JP2003346364A - Optical head apparatus and optical reproduction apparatus using it - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To make a low-profile movable part with securing the rigidity of the movable part of the objective lens driving apparatus of an optical head apparatus. <P>SOLUTION: The movable part 100 has a lens holder 20 that is made of resin and attached with an objective lens 10, a plate-shaped coil unit 60, and a metal substrate holder 90. The substrate holder 90, the coil unit 60 and the lens holder 20 are unified through a plurality of projections 91 of the substrate holder 90. The coil unit 60 has the focus coil 61 and a pair of the tracking coils 62. On only one side of the coil unit 60, a magnet 50 that is dipolarized in a concave-convex shaped is placed. Each of the coils 61 and 62 is placed so that a particular edge of each of the coils 61 and 62 intersects a magnetic flux from the N pole to the S pole of the magnet 50. <P>COPYRIGHT: (C)2004,JPO

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical head device of an optical disk device capable of optically reading and writing information by projecting a light spot on an information recording surface of an optical disk (optical recording medium), and an optical reproducing device using the same. .

[0002]

2. Description of the Related Art In general, an optical head device of an optical disk device comprises an objective lens driving device having an objective lens and an optical system for transmitting and receiving light via the objective lens. It has a structure in which an objective lens driving device is arranged.

[0003] The objective lens driving device is roughly divided into a movable portion having an objective lens, a focus coil and a tracking coil, and a fixed portion having a magnetic circuit.
The movable part is supported by the fixed part by a plurality of elastic support members. The elastic support member is at least partially surrounded by a damper material.

[0004] In such an objective lens driving device, there is a problem to prevent resonance caused by a mismatch between the center of gravity and the driving point. Japanese Patent Application Laid-Open No. Hei 8-263861 discloses that a focus coil and a tracking coil are formed in a flat plate shape, and are arranged in plane symmetry with respect to a center plane in a thickness direction, respectively. And an optical head device using the objective lens driving device.

FIG. 9 is a plan view schematically showing a conventional objective lens driving device described in the above publication. FIG.
0 is an exploded perspective view of a movable portion of the conventional objective lens driving device,
FIG. 11 is a side view schematically showing a movable portion of a conventional objective lens driving device. The conventional objective lens driving device shown in FIG. 9 has a movable portion composed of a bobbin 122 having an objective lens 121 held at one end and an opening 123 formed in the center. A plurality of elastic support members 135 are provided to movably support the movable portion in a direction parallel to the optical axis of the objective lens 121 and in a plane direction perpendicular to the optical axis. The coil mounting plate 128 is a flat focusing coil 1
31 and 131 and the tracking coils 134 and 134 are laminated and bonded in a plane-symmetric manner, respectively, and are arranged such that the plane is parallel to the optical axis of the objective lens 121. The pair of magnets 147 and 148 are provided with focusing coils 131 and 13 disposed on the coil mounting plate 128.
1 and the tracking coils 134, 134 to constitute a magnetic circuit section for driving and displacing the movable section. The magnets 147 and 148 are respectively connected to rising pieces 145 and 146 forming a yoke.

[0006]

In the objective lens driving device described in the above publication, the focusing coil 13 is used.
1 and 131 and the tracking coils 134 and 134 are formed in a flat plate shape, and one coil unit (coil mounting plate 128) formed by laminating them in plane symmetry with respect to the center plane in the thickness direction is a lens holder (bobbin 122). ).

As shown in FIGS. 10 and 11, a notch (coil mounting plate insertion groove) 127 for mounting a coil mounting plate 128 is provided in the bobbin 122, and the coil mounting plate 128 is mounted in the coil mounting plate insertion groove 127. It is positioned and fixed with an adhesive or the like.

However, in this structure, there is a problem that the rigidity of the bobbin 122 is reduced by the coil mounting plate insertion groove 127. Since a decrease in the rigidity of the bobbin 122 leads to a decrease in the rigidity of the movable portion, there arises a problem that the higher-order resonance frequency of the movable portion cannot be increased.

In order to avoid the above problem and secure the rigidity, it is conceivable to increase the thickness of the connecting portion of the coil mounting plate 128 with the bobbin 122 (portion indicated by T in FIG. 11). There is a problem that it becomes difficult to reduce the thickness of the device. In any case, in the structure in which the coil mounting plate 128 is inserted and fixed in the coil mounting plate insertion groove 127 formed in the bobbin 122, the dimension of the movable portion in the height direction is considerably larger than the height of the coil mounting plate 128. I have to grow.

In order to meet the demand for smaller and thinner information electronic equipment, the movable part is made thinner while securing the rigidity of the movable part, and the optical head device and the optical reproducing device (optical disk drive device) are made smaller. -It is necessary to reduce the thickness.

The present invention has been made to solve such problems, and an optical head device capable of reducing the thickness of a movable portion while securing rigidity of the movable portion, an optical reproducing device using the same, and an optical reproducing device using the same. It is an object of the present invention to provide an optical reproducing device that has been used.

[0012]

An object of the present invention is to provide a lens holder having an objective lens mounted thereon, a drive coil held by the lens holder for driving the objective lens, and integrated with the lens holder via the drive coil. The present invention is achieved by an optical head device comprising: a substrate holder to be formed; an opening formed in the substrate holder; and a magnet disposed in the opening and facing the drive coil.

In the above-mentioned optical head device according to the present invention, the lens holder and the substrate holder are made of different materials.

In the optical head device according to the present invention, the substrate holder is formed of a material having higher rigidity than the lens holder.

In the optical head device according to the present invention, the lens holder is formed of a resin material, and the substrate holder is formed of a metal material.

In the optical head device according to the present invention, a thickness of the drive coil or a coil unit including the drive coil in a focus direction is greater than a thickness of the substrate holder.

In the optical head device according to the present invention, a thickness of the drive coil or a coil unit including the drive coil in a focus direction is equal to or greater than a thickness of the lens holder.

[0018]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An optical head device and an optical reproducing apparatus using the same according to one embodiment of the present invention will be described with reference to FIGS. FIG. 1 is an exploded perspective view showing a configuration of an objective lens driving device of an optical head device according to the present embodiment, FIG. 2 is a side view of a movable portion of the objective lens driving device, and FIG.
FIG. 4 is a diagram illustrating magnetization of a magnet and arrangement of a focus coil and a tracking coil. FIG. 4 is an exploded perspective view illustrating a configuration of a movable portion of another objective lens driving device according to the present embodiment.
FIG. 5 is a plan view of the objective lens driving device of the optical head device according to the present embodiment.

As shown in FIG. 1, an information recording surface of an optical disk (optical recording medium), not shown, is converged, and a light beam is focused and irradiated on the information recording surface of the optical disk to record or reproduce information. The objective lens 10 is held by a lens holder 20. The lens holder 20 is formed of a resin material. As the resin material, a liquid crystal polymer can be used. Various engineering plastics can be used as the resin material if desired moldability and rigidity can be obtained.

The coil unit 60 is formed by laminating four layers of a substantially rectangular flat substrate on which a focus coil 61 and a tracking coil 62 formed by patterning a conductor are formed. Rectangular 4 of coil unit 60
Four through holes 64 are provided near the two corners for positioning during assembly. In addition, the coil unit 60
The above-mentioned focus coil 61 and tracking coil 6
Instead of the four-layer laminated structure of the flat substrate on which the two are formed, for example, a four-layer laminated structure in which a tracking coil is formed 62 in two central layers and a focus coil 61 is formed in two outer layers may be used. it can.

The substrate holder 90 is formed of a metal material having a U-shaped cross section substantially perpendicular to the optical axis of the objective lens 10. Stainless steel can be used as the metal material. A material that is nonmagnetic, lightweight, and has high rigidity can be used as the metal material. Four protrusions 91 for positioning are formed on the substrate holder 90 corresponding to the four through holes 64 of the coil unit 60. The coil unit 60 is positioned and held with respect to the substrate holder 90 by allowing each projection 91 to pass through each through hole 64. The lens holder 20 has four holes (not shown) into which four projections 91 of the substrate holder 90 are inserted, on an unillustrated facing surface facing the coil unit 60.
With the projections 91 holding the coil unit 60, the projections 91 are inserted into the four holes of the lens holder 20, respectively.
The coil unit 60 is positioned with respect to the lens holder 20. As a result, the lens holder 20, the coil unit 60, and the substrate holder 90 are integrated to form the movable unit 100 including the objective lens 10. As shown in FIGS. 1 and 2, the movable unit 100 according to the present embodiment includes:
The lens holder 20 provided with the objective lens 10 is positioned on one side of the coil forming surface of the coil unit 60 as a boundary, and an opening is formed only on the other side.

As shown in FIG. 1, a coil unit 60 includes a focus coil 61 and a tracking coil 62.
There are formed four lands (not shown) serving as lead portions for supplying a current to the device. In the vicinity of the land, four V-shaped grooves 63 for positioning the four conductive elastic bodies 70 are formed.
3 and fixed by soldering. Conductive elastic body 70
Is fixed to the base substrate 80 by soldering. As a result, the movable part 100 is
0, a wire base 40, a magnet 50, and a cantilevered support movably with respect to a fixed portion including the base substrate 80.

The coil unit 60 includes the yoke base 30
Are arranged in a magnetic circuit formed by a magnet 50 adhered to a yoke 31 formed on one end of the magnet. The magnet 50 is arranged so as to protrude from one end of the yoke base 30. The coil forming surface of the coil unit 60 is arranged so as to face one magnetized surface of the magnet 50. The substantially rectangular parallelepiped magnet 50 is two-pole magnetized in a concave region and a convex region combined with the concave region, as indicated by a virtual line 51 representing a magnetic boundary. In this example, the concave area is S
The pole is magnetized and the convex region is magnetized to the N pole. In addition, 2
Polar magnetization may be realized by combining two magnetized magnets in addition to the method of magnetizing one magnet to two poles as described above.

As described above, since the magnet 50 is arranged so as to protrude from one end of the yoke base 30, FIG.
As shown in the figure, by making the thickness of the coil unit 60 in the focus direction more than the thickness of the substrate holder 90 and making the substrate holder 90 relatively thin, the drive coil can be enlarged while securing the drive stroke in the focus direction. The driving force in the focusing direction and the tracking direction can be increased. Further, by making the thickness of the lens holder 20 in the focus direction equal to or less than the thickness of the coil unit 60, the size and weight of the lens holder 20 can be relatively reduced.

FIG. 3 shows the arrangement relationship between the magnetized area of the magnet 50 and the focus coil 61 and the tracking coils 62a and 62b when viewed from the coil forming surface of the coil unit 60 to the magnetized surface of the magnet 50. . As shown in FIG. 3, the focus coil 61 is wound in a rectangular shape. Two tracking coils 62
Reference numerals a and 62b are arranged on the inner substrate surface of the focus coil 61. The tracking coils 62a and 62b are also respectively wound in a rectangular shape.

In these drive coils, one side faces only one magnetized area facing the magnet, and the other side facing the one side faces only another magnetized area. Here, for convenience, if the four sides of the rectangular shape of the focus coil 61 are divided into areas A, B, C, and D as shown in FIG. 3, the side B of the focus coil 61 faces the N pole of the magnet 50. And the side D opposing the side B is disposed at a position facing the S pole. The sides A and C of the focus coil 61 are arranged at positions not facing the magnet 50.

When the four sides of the rectangular shape of the tracking coils 62a and 62b are divided into areas A, B, C and D as shown in FIG. 3 similarly to the focus coil 61, the side A of the tracking coil 62a is The magnet 50 is arranged at a position facing the N pole, and the C side facing the A side is arranged at a position facing the S pole. The sides B and D of the tracking coil 62a are magnet 5
It is arranged at a position straddling the N pole and S pole of zero.

On the other hand, the side A of the tracking coil 62b is arranged at a position facing the S pole of the magnet 50, and the side C facing the side A is arranged at a position facing the N pole. Further, the sides B and D of the tracking coil 62b are arranged at positions straddling the N pole and the S pole of the magnet 50.

Each of the tracking coils 62a, 62
b is wound so that the direction of the current flowing through the side A of one tracking coil 62a is opposite to the direction of the current flowing through the side A of the other tracking coil 62b. In the present embodiment, these drive coils 61 and 62 are wound in a rectangular shape, but may be wound in a circular, elliptical or polygonal shape.
Of course, a part of the magnet 2 may be configured to face only one magnetized region of the facing surface of the magnet 50, and another portion facing the portion may be configured to face only the other magnetized region.

The coil forming surface of the optical head device having the objective lens driving device having such a configuration is disposed so as to be parallel to the radial direction of the optical disk, and the coil unit 6 is provided.
Focus coil 61 and tracking coil 6 within 0
2 (62a, 62b), a driving force is generated on the sides B and D of the focus coil 61 in the focus direction (vertical direction in FIG. 3) based on Fleming's left hand rule, and the tracking coil 62a , 62b side A,
A driving force that moves in the tracking direction (the left-right direction in FIG. 3) is generated on side C. As a result, the runout of the optical disc,
The objective lens 10 can be moved in each direction according to the eccentricity. For example, the focus position is adjusted by moving the objective lens 10 in a direction substantially perpendicular to the information recording surface of the optical disk by using the focus coil 61, and the objective lens 10 is moved in the radial direction of the optical disk by using the tracking coils 62a and 62b. Can be adjusted.

As described above, in the optical head device according to the present embodiment, the movable portion 100 of the objective lens driving device is separated from the lens holder 2 by the plate-shaped coil unit 60 as a boundary.
0 and the substrate holder 90 are characterized.

The movable part 100 of the objective lens driving device is divided into a lens holder 20 on which the objective lens 10 is installed and a substrate holder 90 on which the objective lens 10 is not installed. By adopting a structure in which the coil unit 60 is attached, the movable unit 100
The thickness of the movable section 100 can be reduced while securing the rigidity of the movable section 100. Further, by improving the rigidity of the movable section 100, the higher-order resonance frequency can be increased.

The lens holder 20 and the substrate holder 90
Is formed of a different material, the rigidity of the movable part 100 can be secured while the weight of the movable part 100 is reduced. here,
The substrate holder 90 is desirably formed of a material having higher rigidity than the lens holder 20. For example, the lens holder 20
Is formed of a resin material, and the substrate holder 90 is formed of a metal material. As the metal material, a material that is lightweight, has high rigidity, and is a nonmagnetic material is used.

With the configuration according to the present embodiment, the conventional connection portion T itself shown in FIG. 11 can be eliminated, and the optical head device can be made thin. According to the present embodiment, it is possible to reduce the thickness of the movable part while securing the rigidity of the movable part in response to the demand for miniaturization and thickness reduction of the information electronic device. Can be realized.

FIG. 4 is an exploded perspective view showing a configuration of a movable portion of another objective lens driving device according to the present embodiment. FIG.
The focus coil 61 and the tracking coil 62 shown in FIG. The lens holder 20 is provided with a winding coil tie 65, and the focus coil 61 and the tracking coil 62 are provided from the winding coil tie 65 via a winding coil lead 66.
It is wired to. Each winding coil tying part 65 is solder 7
1 are connected to the four conductive elastic bodies 70, respectively. Note that a winding frame for the focus coil 61 and each tracking coil 62 may be provided on the side surface of the lens holder 20, and the winding may be wound around each winding frame to form the focus coil 61 and the tracking coil 62. . Further, the focus coil 61 and the tracking coil 62 without a bobbin (bobbin-less) may be respectively attached to the side surfaces of the lens holder 20 by bonding or the like. With this configuration, the same effect as described above can be obtained.

In FIG. 4A, the thickness of the focus coil 61 in the focus direction is substantially the same as that of the substrate holder 90. However, the magnet 50 is arranged to protrude from one end of the yoke base 30 as described above. Therefore, as shown in FIG. 4B, the thickness of the focus coil 61 may be made larger than the thickness of the substrate holder 90 to make the thickness of the substrate holder 90 relatively thinner.
This makes it possible to increase the size of the drive coil while ensuring the drive stroke in the focus direction, and to increase the drive force in the focus direction and the tracking direction. Also, the lens holder 20 in the focus direction
Is smaller than the thickness of the focus coil 61, the lens holder 20 can be relatively reduced in size and weight.

The optical head device according to the present embodiment has the structure shown in FIG.
Unlike the conventional configuration in which magnets are arranged on both sides of a coil for generating a driving force as shown in FIG.
As shown in FIG. 3, the magnet 50 is arranged only on one side of the coil unit 60, and as shown in FIG.
No. 0 coil-facing surface is magnetized in two poles in an uneven shape, and an objective lens drive in which specific sides of each of the coils 61 and 62 intersect magnetic flux from the N pole to the S pole of the magnet magnetized in two poles Since the apparatus is used, the driving force in the focus direction and the tracking direction can be generated by only one magnet. Since only one magnet is required, the objective lens 10 can be arranged on one side of the coil unit 60 for generating the driving force.

As described above, the optical head device according to the present embodiment has a structure in which an opening is not provided on the side on which the objective lens 10 is disposed. There is no need to reduce the thickness. For this reason,
The rigidity of the objective lens installation part is increased and the movable part 10
The rigidity of the entirety can be increased, and the higher-order resonance frequency can be set higher. Further, since the distance between the coils 61 and 62 for generating a driving force and the objective lens 10 can be shortened and the entire movable section 100 can be reduced in size, the size of the optical head device can be shortened in the tangential direction of the optical disk to reduce Can be reduced in size. Also, since only one magnet 50 is used, the optical head device can be manufactured at low cost.

FIG. 6 shows an optical head device 1 according to the present embodiment.
1 shows a schematic configuration of an optical reproducing device 150 on which the optical disc 10 is mounted. The optical reproducing device 150 includes a spindle motor 152 for rotating the optical recording medium 160 as shown in FIG.
An optical head device 110 that irradiates the optical recording medium 160 with a laser beam and receives the reflected light thereof, a controller 154 that controls the operations of the spindle motor 152 and the optical head device 110, and supplies a laser drive signal to the optical head device 110. Drive circuit 155 for performing the operation and the lens drive circuit 1 for supplying the lens drive signal to the optical head device 110
56.

The controller 154 includes a focus servo tracking circuit 157, a tracking servo tracking circuit 158, and a laser control circuit 159. When the focus servo following circuit 157 is activated, the recording surface of the rotating optical recording medium 160 is in focus, and when the tracking servo following circuit 158 is activated, the eccentric signal of the optical recording medium 160 is output. The laser beam spot automatically follows the track. The focus servo tracking circuit 157 and the tracking servo tracking circuit 158 are provided with an auto gain control function for automatically adjusting the focus gain and an auto gain control function for automatically adjusting the tracking gain. The laser control circuit 159 is a circuit that generates a laser drive signal supplied by the laser drive circuit 155, and generates an appropriate laser drive signal based on the recording condition setting information recorded on the optical recording medium 160. I do.

These focus servo follow-up circuits 157,
The tracking servo following circuit 158 and the laser control circuit 159 need not be circuits incorporated in the controller 154,
And may be separate components. Further, these need not be physical circuits, but may be software executed in the controller 154. The optical reproducing apparatus 150 may be included in an optical recording / reproducing apparatus having a recording function, or may be a reproduction-only apparatus without a recording function.

FIG. 7 is an exploded perspective view showing the structure of an objective lens driving device of another optical head device according to the present embodiment, and FIG.
8 is a side view of a movable portion of the objective lens driving device shown in FIG. The objective lens driving device shown in FIGS. 7 and 8 has a configuration in which magnets are arranged on both sides of a coil for generating a driving force.

As shown in FIG. 7, the optical recording medium faces an information recording surface of an optical recording medium (not shown), and focuses a light beam and irradiates the information recording surface of the optical recording medium to record or reproduce information. The objective lens 210 is held by the lens holder 220. The lens holder 220 holds the objective lens 210
Is formed of a U-shaped resin material having a cross section substantially orthogonal to the optical axis of the optical disk. As the resin material, a liquid crystal polymer can be used. Various engineering plastics can be used as the resin material if desired moldability and rigidity can be obtained.

The coil unit 260 is formed by laminating four layers of a substantially rectangular planar substrate on which a focus coil 261 and a tracking coil 262 formed by patterning a conductor are formed. Four through holes 264 are provided near the four corners of the rectangular shape of the coil unit 260 for positioning during assembly. Note that the coil unit 260 has, for example, a tracking coil formation 262 formed at the center two layers, and a two-layer outer tracking layer formed on the outer two layers instead of the four-layer laminated structure of the flat substrate on which the focus coil 261 and the tracking coil 262 are formed. Focus coil 2
It is also possible to adopt a four-layer laminated structure in which 61 is formed.

The substrate holder 290 is formed of a metal material having a U-shaped cross section substantially perpendicular to the optical axis of the objective lens 210. Stainless steel can be used as the metal material. A material that is nonmagnetic, lightweight, and has high rigidity can be used as the metal material. Substrate holder 29
0 has four protrusions 291 for positioning corresponding to the four through holes 264 of the coil unit 260. The coil unit 260 is positioned and held with respect to the substrate holder 290 by allowing each protrusion 291 to pass through each through hole 264. The lens holder 220 has four holes (not shown) into which four protrusions 291 of the substrate holder 290 are inserted, on a surface (not shown) facing the coil unit 260. With the projections 291 holding the coil unit 260, the projections 291 are inserted into the four holes of the lens holder 220, respectively.
60 is positioned with respect to lens holder 220. Thereby, the lens holder 220 and the coil unit 2
The movable part 200 including the objective lens 210 is configured by integrating the substrate 60 and the substrate holder 290. 7 and 8
As shown in FIG. 7, the movable section 200 according to the present modification has a structure in which openings are formed on both sides of the coil forming surface of the coil unit 260 by the lens holder 220 and the substrate holder 290 having a U-shaped cross section. Has become.

As shown in FIG. 7, the coil unit 260
Are formed with four lands (not shown) serving as lead portions for supplying current to the focus coil 261 and the tracking coil 262. V-grooves 2 for positioning the four conductive elastic bodies 270 near the lands
63 are formed at four places, and four conductive elastic bodies 27 are formed.
Numeral 0 is fixed by soldering in a V groove 263. The other end of the conductive elastic body 270 is fixed to the base substrate 280 by soldering. Thereby, the movable part 200
Is movably supported in a cantilever manner with respect to a fixed portion including the yoke base 230, the wire base 240, the two magnets 250, 250, and the base substrate 280.

The coil unit 60 is disposed in a magnetic gap 251 formed by a pair of magnets 250, 250 bonded to a pair of yokes 231, 231 disposed on the yoke base 230 to face each other.

With such a configuration, the coil unit 260
Focus coil 261 and tracking coil 2
When a current is applied to the objective lens 62, a driving force is generated in each direction by the same operation as that of the objective lens driving device shown in FIGS. Can be moved to. According to the configuration of this modification, the same effects as those of the optical head device shown in FIGS. 1 to 5 can be obtained.

The present invention is not limited to the above embodiment, but can be variously modified. For example, in the above embodiment, the focus coil 61 and the tracking coils 62a, 62b
Although the description has been made using the coil unit 60 including the above, the present invention is not limited to this, and a configuration in which a tilt coil is provided in the coil unit 60 may be used. Further, the tilt coil may be attached to the lens holder 20 side.
Further, the present invention can be applied to an optical head device including a coil unit in which a focus coil and a tracking coil also serve as a tilt drive.

[0050]

As described above, according to the present invention, it is possible to realize an optical head device in which the coil unit can be easily mounted and the rigidity of the entire movable portion can be increased while being thin.

[Brief description of the drawings]

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

FIG. 2 is a side view of a movable portion of the objective lens driving device of the optical head device according to one embodiment of the present invention.

FIG. 3 is a diagram showing the magnetization of a magnet and the arrangement of a focus coil and a tracking coil in an optical head device according to an embodiment of the present invention.

FIG. 4 is an exploded perspective view showing a configuration of a movable portion of an objective lens driving device of another optical head device according to an embodiment of the present invention.

FIG. 5 is a plan view of the objective lens driving device according to one embodiment of the present invention.

FIG. 6 is a diagram showing a schematic configuration of an optical reproducing apparatus equipped with an optical head device according to an embodiment of the present invention.

FIG. 7 is an exploded perspective view of another optical head device according to one embodiment of the present invention.

FIG. 8 is a side view of a movable portion of another optical head device according to an embodiment of the present invention.

FIG. 9 is a plan view of a conventional objective lens driving device.

FIG. 10 is an exploded perspective view of a conventional objective lens driving device.

FIG. 11 is a side view of a conventional objective lens driving device.

[Explanation of symbols]

10,210 Objective lens 20,220 Lens holder 30,230 Yoke base 31,231 York 40,240 wire base 50,250 magnet 51 Magnetization boundary 60,260 coil unit 61,261 Focus coil 62,262 tracking coil 63,263 V groove 64,264 through hole 65 Winding coil 66 Winding coil lead 70,270 Conductive elastic body 80,280 Base substrate 90,290 substrate holder 91,290 protrusion 100,200 Moving parts 110 Optical Head Device 150 Optical regeneration device 152 spindle motor 154 controller 155 Laser drive circuit 156 Lens drive circuit 157 Focus servo tracking circuit 158 Tracking servo tracking circuit 159 Laser control circuit 160 Optical recording medium 251 Magnetic gap

   ────────────────────────────────────────────────── ─── Continuation of front page    F term (reference) 5D118 AA01 AA12 AA23 DC03 EA02                       EB11 EB17 EC08 EC10 ED01                       ED05 ED08 EF00 EF06 FA29                       FB20                 5D119 AA35 JA42 JC04 JC06                 5D789 AA35 JA42 JC04 JC06

Claims (7)

[Claims] A lens holder having an objective lens mounted thereon; a drive coil held by the lens holder to drive the objective lens; a substrate holder integrated with the lens holder via the drive coil; An optical head device comprising: an opening formed in a substrate holder; and a magnet disposed in the opening and facing the drive coil. 2. The optical head device according to claim 1, wherein said lens holder and said substrate holder are formed of different materials. 3. The optical head device according to claim 2, wherein the substrate holder is formed of a material having higher rigidity than the lens holder. 4. The optical head device according to claim 3, wherein said lens holder is formed of a resin material, and said substrate holder is formed of a metal material. 5. The optical head device according to claim 1, wherein a thickness of the drive coil or a coil unit including the drive coil in a focus direction is equal to or greater than a thickness of the substrate holder. An optical head device, characterized in that: 6. The optical head device according to claim 1, wherein a thickness of the drive coil or a coil unit including the drive coil in a focus direction is equal to or greater than a thickness of the lens holder. An optical head device, characterized in that: 7. An optical reproducing apparatus comprising the optical head device according to claim 1. Description: