head.

In an optical disk recording and / or reproducing apparatus, a light source such as a semiconductor laser and a light beam emitted from the light source are guided and focused on a signal recording surface of an optical disk as an optical recording medium. It comprises an objective lens as an optical head, and optical components such as a grating lens and a beam splitter, and converges a light beam emitted from a light source onto a signal recording surface of an optical disc to irradiate the signal beam. The information signal recorded on the signal recording surface is read by detecting the light beam reflected by the surface by the photodetector.

[0004] An optical disk as an optical recording medium is held at a central portion by a turntable attached to a spindle motor and rotated in a disk player apparatus as an optical disk recording and / or reproducing apparatus provided with an optical pickup device. And rotated. In this disc player device, the optical pickup device is disposed in such a manner that an objective lens, which is an optical head, faces a signal recording surface of an optical disc to be rotated. The pickup device is supported so as to be able to move over the inner and outer circumferences of the optical disk.

[0005] When the optical disc is rotated, the optical pickup device causes the information signal recorded on the signal recording surface of the optical disc along a substantially concentric spirally formed recording track. Are read along this recording track.

By the way, when the optical disc is rotated, the recording track is positioned at the center of curvature of the recording track.
Due to the eccentricity of the optical disc with respect to the rotation center of the optical disc by the spindle motor, the optical disc periodically reciprocates in the radial direction of the optical disc at the reading position by the optical pickup device. Also, when this optical disc is rotated,
The signal recording surface periodically reciprocates in a direction perpendicular to the signal recording surface at a reading position by the optical pickup device due to an error in flatness of the disk substrate of the optical disk, that is, distortion.

[0007] In order to cope with such eccentricity and so-called surface runout of the optical disc, the optical pickup device is provided with an objective lens driving device (biaxial actuator) as an optical head driving device. The objective lens driving device supports the objective lens so as to be movable in an optical axis direction (focus direction) of the objective lens and a direction perpendicular to the optical axis (tracking direction), that is, vertically and horizontally with respect to the disk surface of the optical disk. are doing.

This objective lens driving device detects a signal (a focus error signal) that detects a shift amount (distance) between a focus point of a light beam by an objective lens and a recording track in a direction perpendicular and horizontal to a signal recording surface of an optical disc. And a tracking error signal) to move the objective lens.

An objective lens driving device (biaxial actuator) for supporting the objective lens so as to be movable.
Specifically, a coil bobbin around which a focus coil and a tracking coil are wound is attached to a lens holder that holds an objective lens, and this coil bobbin is formed upright from an actuator substrate, and a shaft is attached to a yoke to which a magnet is joined. The lens holder is vertically rotatably inserted into a support fixed to the actuator substrate by four spring wires as suspensions substantially parallel to the vertical and horizontal directions. It is configured to be supported movably in the direction and the lateral direction.

As described above, when the objective lens is moved by the objective lens driving device, the focal point of the light beam by the objective lens always follows the periodic movement of the recording track, and is always at the recording track. It will be formed on top.

[0011]

In the above-described objective lens driving device, which is an optical head driving device, an objective lens is attached to a lens holder provided with a coil bobbin on which a focus coil and a tracking coil are wound by using an adhesive (mainly an adhesive). In this state, the lens holder is supported on the substrate movably in the vertical and horizontal directions by four spring wires as a suspension.

As described above, an adhesive (mainly an ultraviolet curing adhesive) is used for fixing the objective lens to the lens holder. Therefore, the adhesive is hardened and the adhesive is applied to the objective lens. Optical distortion and its variation are apt to occur due to inflow, and decrease in adhesive strength due to deterioration of the adhesive,
Insufficient adhesive strength may occur due to a malfunction during the bonding operation.

