JP2000030272A - Objective lens driving device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make an overall a device thinner by dividing a feeder supplying drive currents to drive coils into plural feeders, making divided feeders cross in a sliding direction and arranging them at outer peripheral positions of a lens holder, along the tangential directions of the rotation of the holder. SOLUTION: A feeder 10 is fixed to a feeder fixing part 4a of a yoke base 4 via a feeder fixing member 10a and is divided into two feeders at this position, and the feeders are made to cross in the direction of a focus axial direction, while respectively keeping the radius of curvature of not smaller than a fixed value and are draw around along two tangential directions forward and reverse with respect to the direction of rotation of a lens holder 2 to be installing fixed on the outer periphery of the holder. Fixing parts of this lens holder side are outer peripheral positions of the lens holder whose radius is larger than radii connecting its center and centers of lenses, that is the positions are on the outermost peripheral cylinder of the lens holder 2. Since attaching heights in the axial direction of a shaft are available with a fixed width at the same position as that of the lenses, an attaching margin for fixing the feeders is not needed at the part of the axial center. Thus, the thinning of the overall device, including the lens holder 2, is made possible.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical information recording / reproducing apparatus for recording / reproducing a plurality of optical information recording media having different substrate thicknesses. The present invention relates to an optical information recording / reproducing apparatus including an objective lens driving device that switches and uses an objective lens so as to form an appropriate light spot on a recording medium. More specifically, the present invention relates to a structure of power supply means for supplying a drive current or a voltage to a lens holder, which is a movable portion of an objective lens driving device.

[0002]

2. Description of the Related Art Conventionally, as an optical information recording / reproducing apparatus of this type, for example, an apparatus described in Japanese Patent Application Laid-Open No. Hei 9-161289 has been known. A conventional lens switching type objective lens driving device will be described with reference to FIGS. 5 (a) and 5 (b).

FIG. 5 (a) is a plan view of a conventional objective lens driving device having a lens switching mechanism, and FIG. 5 (b) is a perspective view of a movable section viewed from the back.

[0004] Reference numeral 22 denotes a lens holder having bearings, which are objective lenses 21a and 21b corresponding to disks having different substrate thicknesses, a focus coil 25, and a tracking coil 2.
6a to 26d and magnetic plates 29a to 29d are provided to constitute a mover. 23 is a shaft and a yoke base 24
, And holds the lens holder 22 so as to be rotatable and slidable. The tracking coils 26a to 26d and the magnetic plates 29a to 29d form a pair at opposing positions of a diameter line passing through the shaft 23, and are arranged in pairs.

The yoke base 24 has tracking magnets 28a, 28b and focus magnets 25a, 2b.
5b is arranged at a position facing the focus coil 25 and the tracking coils 26a to 26d of the mover to form an electromagnetic drive circuit. The magnetic attraction of the magnetic plates 29a to 29d and the tracking magnets 28a and 28b positions the mover in the rotation direction and the sliding direction.

A drive current is applied to the focus coil to drive the mover in the shaft axis sliding direction, that is, in the focus direction. Similarly, the tracking coils 26a to 26d
The driving current is applied to the movable element to drive the movable element in the shaft axis rotating direction, that is, in the tracking direction.

On the other hand, when a disc having a different substrate thickness is set, the disc is discriminated by disc discriminating means (not shown) such as a difference in amplitude of a focus error signal, and recording and reproduction are performed by switching to a desired objective lens. . The lens switching is performed by applying a pulse current having a short fixed time width to the tracking coils 26a and 26b and attracting and positioning the magnetic plates 29 to the tracking magnets 28a and 28b.
The operation is performed by rotating the mover to a position where a and 29b are switched to the magnetic plates 29c and 29d.

The feeder line 20 for supplying a drive current to the mover is divided into a plurality of parts, and the lens holder is fixed to the yoke base 2 to which the tracking magnets 28a and 28b are fixed.
4, the lens holder side is fixed to the root cylindrical portion of the focus coil 25, and is substantially symmetric so that the drawing portion has the same shape even when the mover rotates by switching the lens. I have. As the power supply line 20, for example, a flexible printed board is used.

[0009]

However, in this conventional configuration, the power supply line is mounted near the center of gravity across the lens mounting position of the lens holder from the yoke base side. Since it is necessary to secure a margin in the focus direction, it has been difficult to reduce the thickness of the entire apparatus.

Also, since the winding radius of the feeder line at the lens holder mounting portion is reduced, the rotational component due to the springiness of the feeder line is increased, and an unnecessary load is applied to the operating lens holder to affect the dynamic characteristics. Had.
In order to reduce this load, it is necessary to arrange a sufficiently long feeder line 20, and it has been difficult to reduce the size of the entire apparatus.

The present invention, in order to solve the above-mentioned conventional problems, provides an objective lens driving device which can be made thinner and has a feeder line configured so that the load on the mover is reduced and the dynamic characteristics are improved. The purpose is to do.

[0012]

In order to achieve this object, an objective lens driving device according to the first aspect of the present invention comprises: a lens holder having at least two objective lenses having different numerical apertures; A lens holder supporting means for switching the center of the objective lens to the optical axis position of the light beam, rotating and moving in the focus direction and the tracking direction, a fixing part for fixing the lens holder supporting means, and a lens holder And a power supply means for supplying power to the drive coil from the fixed portion, and the fixed position of the power supply means on the lens holder side is located on the outer peripheral side of the lens holder larger than the radius connecting the rotation center and the lens center. And is provided along the tangential direction of the rotational movement.

According to a second aspect of the present invention, there is provided an objective lens driving device, comprising: a lens holder on which at least two objective lenses having different numerical apertures are mounted; and a light beam having a predetermined rotation center and a center of the objective lens. A lens holder supporting means for switching and rotating to an axial position and movable in a focusing direction and a tracking direction, a fixing portion for fixing the lens holder supporting means, a driving coil mounted on the lens holder, and a deformation in the focusing direction An elastic support member fixed to a possible fixing portion, and power supply means for supplying power to the drive coil from the elastic support member, wherein a fixed position of the power supply means on the lens holder side is larger than a radius connecting the rotation center and the lens center. It is characterized in that it is provided on the outer peripheral side of the lens holder and is installed along the tangential direction of the rotational movement.

According to a third aspect of the present invention, there is provided an objective lens driving device, comprising: a lens holder on which at least two objective lenses having different numerical apertures are mounted; and a light beam having a predetermined rotation center and a center of the objective lens. A lens holder supporting means for switching and moving to the optical axis position and being movable in a focus direction and a tracking direction, a fixing portion for fixing the lens holder supporting means, and a driving coil mounted on the lens holder, and rotating. An axial direction is the focus direction, the relay member includes a relay member rotatably supported by the fixed portion, and a power supply unit configured to supply power to the drive coil from the relay member. And a bridge extending along the tangential direction of the rotational movement of the relay member, connecting the fixed position of the power supply means on the lens holder side to the center of rotation and the center of the lens. Provided on the outer peripheral side of the large lens holder than the radius, and placed along the tangential direction of the rotational movement of the lens holder, characterized in that the erection and.

Further, the power supply means is divided and erected along two forward and reverse tangential directions with respect to the rotational movement of the lens holder.

Alternatively, the power supply means is divided, and is provided so as to extend in two forward and reverse tangential directions with respect to the rotational movement of the lens holder and the relay member.

Also, the fixed position on the lens holder side is arranged with a step in the focus direction.

In addition, a step is provided in the focus direction near each of the divided power supply means where the power supply means intersects three-dimensionally.

The fixed position on the relay member side is arranged with a step in the focus direction. Alternatively, the fixed position on the fixed portion side of the power supply means is arranged with a step in the focus direction.

Further, the elastic support member is made of a plate-like or rod-like spring material. Also, the lens holder
It is rotatably supported on a rotating shaft fixed to the fixed portion.

Alternatively, the relay member is rotatably supported on a rotation shaft fixed to the fixed portion.

The relay member is rotatably supported by using a hinge. Further, the power supply means uses a flexible printed circuit board.

Further, a step is provided in the outer diameter shape of the lens holder in the radial direction from the center of rotation, so that contact between the lens holder and the routing portion of the power supply means is eliminated.

Each of the divided flexible printed circuit boards is twisted at approximately 90 degrees at a portion where the flexible printed circuit board crosses three-dimensionally.

[0025]

Embodiments of the present invention will be described below with reference to the drawings.

(Embodiment 1) FIG. 1 is an exploded perspective view of an objective lens driving device according to a first embodiment of the present invention, and FIG.
2A and 2B are plan views. First, the configuration of the objective lens driving device of the present invention will be described.

Reference numerals 1a and 1b denote objective lenses for forming a laser spot on the information recording surface of the disk 12,
A plurality of discs having different substrate thicknesses such as D or DVD are prepared. A lens holder 2 holds a plurality of objective lenses and has a bearing 2a.

Reference numeral 3 denotes a shaft held by the yoke base 4 in the focusing direction. The shaft 3 holds the lens holder 2 so as to be freely movable around the shaft axis in the directions of rotation and sliding, ie, the tracking direction and the focusing direction. I have. The shaft surface is coated with a fluororesin or the like to reduce the contact friction resistance with the lens holder bearing 2a.

The yoke base 4 is fixed to a head base (not shown) by means such as a spring and an adhesive. The light beam emitted from the light source passes through various optical elements mounted on the optical head, becomes almost perpendicular to the disk by the rising mirror 11, and passes through the objective lens 1a or 1b to the disk 12.
The information recording surface is focused on and the information is recorded and reproduced.

Reference numeral 5 denotes a cylindrical focus coil fixed to the lens holder 2 so as to be coaxial with the bearing 2b, and a focus magnet 7 adhered and fixed to the yoke base 4.
a, 7b are disposed in the magnetic gap formed by the magnetic field. Reference numerals 6a and 6b denote tracking coils which divide a straight line connecting the centers of the lenses into two equal parts and a straight line mm 'passing through the shaft center O.
The lens holder is fixed at an outer diameter position of the lens holder facing the center O, and 6a and 6b are connected in series. 8a,
8b, 8c and 8d each constitute a pair of tracking magnets, and the yoke base 4 passing through the shaft center O.
The upper straight lines nn 'and 11' are bonded and fixed to the yoke base wall surface facing the axis center. The angle formed by the straight lines nn 'and 11' is substantially the same as the angle α formed by the straight line connecting the centers of the objective lenses 1a and 1b and the center O of the shaft. Each tracking magnet is magnetized in two poles in the rotational tangent direction of the lens holder 2.

Like the tracking coil, the magnetic plates 9a and 9b are arranged at the outer diameter position of the lens holder facing the center O on the straight line mm '. The magnetic plates 9a, 9b are opposed to the tracking magnets 8a, 8b or 8c, 8d.
Is attracted to the center position of the two-pole magnetization, so that the lens holder 2 is positioned, and a midpoint return force is generated in the tracking direction and the focus direction.

By supplying a drive current to the focus coil 5 via the power supply line 10, the focus magnet 6
The focus coil 5 placed in the constant magnetic fields a and 6b generates an electromagnetic force in the shaft axis direction, that is, in the sliding direction according to Fleming's law, and operates the lens holder 2 serving as a mover in accordance with the rotation of the disk. A focus operation for correcting the resulting light beam defocus is performed. Similarly, by supplying a drive current to the tracking coils 6a, 6b, the pair of tracking magnets 8a, 8b or 8
tracking coil 6 placed in a constant magnetic field of c, 8d
Reference numerals a and 6b generate a driving force in the direction of rotation of the lens holder, and perform a tracking operation for correcting a deviation between the light beam focal position in the radial direction caused by the rotation of the disk 12 and the disk track.

Next, the driving position and the lens switching operation will be described. In the case of FIG. 2A, the objective lens 1a is positioned at the normal lens driving position by the tracking magnets 8a and 8b and the magnetic plates 9a and 9b. When a disk having a base material thickness corresponding to the objective lens 1a is set, the objective lens 1a is moved to the position of the laser optical axis by a disk discriminating means (not shown) using a difference in the amount of reflected laser light, that is, FIG. The recording / reproducing is performed on the disk at the drive position which remains at the position. At this time, a straight line m
m 'and ll' are substantially collinear. The tracking drive in this position is performed by the tracking magnets 8a, 8b located at positions facing the tracking coils 6a, 6b.
It is done with.

When a disk having a substrate thickness corresponding to the objective lens 1b is set in the state shown in FIG. 2A, the objective lens 1b is selected by the disk discriminating means. Then, a pulse-like drive current within a certain short period of time is applied to the tracking drive current to generate a rotational force on the mover, and the objective lens 1
The lens is switched by rotating the mover until b moves to the laser optical axis position, that is, the drive position in FIG. 2B. At this time, the straight lines mm 'and nn' are substantially the same straight line. Tracking driving at this position is performed by tracking magnets 8c and 8d facing the tracking coils 6a and 6b.

Next, the arrangement of the power supply line 10 will be described. The power supply line 10 is, for example, a flexible flexible printed circuit board line obtained by coating a conductive line of copper foil with a polyimide resin as an insulating material. The power supply line 10 has a fixing member 10a made of a resin material such as a liquid crystal polycarbonate, and is fixed to the power supply line fixing portion 4a of the yoke base 4 via the fixing member 10a. The power supply line 10 is connected to the power supply line fixing unit 4.
a, the lens holder 2 intersects in the focus axis direction while maintaining a certain radius of curvature or more.
It is routed along two forward and reverse tangential directions with respect to the rotation direction, and is fixedly mounted on the outer periphery of the lens holder 2. The fixed position on the lens holder side is a lens holder outer peripheral position larger than a radius connecting the center O and the lens center, that is, on the outermost peripheral cylinder of the lens holder 2 in FIG. It is to be noted that the power supply line 10 is not divided from the power supply line fixing portion 4a, but is routed along the rotational tangent direction of the lens holder 2 while maintaining a curvature radius of a certain value or more, and may be fixed on the outermost peripheral cylinder of the lens holder.

When the power supply line 10 is erected in a divided manner, the power supply line fixing portion 4a is arranged so that the power supply lines do not come into contact with each other near the intersection.
A step is provided in the focusing direction at the mounting position on the lens side or the lens holder 2 side. Alternatively, a step may be provided in the focus direction in the middle of the divided arm to avoid contact at the intersection. Further, the divided power supply lines 10 can be twisted by about 90 degrees at the intersections to provide a surface substantially perpendicular to the focus direction, thereby avoiding contact between the power supply lines.

The outer peripheral shape 2b of the lens holder 2 has a step in the radial direction from the center of the shaft axis.
The configuration is such that the leading portion of the lens holder 2 does not contact the side surface of the lens holder 2.

As described above, there are two drive positions for switching and driving the two lenses. At this time, the power supply line 10 is divided into two mounting positions on the lens holder side, intersects in the axial direction of the shaft, and is disposed on the lens holder 2. Therefore, the configuration is such that there is little difference in the load applied to the lens holder 2.

Further, since the fixing on the lens holder side is provided along the tangential direction on the outermost periphery of the lens holder 2, the curved portion of the power supply line 10 always has a radius of a certain curvature or more, and a load such as warpage of the power supply line. The occurrence of is small. In addition, the outer peripheral shape 2b of the lens holder 2 is provided with a step in the radial direction, so that the power supply line is provided for the operation of the lens holder 2 in the rotation direction and the shaft axis direction or for the change of the driving position due to the lens switching. Since the routing portion 10 and the side surface of the lens holder 2 do not come into contact with each other, no unnecessary load is generated on the power supply line, and stable driving can be obtained.

Further, the fixing position of the power supply line 10 on the lens holder side is the outermost periphery of the lens holder, and the mounting height in the shaft axis direction can be set at the same position as the lens with a constant width. No mounting margin is required for fixing. For this reason, the entire device including the lens holder 2 can be reduced in thickness. If the vicinity of the intersection of the power supply lines 10 is twisted at about 90 degrees, further reduction in thickness can be expected. Further, the arrangement of the power supply lines 10 at the intersections can be configured with a minimum necessary space, which contributes to downsizing of the apparatus. Since the divided power supply line 10 is unified by the fixing member 10a, only one fixing portion on the side opposite to the lens holder is provided, and workability is improved.

In addition, as an effect of fixing the power supply line 10 at the outermost periphery of the lens holder, since the power supply line 10 does not cross the lens mounting position, there is no need to consider the positions of the objective lenses 1a and 1b, and the power supply line fixing portion 4a The degree of freedom of arrangement of the feeder line 10 including the above is increased.

(Embodiment 2) FIG. 3A shows (Embodiment 2) of the present invention. Note that components having the same functions as those in the first embodiment are described with the same reference numerals.

The power supply line 10 is fixed to the yoke base 4 via a support leaf spring 16. The support leaf spring 16 has a feeder line fixing portion 16a, and the feeder line fixing member 10a is mounted and fixed thereto. Other members are shown in FIGS. 1 (a) and 1 (b).
Is the same as

The supporting plate spring 16 is fixed to the yoke base 4, and the feeder line fixing portion 16a is movable only in the focus direction due to the resiliency of the plate spring portion.

The material of the supporting leaf spring is a spring material such as SUS material, and the thickness and the length l of the leaf spring portion are designed so that the spring constant is smaller than the torsional moment of the leading portion of the power supply line 10. I have. In addition, the feeder line fixing portion 16a
Feed line 10 so that the operation in the focus direction is not hindered.
Is connected to the substrate on the optical base with a sufficient length from the fixing member 10a. Alternatively, a thin-film wiring pattern is provided on the support leaf spring 16, and the power supply line 10 and the support leaf spring 1 are provided.
6 can also be used.

When the lens holder 2 moves in the focusing direction when the fixing portion of the feeder line 10 on the side opposite to the lens holder is inoperable, the feeder line 10 having a spring property is deformed by receiving a torsional moment, and the two ends are fixed. To absorb the displacement difference. At this time, a load is applied to the lens holder 2 as a reaction force of the power supply line 10, and the smooth sliding operation between the shaft 3 and the lens holder 2 is hindered.

However, in the configuration of the present embodiment, the fixing portion on the side opposite to the lens holder, that is, the feeder line fixing portion 16a is operable in the focus direction, so that the feeder line 10 is routed in a track shape according to the operation of the lens holder 2. The portion also follows, and the deformation of the power supply line 10 can be reduced. Therefore, the load on the lens holder 2 of the power supply line 10 is suppressed, and a smoother sliding operation can be realized.

According to this configuration, the load in the focusing direction can be suppressed without unnecessarily lengthening the power supply line 10, and the apparatus can be downsized.

As shown in FIG. 3 (b), instead of the support spring 16, a U-shaped wire support spring 17 formed by bending a wire-like wire is opened in the yoke base side and both ends thereof. A similar effect can be expected in a configuration in which the power supply line support fixing portion 17a is provided at the center of the notch material and the support fixing portion is freely supported in the focus direction by rotational support.

(Embodiment 3) FIG. 4 shows (Embodiment 3) of the present invention. Note that components having the same functions as those in the first embodiment are described with the same reference numerals.

The relay shaft 18 is fixed to the yoke base 4 in the focus direction, and a relay member 19 having a cylindrical outer shape is rotatably supported by the relay shaft 18. The fixing of the power supply line 10 on the side opposite to the lens holder is provided on the outer peripheral surface of the relay member 19 along the rotational tangential direction. The power supply line 10 is connected to the substrate on the optical base as a small-diameter wire independent from the vicinity of the inner periphery of the relay member 19 so as not to hinder the operation of the relay member 19 in the rotation direction. Other members are the same as those in FIGS. 1A and 1B.

Each of the divided arms of the power supply line 10 is deformed by changing the radius of curvature of the curved portion at each drive position by switching the lens. At that time, a rotational load of the divided power supply line 10 is generated in the rotational tangent direction of the lens holder 2 or the relay member 19, that is, in the tracking direction.

When the fixed portion of the power supply line 10 on the side opposite to the lens holder is inoperable in the tangential direction, the load of each arm of the divided power supply line 10 has a different radius of curvature of the curved portion. A load is generated due to a difference in spring properties in the rotation direction of the lens holder 2, and asymmetry is given to the operation of the lens holder 2 in the tracking direction. Tracking magnet 8
This also affects the positioning of the lens holder 2 in the rotation direction with respect to the yoke base 4 by the magnetic springs of the magnetic plates 9a and 9b and the magnetic plates 9a and 9b.

However, in the configuration of the present embodiment,
In each drive position, the relay member 19 rotates until the load in the rotational tangential direction of each arm of the divided power supply lines 10 is offset, so that the power supply lines 10 are always drawn in a balanced curved shape. State. Therefore, no asymmetry is given to the operation of the lens holder 2 in the tracking direction, and the positioning of the lens holder 2 by the magnetic spring is not affected.

According to this configuration, the load in the tracking direction can be suppressed without unnecessarily lengthening the power supply line 10, and the device can be downsized.

Instead of the relay shaft 18 and the relay member 19, a hinge having a cylindrical surface is installed on the yoke base 4 so that the rotation axis is in the focus direction, and a feeder is provided along the rotation tangent on the outer circumference of the hinge cylinder. 10 may be fixed on the side opposite to the lens holder.

[0057]

As described above, according to the present invention, the power supply line for supplying the drive current to the drive coil mounted on the lens holder is divided into a plurality of lines and intersects in the sliding direction so that the center of the shaft and the center of the lens are separated. Are arranged along the rotational tangential direction at the outer peripheral position of the lens holder having a radius larger than the radius connecting the two. It is possible to provide an objective lens driving device capable of obtaining stable driving.

[Brief description of the drawings]

FIG. 1 is a perspective view of an objective lens driving device according to a first embodiment of the present invention.

FIG. 2 is a plan view of the objective lens driving device according to the first embodiment of the present invention.

FIG. 3 is a perspective view of an objective lens driving device according to a second embodiment of the present invention.

FIG. 4 is a perspective view of an objective lens driving device according to a third embodiment of the present invention.

FIG. 5 is a plan view of a conventional objective lens driving device.

[Explanation of symbols]

 1a, 1b Objective lenses 2, 2a, 2b Lens holders, bearings, outer peripheral shape 3 Shafts 4, 4a Yoke base, power supply line fixing unit 5 Focus coils 6a, 6b Tracking coils 7a, 7b Focus magnets 8a, 8b, 8c, 8d Tracking magnet 9a, 9b Magnetic plate 10, 10a Power supply line, power supply line fixing member 11 Start-up mirror 12 Disk 16 Support plate spring 17 Wire support spring 18 Relay shaft 19 Relay member

Continued on the front page (72) Inventor Hiroshi Yamamoto 1006 Kadoma Kadoma, Osaka Pref. Matsushita Electric Industrial Co., Ltd. (72) Inventor Hideji Iwasaki 1006 Ojidoma Kadoma, Kadoma City Osaka Pref. Person Yasuo Nishihara 1006 Kazuma Kadoma, Kadoma City, Osaka Prefecture, Japan Matsushita Electric Industrial Co., Ltd. (72) Inventor Akihiro Sakaguchi 1006 Kadoma Kadoma, Kadoma City, Osaka Prefecture Inside Matsushita Electric Industrial Co., Ltd. 1006 Kadoma Matsushita Electric Industrial Co., Ltd. F term (reference) 5D118 AA02 AA26 BA01 BB02 BF02 BF03 DC03 EA02 EB15 EC03 EC07 EE05 EF09 FA06 FB12 FB20 FC07 FC10

Claims (16)

[Claims] 1. An objective lens driving device for an optical recording / reproducing apparatus, comprising: a lens holder on which at least two objective lenses having different numerical apertures are mounted; and a light beam having a predetermined rotation center and a center of the objective lens. A lens holder supporting means for switching and rotating to an axial position, and being movable in a focus direction and a tracking direction, a fixing part for fixing the lens holder supporting means, a driving coil mounted on the lens holder, and Power supply means for supplying power to the drive coil from a portion, and a fixed position of the power supply means on the lens holder side is provided on an outer peripheral side of the lens holder larger than a radius connecting the rotation center and the lens center; and An objective lens driving device, which is installed along the tangential direction of the rotational movement. 2. An objective lens driving device for an optical recording / reproducing device, comprising: a lens holder on which at least two objective lenses having different numerical apertures are mounted; and a light beam having a predetermined rotation center and a center of the objective lens. A lens holder supporting means for switching and rotating to an axial position and movable in a focus direction and a tracking direction, a fixing portion for fixing the lens holder supporting means, a drive coil mounted on the lens holder, and a focus direction An elastic supporting member fixed to the fixing portion that can be deformed into, and a power supply unit that supplies power to the drive coil from the elastic supporting member.
A fixed position of the power supply unit on the lens holder side is provided on an outer peripheral side of the lens holder that is larger than a radius connecting the rotation center and the lens center, and is provided along a tangential direction of the rotational movement. Characteristic objective lens driving device. 3. An objective lens driving device for an optical recording / reproducing apparatus, comprising: a lens holder on which at least two objective lenses having different numerical apertures are mounted; and a light beam having a predetermined rotation center and a center of the objective lens. A lens holder supporting means for switching and rotating to an axial position and movable in a focus direction and a tracking direction, a fixing portion for fixing the lens holder supporting means, and a drive coil mounted on the lens holder; An axial direction is a focus direction, a relay member rotatably supported with respect to the fixed portion, and a power supply unit that supplies power to the drive coil from the relay member, and a fixing position of the power supply unit on the relay member side. The relay unit is provided on a rotating side surface of the relay member, and is installed along a tangential direction of the rotational movement of the relay member. The fixed position of the lens holder is provided on the outer peripheral side of the lens holder larger than the radius connecting the rotation center and the lens center, and is provided along the tangential direction of the rotation movement of the lens holder. Objective lens drive. 4. The objective lens driving device according to claim 1, wherein the power supply means is divided and disposed so as to extend in two forward and reverse tangential directions with respect to the rotational movement of the lens holder. 5. The objective lens driving device according to claim 3, wherein the power supply means is divided and arranged so as to extend in two forward and reverse tangential directions with respect to the rotational movement of the lens holder and the relay member. 6. The objective lens driving device according to claim 4, wherein the fixed position of the power supply means on the lens holder side is provided with a step in the focus direction. 7. The objective lens driving device according to claim 4, wherein each of the divided power supply means is provided with a step in a focus direction near a three-dimensional intersection. 8. The objective lens driving device according to claim 5, wherein the fixed position on the relay member side is disposed with a step in the focus direction. 9. The objective lens driving device according to claim 1, wherein a fixed position of the power supply means on a fixed portion side is arranged with a step in a focus direction. 10. The objective lens driving device according to claim 2, wherein the elastic support member is a plate-like or rod-like spring material. 11. The lens holder according to claim 1, wherein the lens holder is rotatably supported on a rotating shaft fixed to the fixed portion.
4. The objective lens driving device according to any one of items 3 to 3. 12. The objective lens driving device according to claim 3, wherein the relay member is rotatably supported on a rotation shaft fixed to the fixed portion. 13. The objective lens driving device according to claim 3, wherein the relay member is rotatably supported by using a hinge. 14. The objective lens driving device according to claim 1, wherein said power supply means uses a flexible printed circuit board. 15. The method according to claim 1, wherein a step is provided in an outer diameter shape of the lens holder in a radial direction from the center of rotation, so that contact between the lens holder and a routing portion of the power supply means is eliminated. Objective lens drive. 16. The objective lens driving device according to claim 14, wherein each of the divided flexible printed circuit boards is twisted by approximately 90 degrees at a portion where the flexible printed circuit board crosses three-dimensionally.