JPH1049891A - Objective lens driving device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an objective lens driving device which improves follow-up property of objective lens and reflecting mirror at the time of movement in tracking direction and reduces misalignment of optical axis between the objective lens and the reflecting mirror. SOLUTION: In a pick-up block 1, when a focusing force acts on a focusing leaf spring 3 in a focusing direction, the focusing leaf spring 3 is vertically pulled to flex, thus displacing an objective lens 2 in the focusing direction. When a tracking force acts on the focusing leaf spring 3 and a tracking holding member 6 in a tracking direction, a hinge leaf spring 7 flexes in the tracking direction, thus displacing the objective lens 2 in the tracking direction. When the objective lens 2 is displaced in the tracking direction, a reflecting mirror 9 linked to the tracking holding member 6 through a fixed member 12, a cylindrical elastic member 13 and a shaft 11 is affected by the force in the tracking direction, and parallel leaf springs 10 are thus caused to flex in the tracking direction, thereby displacing the reflecting mirror 9 in the tracking direction.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to an objective lens driving device, and more particularly, to an objective lens driving device used for an optical disk drive or the like.

[0002]

2. Description of the Related Art A conventional objective lens driving device used in an optical disk drive includes, for example, a drive mechanism for controlling movement of an objective lens in a focusing direction and controlling movement of a reflection mirror in a tracking direction. There is a two-axis drive type actuator. In this two-axis drive type actuator, the reflection mirror arranged below the objective lens is fixed to the pickup housing. Recently, the cost of the objective lens drive has been reduced,
In order to reduce power consumption, the drive mechanism for moving the pickup in the tracking direction has been changed from a linear motor to a lead screw.

As another objective lens driving device, there is, for example, an "optical control mechanism of an optical disc player" described in Japanese Patent Application Laid-Open No. 58-98848.
In this optical control mechanism, a reflection mirror that reflects laser light to an objective lens is mounted on a block that moves in the tracking direction, and this block includes an elastic member for focusing, an objective lens support member, and an objective lens. Focusing. When the objective lens is displaced in the tracking direction due to the movement of the block in the tracking direction, since the optical axes of the reflection mirror and the objective lens do not shift, it is possible to prevent a decrease in the amount of light incident on the optical system light receiving element, and to achieve a stable operation. Tracking is possible.

[0004]

However, in the case of the lead screw driving method among the above-mentioned conventional objective lens driving devices, the follow-up characteristic when the pickup is moved in the tracking direction is deteriorated. The moving amount of the objective lens is about 4
About 00 μm is required. When the movement amount in the lens tracking direction becomes 400 μm, the optical axis of the objective lens and the incident light (laser light) of the objective lens becomes 400 μm as it is.
m, the return light incident on the light receiving element shifts with respect to the light receiving element dividing line, causing an offset in the tracking error signal or a shift in the optical axis between the reflection mirror and the objective lens. Decreases the data write / read performance of the pickup on the optical disk.

[0005] Further, since a large capacity is desired for the next-generation optical disk, the diameter of the light spot on the disk surface is reduced, that is, the NA (numerical aperture) is increased and the wavelength of laser light is shortened. Also, the track pitch on the disk surface has been reduced. Therefore, in the above-described lead screw drive type objective lens driving device, tracking offset and light amount reduction due to a shift between the objective lens and the optical axis are important problems for next-generation optical disks, and these problems need to be solved. .

In the optical control mechanism of the optical disk player described in the above-mentioned Japanese Patent Application Laid-Open No. 58-98848, a reflection mirror for reflecting laser light to an objective lens is mounted on a block that moves in the tracking direction. The block has a configuration in which an elastic member for focusing, an objective lens support member, and an objective lens are mounted, and thus there is a problem that it is difficult to reduce the size in the height direction. further,
Since the reflection mirror is mounted on the driving member in the tracking direction, the weight of the movable part becomes heavy, and if it is mounted on a high-speed rotating disk drive such as 2x speed or 4x speed,
The power consumption of the drive control unit that drives and controls the pickup is increased.

Further, in the case of such an optical control mechanism for driving the objective lens in two axes, as shown in FIG. 19, when the objective lens A moves in the tracking direction in FIG. 19, the laser light in FIG. Axis B and objective lens optical axis C are Δ
The optical axis shifts by x. As a result, the position of the light spot incident on the light receiving element of the detection system shifts, and an offset occurs in the track error signal, thereby reducing control accuracy. In addition, when the objective lens A moves in the tracking direction, the light amount of the laser beam incident on the objective lens A decreases, and the light amount fluctuates at the time of tracking, thereby performing each data recording / data reproducing operation on the optical disk. The above is a problem.

Accordingly, the first aspect of the present invention provides an objective lens support mechanism for movably supporting an objective lens for condensing and irradiating light on an optical disk surface in a tracking direction and a focusing direction, and for light incident from the tracking direction. And a reflecting mirror supporting mechanism that movably supports in the tracking direction a reflecting mirror that reflects the light in the focusing direction and enters the objective lens in a tracking direction, by linking the objective lens supported by the objective lens supporting mechanism with tracking. When moving in the direction, the reflection mirror supported by the reflection mirror support mechanism is moved in conjunction with the tracking direction, thereby improving the followability of the movement of the reflection mirror in the tracking direction with respect to the movement of the objective lens in the tracking direction. And an objective lens driving device capable of reducing the amount of displacement of the optical axis. It is intended to be subjected.

According to a second aspect of the present invention, the objective lens support mechanism and the reflection mirror support mechanism are linked by a predetermined elastic body, so that the objective lens can be moved in the tracking direction with a simple structure at low cost. It is an object of the present invention to provide an inexpensive objective lens driving device capable of improving the followability of the movement of a reflection mirror in the tracking direction and reducing the amount of deviation of the optical axis.

According to a third aspect of the present invention, the objective lens support mechanism and the reflection mirror support mechanism are linked by a tubular elastic body, and the center line of the tubular elastic body in the cylindrical direction coincides with the tracking direction. An objective lens driving device capable of increasing the elastic constant in the tracking direction and lowering the elastic constant in the focusing direction to improve the followability of the reflecting mirror with respect to the objective lens and reducing the driving current in the focusing direction. It is intended to provide.

According to a fourth aspect of the present invention, the objective lens support mechanism and the reflection mirror support mechanism are provided with a magnetized member such as an iron piece attached to one of them, and the objective lens support mechanism is opposed to the magnetized member at a predetermined interval. By linking the mechanism and the magnetic member attached to the other of the reflection mirror support mechanism with each other, the objective lens and the reflection mirror are moved in the tracking direction in a non-contact manner, and stable against environmental changes such as temperature change, It is an object of the present invention to provide a compact objective lens driving device capable of improving the followability of a reflection mirror with respect to an objective lens and further reducing the shift amount of an optical axis.

According to a fifth aspect of the present invention, there is provided an objective lens supporting mechanism and a reflecting mirror supporting mechanism, the first magnet being attached to one of them and being arranged with its magnetic pole dividing line coincident with the focusing direction, and The other of the lens support mechanism and the reflection mirror support mechanism is attached to the first magnet so as to be opposed to the first magnet at a predetermined interval, and the magnetic pole parting line is disposed so as to coincide with the focusing direction and has the opposite polarity as its polarity. By linking with a second magnet having a polarity opposite to the polarity of the first magnet, in the tracking direction, the followability of the reflecting mirror to the objective lens can be further improved by a strong attractive force, and the focusing direction can be improved. It is an object of the present invention to provide an objective lens driving device that can reduce the driving current of the objective lens.

According to a sixth aspect of the present invention, there is provided a jitter direction adjusting mechanism capable of adjusting a position of a reflecting mirror in a jitter direction orthogonal to both an optical axis of an objective lens and a tracking direction.
Further, by providing the space between the magnetized member and the magnetic member, or the space between the opposed magnets, the attraction force is stabilized, and the followability of the reflecting mirror to the objective lens is further improved. It is an object of the present invention to provide an objective lens driving device capable of performing the following.

[0014]

According to the present invention, there is provided an objective lens driving mechanism for supporting an objective lens for condensing and irradiating light onto an optical disk surface so as to be movable in a tracking direction and a focusing direction. An objective lens driving device, comprising: a reflecting mirror supporting mechanism for reflecting light incident from the tracking direction in the focusing direction and supporting a reflecting mirror incident on the objective lens so as to be movable in the tracking direction. The objective lens support mechanism and the reflection mirror support mechanism are linked by predetermined linking means, and when the objective lens supported by the objective lens support mechanism moves in the tracking direction, the linking means The reflection mirror supported by the reflection mirror support mechanism is moved in cooperation with the tracking direction. By Rukoto, it has achieved the above object.

According to the above construction, the objective lens supporting mechanism for movably supporting the objective lens for condensing and irradiating the light on the optical disk surface in the tracking direction and the focusing direction, and the light incident from the tracking direction in the focusing direction. And a reflecting mirror supporting mechanism for supporting a reflecting mirror movably reflected in the tracking direction in the tracking direction by a linking means, and when the objective lens supported by the objective lens supporting mechanism moves in the tracking direction. Since the reflection mirror supported by the reflection mirror support mechanism is moved in association with the tracking direction, the followability of the movement of the reflection mirror in the tracking direction with respect to the movement of the objective lens in the tracking direction can be improved. The shift amount of the optical axis can be reduced.

In this case, for example, as described in claim 2, the linking means may be an elastic body having a predetermined elasticity attached over the objective lens support mechanism and the reflection mirror support mechanism.

According to the above configuration, since the objective lens support mechanism and the reflection mirror support mechanism are linked by the predetermined elastic body, the objective lens has a simple structure and is inexpensive to reflect the movement of the objective lens in the tracking direction. The followability of the movement of the mirror in the tracking direction can be improved, and the displacement of the optical axis can be reduced at low cost.

Further, for example, as described in claim 3, the elastic body is a tubular elastic body, and the center line of the tubular elastic body in the cylinder direction is arranged in a direction coinciding with the tracking direction. It may be.

According to the above configuration, the objective lens support mechanism and the reflection mirror support mechanism are linked by the tubular elastic body, and the center line of the tubular elastic body in the cylindrical direction is made coincident with the tracking direction. Can be increased, the elastic constant in the focusing direction can be reduced, the followability of the reflecting mirror to the objective lens can be improved, and the driving current in the focusing direction can be reduced.

Further, for example, as set forth in claim 4, the linking means includes a magnetized member such as an iron piece attached to one of the objective lens support mechanism and the reflection mirror support mechanism, and a predetermined magnetized member attached to the magnetized member. A magnetic member attached to the other of the objective lens support mechanism and the reflection mirror support mechanism at a distance from each other may be provided.

According to the above construction, the objective lens support mechanism and the reflection mirror support mechanism are connected to the magnetized member such as an iron piece attached to one of them, and the objective lens support mechanism is opposed to the magnetized member at a predetermined interval. Because it is linked with the magnetic member attached to the other side of the reflection mirror support mechanism, the objective lens and the reflection mirror can be moved in the tracking direction without contact, and stably against environmental changes such as temperature changes, The followability of the reflection mirror to the objective lens can be improved. As a result, the amount of deviation of the optical axis can be further reduced.

Further, for example, as set forth in claim 5, the linking means is attached to one of the objective lens support mechanism and the reflection mirror support mechanism so that a magnetic pole dividing line coincides with the focusing direction. A first magnet provided, and the other of the objective lens support mechanism and the reflection mirror support mechanism, which are mounted opposite to each other at a predetermined distance from the first magnet and whose magnetic pole dividing lines are aligned with the focusing direction. And a second magnet having a polarity opposite to that of the first magnet opposed to the first magnet.

According to the above construction, the objective lens supporting mechanism and the reflecting mirror supporting mechanism are attached to one of them, and the first magnet which is disposed with its magnetic pole dividing line coincident with the focusing direction, and the objective lens supporting mechanism. The other of the mechanism and the reflection mirror support mechanism is mounted opposite to the first magnet at a predetermined interval, and the magnetic pole dividing line is disposed so as to coincide with the focusing direction, and the first magnet is opposite in polarity as its polarity. Since it is linked with the second magnet having a polarity opposite to the polarity of the magnet, in the tracking direction, the followability of the reflecting mirror to the objective lens can be further improved by a strong attractive force, and the focusing direction can be improved. Drive current can be reduced.

Further, for example, as set forth in claim 6, the objective lens driving device can adjust the position of the reflection mirror in a jitter direction orthogonal to both the optical axis of the objective lens and the tracking direction. A jitter direction adjusting mechanism may be further provided.

According to the above configuration, the apparatus further comprises a jitter direction adjusting mechanism capable of adjusting the position of the reflection mirror in a jitter direction orthogonal to both the optical axis of the objective lens and the tracking direction. Or the distance between the magnets facing each other can be adjusted, and these attractive forces can be stabilized, and the followability of the reflecting mirror to the objective lens can be further improved.

[0026]

Preferred embodiments of the present invention will be described below in detail with reference to the accompanying drawings. In addition, although the embodiment described below is a preferred embodiment of the present invention, various technically preferable limitations are added.
The scope of the present invention is not limited to these embodiments unless otherwise specified in the following description. (First Embodiment) FIGS. 1 to 3 are exploded perspective views of a pickup block in an objective lens driving device to which the first embodiment of the objective lens driving device of the present invention is applied.

In FIG. 1, a pickup block 1
Has two focus leaf springs 3 which support the objective lens 2 and are displaced in the focusing direction in the figure, and the two focus leaf springs 3 have holes 3a opened for fixing. It is fixed to the tracking holding member 6 by a fixing pin 5 passed through the hole 3a with the spacer 4 interposed therebetween.

The two focus leaf springs 3 are displaced in the focusing direction indicated by a double-headed arrow in FIG. 1 when a vertical driving force (focusing direction) in FIG. Is done.

The tracking holding member 6 has the structure shown in FIG.
One end of a hinge leaf spring 7 is fixed to the center of the middle front surface, and is connected via this hinge leaf spring 7 to a hinge leaf spring holding member 8 fixed to the other end of the hinge leaf spring 7. . Tracking holding member 6 and focus leaf spring 3
1 is displaced in the tracking direction indicated by a double-headed arrow in FIG. 1 when a force in the left-right direction (tracking direction) in FIG.

That is, the objective lens 2 is displaced by the focus leaf spring 3 in the focusing direction shown by the double-headed arrow in FIG. 1, and is displaced by the hinge leaf spring 7 in the tracking direction shown by the double-headed arrow in FIG.

The reflecting mirror 9 is held by two parallel leaf springs 10 so as to be displaceable in the tracking direction shown in FIG.
Is provided. A cylindrical elastic member (elastic body) 13 fixed by a fixing member 12 is provided on an opposing surface of the tracking holding member 6 opposing the shaft 11, and as shown in FIG. By being inserted into the cylindrical elastic member 13, the reflection mirror 9 is formed.
And the tracking holding member 6 are linked and held.

The two parallel leaf springs 10 for displacing the reflection mirror 9 include a parallel leaf spring fixing member 14 on the side where the reflection mirror 9 is not fixed, and a parallel leaf spring holding member 15 on which the reflection mirror 9 is fixed. Thereby, the parallel gap is set and held, and the side on which the reflection mirror 9 is not fixed is fixed to a pickup case (not shown) by a parallel leaf spring fixing member 14 with screws 14a.

That is, the focus leaf spring 3, the spacer 4, the tracking holding member 6, the hinge leaf spring 7, and the hinge leaf spring holding member 8 support the objective lens 2 movably in the tracking direction and the focusing direction. The parallel leaf spring 10, the parallel leaf spring fixing member 14, and the parallel leaf spring holding member 15 function as a support mechanism 1a, and function as a reflection mirror support mechanism 1b that supports the reflection mirror 9 so as to be movable in the tracking direction as a whole. . The shaft 11, the fixing member 12, and the cylindrical elastic member 13 as a whole
When the objective lens 2 supported by the objective lens supporting mechanism 1a moves in the tracking direction, the reflecting mirror 9 supported by the reflecting mirror supporting mechanism 1b is linked in the tracking direction. It functions as linking means for moving.

Therefore, when the objective lens 2 is displaced in the tracking direction shown in FIG. 1 by the hinge leaf spring 7, the tracking holding member 6 is similarly rotated in the tracking direction and fixed to the tracking holding member 6. Reflection mirror 9 linked by cylindrical elastic member 13
Are also displaced by the same amount in the same tracking direction.

Further, the reflection mirror 9 is used for the cylindrical elastic member 1.
Since the hinge leaf spring 7 is bent and the focus leaf spring 3 and the tracking holding member 6 are displaced in the tracking direction, the parallel leaf spring 10 is also moved in the tracking direction because the hinge leaf spring 7 is bent. The deflection mirror 9 is displaced in the tracking direction.

Next, the operation of the present embodiment will be described. The pickup block 1 has a hinge leaf spring 7 fixed to the tracking holding member 6 and a cylindrical elastic member 13 linked to a shaft 11 provided on the side surface of the reflection mirror 9. Are displaced by the same amount in the tracking direction, and the displacement of the optical axis between the objective lens 2 and the reflection mirror 9 can be reduced.

That is, the pickup block 1 is driven by a focus driving mechanism (not shown) to move the focus plate spring 3
When the focusing force acts in the focusing direction,
The focus leaf spring 3 is deflected by being pulled upward or downward, and the deflection of the focus leaf spring 3 displaces the objective lens 2 in the focusing direction.

When a tracking force is applied to the focus leaf spring 3 and the tracking holding member 6 in the tracking direction by a tracking drive mechanism (not shown), the focus leaf spring 3 and the tracking holding member 6 move rightward or leftward in FIG. , The hinge leaf spring 7 bends, and the hinge leaf spring 7 bends, so that the objective lens 2 is displaced in the tracking direction.

When the objective lens 2 is displaced in the tracking direction, the fixed member 12, the cylindrical elastic member 13, and the reflection mirror 9 linked by the shaft 11 to the tracking holding member 6 receive a force in the tracking direction, and the parallel plate is moved. The spring 10 bends in the tracking direction, and the reflection mirror 9
It is displaced in the tracking direction as in the case of the objective lens 2.

As described above, when the objective lens 2 is displaced in the tracking direction, the reflection mirror 9 is also displaced in the tracking direction in cooperation with the objective lens 2, so that the optical axis deviation between the objective lens 2 and the reflection mirror 9 can be reduced. Can be.

Therefore, it is possible to reduce the occurrence of an offset with respect to the tracking error signal and to reduce the amount of return light as in the conventional case, thereby improving the utilization efficiency of the laser light and extending the life of the laser diode. it can. Further, the data write / read performance of the pickup on the optical disk can be stabilized.

Further, since the reflecting mirror 9 is linked to the tracking holding member 6 by the cylindrical elastic member 13 which is an elastic body, the reflecting mirror 9 can be stopped against vibration in a high frequency band. Therefore, the reflecting mirror 9 and the objective lens 2 are not integrally displaced in the tracking direction as in the optical control mechanism of the optical disk player described in Japanese Patent Laid-Open No. 58-98848. The load when driving in the direction can be reduced, the power consumption of the tracking drive system can be reduced, and the size can be reduced.

Therefore, by mounting the pickup block 1 of the first embodiment on an optical disk player, the reliability of the optical disk player can be improved.

In the first embodiment,
The elastic body that links the reflection mirror 9 to the tracking holding member 6 is a cylindrical elastic member 13.
As shown in FIG. 3, a linear member 15 such as a spring or a bar spring may be used.

Also, in FIG. 1 described above, the case where the displacement of the objective lens 2 in the tracking direction is performed by the hinge plate spring 7 of the rotation type has been described. The same effect can be obtained even when the wire type objective lens driving mechanism is adopted. (Second Embodiment) In the pickup block 1 according to the first embodiment, the reflection mirror 9 is attached to the tracking holding member 6 to which the hinge leaf spring 7 for displacing the objective lens 2 in the tracking direction is fixed. When the objective lens 2 is displaced in the tracking direction by the hinge leaf spring 7 in cooperation with the shaft 11 and the cylindrical elastic member 13, the reflection mirror 9 linked with the tracking holding member 6.
Similarly, the optical axis is displaced in the tracking direction so as to reduce the optical axis shift between the objective lens 2 and the reflection mirror 9. However, in this case, since the cylindrical elastic member 13 which is an elastic member is used in a portion where the tracking holding member 6 and the reflection mirror 9 are linked, the hardness of the elastic member changes due to the influence of the ambient temperature. Of the objective lens 2 in the tracking direction, the reflection mirror 9 may not be displaced in the tracking direction.

In the second embodiment, the objective lens and the reflecting mirror are not directly linked, but the objective lens and the reflecting mirror are linked in a non-contact manner, so that the amount of displacement of the objective lens in the tracking direction is controlled. Stabilizes the amount of displacement of the reflection mirror in the tracking direction according to.

FIG. 4 is a diagram showing a configuration of a pickup block according to a second embodiment to which the objective lens driving device of the present invention is applied. In the description of the present embodiment, the same components as those of the pickup block 1 of the first embodiment shown in FIG. 1 are denoted by the same reference numerals, and detailed description thereof will be omitted.

FIG. 4 is an exploded perspective view of the pickup block 20 according to the second embodiment. In FIG. 4, the pickup block 20 includes an objective lens 21 and a bobbin 22.
, And the bobbin 22 is connected to and supported by a support member 24 by four wire springs 23. An iron piece (magnetizing member) 25 is attached to the side surface of the bobbin 22 on the reflection mirror 9 side, and the iron piece 25 is attached to the bobbin 22 side surface of the parallel leaf spring holding member 15 to which the reflection mirror 9 is attached. A magnet (magnetic member) 26 is attached at a position opposite to.

The bobbin 22 supporting the objective lens 21 is
The four wire springs 23 and a support member 24 connected by the wire springs 23 are supported so as to be displaceable in the tracking direction and the focusing direction in FIG.

Therefore, the object lens 21 is displaced in the focusing direction and the tracking direction shown in FIG. 4 by the wire spring 23 flexing in the vertical and horizontal directions in FIG. 4, and the bobbin 22, the wire spring 23 and the support The member 24 functions as the objective lens support mechanism 20a.

As in the first embodiment, the reflecting mirror 9 is held by two parallel leaf springs 10 so as to be displaceable in the tracking direction shown in FIG. A magnet 26 is fixed to the side surface on the side. The fixed position of the magnet 26 is set at a position facing the iron piece 25 provided on the bobbin 22. The parallel leaf spring 10, the parallel leaf spring fixing member 14, and the parallel leaf spring holding member 15 are
Functions as b.

Therefore, when the objective lens 21 is displaced in the tracking direction in FIG. 4 by the wire spring 23, the iron piece 25 provided on the bobbin 22
Due to the attraction of the magnetic lines of force generated between the iron piece 25 and the magnet 26 fixed to the side surface of the reflection mirror 9 facing the iron piece 25,
The reflection mirror 9 is also pulled in the tracking direction. At this time, the parallel leaf spring 10 bends in the tracking direction,
The reflection mirror 9 is moved in the tracking direction like the objective lens 21.

Next, the operation of the present embodiment will be described. In the pickup block 20, in order to displace the objective lens 21 in the tracking direction, a bobbin 22 supporting the objective lens 21 is supported by a support member 24 connected by four wire springs 23, so that the tracking direction in FIG. The iron piece 25 is provided at a position facing the side surface of the reflection mirror 9 of the bobbin 22, and the magnet 26 is fixed to the side surface of the reflection mirror 9 facing the iron piece 25. Therefore, when the bobbin 22 is displaced in the tracking direction,
Since the objective lens 21 and the reflecting mirror 9 are configured to be displaced by the same amount in the tracking direction by the magnetic attraction of the iron piece 25 and the magnet 26, the displacement of the optical axis between the objective lens 21 and the reflecting mirror 9 is reduced. can do.

That is, when a focus driving mechanism (not shown) exerts a force in the focusing direction on the pickup block 20, the wire spring 23 holding the bobbin 22 bends upward or downward.
The objective lens 21 is displaced in the upward or downward focusing direction in FIG.

Further, when a force in the tracking direction is applied by a tracking drive mechanism (not shown), the bobbin 22 is pulled rightward or leftward in FIG.
Are displaced in the tracking direction of FIG.

When the objective lens 21 is displaced in the tracking direction, a magnetic force between the iron piece 25 provided on the bobbin 22 and the magnet 26 fixed to the reflection mirror 9 causes the parallel leaf spring holding member 15 and The parallel leaf spring 10 held by the parallel leaf spring fixing member 14 bends in the tracking direction, and the reflection mirror 9 is displaced in the tracking direction as in the case of the objective lens 2.

As described above, when the objective lens 21 is displaced in the tracking direction, the iron piece 25 provided on the bobbin 22 and the magnet 26 provided on the reflection mirror 9 are in non-contact, and the reflection mirror 9 is similarly tracked. Since the displacement is performed in conjunction with the direction, the optical axis deviation between the objective lens 21 and the reflection mirror 9 can be reduced. For this reason, it is possible to reduce the occurrence of the offset with respect to the tracking error signal and the decrease in the amount of the return light as in the above-described conventional technique, thereby improving the utilization efficiency of the laser light and extending the life of the laser diode. Further, the data write / read performance of the pickup on the optical disk can be stabilized.

In the pickup unit 20 according to the second embodiment, similarly to the pickup unit 1 according to the first embodiment, the reflecting mirror and the objective lens are not integrally displaced in the tracking direction.
The load at the time of driving in the tracking direction can be reduced, the power consumption of the tracking drive system can be suppressed low, and the size can be reduced.

Therefore, by mounting the pickup block 20 of the second embodiment on an optical disk player, the reliability of the optical disk player can be improved. (Third Embodiment) In the pickup block 20 of the second embodiment, the objective lens 21 and the reflection mirror 9 are provided.
Is displaced in conjunction with the tracking direction, an iron piece 25 is provided on the surface of the bobbin 22 supporting the objective lens 21 facing the reflection mirror 9, and the iron piece 25 of the parallel leaf spring holding member 15 supporting the reflection mirror 9 is provided. A magnet 26 is provided on the opposite side, and the iron piece 25 and the magnet 2
6 was used. However, in this case, since the iron piece 25 and the magnet 26 are simply arranged so as to face each other irrespective of their magnetic polarities, the attraction force generated by the magnetic force lines generated between the iron piece 25 and the magnet 26 takes the polarity into consideration. This is inferior to the case in which the bobbin 22 supporting the objective lens 21 moves, and a slight delay occurs in the timing in which the reflecting mirror 9 moves.

Therefore, in the third embodiment, a magnet is provided on the bobbin such that the magnetic pole dividing lines of the S and N poles are in the focusing direction, and is provided on the side surface of the reflection mirror facing this magnet. The magnetic poles S and N poles of the magnet are arranged so as to be attracted to the magnet provided on the bobbin to improve the followability of the reflecting mirror with respect to the movement of the objective lens in the tracking direction.

FIGS. 5 to 7 are views showing the structure of a pickup block to which the third embodiment of the objective lens driving device according to the present invention is applied. In the description of the present embodiment, the same components as those of the pickup block 20 of the second embodiment are denoted by the same reference numerals, and detailed description thereof will be omitted.

FIGS. 5 and 6 show a pickup block 30 according to a third embodiment. In FIGS. 5 and 6, the pickup block 30 holds the reflection mirror 9 so as to be displaceable in the tracking direction. A pair of fixing members 32 is attached to a base 31 for fixing the reflecting mirror support mechanism 30b.
And the fixing member 33 are fixed.

The fixing member 32 includes two parallel leaf springs 34.
The parallel plate spring holding member 35 to which the reflection mirror 9 is fixed is fixed to the other end of the two parallel plate springs 34. The magnet 36 is attached to the surface of the parallel leaf spring holding member 35 opposite to the surface on which the reflection mirror 9 is fixed. As shown in FIG. 7, the magnet 36 is provided at a position facing the magnet 37 provided on the bobbin 22, and its magnetic pole dividing line is installed in a direction coinciding with the focusing direction in FIG. The magnetic pole divided by the magnetic pole dividing line has N
The pole is the south pole on the left.

In FIG. 7, the magnet 37 provided on the bobbin 22 is also set so that the magnetic pole division line is in the focusing direction, and the magnetic pole divided by the magnetic pole division line is shown in FIG. As shown, the S pole is on the right and the N pole is on the left.

Accordingly, the magnetic poles of the magnet 36 and the magnet 37 facing each other are arranged in the direction in which the magnetic pole dividing line coincides with the focusing direction, and the respective magnetic poles are such that the N pole and the S pole face each other. The magnet 36 and the magnet 37 attract each other by magnetic force.

In FIG. 6, the objective lens 21 is
As shown in FIG. 4 of the second embodiment, it is supported by a bobbin 22 and connected to a support member 24 by a bobbin 22 and four wire springs 23. The support member 24 is fixed to the base 31 so that the bobbin 22 connected to the support member 24 by the wire spring 23 is disposed before the parallel leaf spring holding member 35 to which the reflection mirror 9 is fixed. Bobbin 2 above
2. The wire spring 23 and the support member 24 function as an objective lens support mechanism 30a as a whole.

When a force in the tracking direction is applied to the bobbin 22 by a tracking drive mechanism (not shown), the pickup block 30 pulls the bobbin 22 in the tracking direction. At this time, the four wire springs 23 bend, and the objective lens 2 is displaced in the tracking direction of FIG.

When a force in the focusing direction acts on the bobbin 22 by a focus driving mechanism (not shown), the pickup block 30 moves the bobbin 22 upward or downward, the wire spring 23 bends, and the objective lens 21 moves. It is displaced in the focusing direction of FIG.

Accordingly, the objective lens 21 is displaced in the focusing direction and the tracking direction shown in FIG. 6 when the wire spring 23 bends in the vertical and horizontal directions in FIG.

When the bobbin 22 is displaced in the tracking direction, the reflecting mirror 9 is attracted to each other by the magnetic force between the magnet 37 provided on the bobbin 22 and the magnet 36 provided on the side surface of the reflecting mirror 9. Bobbin 2
2 according to the displacement of the parallel leaf spring 1 in the tracking direction.
0 is deflected and similarly displaced in the tracking direction.

Accordingly, when the objective lens 21 is displaced in the tracking direction in FIG. 6 by the wire spring 23, the magnet 3 provided on the bobbin 22
The reflecting mirror 9 is also pulled in the tracking direction by the attraction force of the lines of magnetic force generated between the mirror 7 and the magnet 36 fixed to the side surface of the reflecting mirror 9 facing the same. At this time, the parallel leaf spring 34 bends in the tracking direction, and the reflection mirror 9 is moved in the tracking direction as in the case of the objective lens 21.

Next, the operation of the present embodiment will be described. When a focus driving force (not shown) acts on the bobbin 22 in the focusing direction, the pickup block 30 moves the bobbin 22 upward or downward in FIG. 21 is displaced in the focusing direction of FIG.

In the pickup block 30, a bobbin 22 is driven by a tracking drive mechanism (not shown).
When a force in the tracking direction acts on the bobbin 22, the bobbin 22 is pulled in the tracking direction. At this time, the four wire springs 23 bend, and the objective lens 2 is displaced in the tracking direction in FIG.

When the objective lens 21 is displaced in the tracking direction, the magnetic force between the magnet 37 provided on the bobbin 22 and the magnet 36 fixed on the reflection mirror 9 side holds the parallel leaf spring on the reflection mirror 9. The parallel leaf spring 34 held by the member 35 and the fixed member 32 also bends in the tracking direction, and the reflecting mirror 9
Is displaced in the tracking direction in the same manner as.

As described above, when the objective lens 21 is displaced in the tracking direction, a stronger attractive force generated between the magnet 37 provided on the bobbin 22 and the magnet 36 provided on the reflection mirror 9 side. Accordingly, the reflection mirror 9 is interlocked in a non-contact manner, and the reflection mirror 9 is similarly displaced in the tracking direction, so that the optical axis shift between the objective lens 21 and the reflection mirror 9 can be reduced.

Therefore, it is possible to reduce the occurrence of the offset with respect to the tracking error signal and the decrease in the amount of return light as described above, thereby improving the utilization efficiency of the laser light and extending the life of the laser diode. it can. Further, the data write / read performance of the pickup on the optical disk can be stabilized.

Further, in the pickup unit 30 according to the third embodiment, similarly to the pickup unit 1 according to the first embodiment, the reflecting mirror 9 and the objective lens 21 are not integrally displaced in the tracking direction. In other words, the load during driving in the tracking direction can be reduced,
The power consumption of the tracking drive system can be reduced, and the size can be reduced.

Therefore, by mounting the pickup block 30 of the third embodiment on an optical disk player, the reliability of the optical disk player can be improved. (Fourth Embodiment) In this embodiment, a hinge is used to displace the objective lens in the focusing direction and the tracking direction.

FIGS. 8 and 9 are views showing the structure of a pickup block according to a fourth embodiment to which the objective lens driving device of the present invention is applied. In the description of the present embodiment, the same components as those of the pickup block 30 of the third embodiment are denoted by the same reference numerals, and detailed description thereof will be omitted.

FIGS. 8 and 9 are views showing a pickup block 40 according to the fourth embodiment. 8 and 9, the pickup block 40 includes the objective lens 21.
Is supported by a bobbin 41, and the bobbin 41 is integrally formed with a rotating hinge portion 42 for rotating the bobbin 41 in the tracking direction. A tracking hinge member 43 for displacing the objective lens 21 supported by the bobbin 41 in the tracking direction is fixed to the base 44, and the rotating hinge portion 42 and the tracking hinge member 43 are connected by a parallel link member 45. . Further, a focus hinge portion 45a is formed at a connection portion between the parallel link member 45 and the rotation hinge member 42. Therefore, the bobbin 41, the rotating hinge part 42, the tracking hinge member 43, the parallel link member 45, and the focus hinge part 4
5a functions as the objective lens support mechanism 40a as a whole.

The reflection mirror 9 is supported by a reflection mirror holder 46, and reflection mirror tracking leaf springs 47 are provided at both left and right ends of the reflection mirror holder 46.
The reflecting mirror 9 is displaced in the tracking direction. The reflection mirror tracking leaf spring 47 is attached to a fixed member 48, and the fixed member 48 is fixed to the base 44. Therefore, the reflection mirror holder 4
6. Reflecting mirror tracking leaf spring 47 and fixing member 4
8 functions as a reflection mirror support mechanism 40b as a whole.

The reflection mirror holder 46 of the bobbin 41
A bobbin-side magnet 49 is provided on a side surface opposite to the above, and a reflection mirror-side magnet 50 is provided on a surface of the reflection mirror holder 46 facing the bobbin side magnet 49. Further, the base 44 has an inner yoke 5
1 and an outer yoke 52 are provided.
A magnet 53 is attached to a surface of the second yoke 51 facing the inner yoke 51. A focusing coil 54 and a tracking coil 55 are attached to the left and right side surfaces of the bobbin 41.

A part of the winding of the focusing coil 54 provided on the side surface of the bobbin 41 is arranged between the inner yoke 51 and the outer yoke 52 provided on the base 44. Due to the arrangement, the tracking coil 55 is arranged so as to face the magnet 53 attached to the outer yoke 52.

The tracking hinge member 43 includes a movable member 43a to which the parallel link member 45 is connected,
It comprises a fixed portion 43b fixed to the base 44, and a tracking hinge portion 43c formed at a connection portion between the movable member 43a and the fixed member 43b. In addition, a pin 56 provided on the base 44 is
Is formed.

Next, the operation of the present embodiment will be described. In the pickup block 40, a rotating hinge portion 42 is formed integrally with the bobbin 41 supporting the objective lens 21, and a tracking hinge member 43 for displacing the objective lens 21 in the tracking direction is formed between the rotating hinge portion 42 and the tracking hinge member 43. The focus hinge unit 4 is connected to the connecting portion between the parallel link member 45 and the pivot hinge member 42.
By forming 5a, the objective lens 21 supported by the bobbin 41 is supported so as to be displaceable in the tracking direction and the focusing direction in the drawing.

A bobbin magnet 49 is provided at a position facing the side surface of the reflecting mirror 9 of the bobbin 41, and a reflecting mirror magnet 50 is provided at a side surface of the reflecting mirror holder 46 facing the bobbin side magnet 49. When the bobbin 41 is displaced in the tracking direction, an attractive force is generated between the bobbin-side magnet 49 and the reflection mirror-side magnet 50 by a magnetic force line, and the reflection mirror 9 is displaced in the tracking direction similarly to the objective lens 21. You.

That is, in the pickup block 40, by passing a current through the focusing coil 54 and the tracking coil 55 attached to the left and right side surfaces of the bobbin 41, the outer yoke 52 provided on the base 44,
An electromagnetic force acts between a magnetic circuit formed by the inner yoke 51 and the magnet 53, and the rotating hinge portion 4 of the bobbin 41
The focus hinge portion 45a formed at the connection between the 2 and the parallel link member 45 is displaced in the focusing direction in FIG. 8 to displace the objective lens 21 supported by the bobbin 41 in the focusing direction or tracking. The hinge part 43 is displaced in the tracking direction and the bobbin 4
The objective lens 21 supported by 1 is displaced in the tracking direction.

When the objective lens 21 is displaced in the tracking direction, the objective lens 21 is mounted on the reflection mirror holder 46 by the magnetic force between the bobbin magnet 49 provided on the bobbin 41 and the magnet 50 mounted on the reflection mirror holder 46. The reflected mirror tracking leaf spring 47 also bends in the tracking direction, and the reflecting mirror 9 is displaced in the tracking direction in the same manner as the objective lens 21.

As described above, when the objective lens 21 is displaced in the tracking direction, it is generated between the bobbin-side magnet 49 provided on the bobbin 41 and the reflection mirror-side magnet 50 provided on the reflection mirror holder 46. The reflection mirror 9 is linked in a non-contact manner by a stronger suction force, and the reflection mirror 9 is similarly displaced in the tracking direction, so that the optical axis deviation between the objective lens 21 and the reflection mirror 9 can be reduced.

Therefore, it is possible to reduce the occurrence of the offset with respect to the tracking error signal and the decrease in the amount of return light as described above, thereby improving the utilization efficiency of the laser light and extending the life of the laser diode. it can. Further, the data write / read performance of the pickup on the optical disk can be stabilized.

Therefore, by mounting the pickup block 40 of the fourth embodiment on an optical disk player, the reliability of the optical disk player can be improved. (Fifth Embodiment) FIG. 10 is a diagram showing a configuration of a pickup block according to a fifth embodiment to which the objective lens driving device of the present invention is applied. In the description of the present embodiment, the same components as those of the pickup block 20 shown in FIG. 4 of the second embodiment are denoted by the same reference numerals, and detailed description thereof will be omitted.

FIG. 10 is a perspective view of a pickup block 60 according to the fifth embodiment. In FIG. 10, the pickup block 60 supports the objective lens 21 by an elliptical support member 61, and a shaft 62 is inserted through a substantially central portion of the support member 61. This support member 6
1 is provided with a focus coil 6 inserted through a shaft 62.
3 is fixed, and a tracking coil 64 is attached to the peripheral surface of the focus coil 63. The support member 61 and the shaft 62 function as an objective lens support mechanism 60a as a whole.

The support member 61 and the focus coil 63
The inserted shaft 62 is supported so as to be rotatable about the shaft 62 in the tracking direction in FIG. 10 and slidably supported in the focusing direction in FIG. Further, a magnet 65 is attached to a position facing the side surface of the reflection mirror 9 below the support member 61. A magnet 66 is attached to a side surface of the parallel leaf spring holding member 15 that supports the reflection mirror 9 facing the magnet 65.

A magnetic circuit (not shown) is provided near the peripheral surfaces of the focus coil 63 and the tracking coil 64. When a current flows through the focus coil 63 and the tracking coil 64, a magnetic circuit (not shown) is provided. The support member 61 fixed to the focus coil 63 is turned around the shaft 62, and the objective lens 21 is turned in the tracking direction in the drawing or slides in the direction of the shaft 62. Then, the objective lens 21 is moved in the focusing direction in FIG.

The parallel leaf spring 10, the parallel leaf spring fixing member 14, and the parallel leaf spring holding member 15 function as a reflection mirror support mechanism 1b as a whole.

Next, the operation of the present embodiment will be described. In the pickup block 60, a focus coil 63 and a tracking coil 64 are fixed to a support member 61 that supports the objective lens 21, and a shaft 62 is inserted through the support member 62 and the focus coil 63 so as to be freely rotatable in the tracking direction and to form. It is movably supported in the caching direction.

Further, the reflection mirror 9 on the lower side of the support member 61
A magnet 65 is provided at a position facing the side surface of the mirror 65, and a magnet 66 is provided on the side surface of the reflection mirror 9 facing the magnet 65, so that when the support member 61 is displaced in the tracking direction, the magnet 65 and the magnet 66 The reflecting mirror 9 is also displaced in the tracking direction in the same manner as the objective lens 21 by the attractive force of the magnetic force line between the two.

That is, in the pickup block 60, when a current flows through the focus coil 63 fixed below the support member 61 and the tracking coil 64 attached to the peripheral surface of the focus coil 63, the focus coil 63 An electromagnetic force acts between the tracking coil 64 and a magnetic circuit (not shown) provided near the peripheral surface of the tracking coil 64, and the support member 61 fixed to the focus coil 63 is rotated about the shaft 62, The objective lens 21 is rotated in the tracking direction in FIG. 10 or is slid in the direction of the axis 62 to move the objective lens 21 in the focusing direction in FIG.

When the objective lens 21 is displaced in the tracking direction as described above, the magnetic force between the magnet 65 provided below the support member 61 and the magnet 66 attached to the side surface of the reflection mirror 9 causes The parallel leaf spring 10 attached to the reflection mirror 9 also bends in the tracking direction, and the reflection mirror 9 is displaced in the tracking direction in the same manner as the objective lens 21.

Therefore, when the objective lens 21 is displaced in the tracking direction, the magnetic force generated between the magnet 65 provided on the support member 61 and the magnet 66 provided on the reflection mirror 9 causes a non-magnetic force. Since the reflection mirror 9 is linked with the contact and the reflection mirror 9 is similarly displaced in the tracking direction, the optical axis deviation between the objective lens 21 and the reflection mirror 9 can be reduced.

As a result, it is possible to reduce the occurrence of the offset with respect to the tracking error signal and the decrease in the amount of return light as in the conventional case, thereby improving the use efficiency of the laser light and extending the life of the laser diode. Can be. Further, the data write / read performance of the pickup on the optical disk can be stabilized.

In the pickup block 60 of the fifth embodiment, the support member 61 supporting the objective lens 21 is slid by the shaft 62 to displace the objective lens 21 in the focusing direction. The configuration is not limited to this. For example, as shown in FIG. 11, a configuration may be adopted in which the reflection mirror 9 is slid in the tracking direction by an axis.

That is, in FIG.
A fixing member 73 provided with two holes 71a in a block 71 for supporting the shaft 71 and a shaft 72 inserted through the holes 71a.
Is fixed to a base 74, the block 71 is slidably supported by a shaft 72, and a magnet 75 is provided on a side surface of the block 71. When the objective lens 21 is displaced in the tracking direction by the objective lens driving mechanism shown in FIG. 10, the magnetic action generated between the magnet 65 provided on the support member 61 and the magnet 75 provided on the reflection mirror 9. As a result, the block 71 slides on the shaft 72 in the tracking direction, and the reflection mirror 9 is moved in the tracking direction in the same manner as the objective lens 21. (Sixth Embodiment) In each of the second to fifth embodiments, the iron piece or the magnet provided on the bobbin or the supporting member for supporting the objective lens and the side surface of the reflecting mirror, the reflecting mirror holder or the block are provided. Since there is no mechanism for adjusting the distance between the magnet and the provided magnet, the reflection mirror cannot be adjusted in the jitter direction, and the followability of the reflection mirror to the objective lens cannot be properly adjusted.

In the sixth embodiment, the support member of the reflection mirror can be moved and adjusted in the jitter direction, so that the followability of the reflection mirror can be appropriately adjusted, and stable driving on the servo can be performed.

FIG. 12 is a diagram showing a configuration of a pickup block according to a sixth embodiment to which the objective lens driving device according to the present invention is applied. In the description of the present embodiment, the pickup block 20 of the second embodiment is described.
The same components as those described above are denoted by the same reference numerals, and detailed description thereof is omitted.

FIG. 12 is a front partial sectional view of a pickup block 80 according to the sixth embodiment. In FIG. 12, the pickup block 80 has screw holes 81a and 81b in the vertical and horizontal portions of an L-shaped fixing member 81 attached to the end of the parallel leaf spring 10 supporting the reflection mirror 9. A U-shaped base 82 to which the fixing member 81 is fixed has screw holes 82a in its vertical and horizontal portions so that screws can be passed through the screw holes 81a and 81b formed in the fixing member 81. , 82b are open.

The adjusting member 83 is screwed into the screw hole 81a formed in the vertical portion of the base 82 in accordance with the amount of the adjustment screw 83 screwed into the screw hole 82a formed in the vertical portion of the base 82. Attached parallel leaf spring 10
When the reflection mirror 9 is moved in the jitter direction indicated by a double arrow in FIG. 12, the magnet 26 provided on the side surface of the reflection mirror 9 is moved in the jitter direction in FIG.

By adjusting the jitter direction of the reflecting mirror 9 by the adjusting screw 83, the distance (indicated by Δl in FIG. 12) between the magnet 34 on the reflecting mirror 9 side and the magnet 25 on the opposing bobbin 22 side. Adjusted. After adjusting Δl between the magnets 25 and 26, the fixing member 8
1 and the screw hole 81b formed in the horizontal portion.
2 through the screw hole 82b formed in the horizontal portion.
Is screwed, the fixing member 81 is fixed to the base 82, and Δl between the magnets 25 and 26 is fixed. In FIG. 12, reference numeral 85 denotes a leaf spring.

The bobbin 22, the wire spring 23 and the base 82 function as an objective lens supporting mechanism 80a, and the parallel leaf spring 10 and the fixing member 81 function as a reflecting mirror supporting mechanism 80b. Then, the fixing member 81, the base 82, the adjusting screw 83, and the fixing screw 84
Functions as a jitter direction adjusting mechanism that can adjust the position of the reflecting mirror 9 as a whole in a jitter direction orthogonal to both the optical axis of the objective lens 21 and the tracking direction.

As described above, in the pickup block 80 of the sixth embodiment, the reflection mirror support mechanism 80b
Can be adjusted in the jitter direction with respect to the screw holes 8a and 81b formed in the fixing member 81 from the base 82 side by the adjusting screw 83, and the fixing screw 84 can be adjusted from the base 82 side.
Therefore, the distance between the magnet 25 provided on the side surface of the reflection mirror 9 and the magnet 26 on the side of the bobbin 22, that is, Δl in FIG. 12 can be finely adjusted appropriately.

Conventionally, when Δl varies due to component dimensions, the magnetic attraction force between the magnets varies, and the follow-up characteristics of the reflecting mirror 9 vary, and in particular, Δl is small due to the magnet characteristics. In this case, the minute variation in Δl greatly affected the variation in the attraction force between the magnets.

However, in the pickup block 80 of the sixth embodiment, since a mechanism for adjusting Δl between the magnet 25 and the magnet 26 is provided,
Δl can be adjusted so as to stabilize the attraction force between the mirrors 5 and 26, the followability of the reflecting mirror 9 with respect to the objective lens 21 can be set appropriately, and the servo can be driven stably.

The adjustment mechanism for Δl provided in the pickup block 80 of the sixth embodiment shown in FIG. 12 is not limited to the above. For example, an adjustment mechanism as shown in FIG. 13 may be used. The adjusting mechanism shown in FIG. 13 is provided with a screw hole 91a and an elongated slot 91b for adjustment in a horizontal portion of the fixing member 91 of the reflection mirror, and a concave portion 94a in the base 94 at a position where the fixing member 91 is fixed, This recess 94
a, a screw hole 91a and a long hole 9 formed in the fixing member 91;
A screw hole 94b and a hole 94c corresponding to 1b are formed.

A screw 92 is screwed into a screw hole 91a formed in the fixing member 91, and a pin portion 93a of an eccentric pin 93 is passed through a long hole 91b to a hole 94c of a base 94 to rotate the eccentric portion 93a of the eccentric pin 93. Can be done. Therefore, when adjusting Δl, after the pin portion 93b of the eccentric pin 93 is fixed through the long hole 91b and the hole 94c of the base 94, and then the eccentric portion 93a of the eccentric pin 93 is rotated, the fixing member 91 is moved in the jitter direction. Can be moved to After adjusting Δl, the fixing screw 92 is screwed into the screw hole 91a of the fixing member 91 and the screw hole 94b of the base 94.
, The fixing member 91 is fixed. (Seventh Embodiment) FIGS. 14 and 15 are views showing a seventh embodiment of the objective lens driving device according to the present invention.
In the description of the present embodiment, the same components as those of the second embodiment shown in FIG.
A detailed description thereof will be omitted.

FIG. 14 is an exploded perspective view of a pickup block 100 to which the objective lens driving device of the present invention is applied. In the pickup block 100, the objective lens 21 is supported by the bobbin 22, and the bobbin 22 has four bobbins 22. It is connected to a support member 24 by a wire spring 23. A tubular elastic member (tubular elastic body) 101 is attached to the side surface of the bobbin 22 on the reflection mirror 9 side. The tubular elastic member 101 is made of, for example, a rubber tube, and is used for focusing. As shown in FIG. 15, it is attached to the bobbin 22 so that the center axis of the cylinder coincides with the tracking direction so that the spring constant in the direction is low and the spring constant in the tracking direction is high. The tube-like elastic member 101 has an adhesive surface 101a to which an adhesive is applied on the surface on the reflection mirror 9 side. As shown in FIG. Member 1
01 is adhered to the reflection mirror 9.

As shown in FIG. 16, the support member 24 is fixed by screwing a screw 102 passing through the hole 24 a into a screw hole 104 a of a fixing member 104 fixed to the base 103.

The reflection mirror 9 includes a parallel leaf spring holding member 10.
5, one end of a pair of parallel leaf springs 106 is fixed to the parallel leaf spring holding member 105. The other end of the pair of parallel leaf springs 106
The reflecting mirror 9 is fixed to a fixed member 107 formed of a pair of parallel leaf springs 1.
06 and a parallel leaf spring holding member 105 so as to be displaceable in the tracking direction. Therefore, the bobbin 22, the wire spring 23 and the support member 24
Functions as an objective lens support mechanism 100a, and the parallel leaf spring holding member 105, the parallel leaf spring 106, and the fixing member 107 function as a reflection mirror support mechanism 100b.

Next, the operation of the present embodiment will be described. In the pickup block 100, when a focusing force is applied in a focusing direction by a focus driving mechanism (not shown), a wire spring 23 holding the bobbin 22 bends upward or downward, and the objective lens 21 held by the bobbin 22 moves upward. Alternatively, it is displaced in the downward focusing direction.

Further, when a force in the tracking direction acts on the bobbin 22 by a tracking drive mechanism (not shown), the bobbin 22 is pulled rightward or leftward.
When the wire spring 23 bends, the objective lens 21 is displaced in the tracking direction in FIG.

When the objective lens 21 is displaced in the tracking direction as described above, the tubular elastic member 101 provided on the bobbin 22 is fixed to the reflection mirror 9, and the reflection mirror 9 is held by the parallel leaf spring 106. So
Due to the elasticity of the tubular elastic member 101 and the elasticity of the parallel leaf spring 106, the reflecting mirror 9 is displaced following the tracking direction.

When the objective lens 21 is displaced in the focusing direction, a reflecting mirror is similarly fixed to the tubular elastic member 101 attached to the bobbin 22, and the reflecting mirror 9 is connected to the parallel leaf spring 106. However, since the spring constant of the tube-shaped elastic member 101 is set high in the tracking direction and low in the focusing direction, the elasticity of the tube-shaped elastic member 101 causes the objective lens 21 and the reflection mirror 9 to track. Displaces following the direction.

Since the spring constant of the tubular elastic member 101 is set high in the tracking direction and low in the focusing direction as described above, the followability of the reflecting mirror 9 in the tracking direction can be improved. In addition, the driving current of the focusing drive mechanism in the focusing direction can be reduced.

In this embodiment, a bobbin 22 for holding the objective lens 21 and a parallel leaf spring holding member 105 and a parallel leaf spring 106 for holding the objective lens 9 are attached to the base 103 on opposite sides opposite to each other. However, as shown in FIGS. 17 and 18, they may be collectively attached to one side of the base 103.

That is, as shown in FIGS. 17 and 18, the pickup block 110 is provided with a pair of parallel leaf springs 1 on a fixing member 111 fixed to one side of the base 103.
The reflection mirror 9 is attached to the other end of the parallel leaf spring 106 via a parallel leaf spring holding member 105. A magnet 113 of a tracking / focusing drive mechanism 112 is attached to the fixing member 111, and a magnet 114 of the tracking / focusing drive mechanism 112 and a coil 115 are provided on the base 103 at a position facing the magnet 112.
Are arranged.

The bobbin 22 holding the objective lens 21 is
The supporting member 24 is connected and held by a wire spring 23, and is fixed to the fixing member 111 by a screw (not shown) penetrating the hole 24a.

A tubular elastic member 101 is attached to the surface of the bobbin 22 on the reflection mirror 9 side. The tubular elastic member 101 is bonded to a parallel leaf spring holding member 105 to which the reflection mirror 9 is attached. I have.

Therefore, pickup block 110
According to the embodiment, the same operation and effect as those of the pickup block 100 can be obtained, and even when the inclination of the tracking / focusing drive mechanism 112 is adjusted, the reflection mirror 9 does not tilt, and the laser light incident on the objective lens 21 can be obtained. Can be prevented from tilting.

As described above, each invention made by the present inventor has been specifically described based on preferred embodiments. However, the present invention is not limited to the above-described ones and does not depart from the gist of the invention. It goes without saying that various changes can be made.

[0129]

According to the objective lens driving device of the present invention, an objective lens supporting mechanism for movably supporting an objective lens for condensing and irradiating light on an optical disc surface in a tracking direction and a focusing direction, A reflecting mirror supporting mechanism that reflects the light incident from the tracking direction in the focusing direction and supports the reflecting mirror incident on the objective lens so as to be movable in the tracking direction by a linking means, and When the supported objective lens moves in the tracking direction, the reflecting mirror supported by the reflecting mirror support mechanism is moved in conjunction with the tracking direction, so that the movement of the reflecting mirror in the tracking direction relative to the movement of the objective lens in the tracking direction is performed. The ability to follow the movement can be improved, and the amount of deviation of the optical axis can be reduced. Kill.

According to the objective lens driving device of the second aspect of the present invention, since the objective lens support mechanism and the reflection mirror support mechanism are linked by a predetermined elastic body, the objective lens drive mechanism has a simple structure and is inexpensive. The followability of the movement of the reflection mirror in the tracking direction with respect to the movement of the lens in the tracking direction can be improved, and the optical axis shift amount can be reduced at low cost.

According to the objective lens driving device of the third aspect of the present invention, the objective lens supporting mechanism and the reflecting mirror supporting mechanism are linked by the tubular elastic body, and the center line of the tubular elastic body in the cylinder direction is set. Since it is made coincident with the tracking direction, the elastic constant in the tracking direction can be increased, the elastic constant in the focusing direction can be reduced, the followability of the reflecting mirror to the objective lens can be improved, and the driving current in the focusing direction can be improved. Can be reduced.

According to the objective lens driving device of the present invention, the objective lens supporting mechanism and the reflecting mirror supporting mechanism are separated from each other by a predetermined distance between the magnetic member such as an iron piece attached to one of them and the magnetic member. Since the object lens support mechanism and the magnetic member attached to the other of the reflection mirror support mechanism are opposed to each other, the objective lens and the reflection mirror can be moved in the tracking direction without contact, and the temperature change and the like can be performed. The followability of the reflecting mirror to the objective lens can be improved stably with respect to environmental changes. As a result, the amount of deviation of the optical axis can be further reduced.

According to the objective lens driving device of the fifth aspect of the present invention, the objective lens supporting mechanism and the reflecting mirror supporting mechanism are mounted on one of them, and the magnetic pole parting lines are arranged so as to coincide with the focusing direction. The first magnet and the other of the objective lens support mechanism and the reflection mirror support mechanism are attached to the first magnet so as to be opposed to each other with a predetermined space therebetween, and the magnetic pole parting lines are arranged to coincide with the focusing direction. The second magnet has a polarity opposite to that of the first magnet opposite to the first magnet, so that in the tracking direction, the followability of the reflection mirror to the objective lens is further improved by a strong attractive force. And the driving current in the focusing direction can be reduced.

According to the objective lens driving device of the invention, a jitter direction adjusting mechanism capable of adjusting the position of the reflection mirror in a jitter direction orthogonal to both the optical axis of the objective lens and the tracking direction is further provided. The distance between the magnetized member and the magnetic member or the distance between the opposed magnets can be adjusted, stabilizing these attractive forces, and further improving the followability of the reflecting mirror to the objective lens. Can be done.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view of a pickup block mounted on an objective lens driving device to which a first embodiment of the objective lens driving device according to the present invention is applied.

FIG. 2 is a plan partial cross-sectional view of a linking portion that links a reflection mirror and a tracking holding member in FIG. 1;

FIG. 3 is a plan view showing another example of a linking part that links the reflection mirror and the tracking holding member of FIG. 1;

FIG. 4 is an exploded perspective view of a pickup block mounted on the objective lens driving device to which the second embodiment of the objective lens driving device according to the present invention is applied.

FIG. 5 is a perspective view of a reflection lens portion of a pickup block mounted on an objective lens driving device to which a third embodiment of the objective lens driving device according to the present invention is applied.

FIG. 6 is a perspective view showing a state where an objective lens portion is attached to the pickup block of FIG. 5;

FIG. 7 is a perspective view showing the arrangement of magnetic poles of magnets provided respectively on the bobbin and the reflection mirror in FIG. 5;

FIG. 8 is a partially cutaway perspective view of a pickup block mounted on an objective lens driving device to which a fourth embodiment of the objective lens driving device according to the present invention is applied.

FIG. 9 is an exploded perspective view of the pickup block of FIG. 8;

FIG. 10 is a perspective view of a pickup block mounted on an objective lens driving device to which a fifth embodiment of the objective lens driving device according to the present invention is applied.

11 is an exploded perspective view illustrating an example of a sliding mechanism of a reflection mirror with respect to the objective lens in FIG.

FIG. 12 is a front partial sectional view of a pickup block mounted on an objective lens driving device to which a sixth embodiment of the objective lens driving device according to the present invention is applied.

FIG. 13 is an exploded perspective view of another example of a fixing member adjusting mechanism of the reflecting mirror fixing member adjusting mechanism of FIG. 12;

FIG. 14 is an exploded perspective view of a pickup block mounted on an objective lens driving device to which a seventh embodiment of the objective lens driving device according to the present invention is applied.

FIG. 15 is an enlarged perspective view of the tubular elastic member of FIG. 14;

FIG. 16 is a partial front sectional view of the pickup block shown in FIG. 14;

FIG. 17 is a perspective view showing another example of the pickup block of FIG. 14;

FIG. 18 is an exploded perspective view of the pickup block of FIG. 17;

FIG. 19 is a diagram showing a relationship between a conventional objective lens, a reflection mirror, and an optical axis.

[Explanation of symbols]

1, 20, 30, 40, 50, 60, 80, 100 Pickup block 1a, 20a, 30a, 40a, 50a, 60a Objective lens support mechanism 80a, 100a Objective lens support mechanism 1b, 20b, 30b, 40b, 50b, 60b Reflection mirror support mechanism 80b, 100b Reflection mirror support mechanism 2, 21 Objective lens 3 Focus leaf spring 3a Hole 4 Spacer 5 Fixing pin 6 Tracking holding member 7 Hinge leaf spring 8 Hinge leaf spring holding member 9 Reflecting mirror 10, 34 Parallel leaf spring DESCRIPTION OF SYMBOLS 11 Shaft 12, 81 Fixing member 13 Cylindrical elastic member 14 Parallel leaf spring fixing member 14a Screw 15, 35 Parallel leaf spring holding member 22, 41 Bobbin 23 Wire spring 24, 61 Support member 25 Iron piece 26, 36, 37 Magnet 31 Base 32, 33, 4 Fixed member 42 Rotating hinge part 43 Tracking hinge member 44 Base 45 Parallel link member 45a Focus hinge part 46 Reflective mirror holder 47 Reflective mirror tracking leaf spring 49 Bobbin side magnet 50 Reflective mirror side magnet 51 Inner yoke 52 Outer yokes 53, 65, 66, 75 Magnet 54 Focusing coil 55 Tracking coil 56 Pin 62 Axis 63 Focus coil 64 Tracking coil 71 Block 71a Hole 72 Axis 73 Fixing member 74 Base 75 Magnet 81a, 81b, 82a, 82b Screw hole 83 Adjusting screw 84 Fixing screw 91 Fixing member 91a Screw hole 91b Long hole 92 Screw 93 Eccentric pin 94 Base 94a Depression 94b Screw hole 94c Hole 101 Tubular elastic member 101a Adhesion Surface 102 Screw 103 Base 104 Fixing member 104a Screw hole 105 Parallel leaf spring holding member 106 Parallel leaf spring 107 Fixing member

Claims (6)

[Claims] An objective lens supporting mechanism for movably supporting an objective lens for condensing and irradiating light on an optical disk surface in a tracking direction and a focusing direction, and reflecting light incident from the tracking direction in the focusing direction. A reflecting mirror support mechanism for supporting a reflecting mirror incident on the objective lens so as to be movable in the tracking direction, wherein the objective lens supporting mechanism and the reflecting mirror supporting mechanism are: When the objective lens supported by the objective lens supporting mechanism is moved in the tracking direction by a predetermined linking means, the reflecting mirror supported by the reflecting mirror supporting mechanism by the linking means is linked in the tracking direction. An objective lens driving device characterized in that the objective lens driving device is moved. 2. The objective lens driving device according to claim 1, wherein said linking means is an elastic body having a predetermined elasticity attached over said objective lens support mechanism and said reflection mirror support mechanism. 3. The elastic body is a tubular elastic body,
2. The objective lens driving device according to claim 1, wherein a center line of the tubular elastic body in a cylinder direction is disposed in a direction coinciding with the tracking direction. 4. The linking means includes: a magnetized member such as an iron piece attached to one of the objective lens support mechanism and the reflection mirror support mechanism; 2. The objective lens driving device according to claim 1, further comprising a mechanism and a magnetic member attached to the other of the reflection mirror support mechanism. 5. A first magnet attached to one of the objective lens support mechanism and the reflection mirror support mechanism, the magnetic pole parting line being arranged to coincide with the focusing direction. The other of the objective lens support mechanism and the reflection mirror support mechanism is attached to the first magnet so as to face each other with a predetermined space therebetween, and the magnetic pole parting line is disposed so as to coincide with the focusing direction, and its polarity is determined. 2. The objective lens driving device according to claim 1, further comprising: a second magnet having a polarity opposite to a polarity of the first magnet opposed to the first magnet. 3. 6. The objective lens driving device further includes a jitter direction adjusting mechanism capable of adjusting a position of the reflection mirror in a jitter direction orthogonal to both an optical axis of the objective lens and the tracking direction. The objective lens driving device according to claim 4 or 5, wherein