JP2002197700A - Optical pickup device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To hold the optical axis direction of an objective lens nearly vertical to the signal recording face of an optical disk, even if the optical disk is warped. SOLUTION: An optical pickup device 4 has a fixed member 21 and four spring members 22 which are connected at each end to a movable member and the fixed member 21. A relation of θ1>θ2 exists between the angle θ1 formed mutually by the two spring members 22i supporting the inner peripheral part of the movable member and the angle θ2 formed mutually by the two spring members 22o supporting the outer peripheral part of the movable member. As a result, the combined spring constant of the two spring members supporting the inner peripheral part of the movable member is made larger than that of the two spring members supporting the outer peripheral part of the movable member; and, when the movable member is transferred in the focus direction in accordance with the warpage of a disk-like optical recording medium, an inclination is caused, making the optical axis direction of the objective lens nearly orthogonal to the signal recording surface of the disk-like recording medium.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a novel optical pickup device. More specifically, the present invention relates to a technique for improving deterioration of a reproduction signal with respect to a warp of a disk-shaped optical recording medium.

[0002]

2. Description of the Related Art In a disk drive apparatus for recording and reproducing signals on a disk-shaped optical recording medium (hereinafter, referred to as an "optical disk") such as an optical disk or a magneto-optical disk, a signal recording surface of the optical disk is used. An optical pickup device is provided for irradiating the optical disk with a light beam and detecting the return light reflected from the signal recording surface of the optical disk. For example, CD (Compact Disk)
An optical disk drive device such as a CD player or a DVD player that reproduces a signal recorded on an optical disk such as a DVD or a digital versatile disk (DVD) is provided independently, and records and / or records a signal on a magneto-optical disk. In a magneto-optical disk drive device for performing reproduction, it is provided in combination with a magnetic head device as an overwrite head.

[0003] By the way, when an optical disk is bonded with a different material or printed, for example, there is a problem with the heat shrinkage between a plurality of layers constituting the optical disk, or a handling condition such as a poor storage state. Warping may occur due to various problems such as problems.

If the optical disk is warped, the light beam condensed by the objective lens impinges obliquely on the signal recording surface. As a result, the light beam converges on the signal recording surface. The signal spreads in an elliptical shape, and the signal reading becomes unclear due to crosstalk, and a correct error signal cannot be obtained.

Therefore, when the objective lens is moved in the focus direction, a movable member supporting the objective lens is supported by a fixed member in order to change the angle of the objective lens in accordance with the angle of warp in the radial direction of the optical disk. The spring constant is changed by changing the wire diameter or thickness of the two spring members located on the inner peripheral side of the optical disk and the two spring members located on the outer peripheral side of the four spring members. Displacement and outer circumference of the inner peripheral side spring member when the same driving force is applied by changing the hardness and amount of the damper agent attached to the inner peripheral side spring member and the damper agent attached to the outer peripheral side spring member It is conceivable to change the displacement amount of the spring member on the side. In addition, changing the driving force applied to the movable member between the inner peripheral side and the outer peripheral side, for example, when a magnetic circuit is employed as means for driving the movable member, the strength of the magnetic field on the inner peripheral side and the outer peripheral side It is also conceivable to change.

[0006]

By the means described above, the objective lens is tilted in accordance with the warp of the optical disk in accordance with the movement of the objective lens in the focus direction, whereby the direction of the optical axis of the objective lens is changed. Although it can be kept substantially perpendicular to the signal recording surface of the optical disk, there is a problem that none of the means is practical.

[0007] For example, changing the wire diameter or thickness of the spring member increases the number of types of parts, and there is a problem that the management thereof becomes complicated. Further, changing the hardness or amount of the dumping agent has a problem that its management becomes difficult. Further, changing the driving force between the inner peripheral side and the outer peripheral side in the driving means has a problem that control becomes complicated and efficiency is deteriorated.