In order to suppress the optical distortion and the like due to the adhesion of the objective lens, a relatively soft adhesive is required even after curing. However, such an adhesive hardly has a sufficient adhesive strength, and the material of the objective lens itself is difficult. Therefore, there was a problem that it was difficult to obtain adhesive strength.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and has as its object to provide an optical head driving device in which an objective lens as an optical head is fixed to a holder without using an adhesive.

[0015]

To achieve the above object, the present invention provides an objective lens for converging a light beam emitted from a light source on a signal recording surface of an optical recording medium with respect to the signal recording surface. An optical head driving device capable of being driven in a vertical direction and a horizontal direction, wherein a projection is provided on an outer peripheral surface of an objective lens, and the objective lens is fixed to a holder holding the objective lens at the projection by non-adhesive fastening means. It is configured so that

In the above configuration, it is preferable that the protrusion is formed in a horizontal protruding shape on the outer peripheral surface of the objective lens in a diametrical direction.

In the above construction, the non-adhesive fastening means is formed of a spring material fixed to the holder, and the spring material elastically presses the projection of the objective lens to fix the objective lens to the holder. Things.

In the above structure, the non-adhesive fastening means may be constituted by a caulking member protruding from the holder, and caulking the projection of the objective lens by the caulking member to fix the objective lens to the holder. It is.

In the above arrangement, the projection of the objective lens is welded to the holder by ultrasonic welding means as a non-adhesive fastening means, and the objective lens is fixed to the holder.

In the above construction, as the non-adhesive fastening means, a soldering portion is formed on the projection of the objective lens and the surface of the holder corresponding to the projection, and the projection is fixed to the holder by soldering. The lens can be configured to be fixed to the holder.

In the optical head driving device according to the present invention thus configured, the objective lens as the optical head is fixed to the holder without using an adhesive, and the fixing strength is stabilized. Also, the fixation of this objective lens to the holder
The effect on the optical characteristics is reduced and the optical performance is stabilized by performing the processing through the projection provided at a distance from the optical surface of the objective lens.

Further, as the non-adhesive fastening means for fixing the objective lens to the holder via the projection, a spring material, a caulking member, an ultrasonic welding means, and a soldering means can be applied, so that the objective lens can be fixed to the holder. It can be done reliably.

An optical pickup device can be constituted by using the optical head driving device constituted as described above, and an optical device such as an optical disk device can be constituted.

[0024]

Embodiments of the present invention will be described below with reference to the drawings.

In this embodiment, an optical head driving device according to the present invention is configured as a driving device for an objective lens as an optical head that reads an information signal from an optical disk using an optical disk as an optical recording medium. It is.

FIGS. 1 to 3 show a first embodiment of the present invention, in which reference numeral 1 denotes an objective lens driving device as an optical head driving device according to the first embodiment. The arrow a indicates the forward direction and the arrow b indicates the rear direction. The objective lens driving device 1 is generally similar to a known objective lens driving device (biaxial actuator), in which the objective lens 2 is held and fixed in the first half of a holder 3 that holds the objective lens 2 and the focus coil is mounted in the second half. 4 and a tracking coil 5 are wound. The holder 3 is supported on a support 6 via a suspension 7 so as to be swingable in a vertical direction and a horizontal direction, and the focus coil 4 and the tracking coil 5 are provided on the apparatus body side. It is configured to correspond to the magnetic circuit 8 provided.

In the first embodiment, the projecting portion 9 is formed on the outer peripheral surface of the lower end portion of the objective lens 2 horizontally in the diameter direction, that is, symmetrically in the direction orthogonal to the optical axis. , 9 are formed, and the projections 9, 9 are located away from the optical surface (lens surface) 2a of the objective lens 2, and it is preferable that the interval is as large as possible. The projections 9 on both sides from the lower end of the objective lens 2 to the lens holding surface of the front half 3 a of the holder 3 for holding the objective lens 2.
9 is formed with a lens fitting portion 10 into which the lower half side is fitted, and penetrates through the central portion of the lens fitting portion 10 in the optical axis direction of the objective lens 2 (see FIG. 2). The rear half portion 3b is formed in a cylindrical shape having a central opening portion 12 penetrating in parallel to the axial direction of the light conducting opening 11 of the lens fitting portion 10, and a coil winding portion 13 is provided on the outer peripheral portion with a bobbin. It is formed in a shape.

