JP2008102999A - Optical pickup device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an optical pickup device capable of obtaining good operating characteristics of a lens actuator, and eliminating the necessity of a configuration for raising a laser beam in a plurality of optical paths below a lens holder by selectively switching a plurality of objective lenses in one optical path to be used. <P>SOLUTION: The optical pickup device is provided with one lens holder 31 for holding two objective lenses 24 and 25, a plurality of wires 33 set to expand in a truncated chevron shape from the lens holder 31 to one side and to support the lens holder 31 to move, and rotary driving means 41, 42, and 51 to 54 for rotary-driving the lens holder 31 by an electric magnetic force. The lens holder 31 is rotated by the driving forces of the rotary driving means, and thus the two objective lenses 24 and 25 are sequentially arranged to vary in one optical path. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to an optical pickup device that supports a plurality of types of optical disks by switching between a plurality of objective lenses.

  2. Description of the Related Art There has been an optical pickup device that can handle a plurality of types of optical disks by holding two objective lenses in a lens holder and switching between the two objective lenses.

  In such an optical pickup device, two mirrors for raising laser light are provided under the lens holder, and two optical paths are generated by these two mirrors, and the first objective lens is disposed on one of the optical paths. In many cases, the second objective lens is arranged on the other optical path (for example, Patent Documents 1 to 3). And the objective lens to be used is switched simultaneously by selectively switching the optical path used among these two optical paths.

Further, the present applicant provides the lens holder with a rotating shaft, and provides a bearing for receiving the rotating shaft on the frame side to support the lens holder so that the lens holder can rotate and move up and down by sliding the shaft. Previously, a lens actuator for an optical pickup that switches between two objective lenses in one optical path by selectively moving two objective lenses on one optical path by rotational driving has been developed.
JP 2005-196859 A JP 2006-134474 A JP 09-212910 A

  In the configuration in which a half mirror and a beam splitter are provided under the lens holder and two optical paths are formed corresponding to two objective lenses as in the techniques of Patent Documents 1 to 3, only one rising mirror is disposed. Compared to a single lens type pickup, the problem is that the cost of parts increases, the size of the pickup increases due to an increase in the arrangement space of the optical system, and the optical loss increases in the optical system due to the increase in the number of beam splitting locations. Arise.

  In particular, there are currently two standards for optical discs using blue-violet lasers, and these two types of optical discs use the same laser wavelength but differ in the required numerical aperture (NA) of the objective lens. Has characteristics. Therefore, if two optical paths are formed to correspond to these two types of optical discs, two optical paths must be generated with laser light of the same wavelength, and in this case, the optical loss due to beam splitting becomes considerably large. Conceivable.

  Further, as shown in FIG. 8, the optical pickup of the type that is rotationally driven by the above-described shaft sliding has operating characteristics in a range where the displacement level is small as compared with a lens actuator of a type in which the lens holder is supported by a spring such as a wire. As a result, the drive control when the objective lens is displaced by a small amount is difficult and the current consumption increases.

  In addition, in the shaft sliding type, only the two axes of the focus direction along the sliding axis and the rotation direction (tracking direction) about the sliding axis can be driven, and the tilt angle of the objective lens is adjusted. There was a structural drawback that could not be done.

  An object of the present invention is to support a lens holder with a spring to obtain good operating characteristics from a small displacement level to a large displacement level, and to selectively use a plurality of objective lenses on one optical path. Accordingly, an object of the present invention is to provide an optical pickup device that does not require a configuration for starting up laser light through a plurality of optical paths under the lens holder.

  In order to achieve the above object, the present invention provides an optical pickup apparatus capable of recording or reproducing data corresponding to a plurality of types of optical disks by switching and using a plurality of objective lenses. One lens holder to be held, an optical system that guides the emitted laser light to the optical path of the lens holder and guides reflected light from the optical disc to the optical sensor through the optical path, and one end side thereof are fixed to the lens holder. The other end side is fixed to the frame, and includes a plurality of wires that support the lens holder in a movable state, and a driving unit that applies a driving force to the lens holder by the action of electromagnetic force, and the plurality of wires includes the objective lens. As seen in the optical axis direction of the lens holder, the driving means is stretched in a direction spreading in a C shape from the lens holder to one side. A rotation driving means capable of applying a driving force in a rotation direction centering on a rotation axis that is parallel to the optical axis of the lens and intersecting the lens holder, wherein the plurality of objective lenses are outside the rotation axis portion of the lens holder. The plurality of objective lenses are sequentially arranged on one optical path by rotating the lens holder by the driving force of the rotation driving means. did.

According to such means, the lens holder is rotationally driven and any one of the plurality of objective lenses is selectively placed on the optical path, so that the plurality of objective lenses can be switched using only one optical path. I can do it. Therefore, there is no need to provide a beam splitter such as a half mirror or prism that launches laser light in multiple optical paths under the lens holder, reducing component costs, downsizing the optical pickup configuration, and loss of laser light in the optical system. Can be reduced. Furthermore, since the lens holder is supported by a wire, good operating characteristics can be obtained from a small range of displacement level to a large range, and tilt angle adjustment can also be realized.
Specifically, the lens holder may be configured to hold two objective lenses at a portion opposite to the side where the plurality of wires are stretched.

  As long as the objective lens is placed on the lens holder in a range that deviates from the rotation center of the lens holder, the lens can be placed on the side where the wire is stretched, on the opposite side, or on the side perpendicular thereto. Two objective lenses can be selectively arranged on one optical path by rotating the holder. However, in order to allow the laser beam to pass through so that the wire does not get in the way, or to smoothly rotate the lens holder by bending the wire, or to adjust the tilt angle, the wire is stretched as described above. By disposing the objective lens on the opposite side to the provided side, smooth operation can be obtained when the objective lens is switched or servo controlled.

  More specifically, the lens holder is supported by six wires, and is supported by six wires. Of these, four wires are provided two by two on the upper surface side of the lens holder. It is preferable that the wire is spread and fixed in the shape of a letter, and the remaining two wires are spread and fixed in a letter C shape on the lower surface side of the lens holder.

  By using 6 wires in this way, 3 types of current signals can be sent to the lens holder as a set of 2 wires, and 3 types of electromagnetic coils are attached to the lens holder to drive the focus of the objective lens. It is possible to perform three-axis movements of tracking drive and tilt angle drive.

Specifically, the moving direction of the objective lens arranged on the optical path among the plurality of objective lenses by the rotational driving unit is set to be substantially overlapped with the tracking direction of the optical disc, and the rotational driving unit includes the rotational driving unit. In addition to the means, a focus driving means for driving the lens holder in the focus direction of the objective lens, and a tilt angle driving means capable of applying a driving force in a direction to change the inclination angle along the circumferential direction of the optical disk are included. It is good to have a configuration.
With this configuration, switching of the objective lens and triaxial movement are possible.

  More specifically, the rotation driving means includes at least two rotation driving electromagnetic coils attached to a side surface of the lens holder on which the wire is stretched and an opposite side surface thereof, and the plurality of objectives. A plurality of sets of magnets that are respectively disposed to face the rotation driving electromagnetic coils when the lenses are arranged on the optical path may be used.

  More specifically, the lens holder is configured to have a shape that is long in a linear direction connecting the side on which the wire is stretched and the opposite side when viewed in the optical axis direction of the objective lens, and short in a direction perpendicular thereto. The tilt angle driving means includes at least two tilt driving electromagnetic coils attached to both side surfaces along the longitudinal direction of the lens holder, and the tilt driving within a range not overlapping with the rotational movement range of the lens holder. It is good to comprise from two magnets arranged opposite to the electromagnetic coil for use.

  With such a configuration, the rotation driving of the lens holder by wire support and the tilt angle driving of the lens holder can be mixed and independently performed.

  As described above, according to the present invention, good operating characteristics can be obtained from a small range to a large range of displacement level, and a plurality of objective lenses can be selectively placed on one optical path for use. I can do it. Therefore, there is no need for an optical component for launching laser light in a plurality of optical paths under the lens holder, and the effects of reducing the component cost, downsizing the configuration of the pickup, and reducing the optical loss in the optical system can be achieved. can get.

  Further, the tilt angle cannot be adjusted in the shaft sliding type, but in the present invention, the tilt angle can be adjusted because of the wire support type.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
1A and 1B show an overall configuration of an optical pickup device 10 according to an embodiment of the present invention, where FIG. 1A is a plan view and FIG. 1B is a side view.
The optical pickup device 10 according to the present embodiment is compatible with various optical discs such as CD (compact disc), DVD (digital versatile disc), HD-DVD (high density DVD), and BD (Blu-ray disc). Recording or reproduction is performed.

  The optical pickup device 10 includes a two-wavelength semiconductor laser 11 that outputs laser light for CD (for example, wavelength 780 nm) and laser light for DVD (for example, wavelength 650 nm), and HD-DVD or BD (for example, wavelength 405 nm). ), A dichroic for converging the optical paths of the laser beams emitted from the two semiconductor lasers by reflecting or transmitting according to the wavelength of the laser beams. A prism 15, a quarter-wave plate 18 and a polarization beam splitter 16 for separating a traveling wave and a reflected wave to the optical disc, a collimator lens 17 for collimating light emitted from the semiconductor laser, and a reflected beam A detection lens 19 for adding astigmatism and a detection surface divided into a plurality of parts, and a reflected beam from an optical disk An optical sensor 20 that emits light, a rising mirror 21 that reflects and directs the laser light toward the objective lens, and two objective lenses 24 and 25 that focus the laser light on the recording surface of the optical disk and collect the reflected light. A lens actuator 30 for driving the objective lenses 24 and 25 is provided. The optical components 11 to 21 and the lens actuator 30 are arranged on an opto-base formed in one block, for example, so that the optical pickup device 10 is configured.

  One of the two objective lenses 24 and 25 is a BD objective lens 25 having a large numerical aperture NA, and the other is an objective lens 24 for CD, DVD, and HD-DVD having a smaller numerical aperture.

FIG. 2 is a perspective view showing the lens actuator 30 of FIG. 3A and 3B show details of the lens actuator 30, wherein FIG. 3A is a plan view and FIG. 3B is a side sectional view.
The lens actuator 30 includes a lens holder 31 that holds two objective lenses 24 and 25, first coils 41 and 42 for rotational driving, and a second coil 43 for tilt angle driving, which are attached to the side surface of the lens holder 31. 44, a focus driving third coil 45 projecting from the bottom surface of the lens holder 31, and six wires for supporting the lens holder 31 and supplying current to the first to third coils 41-45. 33, a frame plate 35 to which one end side of the wire 33 is fixed, magnets 51 to 54 for rotation driving and magnets 55 and 56 for tilt angle driving disposed opposite to the side surface of the lens holder 31; An annular focus driving magnet 57 arranged so as to surround the outside of the coil, a yoke 58 arranged inside the third coil, and the like.

  The lens holder 31 is configured in a shape that is long in one direction and short in a direction perpendicular to the one when viewed in a plane as shown in FIG. 3A, and the two objective lenses 24 and 25 are arranged on the upper surface of the lens holder 31. Are fixed side by side in a direction perpendicular to the longitudinal direction at a portion close to the end in the longitudinal direction. In addition, since the working distance differs between the first objective lens 24 and the second objective lens 25, it is preferable to fix the objective lenses 24 and 25 by providing a step in the height direction according to the difference.

  The first coils 41, 42 and the second coils 43, 44 are thin flat coils in which coil wires are wound along a rectangular path, and the first coils 41, 42 are disposed on both side surfaces of the lens holder 31 in the longitudinal direction. The second coils 43 and 44 are respectively fixed to the central portions of both side surfaces extending along the longitudinal direction of the lens holder 31.

  The six wires 33 are connected to the upper surface side of the lens holder 31 and two to the bottom surface side of the lens holder 31 through a wire fixing plate 37 by soldering or the like. The four wires 33 on the upper surface side are stretched so as to spread in a pair of two in the longitudinal direction of the lens holder 31 from the central portion of the upper surface of the lens holder 31, and the two wires on the lower surface side. 33 ... are stretched so as to spread in the shape of a letter C in the same longitudinal direction from the central portion of the bottom surface avoiding the third coil. Thus, when the lateral driving force is applied to the lens holder 31, the force is distributed to all the wires 33, so that all the wires 33 are almost evenly distributed. The lens holder 31 is rotationally driven around the joint portion of the six wires 33. Further, at the time of this rotational drive, the wire 33... Bends, so that displacement in the direction of the frame plate 35 also occurs. However, this displacement amount can be obtained by arranging the two objective lenses 24 and 25 close to each other to reduce the rotation angle. Will be negligible.

FIG. 4 is an exploded view for explaining the positional relationship between the rotational drive magnets 51 to 54 and the electromagnetic coils 41 and 42. In the figure, X indicates the rotational movement direction, and Y indicates the height direction.
Two magnets 51 to 54 for rotational driving are provided side by side along the outer periphery of the rotational movement of the lens holder 31 on one side and the other side in the longitudinal direction of the lens holder 31. On one side, the magnetic poles of the magnets 51 and 52 are vertically divided into two to form an N pole and an S pole, and when the rectangular first coil 41 is arranged so as to straddle this dividing line, A lateral driving force can be applied according to the current of one coil.

The rotation driving magnets 51 and 52 are fixed at such an angle that the first objective lens 24 is disposed on the optical path and one magnet 51 overlaps the first coil 41, and the other magnet 52. Is fixed in such an arrangement that the second objective lens 25 overlaps the first coil 41 at an angle at which the second objective lens 25 is arranged on the optical path.
The magnets 53 and 54 and the electromagnetic coil 42 provided on the other side in the longitudinal direction of the lens holder 31 have the same configuration.

FIG. 5 shows an exploded view for explaining the positional relationship between the magnets 55 and 56 for tilt driving and the electronic coils 43 and 44. In the figure, X indicates the horizontal direction along the side surface of the lens holder 31, and Y indicates the height direction.
The tilt driving magnets 55 and 56 have a vertically thin shape and a cylindrical surface facing the lens holder 31 so that they do not hit the side surface of the lens holder 31 even if the angle of the lens holder 31 is changed by rotation. As shown in FIG. 5A, each magnetic pole is vertically divided into two to form an N pole and an S pole.

  Further, the second coils 43 and 44 for tilt driving are formed in a horizontally long shape so that a portion close to the magnet is generated even when the rotation angle of the lens holder 31 is changed, and the magnetic pole dividing lines of the magnets 55 and 56 are formed. As a result, the vertical driving force is applied according to the amount of current of the second coils 43 and 44. In addition, the tilting angle of the lens holder 31 can be finely adjusted by applying a driving force in the opposite direction on one side and the other side of the two second coils 43 and 44 for tilt driving. It has become.

FIG. 6 is a plan view showing each state when one and the other of the two objective lenses 24 and 25 are used.
According to the lens actuator 30 configured as described above, in the initial state where no current is passed through the first to third coils 41 to 45, as shown in FIG. It will be in the state located on the optical path above the mirror 21. In this state, when a minute driving current is passed through the first coils 41 and 42, the lens holder 31 is slightly displaced in the rotation direction, and the tracking adjustment of the objective lens 24 is performed. Further, when a minute driving current is passed through the second coil 43, 44 or the third coil 45, the lens holder 31 is slightly tilted along the circumferential direction of the optical disk to adjust the tilt angle, or the lens holder It is possible to adjust the focus by slightly shifting 31 in the focus direction.

  Further, by applying a constant driving current to the first coils 41 and 42 to give a slightly large driving force to the lens holder 31, the first coils 41 and 42 rotate in the other direction as shown in FIG. 6B. While the lens holder 31 rotates to positions facing the driving magnets 52 and 53, respectively, a bias current is applied to the first coils 41 and 42 so as to apply a driving force against the bending of the wires 33 at this timing. , The BD objective lens 25 is placed on the optical path above the rising mirror 21.

  In this state, the driving current of the first coils 41 and 42 is displaced, so that the lens holder 31 is slightly displaced in the rotation direction, and the tracking adjustment of the objective lens 25 can be performed. By applying a drive current to the 43 and 44 and the third coil 45, the focus adjustment and tilt angle adjustment of the objective lens 25 can be performed.

FIG. 7 is a view showing a modification in which the initial position of the lens holder 31 is changed.
As shown in FIG. 7A, in the initial state where no current is passed through the first to third coils 41 to 45, the optical path above the rising mirror 21 is an intermediate position between the two objective lenses 24 and 25. It may be set to come to.

  When set in this way, the currents of the coils 41 to 45 of each system are controlled in a state where a bias current in the clockwise direction flows through the first coils 41 and 42, as shown in FIG. 7B. In addition, it is possible to perform tracking adjustment, focus adjustment, and tilt angle adjustment by arranging the objective lens 25 for BD on the optical path.

  Further, as shown in FIG. 7C, by controlling the currents of the coils 41 to 45 in each system in a state where a bias current in the counterclockwise direction is passed through the first coils 41 and 42, the CD to HD-DVD is controlled. The objective lens 24 can be arranged on the optical path for tracking adjustment, focus adjustment, and tilt angle adjustment.

  As described above, according to the optical pickup device 10 of this embodiment, the two objective lenses 24 and 25 can be switched and used in one optical path, and the switching of the objective lenses 24 and 25 can be performed using a wire. 33: It can be realized by a support type lens actuator 30.

  As a result, the lens actuator 30 can have good operating characteristics from a small range to a large range of the displacement level, and an optical configuration for forming a plurality of optical paths under the lens holder 31 is not required. Can be made compact and the loss of laser light can be reduced.

  Moreover, the smooth movement of the lens holder 31 can be obtained without any inconvenience for allowing the laser beam to pass by the manner of tensioning the wires 33, the shape of the lens holder 31, and the arrangement of the objective lenses 24 and 25 as described above. Also, independent tracking adjustment and tilt angle adjustment with little interference due to the arrangement of the magnets 51 to 54 for rotation driving and the coils 41 and 42 and the arrangement of the magnets 55 and 56 for tilt angle driving and the coils 43 and 44. And can be done.

  The present invention is not limited to the above-described embodiment, and various modifications can be made. For example, the arrangement and configuration of the focus driving magnet and the electromagnetic coil are not limited to those shown in FIG. 2B. For example, only the tilt angle driving coils 43 and 44 and the magnets 55 and 56 are used for focus driving. Tilt angle drive can be realized, and the lens holder 31 is formed long in the height direction, while the rotation drive magnets 51 to 54 and the focus drive magnets are provided below or above the coils 41 and 42. Various modifications are possible, such as providing a flat coil and thereby performing focus driving.

  Further, in the above embodiment, the objective lenses 24 and 25 are two for BD and one for CD and DVD. However, the types of the objective lenses 24 and 25 are not limited, and three objective lenses 24 are used. , 25 are arranged side by side in the same manner in the lens holder 31 so that the three objective lenses 24, 25 can be switched.

  In the example shown in FIG. 6, the DVD objective lens 24 is arranged on the optical path in the initial state. Conversely, the BD objective lens 25 is arranged on the optical path in the initial state. Also good.

  In addition, as a magnet for rotation driving, a plurality of sets of magnets are provided so as to face the coils for rotation driving when each objective lens is arranged on the optical path. Also good. Further, a plurality of sets of coils for rotational driving may be provided on both side surfaces of the lens holder.

  In addition, the details specifically shown in the embodiment such as the optical configuration from the laser output device of the optical pickup to the rising mirror or the optical sensor can be appropriately changed without departing from the spirit of the invention.

It is a figure which shows the whole structure of the optical pick-up of embodiment of this invention. It is a perspective view which shows the lens actuator of FIG. The detail of a lens actuator is shown, (a) is the top view, (b) is a sectional side view. It is an exploded view explaining the arrangement | positioning relationship between the magnet for rotation drive, and an electronic coil. It is an exploded view explaining the arrangement | positioning relationship between the magnet for tilt drive, and an electronic coil. It is the top view which showed the state in the case of using each of two objective lenses. It is a top view which shows the modification which changed the initial position of the lens holder. It is a graph which shows the operating characteristic of a shaft sliding type and a spring support type.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Optical pick-up apparatus 21 Stand-up mirror 24 1st objective lens 25 2nd objective lens 30 Lens actuator 31 Lens holder 33 Wire 35 Frame board 41, 42 1st coil 43, 44 2nd coil for tilt angle drive 45 Third Coil for Focus Driving 51-54 Magnet for Rotation Driving 55, 56 Magnet for Tilt Angle Driving 57 Magnet for Focus Driving

Claims (7)

In an optical pickup device capable of recording or reproducing data corresponding to a plurality of types of optical discs by switching between two objective lenses,
One lens holder for holding the two objective lenses;
An optical system that guides the emitted laser light to the optical path of the lens holder and guides the reflected light from the optical disk to the optical sensor through the optical path;
Six wires that have one end fixed to the lens holder and the other end fixed to the frame to support the lens holder in a movable state;
Driving means for applying a driving force to the lens holder by the action of electromagnetic force;
With
Of the six wires, four wires are on the upper surface side of the lens holder, and the remaining two are on the lower surface side of the lens holder, from the lens holder to one side when viewed in the optical axis direction of the objective lens. It is stretched in the direction of spreading in a C shape,
The lens holder is formed in a shape that is long in a linear direction connecting the side where the six wires are stretched and the opposite side when viewed in the optical axis direction of the objective lens, and is short in a direction perpendicular to the linear direction. And holding the two objective lenses in a state of being arranged in a direction perpendicular to the longitudinal direction of the lens holder at a position closer to the side where the wire in the longitudinal direction is not stretched than the central part of the lens holder,
The driving means includes
Centering on an axis that is parallel to the optical axis of the plurality of objective lenses and that passes through the central portion of the lens holder, comprising an electromagnetic coil provided on both side surfaces in the longitudinal direction of the lens holder and a magnet disposed opposite thereto. Rotation driving means for applying a driving force in the direction of rotation,
Focus drive means for driving the lens holder in the focus direction of the objective lens;
A tilt angle that includes an electromagnetic coil provided on both side surfaces along the longitudinal direction of the lens holder and a magnet disposed opposite thereto, and applies a driving force in a direction to change the tilt angle along the circumferential direction of the optical disk. Driving means,
The optical pickup device, wherein the lens holder is rotated by a driving force of the rotation driving means, so that the two objective lenses can be sequentially arranged on one optical path. In an optical pickup device capable of recording or reproducing data corresponding to a plurality of types of optical discs by switching and using a plurality of objective lenses,
One lens holder for holding the plurality of objective lenses;
An optical system that guides the emitted laser light to the optical path of the lens holder and guides the reflected light from the optical disk to the optical sensor through the optical path;
A plurality of wires having one end fixed to the lens holder and the other end fixed to the frame to support the lens holder in a movable state;
Driving means for applying a driving force to the lens holder by the action of electromagnetic force;
With
The plurality of wires are stretched in a direction spreading in a C shape from the lens holder to one side when viewed in the optical axis direction of the objective lens,
The driving means includes rotational driving means capable of applying a driving force in a rotational direction around a rotational axis parallel to the optical axes of the plurality of objective lenses and intersecting the lens holder,
The plurality of objective lenses are held in a state aligned in the rotation direction at a portion outside the rotation axis portion of the lens holder,
The optical pickup device, wherein the plurality of objective lenses are sequentially arranged on one optical path by rotating the lens holder by a driving force of the rotation driving means.   3. The optical pickup device according to claim 2, wherein the lens holder is configured to hold two objective lenses at a portion opposite to a side where the plurality of wires are stretched. The lens holder is
Supported by 6 wires,
Of these, four wires are spread and fixed in a letter C shape two by two on the upper surface side of the lens holder,
The remaining two wires are spread and fixed in a C shape on the lower surface side of the lens holder,
The optical pickup device according to claim 2 or 3, wherein The direction of movement of the objective lens arranged on the optical path among the plurality of objective lenses by the rotation driving means is set to a direction that substantially overlaps the tracking direction of the optical disc,
The driving means includes
In addition to the rotational drive means,
Focus drive means for driving the lens holder in the focus direction of the objective lens;
5. An optical pickup device according to claim 2, further comprising a tilt angle driving means capable of applying a driving force in a direction in which the tilt angle along the circumferential direction of the optical disk is changed. . The rotation driving means is
At least two electromagnetic coils for rotational drive attached to the side surface of the lens holder on which the wire is stretched and the opposite side surface;
A plurality of sets of magnets respectively disposed opposite to the rotational driving electromagnetic coil when the plurality of objective lenses are disposed on the optical path;
The optical pickup device according to claim 5, comprising: The lens holder is configured in a shape that is long in a linear direction connecting the side where the wire is stretched and the opposite side when viewed in the optical axis direction of the objective lens, and is short in a direction perpendicular to the linear direction.
The tilt angle driving means includes:
At least two tilt driving electromagnetic coils attached to both side surfaces along the longitudinal direction of the lens holder;
Two magnets arranged opposite to the tilt driving electromagnetic coil in a range not overlapping the rotational movement range of the lens holder;
The optical pickup device according to claim 5, wherein the optical pickup device is configured as follows.

Images