JP2001006198A - Optical pickup device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To finely control a seek and/or finely control a tilt without increasing in size an optical pickup device and to record/reproduce an optical disk. SOLUTION: This optical pickup device finely moves an optical pickup 1 supported at one side by vibrationproofing rubbers 5a, 5b to a carriage 3 by an electromagnetic action of a magnet 8 by supplying a current to a coil 7 of a seeking direction finely driving means 6 provided at the other side of the pickup 1 when the pickup 1 must be finely driven in the seeking direction A.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical disk drive, which has an objective lens for irradiating an optical disk with a beam spot, and an optical pickup for recording / reproducing information on / from the optical disk. The present invention relates to an optical pickup device.

[0002]

2. Description of the Related Art At the time of recording / reproducing with respect to an optical disk on which high density recording such as a DVD is performed, there is a relative inclination between an objective lens for irradiating a beam spot to the optical disk in an optical pickup and the objective lens. Then, aberration occurs in the beam spot converged on the recording surface of the optical disk, and good recording / reproduction is not performed.

For this reason, conventionally, in order to remove the relative tilt between the optical disk and the objective lens, an optical pickup, a carriage for supporting the optical pickup and moving in the seek direction, and a sheet for guiding the carriage in the seek direction. Tilt control with respect to Claire
-91731).

[0004] Further, with the recent trend of miniaturization and cost reduction in optical disk drive devices, an optical pickup seek mechanism having a structure using a lead screw for a drive system in a seek mechanism is increasing.

[0005]

In the above prior art, when control is applied to the optical pickup together with the seek rail when performing tilt control, the optical pickup is moved and driven in the thickness direction of the optical disk drive, so that the optical disk is driven. In order to avoid interference with the loading mechanism, the thickness of the optical disk drive in the height direction must be increased, which has been an obstacle in reducing the size and thickness of the device.

Further, in the case of using a lead screw as a drive system in a seek mechanism of an optical pickup, cogging occurs because a small DC motor for driving the lead screw has a core. Due to this cogging, the optical pickup has a general structure, for example, about 2
It will move every 00 μm. To make the seek movement even smoother, it can be solved by increasing the gear ratio of the lead screw drive system. However, in this case, the optical pickup cannot be sought at high speed.

If the seek can be sent only every 200 μm, the optical axis of the objective lens and the optical axis of the pickup optical system are shifted by 200 μm. This shift causes a track offset with respect to the track groove of the optical disk in the objective lens, deviates from tracking control, lowers the S / N ratio of the detection signal,
Alternatively, the recording power may be reduced, which causes a serious obstacle to recording / reproducing, which is the basic performance of the optical pickup.

The present invention solves the above-mentioned conventional problems, enables seek fine-motion control and / or tilt fine-motion control without increasing the size of the apparatus, and enables good recording / reproduction on an optical disk. It is an object to provide an optical pickup device.

[0009]

In order to achieve the above object, the present invention relates to an optical pickup having an objective lens for irradiating a beam spot on an optical disk, and recording / reproducing information on / from the optical disk. An optical pickup device including a carriage that supports the optical pickup and moves the optical pickup in a seek direction, wherein the optical pickup is displaceably supported by the elastic support member with respect to the carriage, and the optical pickup is moved in the seek direction. A seek direction fine movement drive means for fine movement is provided. With this configuration, the entire optical pickup can be finely moved in the seek direction, for example, during a dead zone due to cogging of the carriage. Prevents misalignment and enables good recording / reproduction To become.

Further, the present invention has an objective lens for irradiating an optical disk with a beam spot, and an optical pickup for recording / reproducing information on / from the optical disk; and supporting the optical pickup and moving it in a seek direction. An optical pickup device including a carriage, wherein the optical pickup is displaceably supported by the elastic support member with respect to the carriage, and seek direction fine movement driving means for finely moving the optical pickup in the seek direction;
A tilt direction fine movement drive unit for finely moving the optical pickup with respect to the tilt direction. With this configuration, the entire optical pickup can be finely moved in the seek direction and the tilt direction. Optical axis deviation, and the aberration of the beam spot on the optical disk can be removed,
Good recording / reproduction becomes possible.

Further, according to the present invention, a plurality of elastic supporting members support a portion near the objective lens and a portion distant from the objective lens in the optical pickup, and the elastic supporting member near the objective lens has an elasticity at a portion distant from the objective lens. Since the objective lens does not move in the focusing direction even when the fine movement driving means is operated, the amount of change due to the tilt control at the height position of the objective lens is eliminated. Therefore, the movable range in the focus direction of the device for driving the objective lens can be reduced, so that the device can be made thinner. In addition, since the objective lens side, which tends to be heavy in the optical pickup, can be reliably supported by a relatively hard elastic support member, the weight can be balanced without using a balancer and the like, and the overall weight can be reduced. Becomes possible.

Further, in the present invention, the elastic support member is a rubber-based member. With this configuration, the operation characteristics of the device can be stabilized by using a vibration-proof rubber such as butyl rubber or silicon rubber. it can.

Further, in the present invention, the elastic support member is a wire. With this configuration, the variation in the elastic modulus of the support portion is reduced as compared with the rubber type.
The operating characteristics of the device can be stabilized.

Further, in the present invention, the plurality of seek direction fine movement driving means and the plurality of tilt direction fine movement driving means are disposed substantially symmetrically about the center of gravity of the optical pickup, respectively. During the fine movement drive in the seek direction and the fine movement drive in the tilt direction, no unnecessary moment is generated, so that the operation characteristics of the apparatus can be stabilized.

Further, the present invention has an objective lens for irradiating the optical disk with a beam spot, and an optical pickup for recording / reproducing information on / from the optical disk, and supports the optical pickup and moves the optical pickup in a seek direction. In an optical pickup device including a carriage, both sides of the optical pickup are displaceably supported by at least two plate springs parallel to each other with respect to a substrate, and the substrate is rotatably supported by the carriage. A yoke and a magnet are provided on the carriage, and a coil for seek direction fine movement and a coil for tilt direction fine movement are provided on a magnetic path portion between the yoke and magnet in the optical pickup. A single magnet enables fine-motion drive in the seek direction and fine-motion drive in the tilt direction. It can be independently a direction fine motion and the tilt direction fine motion.

Further, in the present invention, the center of rotation of the substrate is set near the objective lens. With this configuration, even if the tilt control of the objective lens is performed, the objective lens is controlled at the center of the principal point. Therefore, there is no displacement of the objective lens in the focus and tracking directions due to the tilt control.

Further, the present invention has an objective lens for irradiating the optical disk with a beam spot and records / reproduces information on / from the optical disk, and supports the optical pickup and moves it in the seek direction. An optical pickup device including a carriage, wherein the optical pickup is displaceably supported by the at least two piezo elements with respect to the carriage, and each piezo element is provided so as to be able to expand and contract in the seek direction, and This configuration enables fine drive in the seek direction and fine drive in the tilt direction by supplying power to the piezo element, and a small-sized drive structure with excellent followability can be provided.

[0018]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a partially cutaway perspective view of an optical pickup device for explaining a first embodiment of the present invention. Reference numeral 1 denotes an optical disk (not shown, hereinafter referred to as a medium). An optical pickup 3 having a built-in objective lens 2 for irradiating a beam spot and an optical system for recording / reproducing information on / from an optical disk, and a seek direction while receiving movement guide of a pair of seek rails 4. The carriages 5a and 5b are a plurality of (two shown in FIG. 1) elastic support members for displaceably supporting the optical pickup 1 inside the carriage 3 (for example, butyl rubber, silicon rubber). It is.

Reference numeral 6 denotes a coil 7 provided on a side wall of the optical pickup 1 in the vicinity of the objective lens 2 installation portion.
And a magnet 8 provided on the inner wall of the carriage 3 opposed to the coil 7 and having a different polarity in the seek direction (the direction of arrow A). The seek direction fine movement driving means 9 for slightly moving the optical pickup 1 in the seek direction is provided. A coil 10 provided on a side wall of the optical pickup 1 distant from the installation portion of the objective lens 2 and a magnet 11 provided on an inner wall of the carriage 3 opposed to the coil 10 and having different polarities in a direction substantially orthogonal to a seek direction. And tilt the optical pickup 1 in the tilt direction (the direction of the arrow B).
This is a tilt direction fine movement driving means for fine movement.

In the first embodiment, the seek direction fine movement drive means 6 and the tilt direction fine movement drive means 9 are provided. However, depending on the specification, only the seek direction fine movement drive means 6 may be provided. In this case, the opposing direction of the coil 7 and the magnet 8 is desirably provided on an axis passing through the center of gravity of the optical pickup 1 at right angles to the seek direction. Can be reduced.

Next, the operation of the first embodiment shown in FIG. 1 will be described.

When it is necessary to finely move the optical pickup 1 in the seek direction A, an electric current flows through the coil 7 of the seek direction fine movement driving means 6 so that the optical pickup 1 is moved relative to the carriage 3 by an electromagnetic action with the magnet 8. It can be moved slightly in the seek direction.

More specifically, the current flowing through the coil 7 is controlled such that the track offset amount output from the pickup detection system mounted on the optical pickup 1 is monitored and the track offset is always zero. . The optical pickup 1 supported by the vibration-proof rubbers 5a and 5b on the carriage 3 by receiving the acting force in the direction of arrow A generated by the seek direction fine movement driving means 6 in this manner It will slightly move in the seek direction.

Therefore, in the first embodiment, the dead zone 2 due to cogging in the carriage 3 as in the prior art is used.
By slightly moving the entire optical pickup 1 in the seek direction during 00 μm, it is possible to prevent the optical axis of the objective lens 2 and the like from being displaced, and it is possible to perform good recording / reproduction by the optical pickup device.

When it is necessary to finely move the optical pickup 1 in the tilt direction B, the tilt direction fine movement driving means 9
The optical pickup 1 can be finely moved in the tilt direction with respect to the carriage 3 by an electromagnetic action with the magnet 11 by passing a current through the coil 10.

More specifically, the current flowing through the coil 10 is controlled so as to correct the tilt between the media surface and the objective lens 2 by an output from a media tilt sensor (not shown). In this manner, the carriage 3 receives the acting force in the direction of arrow B generated by the tilt direction fine movement driving means 9 and
The optical pickup 1 supported by the vibration isolating rubbers 5a and 5b moves slightly with respect to the carriage 3 in the tilt direction.

Therefore, in the first embodiment, aberration of the beam spot converged on the media surface can be removed, and good and reliable recording / reproduction can be performed. In addition, since it is not necessary to perform tilt control together with the seek rail 4 as in the related art, there is no increase in the thickness of the apparatus due to interference between the loading mechanism and the tilt mechanism as in the related art, and the entire apparatus can be reduced in size. Become.

In the two vibration isolating rubbers 5a and 5b arranged at a distance in the seek direction, the vibration isolating rubber 5a provided on the side wall near the installation portion of the objective lens 2 in the optical pickup 1 and the light isolating rubber 5a Anti-vibration rubber 5b provided on the side wall of pickup 1 distant from the installation portion of objective lens 2
The elastic modulus (spring constant) of the optical pickup 1 is changed, and the anti-vibration rubber 5a provided on the side wall near the installation portion of the objective lens 2 in the optical pickup 1 is provided on the side wall remote from the installation portion of the objective lens 2. It is set to be harder than the anti-vibration rubber 5b. For this reason, the anti-vibration rubber 5b provided on the side wall distant from the installation part of the objective lens 2 is relatively soft.
Driving in the direction indicated by the arrow B in the optical pickup 1 provided with the tilt direction fine movement driving means 9 is enabled by flowing a low current to the coil 10 of the tilt direction fine movement driving means 9. Further, since the vibration isolating rubber 5a provided on the side wall near the installation portion of the objective lens 2 is relatively hard, the objective lens 2 is prevented from moving in the focus direction when driven by the tilt direction fine movement driving means 9. be able to.

Therefore, the tilt control can be performed by the low current, and furthermore, since there is no influence of the tilt control, the movable range of the objective lens 2 in the focus direction can be reduced, and the apparatus can be made thinner as a whole. .

FIG. 2 is a partially cutaway perspective view of an optical pickup device for explaining a second embodiment of the present invention. Members corresponding to those described with reference to FIG. 1 are the same. Reference numerals are used and detailed description is omitted.

The second embodiment differs from the first embodiment in a plurality of points (two examples are shown in FIG. 2).
And the tilt direction fine movement drive means 6 and the tilt direction fine movement drive means 9 are arranged substantially symmetrically about the center of gravity G of the optical pickup 1 respectively, and an elastic support for supporting the optical pickup 1 on the carriage 3 is provided. As a member, a plurality of wires 20a, 20b extending in a direction orthogonal to a seek direction (arrow A direction) and a tilt direction (arrow B direction)
And one end of each of the wires 20a and 20b is fixed to a protrusion 21 extending on a line passing through the center of gravity G of the optical pickup 1.