Accordingly, the present invention provides an optical disk with an optical axis that is substantially perpendicular to the signal recording surface of an optical disk even if the optical disk is warped without causing difficulties in parts management and deterioration of efficiency. The challenge is to keep

[0009]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, an optical pickup device according to the present invention has a support for supporting a movable member supporting an objective lens movably in a focus direction and a tracking direction with respect to a fixed member. The mechanism is
It comprises a fixed member, the movable member, and four spring members each having an end connected to the fixed member, wherein the movable member has an inner peripheral side and an outer peripheral side of the disk-shaped optical recording medium with respect to the objective lens. Are connected to two spring members positioned opposite each other in the vertical direction, and the angle θ1 formed by the two spring members supporting the inner peripheral side portion of the movable member and the angle θ1 of the movable member 2 for supporting the outer peripheral portion
The angle θ2 formed by the two spring members has a relationship of θ1> θ2, whereby the combined spring constant of the two spring members supporting the inner peripheral side portion of the movable member is reduced by the movable member. When the movable member is moved in the focus direction in accordance with the warp of the disk-shaped optical recording medium, the object is tilted when the movable member is larger than the combined spring constant of the two spring members supporting the outer peripheral portion. The optical axis direction of the lens is substantially perpendicular to the signal recording surface of the disk-shaped optical recording medium.

Therefore, in the optical pickup device of the present invention, the two spring members supporting the inner peripheral portion of the movable member supporting the objective lens and the two springs supporting the outer peripheral portion are formed. Even when the objective lens moves in the focus direction in accordance with the warp of the optical disk, the optical axis direction of the objective lens can be maintained substantially perpendicular to the signal recording surface of the optical disk by simply making the angles formed by the members different from each other. It does not require extra cost and labor, and does not reduce the efficiency of the driving force applying means.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the optical pickup device of the present invention will be described below with reference to the accompanying drawings.

FIG. 1 shows an outline of a disk drive device 1 in which an optical pickup device is used. The disk drive device 1 performs recording and / or reproduction of signals on a disk-shaped optical recording medium (hereinafter, referred to as “optical disk”) 2, and includes a disk rotating device 3 and an optical pickup device 4.

The optical disk 2 is a CD-R
OM (Compact Disk Read Only Memory), CD-R (Comp
act Disk Recordable), CD-RW (Compact Disk Rewr
itable), DVD-ROM (Digital Versatile Disk Rea)
d Only Memory), DVD-RW (Digital Versatile Dis
Various types of optical disks, such as an optically readable disk such as a k-rewritable disk, a magneto-optical disk, and a phase-change disk, can be cited, and the recording method and size of the present invention do not matter.

The disk drive 1 includes a device dedicated to reproduction or recording as well as a device capable of both reproduction and recording, and it does not matter whether it is stationary or portable in its use form. .

In the disk drive 1, the optical disk 2 is rotated by the disk rotating device 3, and the optical pickup device 4 which moves in the radial direction of the rotating optical disk 2 outputs a signal to the optical disk 2. Recording and / or reading are performed.

The disk rotating device 3 includes a spindle motor 6 arranged on a chassis 5 and a turntable 7 rotated by the spindle motor 6. The optical disk 2 rotates while being held on the turntable 7. Is done.

The optical pickup device 4 is formed on a slide base 8. The slide base 8 is provided on the optical disk 2 held on the turntable 7 by a guide shaft 9 and a feed screw 10 provided on a chassis 5. It is free to move in the radial direction. That is, one end 8a of the slide base 8 is slidably engaged with the guide shaft 9,
The other end 8 b of the slide base 8 is screwed to the feed screw 10. Then, the feed screw 10 is rotated by the feed motor 11, and the feed screw 10 rotates,
The other end 8 b of the slide base 8 is fed in the axial direction of the feed screw 10, that is, in the radial direction of the optical disc 2 on the turntable 7.
a is also slid in the same direction, and as a result, the optical pickup device 4 moves in the radial direction of the optical disk 2 on the turntable 7.

FIG. 1 shows an example of a mechanism for feeding the optical pickup device 4 in the radial direction of the optical disk 2 on the turntable 7. The mechanism for feeding in the radial direction is not limited to that shown in FIG.

FIG. 2 schematically shows the structure of the optical pickup device 4.

The optical pickup device 4 includes the laser light source 1
2, for example, a semiconductor laser, a photodetector 13, a beam splitter 14, a rising mirror 15, and an objective lens 16.

The laser light 17 output from the laser light source 12 is transmitted through the beam splitter 14, its optical path is raised by 90 ° by the rising mirror 15, and focused on the signal recording surface of the optical disk 2 by the objective lens 16. The reflected laser beam 18 reflected by the signal recording surface of the optical disk 2 is
Is reflected by the beam splitter 14 and received by the photodetector 13. By receiving the reflected laser beam 18 by the photodetector 13, a focus error signal and a tracking error signal are obtained, and a reproduction signal is obtained at the time of reproduction. Then, by processing the reproduction signal, the signal recorded on the signal recording surface of the optical disk 2 is read (reproduced).

