JPH0596914U - Objective lens drive - Google Patents

Abstract

(57) [Abstract] [Purpose] Achieves accurate focus control and tracking control without causing resonance during driving, with good response even at high frequency servo currents, and with durability against temperature changes. . A bobbin 36 having an objective lens 33 attached thereto is moved in the optical axis direction of the objective lens 33 by first and second displacement members 41a and 41b arranged in parallel to a direction orthogonal to the optical axis direction of the objective lens 33. A support member 4 which is displaceably supported and is positioned between the first and second displacement members 41a and 41b and supports the first and second displacement members 41a and 41b.
The third elastic member 43 having the hinge portion 46 integrally provided on the one side surface of 0 is rotatably supported in the direction orthogonal to the optical axis direction of the objective lens 33.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention irradiates an optical recording medium such as an optical disc for recording information signals such as audio signals and video signals with a light beam to reproduce the information signals recorded on the optical recording medium, or the optical recording medium. The present invention relates to an objective lens driving device used in an optical pickup device of a recording and / or reproducing device for recording an information signal.

[0002]

[Prior Art]

 2. Description of the Related Art Conventionally, a recording and / or reproducing apparatus such as an optical disc player that records and / or reproduces an information signal on an optical recording medium using a light beam such as a laser beam irradiates the optical recording medium with the light beam. At the same time, an optical pickup device for detecting the returning light beam from the optical recording medium is used.

In this optical pickup device, a light beam emitted from a light source such as a semiconductor laser is accurately focused on a signal recording surface of an optical disc which is rotated at a high speed, and a recording track of the optical disc is accurately recorded. In order to perform tracking, the objective lens for focusing the light beam on the signal recording surface of the optical disc is driven and displaced in the focusing direction parallel to the optical axis and in the tracking direction orthogonal to the optical axis. An objective lens driving device for performing the above is provided.

In the optical pickup device used in the recording and / or reproducing device, an objective lens is placed on an optical system block containing a semiconductor laser in a direction parallel to the optical axis and a direction orthogonal to the optical axis. It is constructed by mounting an objective lens driving device which performs tracking and focusing control by driving and displacing in two orthogonal directions.

As this objective lens driving device, a device configured as shown in FIGS. 10 and 11 is used. The objective lens driving device shown in FIGS. 10 and 11 is curved in an arc shape on a mounting substrate 1 made of a high magnetic permeability material such as soft iron that constitutes a yoke of a magnetic circuit portion and is a mounting portion to an optical system block. The pair of fan-shaped first outer peripheral side yokes 22 and the pair of inner peripheral side yokes 3 and 3 which are formed are arranged at a predetermined interval so as to form a magnetic gap and face each other. Focusing magnets 4 and 4 are arranged below the side yokes 2 and 2, and a pair of second outer peripheral yokes 5 and 5 are erected so as to be positioned between the outer peripheral yokes 2 and 2. The tracking magnets 6 and 6 are bonded and compounded on the facing surface to form the magnetic circuit section 7.

A spindle 8 is erected on the mounting substrate 1 having the magnetic circuit portion 7 as described above so as to be located at the center of the magnetic circuit portion 7. A cylindrical bobbin 11 having an objective lens 10 held by a lens barrel 9 spaced from the axis, that is, mounted at an eccentric position is rotated around the support shaft 8 via a cylindrical boss portion provided at the axis. It is movably displaced and supported so as to be slidable in the axial direction of the support shaft 8. In this way, the bobbin 11 supported by the support shaft 8 is elastically displaceable so that the optical axis of the objective lens 10 and the optical axis of the optical system block coincide with the tracking direction at the neutral point in the inoperative position. It is held by an elastic holding member 12 made of a rubber material or the like. The elastic holding member 12 is attached by bonding the L-shaped bent base end portion onto the attachment substrate 1. On the other hand, a support pin 13 is vertically attached to the bobbin 11 at a position symmetrical with respect to the objective lens 10 about the support shaft 8. The bobbin 11 is held at the neutral point as described above by fitting and supporting the lower end portion of the support pin 13 in the fitting hole 14 formed in the holding portion of the elastic holding member 12.

As described above, on the outer peripheral surface of the bobbin 11 supported by the support shaft 8 and the elastic holding member 12, the bobbin 11 is slidably displaced in the axial direction to drive the objective lens 10 in the focusing direction. A tracking drive coil 16 is provided which rotationally displaces the drive coil 15 and the bobbin 11 in the axial direction to rotationally drive the objective lens 10 in the tracking direction. The focusing drive coil 15 is wound so as to generate a driving force for driving the bobbin 11 in the axial direction of the support shaft 8 in combination with the direction of the magnetic field of the focusing magnets 4 and 4, and the tracking drive coil 15 is wound. 16 is wound so as to generate a driving force for driving the bobbin 11 in the direction around the axis of the support shaft 8 in combination with the directions of the magnetic fields of the tracking magnets 6 and 6.

On the lower surface side of the mounting substrate 1, when the objective lens driving device is mounted on the optical block, the optical axis of the objective lens 10 and the optical axis of the light beam passing through the optical system block may coincide with each other. As described above, the ring-shaped positioning adjustment member 17 for adjusting and positioning the mounting position of the objective lens driving device with respect to the optical block is mounted by the screw 18. The positioning adjustment member 17 is eccentrically attached to the support shaft 8 and is fitted into the positioning recess of the optical system block when the objective lens driving device is attached to the optical system block. By rotationally adjusting the positioning adjustment member in the positioning recess, the alignment between the objective lens and the optical axis of the light beam can be achieved.

In the objective lens driving device configured as described above, the servo current corresponding to the error detection output in the focusing direction and the tracking direction, which is obtained by detecting the returning light beam reflected from the optical disk surface, is supplied to each drive coil. 15 and 16 are selectively supplied to drive the bobbin 11 in the axial direction and the axial direction of the support shaft 8 to move and displace the objective lens 10 in the focusing direction and the tracking direction so that the objective lens 10 is aligned with the signal recording surface of the optical disc. The beam spot of the focused light beam is controlled so as to accurately follow and match the recording track of the optical disc.

[0010]

[Problems to be solved by the device]

 In the objective lens driving device configured as described above, the bobbin 11 having the objective lens 10 mounted at the eccentric position is slidably rotated about the support shaft 8 provided at the shaft center. As it is made, it does not have a fixed support point. Therefore, when the bobbin 11 is driven and displaced in the focusing direction and the tracking direction, resonance may occur, and the objective lens 10 cannot be displaced and displaced according to the error detection output in the focusing direction and the tracking direction. There is a possibility that focusing on the signal recording surface of the optical disc and tracking scanning of the recording track cannot be performed.

Further, since the bobbin 11 is slidably displaced in the axial direction of the support shaft 8, it is impossible to realize a smooth movement displacement in the axial direction of 8 which causes so-called stick slip during driving.

Further, since the optical axis of the objective lens and the optical axis of the light beam are accurately aligned, the supporting shaft 8 for supporting the bobbin 11 needs to be mounted with high accuracy, and the bobbin 11 is loose against the supporting shaft 8. In order to smoothly move without supporting, the dimensional accuracy of the shaft diameter of the support shaft 8 and the hole diameter of the insertion hole through which the support shaft 8 is inserted needs to be processed with high accuracy, and the processing is extremely difficult.

Further, in the objective lens driving device, a positioning member 17 is mounted on the lower surface of the mounting substrate 1 in order to position the mounting position on the optical block. The positioning member 17 and the bobbin 11 are mounted on the mounting substrate. Since it is necessary to attach from two directions with the 1 being sandwiched, the assembly process becomes complicated.

Therefore, the present invention does not cause resonance at the time of driving, has good responsiveness even to a high frequency servo current, has durability against temperature change, and has accurate focus control and tracking control. It is an object of the present invention to provide an objective lens driving device that can be performed.

Another object of the present invention is to provide an objective lens driving device that can reduce the number of parts, can be easily assembled, and can be downsized.

[0016]

[Means for Solving the Problems]

 In order to achieve the above-mentioned object, the objective lens driving device according to the present invention is provided at a position facing a bobbin to which an object lens is attached and a magnet fixed to the substrate of the bobbin. And a coil to which a drive current for driving the bobbin is supplied in the optical axis direction of the objective lens and in a direction orthogonal to the optical axis direction and above the substrate so as to be parallel to the direction orthogonal to the optical axis direction of the objective lens. And a pair of first and second displacement members for supporting the bobbin at one end side thereof so as to be displaceable in the optical axis direction of the objective lens, and a hinge portion. A third displacing member that rotatably supports the bobbin in a direction orthogonal to the optical axis direction of the objective lens, and the other end sides of the first and second displacing members are mounted above and below the one direction side, respectively. And a support member integrally provided with the third displacement member on the side surfaces of the first and second displacement members on the mounting direction side, and the third displacement member is provided with the first displacement member. Is disposed between the displacing member and the second displacing member so as to be parallel to the optical axis direction of the objective lens.

[0017]

[Action]

 In the objective lens driving device according to the present invention, when a servo signal in the focusing direction for driving the objective lens in a direction parallel to the optical axis of the objective lens is supplied to the coil, the bobbin to which the objective lens is attached is moved to the objective lens driving device. A pair of first and second displacement members arranged in parallel to each other in the direction orthogonal to the optical axis direction are displaced to drive and displace in a direction parallel to the optical axis of the objective lens.

When a servo signal in the tracking direction for driving the objective lens in the direction orthogonal to the optical axis is supplied to the coil, the bobbin is moved around the hinge portion provided on the third displacement member. The lens is driven and displaced in the direction orthogonal to the optical axis of the lens.

[0019]

【Example】

 Hereinafter, a specific embodiment of the present invention will be described with reference to the drawings. As shown in FIGS. 1 and 2, the objective lens driving device according to the present invention serves as a mounting portion to an optical system block (not shown) in which a semiconductor laser as a light source for emitting a light beam and other optical parts are built. First and second yokes 22 and 23 having a substantially U-shape forming a magnetic circuit portion are mounted on the mounting substrate 21 so as to face each other. These yokes 22 and 23 are fitted on the connecting portions 22a and 23a side into the positioning grooves 24 provided on the mounting substrate 21, and the fitting recesses 25 and 26 provided on the lower surfaces of the connecting portions 22a and 23a are fitted. The positioning projections 27, 27 projectingly provided in the positioning groove 24 are fitted and mounted (see FIG. 3), and the mounting direction and the mounting position with respect to the mounting board 21 are positioned and fixed. Magnets 28, 28 are disposed in contact with the inner surfaces of the rising pieces 22b, 23b located outside the respective yokes 22, 23.

A light beam emitted from a semiconductor laser incorporated in the optical system block is transmitted through the mounting substrate 21 so as to be positioned in the center between the first and second yokes 22 and 23. A light window 29 is opened. Further, mounting tongue pieces 30, 30 serving as fixing portions to the optical system block are formed on both sides of the mounting board 21. These mounting tongues 30 and 30 are provided with screw insertion holes 31 and 31, and the mounting base plate 21 serves as an optical system block by fixing screws 32 and 32 which are inserted through the screw insertion holes 31 and 31, respectively. Fixed.

The objective lens 33, which is arranged so as to face the optical disc that is the optical recording medium and focuses the beam spot of the light beam on the signal recording surface of the optical disc, has a cylindrical shape with a flange portion 34 provided on the outer circumference. It is attached to a bobbin 36 having a rectangular shape through the lens barrel 35 of. The bobbin 36 is made of synthetic resin, and has a fitting hole 37 formed in the center thereof, into which the lens cylinder 35 is tightly fitted. Then, the lens barrel 35 is attached by fitting the lower end side thereof into the fitting hole 37. On the outer peripheral surface of the bobbin 36, a focusing drive coil 38 for obtaining a driving force for driving and displacing the objective lens 33 in a focusing direction, which is a direction parallel to the optical axis of the objective lens 33, and the objective lens 33 are provided. Four tracking drive coils 39 are provided so as to oppose the magnets 28, 28, respectively, for obtaining a driving force for driving and displacing the optical disc in the radial direction of the optical disc in a direction orthogonal to the optical axis of the lens 33. There is.

The focusing drive coil 38 is arranged in the circumferential direction of the bobbin 36 so as to generate a driving force for driving the objective lens 33 in the focusing direction in cooperation with the magnetizing directions of the magnets 28, 28. Each of the tracking drive coils 39 is wound in a square shape so as to generate a driving force for driving the objective lens 33 in the tracking direction in cooperation with the magnetizing directions of the magnets 28, 28. It is provided across each corner portion of 36.

The bobbin 36 to which the objective lens 33 is attached and the focusing and tracking drive coils 38 and 39 are provided as described above is based on the support member 40 fixed to the mounting substrate 21 via the second yoke 23. It is supported by a first leaf spring 41a and a second leaf spring 41b that form a pair of first and second displacement members that are fixedly attached at their end sides. The support member 40 to which the first and second leaf springs 41a and 41b are fixed is formed by molding synthetic resin or the like, and has a leaf spring attachment portion 42 having plate-like upper and lower end surfaces 42a and 42b parallel to each other. And a side piece 42c of the leaf spring mounting portion 42 facing the second yoke 23, which is continuous in the height direction of the leaf spring mounting portion 42 to form a third displacement member. 43 is projected. As shown in FIG. 2, a fitting piece 45 is integrally formed on the tip side of the continuous piece 43. The fitting piece 45 is fitted between a pair of L-shaped holding pieces 44, 44 provided on opposite sides of the outer side surface of the rising piece to which the magnets 28 of the second yoke 23 are joined. By being combined, they are attached and supported by the second yoke 23.

The supporting member 40 thus mounted and supported on the second yoke 23 is separated from the mounting substrate 21, and is mounted on the mounting substrate 21 via the second yoke 23 fixed to the mounting substrate 21. Fixed. The continuous piece 43 of the support member 40 is provided with a hinge portion 46 formed by thinning a part of the continuous piece 43 so as to be continuous in the height direction. By providing the hinge portion 46 in this way, the objective lens 33 attached to the bobbin 36 can be displaced in the direction orthogonal to the optical axis with the hinge portion 46 as the center.

The first and second leaf springs 41a, 41b arranged in parallel with each other are provided at the base end portions 41a, 41a on the upper and lower end surfaces 42a, 42b of the leaf spring mounting portion 42 of the supporting member 40, respectively. Can be fixedly installed. These base end portions 41a, 41a are provided with fitting holes 48 for fitting with fitting projections 47 projecting from the upper and lower end surfaces 42a, 42b of the leaf spring mounting portion 42 which are parallel to each other. There is. The leaf springs 41, 41 are attached by fitting the fitting holes 48 into the fitting protrusions 47. At this time, the fitting protrusion 47 is heated and crushed, so that the first and second leaf springs 41a and 41b are prevented from coming off from the leaf spring mounting portion 42 and fixed. The pair of first and second leaf springs 41a and 41b thus mounted are parallel to each other and to the surface of the mounting substrate 21.

The second yoke 23 faces the central portion of the pair of first and second leaf springs 41 a and 41 b when attached to the leaf spring attachment portion 42, and an opening 49 for adjusting the elastic force. Is provided.

Then, the bobbin 36 has an upper surface 51 and a lower surface 51 which are planes orthogonal to the optical axis of the objective lens 33 by bobbin mounting portions 50, 50 provided on the tip ends of the pair of first and second leaf springs 41a, 41b. , 52 are clamped and attached. The bobbin mounting portions 50, 50 are respectively provided with a through hole 53 facing the objective lens 33 mounted on the bobbin 36 and a through hole 54 facing the optical window 29 opened on the mounting substrate 21. Around the perforations 53 and 54, there are formed fitting holes 56 into which the fitting protrusions 55 formed on the upper and lower surfaces 51 and 52 of the bobbin 36 fit. In the bobbin 36, the fitting protrusions 55 are fitted into the fitting holes 56, and the fitting protrusions 55 are crushed to prevent them from coming off. It is supported and fixed to the bobbin mounting portions 50, 50 of 41b.

Further, the bobbin 36 has inner rising pieces 22 c, 23 c facing the rising pieces 22 b, 23 b to which the magnets 28, 28 of the first and second yokes 22, 23 are joined. The yoke insertion holes 57 and 58 to be inserted are bored, and the rising pieces 22c and 23c on the inner side of the yokes 22 and 23 are inserted and fitted when supported by the first and second plate blades 41a and 41b. To meet. The focusing and tracking drive coils 38 and 39 provided on the bobbin 36 maintain a predetermined magnetic gap in the gap between the magnets 28 and 28 and the inward rising pieces 22c and 23c of the yokes 22 and 23, respectively. Supported.

The lens barrel 35 holding the objective lens 33 attached to the bobbin 36 is fitted into the fitting hole 37 while the bobbin 36 is supported by the first and second leaf springs 41a and 41b. The flange portion 34 is attached by being locked to the smooth surface of the first leaf spring 41a, and the objective lens 33 is positioned in the optical axis direction.

In driving the objective lens configured as described above, when a driving current is supplied to the focusing drive coil 38, a magnetic action is generated from the direction of the current flowing in the coil 38 and the direction of the magnetic flux from the magnet 28. A driving force in the arrow F direction in FIG. 1 is generated, and the bobbin 36 is driven in the same direction. At this time, moments in directions opposite to each other are applied to the pair of parallel first and second leaf springs 41a and 41b supporting the bobbin 36, but the leaf springs 41a and 41b have the same compliance. If one is used, the moments cancel each other and move while maintaining the parallel state, and move the bobbin 36 in the direction parallel to the optical axis direction of the objective lens 33. Then, the focus control of the objective lens 33 that focuses the light beam on the signal recording surface of the optical disc is performed.

When a drive current is supplied to the tracking drive coil 39, the direction of the arrow T in FIG. 1 is generated by a magnetic action from the direction of the current flowing in the coil 39 and the direction of the magnetic flux from the magnet 28. Is generated, and the bobbin 36 is driven in the same direction around the hinge portion 46 of the supporting member 40 that supports the bobbin 36. Then, the objective lens 33 is moved in a direction orthogonal to the optical axis direction parallel to the signal recording surface of the optical disc, and tracking control is performed.

In the embodiment described above, the support member 40 is mounted by fitting the fitting piece 45 between the holding pieces 44, 44 provided on the second yoke 23. 4, the fitting piece 45 may be attached to the outer rising surface of the second yoke 23 by an adhesive or the like as shown in FIG.

Further, in the above-described embodiment, the support member 40 is fixed to the mounting board 21 via the second yoke 23, but as shown in the embodiments described below, the support member 40 is erected on the mounting board 21. You may make it attach via a shaft.

Hereinafter, an embodiment will be described in which the support member 40 is attached by using the support shaft 60 that is erected on the attachment substrate 21. The same parts as those in the above embodiment are designated by the same reference numerals and detailed description thereof will be omitted.

In the objective lens driving device shown in FIGS. 5 and 6, the support shaft 40 for fixing the support member 40 is planted on the mounting substrate 21 to which the first and second yokes 22 and 23 are mounted. The support shaft 60 is located on the outer side of the second yoke 23 constituting the magnetic circuit portion and is planted. The supporting member 40 fixed to the mounting substrate 21 via the support shaft 60 is a pair of plates for supporting the bobbin 36 on which the objective lens 33 is mounted as shown in FIGS. 7, 8 and 9. A plate-shaped plate spring mounting portion 42 having upper and lower end surfaces 42a and 42b parallel to each other, to which base end portions 41a and 41a of the springs 41 and 41 are fixed, respectively, and a second yoke 23 of the plate spring mounting portion 42. And a fixing portion 62 having a support shaft fitting hole 61 provided through a continuous piece portion 43 that is provided on one side surface so as to intersect directly in the height direction.

The continuous piece 43 is provided at a central position of the leaf spring mounting portion 42, and is provided with a hinge portion 46 which is continuous in the height direction and is partially thinned. The optical axis of the object lens 33 is aligned with the optical axis of the light beam transmitted from the optical system block at the position eccentric to the support shaft fitting hole 61 on the lower end surface of the fixing portion 62. An engagement pin 66 that engages with an engagement recess 65 provided in the rotation adjustment member 64 of the optical axis alignment mechanism 63 that performs adjustment is provided in a protruding manner.

The support member 40 to which the pair of first and second leaf springs 41 a and 41 b supporting the bobbin 36 to which the objective lens 33 is attached is fixed has a support fitting hole 61 formed in the fixing portion 62. It is press-fitted to the support shaft 60 via the and fixed to the mounting substrate 21.

Further, on the mounting substrate 21, the optical axis alignment mechanism 63 for aligning the optical axis of the light beam with the objective lens 33 is provided as described above. In this optical axis adjusting mechanism 63, a through hole 68 provided at a position eccentric to a fitting recess 67 that fits into a flange portion 60a formed at the base end portion of the support shaft 60 is screwed into the mounting substrate 21. The rotation adjusting member 64 is inserted through the fixing screw 69 and is eccentrically rotated with respect to the support shaft 60. An engaging concave portion 65 is provided at one end of the rotation adjusting member 64 facing the through hole 68, and an engaging pin 66 protruding from the supporting portion 40 is engaged with the engaging concave portion 65. Further, a gear portion 70 is formed on the outer peripheral surface of the rotation adjusting member 64. Then, as shown in FIG. 10, when the gear portion 70 is rotated by the adjusting driver D, the supporting member 40 is rotated around the supporting shaft 60. The object lens 33 attached to the bobbin 36 supported by the pair of first and second leaf springs 41a and 41b on the support member 40 is rotated in the direction of arrow A in FIG. The optical axis is aligned with the optical axis of the emitted light beam. Then, when the optical axis is aligned, the fixing screw 69 is tightened to fix the rotation adjusting member 64 to the mounting substrate 21, so that the objective lens 33 and the optical axis of the light beam are accurately aligned to drive the objective lens. The device is configured.

In the driving of the objective lens configured as described above, even if the hinge portion 46 has a variation in processing accuracy and the objective range 33 and the optical axis of the light beam are deviated, the processing of the hinge portion 46 is performed. It is possible to adjust the optical axis with high accuracy by absorbing the variation in accuracy.

In the above embodiment, the support member 40 is press-fitted and attached to the support shaft 60, but a retaining ring is fitted to the tip of the support shaft 60 to prevent the support member 40 from coming off. May be.

Further, instead of the support shaft 60, a long screw may be inserted into the support shaft fitting hole 61 formed in the fixing portion 62, and the support member 40 may be attached by this screw.

Furthermore, the processing accuracy of the hinge portion 46 provided on the support member 40 is sufficiently obtained, and the pair of first and second plate blades 41a and 41b for supporting the bobbin 36 to which the objective lens 33 is attached are provided. The optical axis alignment mechanism 63 need not be provided as long as the optical axis alignment between the objective lens 33 and the light beam can be achieved only by fixing the support member 40 fixed to the support shaft 60.

[0043]

[Effect of the device]

 As described above, in the objective lens driving device according to the present invention, the bobbin to which the objective lens is attached can be moved in the direction parallel to the optical axis of the objective lens by the first and second displacement members arranged in parallel with each other. The objective lens can be moved accurately in a direction parallel to the optical axis direction without causing tilting of the optical axis, and smooth movement is realized. Furthermore, since the bobbin is rotatably supported by the third displacement member provided with the hinge portion in the direction orthogonal to the optical axis of the objective lens, resonance is less likely to occur during driving and stable. It is possible to realize the tracking operation described above.

Particularly, the first and second displacement members that support the bobbin so as to be displaceable in the optical axis direction of the objective are made to face each other and are parallel to each other in the same direction, and are attached to and supported by the support member. A third displacing member that rotatably supports the bin in a direction orthogonal to the optical axis direction of the objective lens is disposed between the first displacing member and the second displacing member. Therefore, the space for disposing each displacement member can be saved, and the miniaturization of the device itself can be easily achieved.

Further, a third displacing member is integrally provided on one side surface of the support member to which the other ends of the first and second displacing members are attached, and is positioned between the first and second displacing members. Since the objective lens is arranged in such a manner that the radius of rotation when the objective lens is rotationally displaced in the direction orthogonal to the optical axis direction can be reduced, the apparatus itself can be further downsized.

Furthermore, since the first and second displacement members are extended from the support member in parallel with each other in the same direction, the expansion and contraction directions and the expansion and contraction amounts due to temperature changes are substantially the same, and therefore the first and second displacement members are the same. And the tilt of the optical axis of the objective lens attached to the bobbin supported by the second displacement member and the deviation of the optical axis are prevented, and further, the positional deviation between the magnet and the coil of the bobbin is prevented. The displacement of the objective lens with high accuracy can be performed.

[Brief description of drawings]

FIG. 1 is a perspective view showing an embodiment of an objective lens driving device according to the present invention.

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

FIG. 3 is a side sectional view of the objective lens driving device.

FIG. 4 is a perspective view showing another example of a mounting state of the support member on the yoke.

FIG. 5 is a perspective view showing another embodiment of the present invention.

FIG. 6 is a perspective view showing an assembled state of another embodiment of the present invention.

FIG. 7 is a front view showing a supporting member used in another embodiment of the present invention.

FIG. 8 is a plan view of the support member.

FIG. 9 is a side view of the support member.

FIG. 10 is a plan view showing an optical axis position adjustment state of an objective lens according to another embodiment of the present invention.

FIG. 11 is a perspective view showing a conventional objective lens driving device.

FIG. 12 is a side sectional view of the conventional objective lens driving device.

[Explanation of symbols]

 21 Mounting Substrate 22 First Yoke 23 Second Yoke 28 Magnet 33 Objective Lens 36 Bobbin 38 Focusing Drive Coil 39 Tracking Drive Coil 40 Supporting Member 41a First Displacement Member First Leaf Spring 41b Second Displacement Member Second leaf spring 43 that is a continuous displacement piece portion that is a third displacement member 45 fitting piece 46 hinge portion

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Kenji Shintani Kenji Shintani 6-735 Kita-Shinagawa, Shinagawa-ku, Tokyo Sony Corporation

Claims (1)

[Scope of utility model registration request] 1. A bobbin to which an objective lens is attached, and a bobbin provided at a position facing a magnet fixed to a substrate of the bobbin, the bobbin extending in an optical axis direction of the objective lens and a direction orthogonal to the optical axis direction. A coil to which a drive current is supplied, and the coil is disposed above the substrate so as to be parallel to the direction orthogonal to the optical axis direction of the objective lens, and the bobbin is attached to the objective lens in the optical axis direction at one end side. A pair of first and second displacing members that are displaceably supported and a hinge portion are provided, and the bobbin can be rotated around the hinge portion in a direction orthogonal to the optical axis direction of the objective lens. And a third displacement member supported on the first and second displacement members, and the other end sides of the first and second displacement members are vertically attached from the one direction side, respectively.
And a support member integrally provided with the third displacement member on the side surface of the displacement member on the mounting direction side, the third displacement member including the first displacement member and the second displacement member.
Objective lens driving device, which is located between the displacing member and the displacing member and is parallel to the optical axis of the objective lens.