At substantially the center of the holder 3, a yoke insertion opening 14, which will be described later, is formed corresponding to the center opening 12 at a required interval. In the illustrated example, suspension receiving portions 15a, 15b, 15c, and 15d that receive the suspension 7 vertically oppose each other on both sides of the insertion opening 14 in both extending directions and on both sides of the front lower end of the coil winding portion 13. Is formed.

The focus coil 4 is wound around the coil winding portion 13 of the holder 3 in a direction perpendicular to the axial direction of the center opening 12, that is, horizontally, over the entire peripheral surface. A pair of tracking coils 5 and 5 wound in a rectangular shape in opposite directions to each other are fixed to the front surface side opposite to the yoke insertion opening 14.

The holding and fixing of the objective lens 2 to the holder 3 thus formed is performed by the non-adhesive fastening means 16 without using an adhesive. That is, the objective lens 2 is fitted to the lens fitting portion 10 formed in the front half 3a of the holder 3 from the lower end to the lower half of the side projections 9 and 9 so that the optical axis direction of the light conducting opening 11 is Holding spring 1 fixedly engaged with holder 3 in a state where it is positioned so as to coincide with the axial direction.
The objective lens 2 is fixed to a predetermined portion of the holder 3 by elastically pressing the projections 9, 9 toward the holder 3 by 7.

As described above, in the first embodiment, the holding spring 17 for fixing the objective lens 2 to the holder 3 is
A wire spring that is elastically expanded and contracted is used. The wire-shaped holding spring 17 has both ends fixed to both sides of the front half 3a of the holder 3 behind the lens fitting portion 10 to fit the outer periphery of the objective lens 2 fitted to the lens fitting portion 10 as described above. The central portion of the objective lens 3 is elastically stretched and hooked on a hook portion 18 formed in a protruding manner at the center of the front end of the front half portion 3a of the holder 3 in a state where the surface side is wound. The projections 9 are elastically pressed down, and the objective lens 2 is held and fixed to the holder 3 as described above.

In the above configuration, the objective lens 2
May be formed in only one direction,
Also in this case, the objective lens 2 can be held and fixed to the holder 3 as described above. Further, the holding spring 17 may be formed by a leaf spring without being limited to the wire spring. In this case, the holding spring 17 is formed in a substantially U shape by press working or the like.

As described above, the holder 3 holding and fixing the objective lens 2 has the suspension receiving portions 15a, 15b, 15c,
The front ends of the suspension wires 19a, 19b, 19c, and 19d as the suspension 7 are fixed to 15d, and the rear ends of the four suspension wires 19a to 19d are fixed to the support 6, respectively, so that the vertical direction (focus direction) is achieved. And is supported so as to swing in the horizontal direction (tracking direction).

The suspension wires 19a to 19d
Is approximately parallel to the top and bottom of the support 6 and is left and right (both sides)
Are fixed in an open state in a substantially C-shape, and both ends of the focus coil 4 and both ends of the tracking coil 5 are connected and also serve as lead wires of the coils 4 and 5.

The magnetic circuit 8 is provided on the substrate side,
The yoke 20 includes a pair of front and rear rising yoke pieces 20a and 20b, and a magnet 21 fixed to the rear yoke piece 20b. The front yoke piece 20 a of the yoke 20 of the magnetic circuit 8 is inserted into the yoke insertion opening 14 of the holder 3, and the rear yoke piece 20 b to which the magnet 21 is fixed is the central opening 12 which is a hollow part of the coil winding part 13. And the magnet 21 is inserted correspondingly.

In the objective lens driving device 1 of the first embodiment configured as described above, the focus coil 4,
When a current is applied to the tracking coil 5, a vertical (focus direction) and horizontal (tracking direction) force acts on the holder 3 by the magnetic flux of the magnetic circuit 8 in accordance with the direction of the current, and the objective lens 2 moves in the required direction. Driven.

In the objective lens driving device 1 of the first embodiment configured as described above, the objective lens 2 is held and fixed to the holder 3 without using an adhesive, so that the above-described bonding is achieved. Of optical distortion and its variation due to adhesive curing of adhesive, adhesion of optical distortion and its variation due to adhesive flowing in, and adhesion due to adhesive deterioration in adhesive fixing using an adhesive (mainly an ultraviolet curing adhesive) Problems such as a decrease in force are eliminated.

The fastening position for holding and fixing the objective lens 2 to the holder 3 is determined by the optical surface (lens surface) 2a.
Protrusions 9, 9 are provided at more distant portions, and these portions are fastened by elastic pressing with a holding spring 17, so that even if this portion is deformed by the fastening, the optical surface (lens surface) 2a of the objective lens 2 is The influence on the optical characteristics is minimized, and the stabilization of the optical performance, the stabilization of the fixing strength, and the like can be achieved. The fixing of the objective lens 2 to the holder 3
Since the bonding operation using an adhesive is not required, the number of operation steps is reduced, the workability is improved, and the equipment can be simplified to reduce the cost.

An optical pickup device 22 as shown in FIG. 3 is constituted by using the objective lens driving device 1 of the first embodiment having the above-described structure. The optical pickup device 22 includes a box-shaped slide base 23 serving as a base.
The support 6 for supporting the objective lens driving device 1 through the suspension 7 and the yoke 2 of the magnetic circuit 8 therein.
0 is fixed to the bottom side of the slide base 23 so as to be built-in.

A light emitting / receiving element 24 for generating a light beam on the slide base 23 and receiving and detecting the reflected beam from the disk.
The optical path of this optical system is conducted to the objective lens 2 side exposed on the surface side of the slide base 23. On one wall surface side of the slide base 23, an insertion bearing portion 25 for a feed screw shaft is provided,
A guide portion 26 having a substantially U-shaped guide groove 26a parallel to the axial direction of the insertion bearing portion 25 is formed on the outer surface side of the other wall surface.

In the optical pickup device 22 configured as described above, the objective lens driving device 1 can improve the optical performance and reduce the cost by stabilizing the optical performance and reducing the cost as described above. .

The optical pickup device 2 shown in FIG.
For example, the disc drive device 31 of the disc player shown in FIGS. The disk drive device 31 includes an optical pickup device 22 as an optical block on a chassis 32.
And a disk rotation drive mechanism 36 in which a disk table 35 is mounted on a rotation shaft 34 of a spindle motor 33.

In the optical pickup device 22, a feed screw shaft 37, which is rotatably supported in a horizontal direction in the direction of a disk rotation drive mechanism 36, is inserted through one side of a chassis 32 into a bearing portion 25 of a slide base 23. The guide portion 26 is screwed to a screw engaging member (not shown) mounted in the slide base 23, while the guide portion 26 is mounted on the other side of the chassis 32 in parallel with the feed screw shaft 37. The shaft 38 is slidably engaged with the shaft 38 in the axial direction. Also, feed screw shaft 3
7 is rotatably driven by transmitting the driving force of a motor 40 as a feed motor via a gear reduction mechanism 39 on the base end side.

By the rotation of the feed screw shaft 37 in the forward and reverse directions, the optical pickup device 22 moves toward and away from the disk rotation drive mechanism 36, that is, the signal recording surface of the optical disk chucked on the disk table. The information signal which has been moved in the radial direction from the inner circumference to the outer circumference and recorded is read out.

In the disk drive device 31 as the optical disk device thus configured, the optical performance of the objective lens drive device 1 is stabilized by using the optical pickup device 22 using the objective lens drive device 1 described above. And cost reduction, it is possible to improve optical performance and reduce cost.

FIGS. 6 and 7 show a second embodiment. The schematic configuration of an objective lens driving device as an optical head driving device according to the second embodiment is the same as that of the first embodiment. Is similar to that of the objective lens driving device, only the main parts are shown, and the same members are denoted by the same reference numerals and detailed description thereof will be omitted.

The objective lens driving device 41 of the second embodiment uses an adhesive for the objective lens 2 formed of a resin material such as an acrylic resin and the like for the holder 3 formed of a thermoplastic resin material. No adhesive fastening means 16
It is configured to be held and fixed by heat staking. That is, in the second embodiment,
Non-adhesive fastening means on the lens holding surface of the front half 3a of the holder 3, facing the front and rear surfaces of the projecting projections 9, 9 formed horizontally in the diameter direction on the outer peripheral surface of the lower end of the objective lens 2. 16
The protruding portion 42 is formed so as to protrude with a large height according to the thickness of the protruding portions 9 and 9.

The holding and fixing of the objective lens 2 to the holder 3 by the caulking projection 42 as the non-adhesive fastening means 16
The objective lens 2 is mounted on the surface of the lens holding portion of the holder 3 by inserting the protruding projections 9, 9 between the front and rear caulking projections 42, and holding the objective lens 2 in the optical axis direction of the holder 3. Positioning is performed so as to coincide with the direction of the central axis of the light conducting opening (see FIG. 2) formed on the surface. In this state, caulking protrusion 42
By crimping the distal end 42a of the projection to the upper surface side of the projections 9, 9 in a bent shape.

As shown in FIG. 7, the tip 42a of the caulking projection 42 is pressed by the heat caulking of the caulking projection 42 so as to bite into the upper surfaces of the projections 9 and 9 of the objective lens 2. Thereby, the objective lens 2 is brought into close contact with the holder 3 and is securely held and fixed.

In this case, even if the projections 9 and 9 of the objective lens 2 are deformed due to the heat caulking of the caulking projection 42 of the holder 3, the caulking portions of the projections 9 and 9 will not Since the position is distant from the surface (lens surface) 2a, the influence on the optical characteristics of the objective lens 2 can be minimized.

Also in the objective lens driving device 41 of the second embodiment, the objective lens 2 is held and fixed to the holder 3 without using an adhesive. The above-mentioned problems caused by the above are solved, stabilization of the optical performance, stabilization of the fixing strength, etc. become possible.In addition, the number of working steps is reduced, the workability is improved, and the equipment can be simplified to reduce the cost. Will be possible.

In the second embodiment,
Although the case where the caulking projection 42 is formed integrally with the holder 3 formed of a resin material is shown in the figure, the caulking projection 4
The holder 2 may be formed of a resin of a different material from the holder 3 and implanted in the holder 3, or may be formed of metal. Also in the second embodiment, the projection 9 formed on the objective lens 2 may be formed in only one direction. In this case, the objective lens 2 is held and fixed to the holder 3 as described above. can do.

FIGS. 8 to 10 show a third embodiment. The schematic configuration of an objective lens driving device as an optical head driving device according to the third embodiment is also the same as that of the first embodiment. Since it is the same as the objective lens driving device, only the main parts are shown, and the same members are denoted by the same reference numerals and detailed description is omitted.

The objective lens driving device 51 of the third embodiment uses an adhesive for the objective lens 2 formed of a resin material such as an acrylic resin or the like for the holder 3 formed of a thermoplastic resin material. No adhesive fastening means 16
And is configured to be held and fixed by ultrasonic fusion. That is, in the third embodiment, a protruding piece-like projection 9 formed on the outer surface of the lower end of the objective lens 2 horizontally in the diametrical direction on the lens holding portion surface of the front half 3 a of the holder 3. The holding projections 52 are formed as non-adhesive fastening means 16 so as to face the front and rear surfaces of the holding projections 9 at a required height, and each holding projection 52 has an inclined surface 52a formed at the lower end on the inner surface side.