The objective lens 16 is moved in the focus direction by the biaxial actuator 19, ie, in the direction in which the objective lens 16 is separated from the signal recording surface of the optical disk 2 held in the turntable 7, and in the tracking direction, ie, held in the turntable 7. The optical disk 2 is supported so as to be movable in a direction parallel to the signal recording surface of the optical disk 2.

The biaxial actuator 19 has a movable member 20 on which the objective lens 16 is supported. The movable member 20 includes suspensions (spring members) 22, 22,... Made of thin elastic wires on a support portion 21 which is a fixed member fixed to the slide base 8.
Are supported movably in the focus direction (see arrow F in FIG. 2) and the tracking direction (see arrow T in FIG. 2). A magnetic circuit is formed in the two-axis actuator 19, and the magnetic circuit is driven based on a focus error signal and a tracking error signal obtained from the photodetector 13, whereby the movable member 20 The laser beam 17 which is slightly moved in the direction and the tracking direction and is irradiated on the signal recording surface of the optical disc 2 by the objective lens 16 traces the recording track or the guide groove formed on the signal recording surface, and also records the recording track or the guide. The focus is controlled on the groove for use.

The configuration of the optical pickup device 4 shown in FIG. 2 shows a basic configuration, and various changes can be made. For example, a laser light source 12 and a photodetector 13
Instead of separately providing a laser light source and a photodetector, use a laser coupler integrally packaged, or interpose an optical element other than the above in the optical path from the laser light source through the optical disk to the photodetector. Alternatively, a change such as removing some of the above optical elements is possible.

The optical pickup device according to the present invention has two components.
The shaft actuator 19 is characterized. The details of the biaxial actuator 19 are shown in FIGS.

The movable member 20 is made of synthetic resin.
3 and the bobbin 24 are integrally formed. The lens holder 23 has a substantially cubic shape, and the objective lens 16 is supported by a mounting hole (not shown) formed vertically penetrating the center thereof. The bobbin 24 is formed so as to surround the lens holder 23.
Insertion holes 20a, 20a are formed between the end face on the side orthogonal to the tracking direction. The bobbin 24 has a focus coil 25 surrounding the entire body.
Are wound, and tracking coils 26, 26,... Are provided on the end face on the side orthogonal to the tracking direction.
・ Attached.

A supporting portion 21 is fixed to the upper surface of the slide base 8, and the movable member 20 is supported by the supporting portion 21 by four spring members 22, 22,.

The spring members 22, 22,... Are all of the same material and have the same wire diameter, and have the same spring constant. The movable member 20 is a side surface 20 located on the inner peripheral side of the optical disk 2 held on the turntable 7.
b and the side surface 20c located on the outer peripheral side are supported by two spring members 22, 22,... respectively. The two spring members 22i, 22i supporting the inner peripheral side surface 20b of the movable member 20 have an angle with each other so that the interval between the two spring members 22i is wide at the end of the support portion 21 and narrow at the end of the movable member 20. And two spring members 22o, 22o supporting the outer peripheral side surface 20c of the movable member 20.
Are positioned at the same distance between the support portion side end and the movable member 20 side end, that is, in parallel. As a result, the angle θ1 formed between the two spring members 22i and 22i supporting the inner peripheral side surface 20b of the movable member 20 is equal to the two spring members 2 supporting the outer peripheral side surface 20c of the movable member 20.
2o, 22o is made larger than the angle θ2 (= 0) made by each other, whereby the two inner peripheral spring members 22i, 22o,
The combined spring constant of 22i is set larger than the combined spring constant of the two outer peripheral spring members 22o and 22o.

Then, a plane S (hereinafter, referred to as a plane) on which the disk mounting surface 7a (see FIGS. 5 and 6) of the turntable 7 is located.
When the laser beam 17 is focused on the signal recording surface of the optical disc 2 with the lower surface 2a positioned on the “reference plane”, the optical axis direction of the objective lens 16 is
Are set so as to be orthogonal to the signal recording surface.

The yokes 27, 27 made of a magnetic material are fixed to the upper surface of the slide base 8. The yoke 2
Reference numeral 7 denotes an inner yoke 27a and an outer yoke 27b
The inner yokes 27a, 27a of the yokes 27, 27 are inserted into the insertion holes 20a, 20a of the movable member 20, and the outer yokes 27b, 27b of the outer yokes 27b, 27b. Each of the coils 25, 2
The magnets 28, 2
8 is fixed.

The coils 25, 26, 26,
.., Yoke 27, 27 and magnets 28, 28 constitute driving force applying means 29 for applying a driving force to movable member 20.

Therefore, the driving current based on the tracking error signal is applied to the tracking coils 26, 2
6, the movable member 20 is moved in a predetermined direction in the tracking direction T (see FIG. 2) according to the direction of the drive current. When a drive current based on the focus error signal is supplied to the focus coil 25, the movable member 20 is moved in a predetermined direction in the focus direction F (see FIG. 2) according to the direction of the drive current. You.

As shown in FIG. 5, when the optical disk 2 has a warp in which the outer peripheral portion is located above the inner peripheral portion, as the objective lens 16 moves toward the outer peripheral side of the optical disk 2, The lens 16 is moved upward. That is, the driving force Fu for moving the movable member 20 upward is applied by the driving force applying means 29 described above. By the external driving force Fu, the spring members 22, 22,.
Is bent upward, and the movable member 20, that is, the objective lens 16 is moved upward. As described above,
Since the combined spring constant Ki of the two inner peripheral spring members 22i, 22i is set to be greater than the combined spring constant Ko of the two outer peripheral spring members 22o, 22o, they have the same driving force. Since the deflection amount when Fu is added is different, the displacement amount of the tip, that is, the portion supporting the movable member 20, that is, the displacement amounts Xi and Xo of the inner peripheral side and the outer peripheral side of the movable member 20 are different. become. That is, the displacement Xo on the outer peripheral side Xo = Fu / Ko with respect to the displacement Xi on the inner peripheral side of the movable member 20 = Fu / Ki, where Ki
> Ko, Xi <Xo, and the movable member 20 is more displaced upward on the outer peripheral side than on the inner peripheral side.
The movable member 20 is inclined so that the upper surface thereof faces the inner peripheral side of the optical disk 2, whereby the movable member 20
The optical axis direction of the objective lens 16 supported by the optical disk 2 is kept substantially perpendicular to the signal recording surface of the optical disk 2.

As shown in FIG. 6, when the optical disk 2 has a warp in which the outer peripheral portion is located below the inner peripheral portion, the drive is performed as the objective lens 16 moves toward the outer peripheral side of the optical disk 2. The movable member 20 is
, A driving force Fd for moving downward is applied.
The amounts of displacement Xi '(inner circumference) and Xo' (outer circumference) of the movable member 20 in the downward direction on the inner and outer peripheral sides of the movable member 20 are represented by
Xi '= Fd / Ki, Xo' = Fd / Ko, respectively, and the composite spring constant Ki of the inner peripheral side spring members 22i, 22i and the composite spring constant Ko of the outer peripheral side spring members 22o, 22o are Ki> Ko. Therefore, Xi ′ <Ko ′ holds, and the movable member 20 is displaced more downward on the outer peripheral side with respect to the inner peripheral side. Therefore, the movable member 20 is tilted so that the upper surface thereof faces the outer peripheral side of the optical disk 2. As a result, the optical axis direction of the objective lens 16 supported by the movable member 20 is kept substantially perpendicular to the signal recording surface of the optical disk 2.

In the optical pickup device 4 described above, even when the optical disk 2 is warped, if the objective lens 16 moves in the focus direction in accordance with the warp,
The direction of the optical axis of the objective lens 16 is tilted in accordance with the warp of the optical disk 2, and as a result, the direction of the optical axis of the objective lens 16 is always kept substantially perpendicular to the signal recording surface of the optical disk 2, and a good reproduction signal is obtained. And an error signal can be obtained.
In addition, as a configuration for this, an angle θ1 formed by the two spring members 22i, 22i that support the inner peripheral portion of the movable member 20 and two springs that support the outer peripheral portion of the movable member 20 are provided. The angle 22 formed by the members 22o and 22o is merely set to satisfy the relationship of θ1> θ2, and all the spring members 22 having exactly the same wire diameter and the same spring constant are used. This eliminates the need for complicated and troublesome management such as managing two or more types of spring members having different spring constants and managing the hardness and amount of the damper material. No damage.

