JP2661581B2 - Objective lens drive - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an audio signal, a video signal and the like.
Light on an optical recording medium such as an optical disk for recording information signals
Irradiates a beam to reproduce the information signal recorded on the optical recording medium.
Recording or recording information signals on an optical recording medium
For optical pickup device of recording and / or reproducing device
The present invention relates to an objective lens driving device. 2. Description of the Related Art Conventionally, a light beam such as a laser beam has been used.
To record and / or reproduce information signals on the optical recording medium
Recording and / or playback devices such as optical disc players
Irradiates an optical recording medium with a light beam and
Optical pickup device for detecting return light beam from medium
Is used. This optical pickup device includes a semiconductor laser.
The light beam emitted from the light source such as the laser is rotated at high speed
Focus on the signal recording surface of the optical disc accurately, and
Optical track to accurately track the recording track of the
Objective lens that focuses the beam onto the signal recording surface of the optical disk
The focusing direction parallel to the optical axis and the optical axis
Pair for driving displacement in the tracking direction perpendicular to
An object lens driving device is provided. [0004] Optics used in recording and / or reproducing apparatus
The pickup device is an optical system with a built-in semiconductor laser.
Place the objective lens on the lock in the direction parallel to the optical axis and the light
Drive displacement in two axes perpendicular to each other in the direction perpendicular to the axis
To control focusing and tracking
It is configured with a lens drive device attached. FIG. 11 shows this objective lens driving device.
And those configured as shown in FIG.
I have. The objective lens drive shown in FIGS. 11 and 12
The device serves as a mounting part for the optical system block and a magnetic circuit.
Made of high magnetic permeability material such as soft iron that constitutes the yoke of the road section
A fan-shaped pair formed in an arc shape on the mounting board 1
The first outer yoke 2, 2 and a pair of inner yoke 3,
3 are opposed to each other to form a magnetic gap.
As shown in FIG. And the outer peripheral side
Focusing magnets 4 and 4 at the bottom of
So that it is located between the outer yokes 2 and 2
Of the pair of second outer peripheral yokes 5, 5 planted in
The tracking magnets 6 and 6 on the surface
This constitutes the magnetic circuit unit 7. [0006] The mounting in which the magnetic circuit portion 7 is configured as described above.
Board 1 so that it is located at the center of the magnetic circuit section 7.
The support shaft 8 is erected. This support shaft 8 has a lens barrel
The objective lens 10 held at 9 is separated from the axis,
That is, the cylindrical bobbin 11 attached to the eccentric position
Rotatably displaceable via a cylindrical boss provided on the shaft center,
Is supported by being slidable in the axial direction of the support shaft 8. Branch
The bobbin 11 supported on the shaft 8 is in the inoperative position.
The optical axis of the objective lens 10 and the optical system block at the neutral point
Elastic displacement so that the optical axis of
Held by an elastic holding member 12 made of a rubber material or the like.
I have. The elastic holding member 12 has a base bent in an L-shape.
The ends are mounted on the mounting substrate 1 by bonding or the like. one
On the other hand, the bobbin 11 has the objective lens 1
Take the support pin 13 vertically at a position symmetrical to 0 so that it hangs down.
It is attached. And the bobbin 11 is provided with the support pin.
The lower end of the elastic member 13 is fitted to the holding portion of the elastic holding member 12.
By fitting and supporting the hole 14,
It is held at the standing point. As described above, the support shaft 8 and the elastic holding member 12
The bobbin 11 supported by the
11 is displaced in the axial direction and the objective lens 10 is focused.
Focusing drive coil 15 for driving in the singing direction
And the bobbin 11 is rotated and displaced in the
A track for rotating the lens 10 in the tracking direction.
A king drive coil 16 is provided. Note that four
The focusing drive coil 15 is provided with a focusing magnet.
In conjunction with the directions of the magnetic fields 4 and 4, the bobbin 11
Wound to produce driving force to drive in axial direction
The tracking drive coil 16 is
The bobbin 11 is supported in conjunction with the direction of the magnetic field of
To generate a driving force for driving the shaft 8 in the direction around the axis.
Wound around. On the lower surface of the mounting board 1, an objective lens
When attaching the lens drive to the optical block,
Optical beam transmitted through the optical axis of the lens 10 and the optical system block
Optical system of the objective lens drive so that the optical axes of the
Link for adjusting and positioning the mounting position on the block
Positioning adjustment member 17 is attached with screws 18
Have been. The positioning adjustment member 17 is
It is mounted eccentrically, and the objective lens drive is
When mounted on the lock, the positioning recess of the optical system block
Part. Positioning adjustment section within this positioning recess
The objective lens and light beam are adjusted by rotating the material.
Are aligned. [0009] The objective lens driving device constructed as described above.
The detector detects the return light beam reflected from the optical disk surface.
Focusing direction and tracking method
Servo current corresponding to the direction error detection output to each drive coil 1
The bobbin 11 is selectively supplied to 5 and 16 so that the bobbin 11 is
The objective lens 1 is driven in the
0 is changed in the focusing and tracking directions.
Light beam focused on the signal recording surface of the optical disc
Beam spot accurately on the recording track of the optical disc
The scanning is controlled so as to follow. [0010] The present invention is constructed as described above.
In the objective lens driving device described above, the objective lens 10 is biased.
The bobbin 11 mounted at the centered position is supported by a support provided at the shaft center.
It is configured to be slid around the shaft 8
And does not have fixed support points. Therefore, Focus
Driving displacement of the bobbin 11 in the tracking and tracking directions
There is a risk that resonance will occur when
Pair according to the error detection output in the
The object lens 10 cannot be moved and displaced, and the light beam
Focus on the signal recording surface of the disc and record track
Tracking may not be performed. The bobbin 11 slides in the axial direction of the support shaft 8.
Because it is displaced, it moves intermittently during driving
Slip occurs and moves smoothly in the axial direction of the spindle 8.
It cannot be moved dynamically. In addition, the objective lens
In order to make the optical axis of the
Mounting accuracy of the support shaft 8 that supports the
Also, the bobbin 11 is smooth without rattling against the support shaft 8.
, The shaft diameter of the support shaft 8 and the insertion of the support shaft 8
It is necessary to process the dimensional accuracy of the insertion hole diameter with high accuracy
Yes, processing is extremely difficult. Further, the objective lens driving device includes:
In order to position the mounting position on the optical block,
A positioning member 17 is attached to the lower surface of the
The positioning member 17 and the bobbin 11 are
It is necessary to attach from two directions across the assembly process
Becomes complicated. Accordingly, the present invention provides a method of generating resonance during driving.
Responsiveness even at high frequency servo currents
Performs accurate and accurate focus control and tracking control
It is an object of the present invention to provide an objective lens driving device that can be obtained.
Furthermore, the present invention reduces the number of parts and makes assembly easier.
It is easy to manage the dimensional accuracy of each component,
The moving parts including the bobbin are downsized, and
In particular, to reduce the height of the objective lens in the optical axis direction
To provide an objective lens driving device that enables
And [0014] The above-mentioned object has been achieved.
Objective lens driving device according to the present invention proposed to realize
The bobbin equipped with the objective lens and the bobbin
Are disposed on the substrate so as to face the outer peripheral surface of the
1st and 2nd magnets provided so as to face the
And oppose the first and second magnets, respectively.
As well as the opening provided on the bobbin.
First and second yoke pieces respectively located in the mouth,
The first and second magnets of the bobbin and the first magnet
Drive current provided between the first yoke and the second yoke piece
The bobbin is supplied with the objective lens
A first coil for driving in a direction parallel to the optical axis of
And the bobbin in a direction orthogonal to the optical axis of the objective lens.
And a second coil for driving the substrate,
It will be parallel to the direction orthogonal to the optical axis direction of the objective lens.
And one end of the objective lens with respect to the optical axis direction.
With the bobbin on the other end of the objective lens.
A pair of first and second movable members that are supported to be displaceable in the optical axis direction.
Position member, and the first and second displacement members are from one side.
These are mounted on top and bottom, respectively,
A hinge part is located on the side of the second displacement member on the mounting direction side.
It is provided on the body, and the bobbin is
A third pivoting direction orthogonal to the optical axis of the objective lens;
A displacement member, and the light of the objective lens at the hinge portion.
The height in the direction parallel to the axis is adjusted by the first displacement member and the second displacement member.
And smaller than the distance between the displacement member and
A third displacement member is connected to the first displacement member and the second displacement member.
Between the optical axis of the objective lens
It is intended to be arranged. The objective lens driving device according to the present invention has first and second objective lens driving devices.
A first magnet which constitutes an electromagnetic driving means together with the second magnet;
And either one of the second coil and the optical axis of the objective lens
Servo signals in the focusing direction driven in parallel directions
No., the bobbin with the objective lens attached
Moves the first and second displacement members to move the objective lens.
It is translated in a direction parallel to the optical axis. In addition, any one of the first and second coils
To the direction perpendicular to the optical axis of the objective lens.
When the control signal for the locking direction is supplied, the bobbin moves
When the third displacement member is displaced around the flange portion,
The moving operation is performed in a direction orthogonal to the optical axis of the objective lens. Preferred embodiments of the present invention will be described below with reference to the accompanying drawings.
I will explain. The objective lens driving device according to the present invention has a
As shown in FIGS. 1 and 2, a light source for emitting a light beam
With built-in semiconductor laser and other optical components
Mounting board for mounting to optical system block not shown
A first and a substantially U-shaped magnetic circuit portion on the
The second yokes 22, 23 are attached to face each other.
These yokes 22, 23 are connected to the connecting portions 22a, 23a.
Fitting into a positioning groove 24 provided in the mounting board 21;
Fitting recesses 25, 2 provided on the lower surfaces of connecting portions 22a, 23a
6 projecting into the positioning groove 24 and positioning projections 27 and 2
7 (see FIG. 3).
Positioning of mounting direction and mounting position with respect to plate 21
Made and fixed. Position outside each yoke 22, 23
The inner surfaces of the rising pieces 22b and 23b
The first and second magnets 28a and 28b are joined and arranged.
You. These first and second magnets 28a, 28b
Are disposed on the mounting board 21 so as to face each other. The mounting board 21 has first and second
The optical system block is located at the center between the yokes 22 and 23.
The light beam emitted from the semiconductor laser built in the laser
A light window 29 for transmitting light is provided. In addition, the mounting base
On both sides of the plate 21, there are provided fixing portions to the optical system block.
Attachment pieces 30, 30 are drilled. These mounting tongues
Screw insertion holes 31, 31 are formed in the pieces 30, 30,
Fixed screws inserted through these screw insertion holes 31, 31
The mounting substrate 21 becomes an optical system block by the
Fixed. An optical disk as an optical recording medium and
Light beam is placed on the signal recording surface of the optical disk
The objective lens 33 for focusing the
4 form a square through a cylindrical lens barrel 35 provided with
It is attached to the bobbin 36. This bobbin 36 is
It is formed of resin, and the lens barrel 35 fits closely at the center.
A fitting hole 37 is formed. The lens barrel 35 is located at the lower end side.
Is fitted to the fitting hole 37 and attached to the bobbin 36.
You. An objective lens 33 is provided on the outer peripheral surface of the bobbin 36.
Focusing in the direction parallel to the optical axis of the object lens 33
Is a first coil that obtains a driving force for driving displacement in a direction.
The focusing drive coil 38 and the objective lens 33
Direction perpendicular to the optical axis of the objective lens 33
First coil for obtaining a driving force for driving displacement in the radial direction of the disc
The four tracking drive coils 39 constituting the
Facing the first and second magnets 28a and 28b, respectively.
It is arranged so that. The focusing drive coil 38
Is the magnetization of the first and second magnets 28a and 28b.
The objective lens 33 in the focusing direction
In the circumferential direction of the bobbin 36 to generate the driving force for driving
And each tracking drive coil 39 is
And the direction of magnetization of the second magnets 28a and 28b.
To drive the objective lens 33 in the tracking direction
Each corner of the bobbin 36 is wound in a rectangular shape to generate a force.
Parts. When the objective lens 33 is mounted as described above,
Focusing and tracking drive coils 38,
The bobbin 36 provided with 39 is provided via the second yoke 23.
To the support member 40 fixed to the mounting board 21
A pair of first and second displacement parts fixedly attached to each other
1st leaf spring 41a and 2nd leaf spring 41 which comprise a material
b. These first and second leaf springs 41
The support member 40 to which the a and 41b are fixed is made of synthetic resin.
The upper and lower plates are formed by molding
A leaf spring mounting portion 42 having end faces 42a and 42b is provided.
The leaf spring mounting portion 42 faces the second yoke 23.
Height direction of the leaf spring mounting portion 42 on one side surface 41c
The connecting piece 43 that constitutes the third displacement member is
Has been established. FIG. 2 shows the distal end side of the connecting piece 43.
As shown, the fitting piece 45 is formed integrally. this
The fitting piece 45 has magnets on both sides of the second yoke 23.
L-shape provided opposite each other on both sides of a rising piece joined with 28
To be fitted between the pair of holding pieces 44
Thus, it is supported by the second yoke 23. The support member 4 supported by the second yoke 23
0 is separated from the mounting board 21 and fixed to the mounting board 21.
Fixed to the mounting board 21 via the second yoke 23
Is determined. The connecting piece 43 of the support member 40 includes
A hinge formed by thinning a part of the continuous piece 43 is formed.
A joint portion 46 is provided continuously in the height direction. this
By providing the hinge portion 46 as described above, the bobbin 36
The attached objective lens 33 is centered on the hinge 46.
, And can be displaced in a direction orthogonal to the optical axis. The connecting piece 43 is shown in FIG.
Thus, the first and second plates are provided on the upper and lower end surfaces 42a and 42b.
Leaf spring attachment part 4 to which springs 41a and 41b are attached
2 is formed smaller than the height. So this
Hinge part formed continuously in the height direction of connecting piece part 43
46 is also formed smaller than the height of the leaf spring mounting portion 42.
ing. Then, the hinge part 46 is located above and below the connecting piece 43.
First and second attached to each end face 42a, 42b
It is formed smaller than the interval between the leaf springs 41a and 41b. Also, the first and the second components arranged in parallel to each other
The second leaf springs 41a and 41b are provided to support the leaf springs of the support member 40.
One end of each of upper and lower end surfaces 42a and 42b of the attaching portion 42
The base end which is the side is fixed and attached. These base ends
The upper and lower ends of the leaf spring mounting portion 42 are parallel to each other.
Fits with fitting projections 47 projecting from 42a and 42b, respectively.
A fitting hole 48 is formed. And each leaf spring 4
1a and 41b allow the fitting hole 48 to be fitted to the fitting projection 47.
Attached. At this time, the fitting protrusion 47 is heated.
Of the first and second leaf springs 41a and 41b.
The leaf spring is fixed so as to prevent it from coming off from the leaf spring mounting part 42.
You. A pair of first and second plates attached in this manner
The springs 41a and 41b are parallel to each other and mounted.
It is parallel to the surface of the substrate 21. A pair of first and second leaf springs 41a, 41
At the center of b, when attached to the leaf spring attachment part 42
Then, the second yoke 23 faces and adjusts the elastic force.
Opening 49 is provided. And the bobbin 36
On the tip side of the pair of first and second leaf springs 41a, 41b
The objective lens 33 is provided by the provided bobbin mounting portions 50, 50.
Upper and lower surfaces 51 and 52 which are planes orthogonal to the optical axis of
Attached. In the bobbin mounting parts 50, 50,
Object lens 33 attached to bobbin 36 respectively faces
Opposed to through-hole 53 and optical window 29 opened in mounting board 21
A through hole 54 is provided. Also, the through holes 53, 54
Around the bobbin 36 on the upper and lower surfaces 51 and 52
A fitting hole 56 into which the fitting protrusion 55 fits is formed.
Then, the bobbin 36 fits each fitting protrusion 55 into each fitting hole 56.
And the fitting projection 55 is crushed to prevent it from falling out.
And attaching the first and second leaf springs 41a and 41b to the bobbin.
The support portions 50 are fixedly supported. The bobbin 36 has a first and a second support.
The first and second magnets 28a, 2 of the
8b is paired with rising pieces 22b and 23b to be joined respectively.
The rising pieces 22c, 23c on the inward side, ie, the first
And a yoke insertion opening 5 through which the second yoke piece is inserted.
7, 58 are drilled. In these openings 57, 58
The bobbin 36 is supported by a pair of leaf springs 41, 41
Sometimes the rising pieces 22c on the inner side of the yokes 22, 23,
23c is inserted. And it is provided on the bobbin 36
Focusing and tracking drive coils 38, 39
Is connected to the first and second magnets 28a and 28b and each yaw.
Between the inner rising pieces 22c, 23c of the ridges 22, 23
Is supported while maintaining a predetermined magnetic gap. The objective lens attached to the bobbin 36
The lens barrel 35 holding the lens 33 holds the bobbin 36 in the first position.
And fitted in a state supported by the second leaf springs 41a and 41b.
The flange portion 34 is fitted into the mating hole 37 and the first plate spring 4
Objective lens attached to the flat surface of 1a
The positioning of 33 in the optical axis direction is performed. Objective lens driving device constructed as described above
Drive current is supplied to the focusing drive coil 38.
The direction of the current flowing through the coil 38 and the first and second
And the direction of the magnetic flux from the second magnets 28a and 28b
A driving force in the direction of arrow F in FIG.
The bobbin 36 is driven in the same direction. At this time, bobbin 3
6 and a pair of first and second leaf springs parallel to each other
Opposite moments act on 41a and 41b
However, a compliance equivalent to these leaf springs 41a and 41b is used.
If you use one that has ances, the above moment is
Move each other while maintaining the parallel state by canceling each other,
Is moved in a direction parallel to the optical axis direction of the objective lens 33.
Let it. Then, a light beam is applied to the signal recording surface of the optical disc.
Focus control of the objective lens 33 to be focused is performed.
You. The tracking drive coil 39 is driven.
When the current is supplied, the current flowing through the coil 39
Direction and from the first and second magnets 28a, 28b
The force in the direction of arrow T in FIG.
Occurs, and the bobbin 36 is supported by the bobbin 36.
Driven in the same direction about the hinge portion 46 of the member 40
You. Then, the objective lens 33 records the signal of the optical disc.
The track is moved in a direction perpendicular to the optical axis direction parallel to the surface.
Control is performed. In the embodiment described above, the support member 40 is
A fitting piece 45 is inserted between the holding pieces 44 provided on the yoke 23.
Although they are fitted and attached, the holding pieces 44, 44
Without providing the fitting piece 45 as shown in FIG.
It is joined to the rising surface on the outer side of the yoke 23 with an adhesive or the like.
You may make it attach. In the above embodiment, the support member 40
Is fixed to the mounting board 21 via the second yoke 23.
However, as shown in the embodiment shown below,
You may make it attach via a supporting shaft which stands. Less than
Bottom, supporting part using the support shaft 60 erected on the mounting board 21
An embodiment in which the member 40 is attached will be described. What
Note that the same reference numerals are used for parts common to the above-described embodiments.
The detailed description is omitted. Objective lens driving device shown in FIGS. 5 and 6
Has the first and second yokes 22 and 23 attached thereto.
A support shaft 60 for fixing the support member 40 is erected on the mounting board 21.
I do. The support shaft 60 is provided with a second support which constitutes a magnetic circuit unit.
The plant is erected on the outer side of the work 23. And the spindle
A support member 40 fixed to the mounting board 21 through the support member 60
The objective lens 33 is, as shown in FIG. 7, FIG. 8 and FIG.
A pair of leaf springs 4 supporting the attached bobbin 36
The base ends 41a, 41a of 1, 41 are fixed respectively.
A plate-like plate having upper and lower end surfaces 42a, 42b parallel to each other
The spring mounting portion 42 and the second
One side facing the yoke 23 so as to be orthogonal to the height direction
Shaft fitting provided via the connecting piece 43 provided on the
And a fixing portion 62 having a hole 61 formed therein. The connecting piece 43 is located inside the leaf spring mounting section 42.
It is provided at the center position, and extends in the height direction,
A thin hinge portion 46 is provided. Ma
In addition, eccentricity with respect to the support shaft fitting hole 61 on the lower end surface side of the fixing portion 62
The optical axis of the objective lens 33 and the optical system block
For adjusting the alignment of the light beam transmitted through the optical axis with the optical axis
Engaging recess 6 provided on rotation adjusting member 64 of shaft aligning mechanism 63
An engagement pin 66 that engages with the projection 5 protrudes. The bobbin 36 to which the objective lens 33 is attached
The pair of supported first and second leaf springs 41a and 41b
The fixed support member 40 includes a support shaft formed in the fixed portion 62.
The mounting substrate 2 is press-fitted into the support shaft 60 through the fitting hole 61.
Fixed to 1. Also, on the mounting board 21, the above-mentioned
Optical axis alignment for aligning the optical axis of the light beam with the objective lens 33
An adjusting mechanism 63 is provided. This optical axis alignment mechanism 63
Fits into a flange 60a formed at the base end of the support shaft 60.
A through-hole provided at a position eccentric to the fitting recess 67
68 is inserted into a fixing screw 69 screwed to the mounting board 21.
And eccentrically rotated with respect to the support shaft 60.
It is constituted by a dynamic adjustment member 64. This rotation adjusting member 6
4 has an engaging recess 65 at one end facing the through hole 68.
Is provided, and an engagement pin 66 protruding from the support portion 40 is engaged.
Let me do. In addition, the outer peripheral surface of the rotation adjusting member 64 has a gear.
A shoulder 70 is formed. And as shown in FIG.
Gear 70 is rotated by adjusting screwdriver D
Then, the support member 40 is rotated about the support shaft 60.
A pair of first and second leaf springs 41 are provided on the support member 40.
a, attached to the bobbin 36 supported by 41b
The objective lens 33 is rotated in the direction of arrow A in FIG.
With the optical axis of the light beam transmitted from the optical system block
Axis alignment is performed. And where the optical axis alignment was done,
Tighten the fixing screw 69 and mount the rotation adjusting member 64
If fixed to 21, the objective lens 33 and the optical axis of the light beam
An exactly matched objective lens drive is constructed. The driving of the objective lens having the above structure is as follows.
If the hinge 46 has variations in processing accuracy,
Even if the optical axis of the light beam is deviated from that of the
Optical axis alignment with high accuracy by absorbing variations in processing accuracy of 46
Can be performed. Note that, in the above-described embodiment,
Then, the support member 40 is press-fitted and
Although a retaining ring is fitted to the tip of the support shaft 60,
You may make it aim at retaining. In place of the support shaft 60, a long screw is fixed.
This screw is inserted through the shaft fitting hole 61
The support member 40 may be attached by using. Sa
In addition, the hinge 46 provided on the support member 40 is added.
The machining accuracy is sufficiently obtained, and the
A pair of first and second leaf springs 41 supporting the bin 36
a, the support member 40 to which 41b is fixed is fixed to the support shaft 60.
Alignment of the optical axis between the objective lens 33 and the light beam
If it is possible, it is not necessary to provide the optical axis alignment mechanism 63.
No. The objective lens drive according to the present invention as described above.
The moving device moves the bobbin on which the objective lens is mounted
The first and second displacement members arranged in parallel to the
Is supported so that it can move in a direction parallel to the optical axis of the lens.
The objective lens without causing the optical axis to tilt.
Can move accurately in a direction parallel to the
Kana movement is realized. In addition, the bobbin has an objective lens
In the direction orthogonal to the optical axis of
Is rotatably supported by the displacement member of
Stable tracking operation with less resonance at times
Can be realized. In particular, change the bobbin in the direction of the optical axis of the objective lens.
First and second displacement members for supporting the first and second displacement members
To be parallel to the same direction.
The bobbin in a direction perpendicular to the optical axis of the objective lens.
A third displacement member movably supported by the first displacement member;
Since it is located and arranged between the second displacement member,
Space saving of the displacement member is achieved, and the size of the device itself is reduced.
Molding is achieved. Moreover, the hinge provided on the third displacement member is provided.
The height in the direction parallel to the optical axis of the objective lens
When formed smaller than the distance between the positioning member and the second displacement member
In both cases, the third displacement member is connected to the first displacement member and the second displacement member.
Located between the displacement member and parallel to the optical axis of the objective lens
Are arranged so that they are flat with the optical axis direction of the objective lens.
The height in the row direction can be reduced. The power supplied to the coil provided on the bobbin is
The bobbin in the optical axis direction of the objective lens
And the driving force for driving in a direction orthogonal to the optical axis direction.
The first and second magnets to be generated are located on the outer periphery of the bobbin.
And the first and second
It is arranged to face each magnet and
First and second positions located in the opening provided in the bobbin.
First and second coils are provided between the two yoke pieces.
The moving parts including the bobbin can be downsized.
And contribute to further downsizing of the device itself.
It is possible to drive with a small drive current
The driving displacement of the objective lens is realized. Further, the third displacement member is connected to the first and second displacement members.
One side of the support member to which the other end of the displacement member is attached
Provided on the body and positioned between the first and second displacement members.
So that it is orthogonal to the optical axis direction of the objective lens.
It is possible to reduce the turning radius when turning in the
Further downsizing of the device itself can be realized. Further, the first and second displacement members include:
Extending from the support member in the same direction parallel to each other
And the direction and amount of expansion and contraction due to temperature changes are almost the same.
The bobbin supported by the first and second displacement members
Of the optical axis of the objective lens attached to the camera or deviation of the optical axis
And the bobbin magnet and coil
Position shift is prevented, and high-precision objective lens drive
Position can be performed.

BRIEF DESCRIPTION OF THE 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 state in which a support member is attached to a 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 support 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. DESCRIPTION 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 Support member 41a First leaf spring 41b serving as a first displacement member Second leaf spring 43 as a second displacement member Continuous piece 45 as a third displacement member Fitting piece 46 Hinge

Claims (1)

(57) [Claims] A bobbin to which an objective lens is attached; first and second magnets disposed on a substrate facing the outer peripheral surface of the bobbin and provided so as to face each other; First and second yoke pieces respectively disposed in the bobbin so as to face the magnets, respectively; and the first and second magnets of the bobbin and the first and second yoke pieces.
A first coil provided between the first and second yoke pieces to drive the bobbin in a direction parallel to the optical axis of the objective lens by supplying a drive current;
And a second coil for driving the bobbin in a direction orthogonal to the optical axis of the objective lens, disposed above the substrate so as to be parallel to a direction orthogonal to the optical axis direction of the objective lens, a pair of first and second displacement members one end to the base end side, the bobbin is displaceably supported in the direction of the optical axis of the objective lens at the other side with respect to the optical axis of the objective lens, The first and second displacement members are mounted vertically above and below the one direction side, and a hinge portion is integrally provided on a side surface of the first and second displacement members in the direction of attachment .
A third displacement member that rotates the bobbin about the hinge in a direction perpendicular to the optical axis of the objective lens, and a height of the hinge in a direction parallel to the optical axis of the objective lens.
The distance between the first displacement member and the second displacement member.
In addition to making the third displacement member upward,
The second displacement member is located between the first displacement member and the second displacement member.
In parallel with the optical axis of the objective lens.
An objective lens driving device according to symptoms.