The polarity (magnetized state) of each of the magnets 8 and 11 in the seek direction fine movement driving means 6 and the tilt direction fine movement driving means 9 in the installation relationship shown in FIG.
It is like the explanatory view shown in FIG.

In the second embodiment, similarly to the first embodiment, the seek direction fine movement driving means 6 and the tilt direction fine movement driving means 9
Accordingly, the optical pickup 1 can be finely moved, and the tilt control can be performed with the center of gravity G of the optical pickup 1 as a center, so that the efficiency of the driving current can be improved. Further, since the wire support point (projection 21), the center of gravity G, and the electromagnetic action point in the optical pickup 1 coincide with each other, no moment is generated during seek control and when tilt control is not performed. Therefore, stable control becomes possible.

The optical pickup 1 is supported on the carriage 3 by the wires 20a and 20b,
A plurality of wires 20a,
Since the variation of the elastic modulus in each of the individual parts 20b is reduced, the above-described respective controls are performed stably.

By the way, usually, the installation side of the objective lens 2 in the optical pickup 1 is heavy due to the installation of the objective lens driving device. Therefore, if the center of gravity G is set to the center of the support of the wire, In order to balance the weight with the lens driving device, it is necessary to install a balancer, which makes the entire device heavier.

Therefore, in the second embodiment, the wire 20
a and 20b, a wire 20a provided on the side wall near the installation portion of the objective lens 2 in the optical pickup 1
The elastic modulus (spring constant) of the wire 20b provided on the side wall of the optical pickup 1 distant from the installation portion of the objective lens 2 is changed, and is provided on the side wall near the installation portion of the objective lens 2 in the optical pickup 1. The weight of the wire 20a is set to be harder than the wire 20b provided on the side wall remote from the installation portion of the objective lens 2 so that the weight of the optical pickup 1 is equivalently balanced.

With this configuration, the optical pickup 1 can be supported so as to be parallel to the seek rail 4 without providing a conventional balancer.
Further, since the weight of the optical pickup 1 can be reduced, control with good responsiveness and low current consumption can be performed.

FIG. 4 is an exploded perspective view of an optical pickup device for explaining a third embodiment of the present invention. Members corresponding to those described with reference to FIG. Is omitted.

In the third embodiment, two elastic support members for supporting the side portions of the optical pickup 1 extend in a direction orthogonal to a seek direction (arrow A direction) and a tilt direction (arrow B direction). Using leaf springs 30a, 30b of
One ends of the leaf springs 30a and 30b are fixed to an attachment portion 31 provided on a line passing through the center of gravity G of the optical pickup 1, and the other ends of the leaf springs 30a and 30b are fixed to both ends of a flat base material 32. Further, the base material 32 is attached to the upright wall portion 33 of the carriage 3.
Are rotatably supported by a rotation support pin 35 that penetrates a receiving hole 34 provided in the base member 32, and a rotation support pin 35, which is the center of rotation of the base material 32, is installed near the objective lens 2.

A yoke 36 and a magnet 37 are provided on the inner bottom surface of the carriage 3, and a magnetic path portion between the yoke 36 and the magnet 37 in the optical pickup 1 is provided with a tilting coil 38 for fine movement in the seek direction and a tilt. A coil 39 for fine movement in direction is provided.

In the third embodiment, the current flowing through the seek direction fine movement coil 38 is controlled based on the seek direction fine movement control signal, and the seek direction fine movement coil 38, the yoke 36, and the magnet 37 are controlled during the seek control. By the electromagnetic action, the optical pickup 1 is slightly moved in the seek direction A against the elastic force of the leaf springs 30a and 30b. Further, a current flowing through the tilt direction fine movement coil 39 is controlled based on the tilt direction fine movement control signal. At the time of tilt control, the optical pickup 1 is moved by the electromagnetic action of the tilt direction fine movement coil 39, the yoke 36, and the magnet 37. , The rotation support pin 35 via the leaf springs 30 a and 30 b and the base material 32.
Is slightly rotated about.

As described above, in the third embodiment, the magnet 37 constituting the seek direction fine movement driving means and the tilt direction fine movement driving means is made common instead of being independent.
In addition, since seek control and tilt control can be performed independently, small and stable control can be performed. Further, at the time of tilt control, the objective lens 2 is controlled at the center of the principal point, so that the tilt control does not cause a displacement of the objective lens 2 in the focus and tracking directions. Therefore, good focus and tracking control can be performed.

FIG. 5 is an exploded perspective view of an optical pickup device for explaining a fourth embodiment of the present invention. Members corresponding to those described with reference to FIG. Is omitted.

In the fourth embodiment, a plurality of optical pickups 1 extend in the seek direction (the direction of arrow A) with respect to the carriage 3 and are vertically arranged on a support upright wall 41 provided on the carriage 3. In this configuration, two piezo elements 40a and 40b (shown in FIG. 5) are displaceably supported, and the piezo elements 40a and 40b are extendable in the seek direction.

The degree of expansion and contraction of the piezo elements 40a and 40b differs depending on the value of the applied voltage. Control based on signals.

For example, at the time of seek control, as shown in FIG. 6 (a), the same voltage is applied to the upper and lower piezo elements 40a and 40b, so that both piezo elements 40a and 40b are applied.
b extends, and the optical pickup 1 slightly moves in the seek direction A. In the case of upward tilt control, FIG.
As shown in (b), the upper piezo element 40a is contracted,
By controlling the voltage application so as to extend the lower piezo element 40b, the objective lens 2 of the optical pickup 1 rotates upward about the piezo elements 40a and 40b. In the case of downward tilt control, FIG.
As shown in (c), the lower piezo element 40b is contracted,
Further, by extending the upper piezo element 40a, the objective lens 2 of the optical pickup 1 is rotated downward about the piezo elements 40a and 40b.

As described above, in the fourth embodiment, it is possible to perform the fine movement drive in the seek direction and the fine movement in the tilt direction by using the piezo elements 40a and 40b, so that the drive structure has a small size and excellent followability. can do.

[0049]

As described above, according to the present invention,
In addition to the seek drive means, the seek direction fine movement drive means for finely moving the optical pickup in the seek direction is provided. Therefore, it is possible to prevent a deviation of the optical axis of the objective lens with respect to the optical disk, and it is possible to perform good recording / reproduction.

Further, by providing a seek direction fine movement driving means for finely moving the optical pickup in the seek direction and a tilt direction fine movement driving means for finely moving the optical pickup in the tilt direction, the entire optical pickup is provided. Can be finely moved in the seek direction and the tilt direction, so that the optical axis deviation of the objective lens with respect to the optical disk and the aberration of the beam spot on the optical disk can be removed, and good recording / reproduction can be performed.

Further, the elastic support member near the objective lens is made harder than the elastic support member at a position distant from the objective lens, so that the objective lens does not move in the focus direction even when the fine movement driving means is operated. It is possible,
The amount of change due to tilt control at the height position of the objective lens can be eliminated. Further, since the objective lens side, which tends to be heavy in the optical pickup, can be reliably supported by a relatively hard elastic support member, the weight can be balanced without using a balancer or the like. It becomes possible to make it lighter.

Further, by using a rubber-based member for the elastic support member, the operating characteristics of the device can be stabilized by the vibration-proof effect of rubber.

Further, by using a wire as the elastic supporting member, the variation in the elastic modulus of the supporting portion is reduced as compared with the rubber-based member, so that the operating characteristics of the device can be stabilized.

Further, the plurality of seek direction fine movement driving means and the tilt direction fine movement driving means are disposed substantially symmetrically with the center of gravity of the optical pickup being substantially at the center, so that the seek direction fine movement driving and the tilt direction fine movement driving can be performed. In this case, since an unnecessary moment can be prevented from being generated, the operation characteristics of the device can be stabilized.

Further, both sides of the optical pickup are displaceably supported by at least two plate springs parallel to each other with respect to the substrate, the substrate is rotatably supported by the carriage, and the carriage is provided with a yoke and a magnet. By providing a coil for seek direction fine movement and a coil for tilt direction fine movement in the magnetic path between the yoke and the magnet in the optical pickup, the seek direction fine movement drive and the tilt direction fine movement drive are performed by a single magnet. In addition, since the seek direction fine movement drive and the tilt direction fine movement drive can be performed independently, downsizing can be achieved.

Since the center of rotation of the substrate is set near the objective lens, the objective lens can be controlled at the center of the principal point even when the tilt control of the objective lens is performed. This prevents the objective lens from being displaced in the focus and tracking directions.

Further, since the optical pickup is displaceably supported by at least two piezo elements, fine drive in the seek direction and fine movement in the tilt direction can be performed by energizing the piezo elements. It can be a driving structure.