In the embodiment described above, of the spring members supporting the movable member 20, the spring member 22i located on the inner peripheral side of the optical disk 2 on the turntable 7 with respect to the objective lens 16 is used. , 22i are arranged so as to have an angle θ1 with each other, and a spring member 22
o and 22o are arranged parallel to each other (the angle θ2
= 0), whereby the inner peripheral side spring members 22i, 22
i is a combined spring constant Ki of the outer peripheral side spring member 22.
Although the combined spring constant Ko of o and 22o is made larger than the combined spring constant Ko on the inner peripheral side, the configuration for making the combined spring constant Ki on the outer peripheral side larger than the combined spring constant Ko on the outer peripheral side is not limited to the above.

FIGS. 7 to 11 show examples of the arrangement of two spring members 22i, 22i for increasing the combined spring constant Ki on the inner peripheral side. 7 to 11, the line HH indicates a reference line, and the reference line is parallel to the plane on which the disk mounting surface 7a of the turntable 7 is located (there is no warpage held on the turntable 7). This is a line that is also parallel to the signal recording surface of the optical disk 2) and that is substantially orthogonal to the radial direction of the optical disk 2 held on the turntable 7. Then, the above-mentioned outer peripheral side spring members 22o, 22o
Are arranged in parallel to the reference line HH.

FIG. 7 shows two spring members 22.
Both i and 22i have an angle with respect to the reference line HH, and are inclined such that the interval between them is wide on the distal end side and narrow on the proximal end side. In addition, the front end side is a side supporting the movable member 20, and the base end side is a side fixed to the support portion 21.

FIG. 8 shows the upper spring member 22.
i is made parallel to the reference line HH, and the lower spring member 22i
Has an angle with respect to the reference line HH, and has two spring members 2
The interval between 2i and 22i is narrow on the distal end side and wide on the proximal end side.

FIG. 9 shows the upper spring member 22.
i is made parallel to the reference line HH, and the lower spring member 22i
Has an angle with respect to the reference line HH, and has two spring members 2
The interval between 2i and 22i is wide at the distal end and narrow at the proximal end.

FIG. 10 shows the lower spring member 2.
2i is made parallel to the reference line H-H, and the upper spring member 22
i has an angle with respect to the reference line H-H, and the interval between the two spring members 22i is narrower on the distal end side and wider on the proximal end side.

FIG. 11 shows the lower spring member 2.
2i is made parallel to the reference line H-H, and the upper spring member 22
i has an angle with respect to the reference line HH, and the interval between the two spring members 22i is wide on the distal end side and narrow on the proximal end side.

The two spring members 2 shown in FIGS. 7 to 11
In each of the arrangement examples 2i and 22i, the combined spring constant can be increased as compared with the case where two spring members are arranged in parallel with each other. In short, by arranging the two spring members 22i and 22i so as to have an angle with each other, the combined spring constant can be increased by arranging the two spring members 22i in parallel with each other (at an angle of 0). , 22i is not particularly limited.

In the above-described embodiment, the outer peripheral side spring members 22o, 22o are arranged in parallel to each other. However, the outer peripheral side spring members 22o, 22o are also arranged so as to have an angle with each other. One of them may be inclined with respect to the reference line HH. However, the outer peripheral side spring member 22o,
An angle θ2 formed between the spring members 22o is an inner peripheral side spring member 22.
It is essential that i and 22i are smaller than the angle θ1 formed by each other.

In the above embodiment, all four spring members supporting the movable member are made of the same material, have the same wire diameter, and have the same spring constant. Even if the material and wire diameter of the two spring members are different and the spring constants are different, the angle formed by the two spring members supporting the inner peripheral side portion of the movable member and the two By simply changing the angle formed by the spring members, the combined spring constants on the inner and outer circumferences can be changed, thereby moving the objective lens in the focus direction according to the warp of the optical disc. Even in this case, the direction of the optical axis of the objective lens can be kept substantially perpendicular to the signal recording surface of the optical disk.

Further, the shapes and structures of the respective parts shown in the above-described embodiments are merely examples of the specific embodiments to be carried out when carrying out the present invention, and the technical scope of the present invention is not limited thereto. Should not be interpreted restrictively.

[0047]

As is apparent from the above description, the optical pickup device of the present invention has a movable objective lens supporting an objective lens for condensing and irradiating a light beam from a light source onto a signal recording surface of a disk-shaped optical recording medium. A member, a supporting mechanism that movably supports the movable member in the focus direction and the tracking direction with respect to the disc-shaped optical recording medium,
An optical pickup device including a driving force applying unit that applies a driving force to the movable member, wherein the support mechanism includes:
The movable member comprises a fixed member, four movable members each having an end connected to the fixed member, and the movable member includes an inner peripheral side and an outer peripheral side of the disk-shaped optical recording medium with respect to an objective lens. The two sides of the movable member are connected to two spring members that are opposed to each other in the vertical direction, and the two spring members that support the inner peripheral portion of the movable member form an angle θ1 between the two spring members and the movable member. And the angle θ2 formed by the two spring members supporting the outer peripheral portion is θ1> θ2.
With this relationship, the combined spring constant of the two spring members supporting the inner peripheral portion of the movable member is changed to the combination of the two spring members supporting the outer peripheral portion of the movable member. When the movable member moves in the focusing direction according to the warp of the disk-shaped optical recording medium, the movable member is tilted so that the optical axis direction of the objective lens is used for signal recording on the disk-shaped optical recording medium. It is characterized by being substantially perpendicular to the plane.

Therefore, in the optical pickup device of the present invention, the angle formed by the two spring members supporting the inner peripheral side portion of the movable member supporting the objective lens and the two spring members supporting the outer peripheral side portion are formed. Even when the objective lens moves in the focus direction in accordance with the warp of the optical disk, the direction of the optical axis of the objective lens can be maintained substantially perpendicular to the signal recording surface of the optical disk by simply making the angles formed by the members different from each other. It does not require extra cost and labor, and does not reduce the efficiency of the driving force applying means.

According to the second aspect of the present invention, the four spring members are made of the same material, have the same wire diameter, and have the same spring constant. There is no need to prepare, the material cost is reduced, and the management of parts becomes easy, so that the optical pickup device can be provided at low cost.

[Brief description of the drawings]

FIG. 1 is a schematic perspective view showing an example of a disk drive device using an optical pickup device.

FIG. 2 is a schematic diagram illustrating a general configuration example of an optical pickup device.

3 shows an embodiment of the optical pickup device of the present invention together with FIG. 4, and is a perspective view seen from obliquely above in the inner circumferential direction of the optical disc.

FIG. 4 is a perspective view of the optical disk viewed from obliquely above in the outer peripheral direction.

FIG. 5 is a schematic side view showing an operation when used for an optical disk whose outer peripheral side is warped upward.

FIG. 6 is a schematic side view showing an operation when used for an optical disk whose outer peripheral side is warped downward.

7 is a schematic side view showing an arrangement example of two inner peripheral spring members together with FIG. 8 to FIG. 11, and FIG. 7 shows a second arrangement example.

FIG. 8 shows a third arrangement example.

FIG. 9 shows a fourth arrangement example.

FIG. 10 shows a fifth arrangement example.

FIG. 11 shows a sixth arrangement example.

[Description of Signs] 2 ... optical disk (disk-shaped optical recording medium), 4 ...
Optical pickup device, 12 laser light source (light source), 1
6 ... objective lens, 17 ... laser light (light beam), 20 ...
Movable member, 21: support portion (fixed member), 22i: inner peripheral side spring member, 22o: outer peripheral side spring member, 29: driving force applying means, F: focus direction, T: tracking direction

Claims (2)

[Claims] 1. A movable member supporting an objective lens for converging and irradiating a light beam from a light source onto a signal recording surface of a disc-shaped optical recording medium, and focusing the movable member on the disc-shaped optical recording medium. An optical pickup device comprising: a support mechanism movably supported in a direction and a tracking direction; and a driving force applying unit for applying a driving force to the movable member, wherein the support mechanism includes a fixed member, the movable member, The movable member has four portions each of which is located on an inner peripheral side and an outer peripheral side of the disk-shaped optical recording medium with respect to an objective lens. The angle θ1 formed by the two spring members supporting the inner peripheral portion of the movable member and the outer periphery of the movable member are connected to the two spring members that are opposed to each other in the vertical direction. The two spring members for supporting the portion has the relationship between the angle .theta.2 which form mutually .theta.1> .theta.2, thereby supporting the inner peripheral portion of the movable member 2
The combined spring constant of the two spring members is set to be larger than the combined spring constant of the two spring members supporting the outer peripheral side portion of the movable member, and the movable member is adapted to warp the disk-shaped optical recording medium. An optical pickup device characterized in that the optical pickup device is tilted when moved in the focusing direction so that the direction of the optical axis of the objective lens is substantially perpendicular to the signal recording surface of the disk-shaped optical recording medium. 2. The optical pickup device according to claim 1, wherein the four spring members are made of the same material, have the same wire diameter, and have the same spring constant.