The holding and fixing of the objective lens 2 with respect to the holder 3 by the holding projection 52 as the non-adhesive fastening means 16 is performed by mounting the objective lens 2 on the lens holding surface of the holder 3 and the projecting projections 9 and 9 in front and rear. Between the holding projections 52 of
The front and rear corner portions 9a, 9a on the lower surface side of the projections 9, 9 are inclined to the inclined surfaces 52a, 52 on the inner surface side of the front and rear holding projections 52, 52.
The objective lens 2 is positioned in such a manner that the optical axis direction of the objective lens 2 coincides with the central axis direction of a light conducting opening (see FIG. 2) formed in the lens holding surface of the holder 3.
In this state, an ultrasonic wave is applied to the projections 9, 9 by an ultrasonic generator, so that both front and rear corners 9 of the projections 9, 9 are formed.
a, 9a and inclined surfaces 52a, 52a of holding projections 52, 52
The objective lens 2 is brought into close contact with the holder 3 and is securely held and fixed.

In this case, even if the heating portions of the projections 9 and 9 of the objective lens 2 are deformed, the heating portions of the projections 9 and 9 are located at positions separated from the optical surface (lens surface) 2 a of the objective lens 2. Therefore, the influence on the optical characteristics of the objective lens 2 is minimized.

In the objective lens driving device 51 of the third embodiment, the objective lens 2 is held and fixed to the holder 3 without using an adhesive. The above-mentioned problems caused by the above are solved, stabilization of the optical performance, stabilization of the fixing strength, etc. become possible.In addition, the number of working steps is reduced, the workability is improved, and the equipment can be simplified to reduce the cost. Will be possible.

Incidentally, in the third embodiment,
An inclined surface 5 serving as an abutting portion with the projections 9, 9 of the objective lens 2 is provided on the inner surface side of the holding projections 52, 52 formed on the holder 3.
2a and 52a are formed. The inclined surface forms a lens fitting portion 10 in the holder 3 as shown in the first embodiment, and the projection of the objective lens 2 of the lens fitting portion 10 is formed. It may be formed partially on the front and rear inner surfaces of the portion where the parts 9 and 9 are fitted. Also in the third embodiment,
The projection 9 formed on the objective lens 2 may be formed in only one direction. In this case, the objective lens 2 can be held and fixed to the holder 3 as described above.

FIGS. 11 and 12 show a fourth embodiment. The schematic structure of an objective lens driving device as an optical head driving device according to the fourth embodiment is also the same as that of the first embodiment. Since it is the same as the lens driving device, only the main parts are shown, and the same members are denoted by the same reference numerals and detailed description is omitted.

In the objective lens driving device 61 of the fourth embodiment, the objective lens 2 formed of a resin material such as an acrylic resin is soldered to the holder 3 as the non-adhesive fastening means 16 without using an adhesive. It is configured to be held and fixed by attachment. That is, in the fourth embodiment, a protruding piece-like projection 9, which is formed diametrically horizontally on the outer peripheral surface of the lower end of the objective lens 2, on the lens holding surface of the front half 3a of the holder 3, 9, a solderable board 62 constituting a part of the non-adhesive fastening means 16 is arranged and fixed facing the lower surface side of the projection 9, and the length of the board 62 is larger than the width dimension of the projections 9, 9 in the front-rear direction. It is formed to the required width in dimensions. On the other hand, a solderable plating wire 63 that forms another part of the non-adhesive fastening means 16 on the projections 9, 9 of the objective lens 2 corresponds to the substrate 62 and has a winding width smaller than the width of the substrate 62. It is wound with.

As described above, the holding and fixing of the objective lens 2 with respect to the holder 3 by the substrate 62 and the plating wire 63 as the non-adhesive fastening means 16 are performed by mounting the objective lens 2 on the lens holding surface of the holder 3 and the projections 9 and 9. Wound plated wire 6
3 is placed in contact with the substrate 62 fixed to the holder 3, and the direction of the optical axis of the objective lens 2 is aligned with the direction of the center axis of the light conducting opening (see FIG. 2) formed in the lens holding surface of the holder 3. Position so that they match. In this state, soldering is performed between the plating wire 63 and the substrate 62 on the holder 3 side with the low-temperature solder 64 on the front and rear surfaces of the projections 9 and 9 as shown in FIG. Thereby, the objective lens 2 is brought into close contact with the holder 3 and is securely held and fixed.

In this case, the projections 9 of the objective lens 2 are separated from the optical surface (lens surface) 2a of the objective lens 2 even if the soldered portion formed by winding the plating wire 63 is deformed. Since this is the position, the influence on the optical characteristics of the objective lens 2 is minimized.

In the objective lens driving device 61 of the fourth embodiment, the objective lens 2 is held and fixed to the holder 3 without using an adhesive. The above-mentioned problems that occur are solved, and stabilization of optical performance, stabilization of fixing strength, and the like can be performed.

In the fourth embodiment,
As the solderable board 62 fixed to the holder 3 side, a fixing plate for soldering and fixing the tip of the suspension wire supporting the holder 3 can be formed in an extended manner.
A printed wiring board can be used. Further, a solderable portion may be formed on the projections 9, 9 of the objective lens 2 by forming a metal plate which can be soldered in a band shape and winding it in place of the plating wire 63.

In order to wind the plating wire 63 as a soldering portion on the projections 9 and 9 of the objective lens 2 as described above, a winding device used when winding the focus coil on the holder 3 is used. Can be used, so that the production equipment is simplified. Also, in the fourth embodiment, the projection 9 formed on the objective lens 2 may be formed in only one direction. In this case as well, the objective lens 2 is held and fixed to the holder 3 as described above. can do.

The embodiment of the present invention has been described above.
The present invention is not limited to this embodiment, but can be variously modified without departing from the gist of the present invention.

For example, the shape and the like of each member of the objective lens driving device as the optical head driving device can be arbitrarily changed, and a suspension having a leaf spring shape, a resin hinge structure or the like can be used. Things. Also,
The formation and configuration of the slide base of the optical pickup device can be arbitrarily changed, and a feed screw shaft is used as a movement feed mechanism of the optical pickup device and a movement feed mechanism of the optical pickup device of the disk drive device as the optical disk device. It is possible to use a feed mechanism such as a pinion rack or a linear motor type slide feed mechanism without being limited to the one used.

The present invention can be applied to a recording / reproducing device such as a magneto-optical disk.

[0069]

As described above, in the optical head driving device according to the present invention, the projection is provided on the outer peripheral surface of the objective lens, and the objective lens is not adhered to the holder on the outer peripheral surface of the holder holding the objective lens. The objective lens can be held and fixed to the holder without using an adhesive because it is configured to be fixed by the fastening means, and the adhesive strength is reduced due to the deterioration of the adhesive, etc. Without insufficient force, the fixing strength is stabilized and the optical performance is also stabilized, so that the reliability is improved.

Moreover, 2 due to the adhesion of the adhesive to other members
The following defects are prevented and the yield is improved.Furthermore, the work efficiency can be improved and the number of work equipment can be reduced by eliminating the work of irradiating ultraviolet rays for bonding work and adhesives.
Cost can be reduced.

Further, as means for non-adhesive fastening of the projection of the objective lens, simple means such as fastening with a spring material, fastening with a caulking member, ultrasonic welding, and soldering can be applied, and workability is remarkably improved. .

Further, by using the optical head driving device of the present invention for the optical pickup device and the optical device, the optical performance is stabilized and the reliability is improved.

[Brief description of the drawings]

FIG. 1 shows a first example of an objective lens driving device to which the present invention is applied.
It is an exploded perspective view of an example.

FIG. 2 is an enlarged sectional view taken along line AA in FIG.

FIG. 3 is a perspective view of an example of an optical pickup device including the objective lens driving device shown in FIG.

FIG. 4 is a plan view of an example of a disk drive device provided with the optical pickup device shown in FIG.

FIG. 5 is a bottom view of the disk drive device shown in FIG.

FIG. 6 shows a second example of the objective lens driving device to which the present invention is applied.
It is a perspective view of the important section of an example.

FIG. 7 is an enlarged sectional view taken along line BB in FIG. 6;

FIG. 8 shows a third example of the objective lens driving device to which the present invention is applied.
It is a perspective view of the important section of an example.

FIG. 9 is a cross-sectional view of a state before fixing of a part in FIG. 8;

FIG. 10 is an enlarged sectional view taken along line CC in FIG. 8;

FIG. 11 is a perspective view of a main part of a fourth example of an objective lens driving device to which the present invention is applied.

FIG. 12 is an enlarged sectional view taken along line DD in FIG. 11;

[Explanation of symbols]

1, 41, 51, 61 Objective lens drive, 2
Objective lens, 2a ‥‥ optical surface, 3 ‥‥ holder, 4 ‥‥ focus coil, 5 ‥‥ tracking coil, 7 ‥‥ suspension, 8 ‥‥ magnetic circuit, 9 ‥‥ projection, 10 ‥
{Light conducting opening, 16} Non-adhesive fastening means, 17} Spring material, 22} Optical pickup device, 31} Disk drive device, 42} Caulking projection, 42a} Tip, 52} Holding projection , 52a ‥‥ inclined surface, 62 ‥‥ substrate, 63 ‥‥ plated wire, 64 ‥‥ solder

Continued on the front page F term (reference) 5D117 AA02 CC01 CC04 GG02 HH09 5D118 AA06 AA12 AA20 BA01 BB02 BF02 BF03 DB05 EA02 EF01 EF06 FA11 5D119 AA32 AA35 AA38 BA01 BB05 DA01 DA05 JA44 JC01 JC05 LB05

Claims (8)

[Claims] 1. An optical head driving device for driving an objective lens for condensing a light beam emitted from a light source on a signal recording surface of an optical recording medium in a vertical direction and a horizontal direction with respect to the signal recording surface. An optical head drive, wherein a projection is provided on an outer peripheral surface of the objective lens, and the objective lens is fixed to a holder holding the objective lens at the projection by non-adhesive fastening means. apparatus. 2. The optical head driving device according to claim 1, wherein the projecting portion of the objective lens is formed in a shape of a horizontal protruding piece diametrically opposed to an outer peripheral surface of the objective lens. Characteristic optical head drive. 3. The optical head driving device according to claim 1, wherein the non-adhesive fastening means is made of a spring material fixed to the holder, and the spring material elastically moves the projection of the objective lens. An optical head driving device wherein the objective lens is fixed to the holder. 4. The optical head driving device according to claim 1, wherein the non-adhesive fastening means comprises a caulking member projecting from the holder, and the caulking member caulks and fastens the projection of the objective lens. An optical head driving device, wherein the objective lens is fixed to the holder. 5. The optical head driving device according to claim 1, wherein the projection of the objective lens is welded to the holder by ultrasonic welding means as the non-adhesive fastening means, and the objective lens is mounted on the holder. An optical head driving device characterized by being fixed. 6. The optical head drive device according to claim 1, wherein a soldering portion is formed as the non-adhesive fastening means on the projection of the objective lens and a part surface of the holder corresponding to the projection. An optical head driving device, wherein the projection is soldered to the holder, and the objective lens is fixed to the holder. 7. An optical pickup device using the optical head driving device according to claim 1. 8. An optical device using the optical head driving device according to claim 1.