[Brief description of the drawings]

FIG. 1 is a partially cutaway perspective view of an optical pickup device for explaining a first embodiment of the present invention;

FIG. 2 is a perspective view showing a part of an optical pickup device for explaining a second embodiment of the present invention;

FIG. 3 is an explanatory diagram showing the polarity of each magnet according to a second embodiment of the present invention.

FIG. 4 is an exploded perspective view of an optical pickup device for explaining a third embodiment of the present invention.

FIG. 5 is an exploded perspective view of an optical pickup device for explaining a fourth embodiment of the present invention.

FIG. 6 is a diagram illustrating the operation of a piezo element according to a fourth embodiment of the present invention.

[Explanation of symbols]

 Reference Signs List 1 optical pickup 2 objective lens 3 carriage 5a, 5b anti-vibration rubber 6 seek direction fine movement driving means 7 coil of seek direction fine movement driving means 8 magnet of seek direction fine movement driving means 9 tilt direction fine movement driving means 10 coil of tilt direction fine movement driving means 11 Magnet of tilt direction fine movement drive means 20a, 20b Wire 30a, 30b Leaf spring 32 Base material 35 Rotation support pin 36 Yoke 37 Magnet 38 Coil for seek direction fine movement 39 Coil for tilt direction fine movement 40a, 40b Piezo element

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Hiroki Ikeda 1-3-6 Nakamagome, Ota-ku, Tokyo Stock inside Ricoh Company (72) Inventor Susumu Katagiri 1-3-6, Nakamagome, Ota-ku, Tokyo Stock F-term in Ricoh Company (reference) 5D117 AA02 CC01 CC04 GG03 JJ02 KK08 5D118 BA01 BB02 DC03 EA02 EC07 ED08 EE06 EF07 EF09 FA25 FA29 FB03 FB04 FB08 FB20

Claims (9)

[Claims] An optical pickup having an objective lens for irradiating an optical disk with a beam spot and recording / reproducing information on / from an optical disk, and a carriage for supporting the optical pickup and moving the optical pickup in a seek direction. An optical pickup device provided with: a seek direction fine movement driving means for displaceably supporting the optical pickup with respect to the carriage by an elastic support member, and finely moving the optical pickup in a seek direction. Optical pickup device. 2. An optical pickup having an objective lens for irradiating a beam spot on an optical disk and recording / reproducing information on / from the optical disk, and a carriage for supporting the optical pickup and moving the optical pickup in a seek direction. An optical pickup device comprising: an optical pickup that is displaceably supported by an elastic supporting member with respect to the carriage; and a seek direction fine movement driving unit that finely moves the optical pickup in a seek direction; and tilts the optical pickup. An optical pickup device comprising: tilt direction fine movement driving means for finely moving in a direction. 3. A plurality of elastic supporting members support a portion near the objective lens and a portion distant from the objective lens in the optical pickup, and the elastic supporting member near the objective lens is separated from the elastic supporting member at a portion distant from the objective lens. 3. The optical pickup device according to claim 1, wherein the optical pickup device is also hardened. 4. The optical pickup device according to claim 1, wherein said elastic support member is a rubber-based member. 5. The optical pickup device according to claim 1, wherein said elastic support member is a wire. 6. The light according to claim 2, wherein the plurality of seek direction fine movement driving means and the plurality of tilt direction fine movement driving means are arranged substantially symmetrically about a center of gravity of the optical pickup. Pickup device. 7. An optical pickup having an objective lens for irradiating a beam spot on an optical disk and recording / reproducing information on / from the optical disk, and a carriage for supporting the optical pickup and moving the optical pickup in a seek direction. An optical pickup device comprising: an optical pickup; and both sides of the optical pickup are displaceably supported on a substrate by at least two mutually parallel plate springs, and the substrate is rotatably supported on the carriage. An optical pickup device comprising: a yoke and a magnet; a magnetic path between the yoke and the magnet in the optical pickup; and a seek direction fine movement coil and a tilt direction fine movement coil. 8. The optical pickup device according to claim 7, wherein the center of rotation of the base material is set near the objective lens. 9. An optical pickup having an objective lens for irradiating a beam spot on an optical disc and recording / reproducing information on / from the optical disc, and a carriage for supporting the optical pickup and moving the optical pickup in a seek direction. In the optical pickup device provided with the optical pickup, the optical pickup is displaceably supported by the at least two piezo elements with respect to the carriage, each piezo element is provided so as to be able to expand and contract in the seek direction, and is vertically arranged in the seek direction. An optical pickup device, comprising: