JPH11154340A - Objective lens drive assembly and disk device using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To suppress all vibrations of rolling, pitching and yawing with a simple structure and to facilitate assembly. SOLUTION: A gap part 19 is disposed between a stationary part substrate 10 and a stationary part holder 9 in such a manner that the part supporting the end of an elastic supporting member 12 of the stationary part substrate 10 is made contactless with the stationary part holder 9. A UV curing resin 14 or IR curing resin or thermosetting resin is admitted into at least part of this gap part 19 and is cured. The stationary part substrate 10 and the stationary part holder 9 facing each other are connected by this resin in the gap part 19.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an objective lens driving device used for a recording and / or reproducing apparatus for a disk-shaped recording medium such as an optical disk or a magneto-optical disk, and a disk device using the same.

[0002]

2. Description of the Related Art In an optical disk device such as a CD or MD or a magneto-optical disk device, recording and / or recording of an information signal is performed.
Alternatively, an objective lens driving device is usually used for reproduction.
Generally, an objective lens driving device has a driving mechanism in a focusing direction for focusing a light spot on a disk surface and a driving mechanism in a tracking direction for positioning the light spot on a specific track.

FIG. 18 is a perspective view of a conventional objective lens driving device. As shown in FIG. 18, in the objective lens driving device 50, a focusing coil 53, a tracking coil 54, and a small substrate 55 are mounted on a lens holder 52 on which an objective lens 51 is mounted. The lens holder 52 is cantilevered by four elastic support members 56 joined to the small substrate 55.

On the other hand, two magnets 59 corresponding to the focusing coil 53 and the tracking coil 54 are mounted on the base yoke 60.
Further, a fixed part holder 57 to which a fixed part substrate 58 is adhered is attached to the base yoke 60, and the other end of the elastic support member 56 is joined to the fixed part substrate 58. The viscoelastic material receiving port 61 provided in the fixed part holder 57 is filled with a viscoelastic material 62 having an action of damping or absorbing vibration, and the elastic support member 56
It plays a role in reducing unnecessary vibrations.

In the present driving device, a current is supplied to the focusing coil 53 and the tracking coil 54 via the fixed portion substrate 58, the elastic support member 56, and the small substrate 55, so that the current is supplied to the magnetic flux generated by the magnetic circuit. An electromagnetic force is generated in the objective lens 51 (lens holder 5).
2) is driven in the focusing direction 63 and the tracking direction 64.

[0006]

In the objective lens driving device, the thrust center of the focusing coil 53 (the position of the combined vector of all thrusts), the thrust center of the tracking coil 54, and the movable portion (supported by the elastic support member 56) Objective lens 51, lens holder 52, focusing coil 53, tracking coil 54, small substrate 55,
It is desirable that the center of gravity of the movable portion and the center of support of the movable portion (the intersection of the diagonal lines of the four joining points between the elastic support members and the movable portion) all match. However, in practice, inconsistencies arise between them due to design constraints, component variations, assembly variations occurring in the manufacturing process, and the like.
In this case, unnecessary vibration occurs due to the thrust of the focusing coil and the tracking coil, which causes a problem that control of the objective lens driving device becomes difficult.

FIGS. 19 to 21 are schematic explanatory diagrams of moments generated in the objective lens driving device. In the figure, reference numeral 66 denotes a movable portion, and 67 denotes an elastic support member. Here, the center of gravity (denoted by G in the drawing) of the movable portion 66 and the support center of the movable portion 66 (each elastic support member 67 and the movable (Intersection of the diagonal line of the four junctions with the part 66). The X-axis corresponds to the tracking direction, the Y-axis corresponds to the focusing direction, and the O-axis corresponds to the extending direction of the elastic support member 67. The center of gravity G of the movable part is the origin of the present coordinate system.

As shown in FIG. 19, when the center F of the focusing thrust is displaced in the X-axis direction (tracking direction) with respect to the center of gravity G of the movable part, the movable part 66 is rotated around the O-axis by the focusing thrust. Is generated. As a result, unnecessary vibration about the O axis occurs in the movable portion 66 (rolling). Rolling also occurs when the center of the tracking thrust is displaced from the center of gravity G of the movable part in the Y-axis direction (focusing method).

On the other hand, as shown in FIG. 20, when the center F of the focusing thrust is displaced from the center of gravity G of the movable portion in the O-axis direction (extending direction of the elastic support member), the movable thrust is caused by the focusing thrust. A moment M1 around the X axis is generated in the portion 66. As a result, unnecessary vibration around the X axis is generated in the movable portion 66 (pitching).

Further, as shown in FIG. 21, when the center T of the tracking thrust is displaced in the O-axis direction (extending direction of the elastic support member) with respect to the center of gravity G of the movable portion, the movable thrust is generated by the tracking thrust. The portion 66 has a moment M about the Y axis.
2 occurs. As a result, unnecessary vibration around the Y axis is generated in the movable portion (yaw).

Conventionally, as described with reference to FIG. 18, a configuration has been adopted in which a part of the elastic support member 56 is covered with a viscoelastic material 62 in order to reduce the unnecessary vibration. However, this configuration has a problem that although the vibration damping effect is large for rolling, the vibration damping effect is small for pitching and yawing because the resistance of the viscoelastic material to the elastic support member is small.

On the other hand, in the objective lens actuator disclosed in Japanese Patent Application Laid-Open No. Hei 8-87763, FIG.
As shown in (2), the cross-sectional area of the elastic support member 56 in the viscoelastic material 62 filled in the fixed portion holder 57 is partially enlarged (enlarged cross-sectional portion 56a), and the resistance of the viscoelastic material 62 to the elastic support member 56 is increased. , The vibration damping effect on pitching and yawing is improved. However, in this configuration, although the vibration damping effect increases as the cross-sectional area of the enlarged cross-section 56a increases, it is extremely difficult to provide a large-area enlarged cross-section in a part of the elastic support member 56. It was difficult to obtain a large vibration damping effect on pitching and yawing.

On the other hand, in a disk drive using an objective lens driving device in which the above-mentioned unnecessary vibration is not sufficiently removed, the servo characteristics of the feedback loop are not stabilized at a specific frequency, and the servo of focusing or tracking is deviated. was there.

In view of the above, an object of the present invention is to provide an objective lens driving device having a simple structure and an excellent vibration damping effect against all vibrations of rolling, pitching and yawing.
It is another object of the present invention to provide a disk device having good servo characteristics using the same.

[0015]

In order to achieve the above object, in the objective lens driving device of the present invention, the objective lens is held by a lens holder for holding the objective lens, and a magnetic circuit including a coil, a magnet, and a magnetic yoke. Driving means for driving and displacing in the focusing direction and the tracking direction, an elastic support member for elastically supporting the lens holder in a cantilever manner, a fixed portion substrate for supporting the other end portion of the elastic support member, and a fixed portion for fixing the fixed portion substrate With a section holder,
Of the fixed part substrate, a portion that supports the end of the elastic support member is provided so as to be in non-contact with the fixed part holder, providing a gap between the fixed part substrate and the fixed part holder, At least a part of the void portion is cured by flowing an ultraviolet-curable resin or an infrared-curable resin or a thermosetting resin, and in the void portion, the opposed fixed portion substrate and the fixed portion holder are connected by the resin. Be composed. Further, the lens holder is supported by the four elastic support members, and among the four fixing points of the elastic support member on the fixed part substrate, the lens holder is located at substantially the same position in the tracking direction and at a different position in the focusing direction. A notch having an opening in the outer peripheral portion of the fixed part substrate is provided in the fixed part substrate between the two fixing points. Further, a projection for regulating the amount of the ultraviolet curable resin, the infrared curable resin, or the thermosetting resin entering the gap portion is provided on the fixed part substrate or the fixed part holder. Further, a viscoelastic material receiving portion for arranging the viscoelastic material on the fixing portion holder is provided. Further, a disk device equipped with the objective lens driving device having the above configuration may be used.

[0016]

Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 2 shows an optical disc (C) using the objective lens driving device according to one embodiment of the present invention.
1 is an external perspective view showing a (D-ROM) device.

The optical disk device 30 includes a disk tray 3
Optical disk (hereinafter, referred to as disk) 3 placed on 3
1 is sent into (or out of) the apparatus by a disk loading mechanism (not shown).
Further, the disc 31 sent into the apparatus is mounted on a turntable 32 integrally formed with a rotation shaft of a spindle motor, and is suction-fixed by a clamper 34 attached to a clamper holder 35.

The disk 31 is rotated at a predetermined number of revolutions by the spindle motor, and the information recorded on the disk 31 is read by the optical head 39 mounted on the unit mechanical chassis 36. An optical head 39 mounted on a feed base (rough moving means) (not shown) capable of coarsely moving the disk 31 in the radial direction has the objective lens driving device 1 according to the embodiment of the present invention mounted thereon.

The unit mechanical chassis 36 is attached to a mechanical base 37 via vibration isolating legs 38 made of an elastic member. A bottom cover 41 and a top cover 42 are attached to the entire apparatus.

FIG. 1 is an external perspective view showing an objective lens driving device according to one embodiment of the present invention. The objective lens driving device 1 is mounted on a feed base (rough moving means) (not shown) that is parallel to the information surface of an optical information recording medium such as an optical disk and is movable in the radial direction (tracking direction). . Further, an optical device (not shown) is arranged in the optical head.

The objective lens 2 and the lens holder 3
A focusing coil 4, a tracking coil 5,
The small substrate 6 is assembled. On the other hand, the base yoke 7
Has a focusing coil 4 and a tracking coil 5
The two magnets 8 and the upper yoke (not shown) respectively corresponding to the above are assembled to form a magnetic circuit of the present driving device.

The lens holder 3 is cantilevered by four elastic supporting members 12 joined to the small substrate 6, so that the lens holder 3 maintains its posture in the focusing direction and the tracking direction. It is possible to move. The base yoke 7 has a pin 1
1, the fixed part holder 9 to which the fixed part substrate 10 is mounted is assembled, and the other end of the elastic support member 12 is joined to the fixed part substrate 10.

The viscoelastic material receiving port 15 provided in the fixed part holder 9 covers a part of the elastic supporting member 12 so as to cover the elastic supporting member 12.
A viscoelastic material 13 having a function of damping vibration is filled, and plays a role of reducing unnecessary vibration of the elastic support member 12.

A gap 19 is provided between the fixed portion holder 10 and the connecting portion of the elastic support member 12 of the fixed portion substrate 10 so that the two portions 9 and 10 do not directly contact each other. An ultraviolet curable resin 14 functioning as a viscoelastic material having a function of attenuating vibration is also provided in a gap 19 between the unit substrate 10 and the fixed unit holder 9 so as to cover a part of the elastic support member 12. Have been. And
Accordingly, pitching and yawing, which are difficult to attenuate only with the viscoelastic material 13 provided in the viscoelastic material receiving port 15, are effectively attenuated.

In the present driving device, a current is supplied to the focusing coil 4 and the tracking coil 5 via the fixed portion substrate 10, the elastic support member 12, and the small substrate 6, so that the magnetic flux generated by the magnetic circuit is reduced. An electromagnetic force is generated between the objective lens 2 (lens holder 3)
Are driven in the focusing direction and the tracking direction.

Hereinafter, a method of assembling the objective lens driving device according to the present embodiment will be described with reference to FIGS.

As shown in FIG. 3, the tracking coils 5 and 5 are bonded to the focusing coil 4, and then the integrated coil is bonded inside the lens holder 3. Further, the small substrate 6 is bonded to the outside of the lens holder 3, and the ends of the focusing coil 4 and the tracking coil 5 are soldered to the small substrate 6. The small substrate 6 is provided with a through hole 6a for passing the elastic support member 12, and has a structure for conducting the coil and the elastic support member.

On the other hand, as shown in FIG.
Is attached to the fixed part holder 9, and this is attached to the base yoke 7 using the pin 11. Further, magnets 8 are bonded to the base yoke 7. The surface 16 of the fixed part holder 9 facing the fixed part substrate 10 has a convex shape, and the center part of this surface 16 contacts the fixed part substrate 10, while the side part of the surface 16 The side is separated from the fixed part substrate 10 by a predetermined distance so that the fixed part substrate 10 is not in contact with the fixed part substrate 10.
Is formed. The fixed portion substrate 10 has four through holes 17a to 17
Although d is formed, the vicinity of the through holes 17a to 17d does not contact the fixed portion holder 9 due to the convex shape of the surface 16 of the fixed portion holder 9 described above.

Next, as shown in FIG. 5, the lens holder 3 is arranged at a predetermined position in the base yoke 7 by using a jig (not shown), and the elastic support member 12 is fixed to the small substrate 6 and fixed. After passing through the through holes of the circuit board 10, soldering is performed at each through hole portion. At this point, both ends of the elastic support member 12 are fixed, and the through holes 17 a to 17 d of the fixed part substrate 10 are fixed points of the elastic support member 12.

Next, as shown in FIG. 6, the viscoelastic material receiving port 15 provided in the fixed part holder 9 is filled with a viscoelastic material 13 having an action of damping vibration. Further, in the gap 19 between the fixed part holder 9 and the fixed part substrate 10,
After pouring in the ultraviolet curable resin 14 having an action of damping vibration, it is irradiated with ultraviolet light for a predetermined time to be cured. The ultraviolet-curable resin 14 is in a liquid (sol-like) state before irradiation with ultraviolet rays, and gelates by irradiation with ultraviolet rays (this is referred to as curing in the present invention) to become a viscoelastic material, thereby damping vibration. It has a function to make it work.

Instead of the ultraviolet curing resin 14, an infrared curing resin or a thermosetting resin having a function of damping vibration may be used. The ultraviolet curable resin 14
May be the same material as the viscoelastic material 13 or may be a different material.
Uses different materials.

Finally, by bonding the lens 2 to the lens holder 3, the objective lens driving device 1 shown in FIG. 1 is obtained.

FIG. 7 is a sectional view of a main part of the fixed part holder 9 and the fixed part substrate 10. As shown in the figure, the objective lens driving device of the present embodiment has a structure in which the portion of the fixed part substrate 10 that supports the end of the elastic support member 12 is not in contact with the fixed part holder 9. Have. The gap 1 between the fixed part holder 9 and the fixed part substrate 10
The ultraviolet curable resin 14 disposed in the space 9 causes the gap 19
, The fixed part holder 9 and the fixed part substrate 10
And are connected.

FIGS. 8 and 9 show the frequency characteristics when a current is applied to the focusing coil and the frequency characteristics when a current is applied to the tracking coil of the conventional objective lens driving device 50 shown in FIG. 18, respectively. It is shown. In the conventional objective lens driving device 50, the rolling can be effectively suppressed by the viscoelastic material 62 provided on the fixed portion holder 57, while the pitching 21 and the yawing 22 are sufficiently suppressed. Can not.

On the other hand, FIGS. 10 and 11 show the frequency characteristics when a current is applied to the focusing coil and the frequency when the current is applied to the tracking coil of the objective lens driving device 1 of this embodiment shown in FIG. The characteristics are shown respectively. As shown in the figure, the objective lens driving device 1 of the present embodiment has an excellent vibration damping effect against all vibrations of rolling, pitching and yawing.

In the objective lens driving device 1 of the present embodiment,
After assembling the fixed part holder 9 and the fixed part substrate 10 and soldering the elastic supporting member 12 to the fixed part substrate 10, the ultraviolet curable resin 14 is inserted into the gap 19 between the fixed part holder 9 and the fixed part substrate 10. Is poured and cured by irradiating ultraviolet rays, so that the ultraviolet curable resin 14 is disposed in the gap portion 19, so that the assembling work is very easy. In addition, the ultraviolet curable resin 14
Is substantially zero, so that the stress of the ultraviolet curable resin 14 does not adversely affect the fixing portion substrate 10 or the elastic supporting member 12.

As described above, the objective lens driving device 1 of the present embodiment can effectively suppress all of rolling, pitching and yawing with a simple structure. Also, assembly is very easy.

FIG. 12 is an external perspective view showing an objective lens driving device according to another embodiment of the present invention. The configuration of the objective lens driving device 101 of the present embodiment is almost the same as that of the objective lens driving device 1 of the first embodiment shown in FIG. 1, and the lens holder 3 includes the objective lens 2, the focusing coil 4, , Tracking coil 5 and small substrate 6
The base yoke 7 is assembled with two magnets 8 and an upper yoke 18.

The lens holder 3 is cantilevered by four elastic support members 12 joined to the small substrate 6. The fixed yoke 7 is provided with a fixed part holder 9 to which a fixed part substrate 24 is mounted by means of pins 11, and the other end of the elastic support member 12 is joined to the fixed part substrate 24.

A viscoelastic material (not shown) is provided in a viscoelastic material receiving port provided in the fixed part holder 9. Also,
In the gap 19 between the fixed part substrate 24 and the fixed part holder 9, an ultraviolet curable resin 14 having a function of damping vibration is provided.
Are arranged. However, instead of the ultraviolet curable resin 14, an infrared curable resin having a function of damping vibration,
Alternatively, a thermosetting resin may be used.

In the objective lens driving device according to the present invention, an ultraviolet curable resin (or an infrared curable resin or a thermosetting resin) functioning as a viscoelastic material is provided in the gap between the fixed part holder and the fixed part substrate. When a force in the direction of the elongation of the elastic support member is applied from the support member to the fixed part substrate, the fixed part substrate is deformed (vibrated), whereas the viscoelastic material (ultraviolet curable resin) disposed in the gap is used. It works to suppress vibration. Therefore, if the rigidity of the elastic support member of the fixed part substrate in the direction of the extending material is too high, the damping effect is reduced.

Therefore, in the objective lens driving device 101 of the present embodiment shown in FIG. 12, by using the fixed portion substrate 24 having the notch 25 as shown in FIG.
The rigidity of the elastic support member 11 of the fixed part substrate 24 in the extending direction is reduced, and the vibration damping property against pitching and yawing is improved.

In the fixed part board 24 shown in FIG. 13, of the four fixed points 17a to 17d of the elastic support member 12, two fixed points 17a which are substantially at the same position in the tracking direction and different at different positions in the focusing direction. 1
7b, and the fixed part substrate 24 between 17c and 17d.
Are provided with cutouts 25 each having an opening on the side surface of each.

FIG. 14 shows the results of measuring the pitching amplitude and phase of the conventional objective lens driving device 50 shown in FIG. 18 and the objective lens driving device 101 of this embodiment shown in FIG. FIG. 15 shows the results of measuring the yaw amplitude and phase of the conventional objective lens driving device 50 shown in FIG. 18 and the objective lens driving device 101 of this embodiment shown in FIG. FIG.
4. In FIG. 15, the solid line indicates the measurement result of the present embodiment,
The broken line shows the result of the conventional measurement.

As shown in FIGS. 14 and 15, while the conventional objective lens driving device 50 has large pitching and yawing, the objective lens driving device 101 of the present embodiment significantly reduces pitching and yawing. Can be reduced.

Also in the objective lens driving device 101 of the present embodiment, the fixed part holder 9 and the fixed part substrate 24 are assembled,
Further, after the elastic support member 12 is soldered to the fixed part substrate 24, the ultraviolet curable resin 14 is poured into the gap 19 between the fixed part holder 9 and the fixed part substrate 24, and is cured by irradiating ultraviolet rays. Since the ultraviolet curable resin 14 is provided in the gap 19, the assembling work is very easy. In addition, the ultraviolet curable resin 14
Is substantially zero, so that the stress of the ultraviolet curable resin 14 does not adversely affect the fixing portion substrate 24 or the elastic support member 12.

As described above, the objective lens driving device 101 of the present embodiment has a simple structure, can effectively suppress vibration, and is very easy to assemble.

In the objective lens driving device according to the present embodiment described above, as shown in FIG. 16, the projection for regulating the amount of the ultraviolet curing resin entering the gap between the fixed part substrate and the fixed part holder. A fixed part holder 26 provided with 27 may be used. In this case, as shown in FIG.
Since the amount of 4 is regulated, the amount of the ultraviolet curable resin 14 in each section becomes uniform, and the vibration characteristics of the objective lens driving device are stabilized.

In any case, the objective lens driving device described above has a so-called moving coil type configuration in which a coil is disposed on the lens holder and a magnet is disposed on the yoke on the fixed portion side. However, it goes without saying that the present invention is also applicable to an objective lens driving device having a so-called moving magnet type configuration in which a magnet is provided in a lens holder. Also,
A disk device using the objective lens driving device of the present invention
The present invention is not limited to an optical disk device such as a CD-ROM, a DVD-ROM, and a DVD-RAM, but is also applied to a magneto-optical disk device.

[0050]

As described above, in the objective lens driving device of the present invention, the ultraviolet curing resin, the infrared curing resin, or the thermosetting resin is disposed in the gap between the fixed substrate and the fixed holder. With a simple structure, all the vibrations of rolling, pitching and yawing can be effectively suppressed. Further, since the work of disposing the resin in the gap can be performed after the completion of the assembling work of the fixed part substrate, the fixed part holder, the elastic support member, and the like, the assembly is very easy. Further, by mounting the objective lens driving device of the present invention, a disk device having good focusing servo and tracking servo characteristics can be obtained.

[Brief description of the drawings]

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

FIG. 2 is a schematic perspective view showing a configuration of a disk device equipped with an objective lens driving device according to one embodiment of the present invention.

FIG. 3 is an explanatory diagram showing a method of assembling the objective lens driving device according to one embodiment of the present invention.

FIG. 4 is an explanatory diagram showing a method of assembling the objective lens driving device according to one embodiment of the present invention.

FIG. 5 is an explanatory diagram showing a method of assembling the objective lens driving device according to one embodiment of the present invention.

FIG. 6 is an explanatory diagram showing an assembling method of the objective lens driving device according to one embodiment of the present invention.

FIG. 7 is an enlarged cross-sectional view of a part of a fixed part substrate and a fixed part holder in the objective lens driving device according to one embodiment of the present invention.

FIG. 8 is a diagram illustrating frequency characteristics of a conventional objective lens driving device.

FIG. 9 is a diagram illustrating frequency characteristics of a conventional objective lens driving device.

FIG. 10 is a diagram illustrating frequency characteristics of the objective lens driving device according to the embodiment of the present invention.

FIG. 11 is a diagram illustrating frequency characteristics of the objective lens driving device according to the embodiment of the present invention.

FIG. 12 is a schematic perspective view showing a configuration of an objective lens driving device according to another embodiment of the present invention.

FIG. 13 is a schematic perspective view of a fixed part substrate used in an objective lens driving device according to another embodiment of the present invention.

FIG. 14 is a graph showing pitching amplitude and phase of an objective lens driving device according to another embodiment of the present invention.

FIG. 15 is a graph showing yaw amplitude and phase of an objective lens driving device according to another embodiment of the present invention.

FIG. 16 is a schematic perspective view of a modified example of a fixed part holder used in an objective lens driving device according to another embodiment of the present invention.

FIG. 17 is an enlarged sectional view of a part of the fixing part holder of FIG. 16 and a fixing part substrate assembled thereto.

FIG. 18 is a perspective view of a conventional objective lens driving device.

FIG. 19 is an explanatory diagram of the principle of occurrence of rolling.

FIG. 20 is an explanatory diagram of the principle of occurrence of pitching.

FIG. 21 is an explanatory diagram of the principle of yawing.

FIG. 22 is a schematic view showing a partial cross section of a conventional objective lens driving device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Objective lens drive device 2 Objective lens 3 Lens holder 4 Focusing coil 5 Tracking coil 6 Small substrate 7 Base yoke 8 Magnet 9 Fixed part holder 10 Fixed part substrate 11 Pin 12 Elastic support member 13 Viscoelastic material 14 Ultraviolet curing resin (viscosity) Elastic material) 15 Viscoelastic material port 18 Upper yoke 19 Void 24 Fixed part substrate 26 Fixed part holder 30 Optical disk drive 31 Optical disk 32 Turntable 33 Disk tray 34 Clamper 35 Clamper holder 36 Unit mechanical chassis 37 Mechanical base 38 Anti-vibration leg 39 Light Head 41 Bottom cover 42 Top cover 101 Objective lens driving device

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Shinya Fujimori 292 Yoshida-cho, Totsuka-ku, Yokohama-shi, Kanagawa Prefecture Within the Multimedia System Development Division of Hitachi, Ltd. Address Machinery Research Laboratories, Hitachi Ltd. (72) Inventor Michio Miura 292 Yoshidacho, Totsuka-ku, Yokohama-shi, Kanagawa Prefecture, Ltd.Video and Media Division, Hitachi, Ltd. 292 Yoshidacho Inside Hitachi Image Information System Co., Ltd.

Claims (6)

[Claims] 1. A lens holder for holding an objective lens, a driving unit for driving and displacing the objective lens in a focusing direction and a tracking direction by a magnetic circuit including a coil, a magnet, and a magnetic yoke; An elastic support member for cantilever support,
A fixed portion substrate that supports the other end portion of the elastic support member, and a fixed portion holder that fixes the fixed portion substrate, a portion of the fixed portion substrate that supports an end portion of the elastic support member, A gap is provided between the fixed part substrate and the fixed part holder so as not to be in contact with the fixed part holder, and at least a part of the gap is made of an ultraviolet curable resin or an infrared curable resin or a thermosetting resin. An objective lens driving device, wherein a resin flows in and is hardened, and the opposed fixed portion substrate and the fixed portion holder are connected by the resin in the gap. 2. The lens holder according to claim 1, wherein the lens holder is supported by the four elastic support members, and among the four fixing points of the elastic support member on the fixed portion substrate, the lens holders are substantially at the same position in the tracking direction. An objective lens driving device, wherein a notch having an opening in an outer peripheral portion of the fixed part substrate is provided in the fixed part substrate between two fixed points located at different positions in the focusing direction. . 3. The fixing unit substrate or the fixing unit holder according to claim 1, wherein an amount of the ultraviolet curable resin, the infrared curable resin, or the thermosetting resin entering the gap is regulated. An objective lens driving device comprising a projection. 4. The objective lens driving device according to claim 1, further comprising a viscoelastic material receiving portion for arranging a viscoelastic material on the fixing portion holder. 5. A disk device for recording and / or reproducing information on an information recording disk, comprising: a motor for rotating the disk at a predetermined rotation speed; and an optical head for recording and / or reproducing information. The optical head is mounted on coarse moving means capable of coarsely moving in the radial direction of the disk, and the optical head comprises a lens holder for holding an objective lens, a coil, a magnet, and a magnetic yoke. Driving means for driving and displacing the objective lens in the focusing direction and the tracking direction by a magnetic circuit; an elastic support member for elastically supporting the lens holder in a cantilever manner; and a fixing portion for supporting the other end of the elastic support member. A substrate, and a fixing part holder for fixing the fixed part substrate, a part of the fixed part substrate supporting an end of the elastic support member However, so as to be non-contact with the fixed part holder, a gap is provided between the fixed part substrate and the fixed part holder, and at least a part of the gap part is an ultraviolet curable resin or an infrared curable resin or A disk device comprising an objective lens driving device in which a thermosetting resin flows therein and is cured, and in the gap, the opposed fixed portion substrate and the fixed portion holder are connected by the resin. . 6. A disk device according to claim 5, wherein the objective lens driving device according to claim 2, 3, or 4 is mounted.