JPH1011790A - Optical pickup device and disk player device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To miniaturize the constitution of an optical pickup device by connecting terminals on the ground side with each other, in each driving coil of each biaxial actuator. SOLUTION: Optical lenses 16, 17 are operated by moving in the focusing and tracking directions by biaxial actuators 14, 15. With a driving current supplied to the focusing driving coils 1, 3 in each actuator 14, 15, coil bobbins 21, 29 are operated by moving in the focusing direction. In addition, with a driving current supplied to the tracking driving coils 2, 4, in each actuator 14, 15, the bobbins 21, 29 are operated by moving in the tracking direction. In this case, the ground terminals of the coils 1, 3 are connected with each other, as are those of the coils 2, 4.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical pickup device for writing and reading information signals to and from an optical recording medium such as an optical disk, and a recording / reproducing apparatus for recording and reproducing information signals to and from the optical disk. It belongs to the technical field related to a disc player device.

[0002]

2. Description of the Related Art Conventionally, optical recording media such as various optical disks have been proposed as information signal recording media, and optical pickup devices for writing and reading information signals to and from such optical recording media have been proposed. ing.
Such an optical recording medium includes a transparent substrate made of a transparent material such as polycarbonate, and a signal recording layer formed on one main surface of the transparent substrate.

In the optical pickup device, a semiconductor laser serving as a light source is housed in a frame, an objective lens into which a light beam emitted from the semiconductor laser is incident via a beam splitter, and a photodetector (photodetector).
Is configured.

The light beam incident on the objective lens is condensed and irradiated on the signal recording surface of the optical recording medium by the objective lens. At this time, this light beam is irradiated onto the optical recording medium from the transparent substrate side of the optical recording medium, passes through the transparent substrate, and is condensed on the signal recording surface, which is the surface of the signal recording layer. Is done. The objective lens is supported by a biaxial actuator and is moved to constantly focus the light beam on a portion of the signal recording surface where an information signal is recorded, that is, on a recording track.

[0005] When the optical recording medium is formed in a disk shape, the recording track is formed in a substantially concentric spiral shape on the main surface of the optical recording medium.

The biaxial actuator has a movable portion (coil bobbin) movably supported by a base portion via a leaf spring. The objective lens is mounted on the movable part. A magnetic circuit including a magnet and a yoke is provided on the base. A focus drive coil and a tracking drive coil are attached to the movable part. When a drive current is supplied to the focus drive coil, the focus drive coil receives an electromagnetic force from the magnetic circuit and moves the movable portion in the optical axis direction (focus direction) of the objective lens.
Move to When a drive current is supplied to the tracking drive coil, the tracking drive coil receives an electromagnetic force from the magnetic circuit and moves the movable portion in a direction perpendicular to the optical axis of the objective lens and the recording track ( (Tracking direction).

In the optical recording medium, a light beam having passed through the objective lens is condensed and irradiated, so that an information signal is written and written at a position irradiated with the light beam.
Alternatively, reading is performed.

[0008] The luminous flux irradiated on the signal recording surface changes in light amount, in accordance with the information signal recorded on the signal recording surface.
Alternatively, the polarization direction is modulated, reflected by the signal recording surface, and returned to the objective lens.

The reflected light beam reflected by the signal recording surface passes through the objective lens and the beam splitter,
The light is received by the photodetector. The photodetector is a light receiving element such as a photodiode, receives the reflected light beam passing through the objective lens, and converts the light beam into an electric signal. The information signal recorded on the optical recording medium is reproduced based on the electric signal output from the photodetector.

A focus error signal indicating a distance between a focal point of the light beam by the objective lens and the signal recording surface in an optical axis direction of the objective lens based on an electric signal output from the photodetector; And a tracking error signal indicating a distance on the signal recording surface between the focus point and a recording track on the signal recording surface. The biaxial actuator is controlled based on the focus error signal and the tracking error signal, and moves the objective lens so that these error signals converge to zero.

Meanwhile, in such an optical recording medium, the recording density of information signals has been increased to be used as an auxiliary storage device for a computer and as a recording medium for audio and image signals. .

In order to write and read information signals on the optical recording medium having the increased recording density, the objective lens must have a larger numerical aperture (NA) and the light source must have a higher numerical aperture. It is necessary to shorten the light emission wavelength of the optical recording medium and reduce the beam spot formed by condensing the light beam on the optical recording medium.

However, when the numerical aperture of the objective lens increases, the inclination of the optical recording medium, the thickness unevenness of the transparent substrate of the optical recording medium, and the defocus (defocus) of the light beam on the optical recording medium. Is reduced, and it becomes difficult to write and read information signals to and from this optical recording medium.

For example, when an inclination (skew) of the optical recording medium with respect to the optical axis of the objective lens occurs, a wavefront aberration occurs in a light beam condensed on the signal recording surface,
The electric signal (RF output) output from the photodetector is affected.

The wavefront aberration is dominated by third-order coma which occurs in proportion to the cube of the numerical aperture of the objective lens and about the first power of the tilt angle (skew angle) of the optical recording medium. Therefore, the permissible value for the tilt of the optical recording medium is inversely proportional to the cube of the numerical aperture of the objective lens, that is, it decreases as the numerical aperture increases.

Thickness 1.2 mm, diameter 80 mm or 12
An optical disc (such as a so-called “compact disc”), which has a transparent substrate formed of a 0 mm disc-shaped polycarbonate and is a widely used optical recording medium at present, is ± 0.5. There may be an inclination of about 1 ° to ± 1 °.

In such an optical disk, the above-described wavefront aberration occurs in the light beam irradiated on the optical disk, the beam spot on the optical disk has an asymmetric shape, and intersymbol interference is remarkably generated, so that accurate signal reproduction is performed. Becomes difficult.

The amount of such third-order coma is proportional to the thickness of the transparent substrate of the optical disk. Therefore, by reducing the thickness of the transparent substrate (for example, to 0.6 mm), third-order coma can be reduced by half. When the coma aberration is to be reduced in this way, as the optical disk, a transparent substrate having a thickness of 1.2 mm and a transparent substrate having a thickness of 0.6 mm are used in combination. The Rukoto.

When a plane-parallel plate having a thickness t is inserted into the optical path of the convergent light beam condensed by the objective lens, t is related to the thickness t and the numerical aperture NA of the objective lens. × (NA) Spherical aberration proportional to ⁴ occurs.

The objective lens is designed to correct this spherical aberration. That is, since the amount of spherical aberration that occurs when the thickness of the transparent substrate varies, the objective lens is designed to be adapted to the predetermined thickness of the transparent substrate.

An optical disk having a transparent substrate having a thickness of 1.2 mm (for example, a "compact disk") is formed by using an objective lens designed and adapted to an optical disk having a transparent substrate having a thickness of 0.6 mm. When recording and reproducing information signals to and from a write-once optical disc and a magneto-optical disc, the difference in the thickness of these transparent substrates (0.6 mm) is due to the transparency that the optical pickup device can handle. This greatly exceeds the allowable range of the error in the thickness of the substrate. In this case, the objective lens cannot correct the spherical aberration generated due to the difference in the thickness of the transparent substrate, and cannot record and reproduce information signals satisfactorily.

Further, in a write-once optical disc (a so-called "CD-R") having a transparent substrate having a thickness of 1.2 mm, the wavelength dependency at the time of reading an information signal is high and the recording density of the information signal is high Information signals cannot be read using a light source whose emission wavelength has been shortened for the sake of realization.
That is, the signal recording layer of the so-called "CD-R" is formed of an organic dye-based material, and absorbs a light beam having a shortened wavelength, for example, a light beam having a wavelength of 635 nm to 650 nm, thereby reducing the reflectance. Since the light signal is reduced, the information signal cannot be read with such a light beam having a shorter wavelength.

Therefore, conventionally, a light source and an objective lens are
An optical pickup device provided with a number corresponding to the number of types of optical recording media (thickness of the transparent substrate) has been proposed.
That is, when trying to support two types of optical recording media, this optical pickup device supports a first objective lens on which a light beam emitted from a first semiconductor laser as a first light source is incident. It is provided with a first biaxial actuator and a second biaxial actuator that supports a second objective lens on which a light beam emitted from a second semiconductor laser as a second light source is incident. The semiconductor lasers and the biaxial actuators are arranged on the same frame. The first and second objective lenses have their optical axes parallel to each other.

The light beam emitted from the first semiconductor laser and the light beam emitted from the second semiconductor laser have different wavelengths from each other. Further, the first and second objective lenses have different numerical apertures.

The first and second biaxial actuators each have a movable portion (coil bobbin) movably supported. Each of the objective lenses is mounted on a movable portion of each of the biaxial actuators. Each of these biaxial actuators has a magnetic circuit.
A focus drive coil and a tracking drive coil are attached to each of the movable parts.
When a drive current is supplied to this focus drive coil,
The focus drive coil receives an electromagnetic force from the magnetic circuit and moves the movable section in the optical axis direction (focus direction) of each of the objective lenses. When a drive current is supplied to the tracking drive coil, the tracking drive coil receives an electromagnetic force from the magnetic circuit and moves the movable portion in a direction orthogonal to the optical axis of each objective lens and the recording track. (Tracking direction).

In a disc player device provided with this optical pickup device, a first type of optical disk having a thickness of the transparent substrate of, for example, 0.6 mm or a first type of optical disk having a thickness of the transparent substrate of, for example, 1.2 mm is provided. The two types of optical disks are held by a disk table having a central portion attached to a drive shaft of a spindle motor, and are rotated. The optical pickup device is supported by a guide shaft so as to be movable in the axial direction of the guide shaft. This optical pickup device
The disk is moved in the radial direction of the optical disk held on the disk table.

This optical pickup device turns on the first semiconductor laser when the optical disk of the first type is mounted on the disk table and turns the first semiconductor laser on.
The information signal is written to and read from the first type of optical disk through the objective lens of (1), and when the second type of optical disk is mounted on the disk table, the second semiconductor laser is turned on and the second semiconductor laser is turned on. An information signal is written to and read from the second type optical disk via the second objective lens.

The first and second biaxial actuators move the respective objective lenses in a focus direction which is an optical axis direction of the objective lenses and a tracking direction which is a direction parallel to the axial direction of the guide shaft. By doing so, these objective lenses follow the recording tracks on the optical disk.

[0029]

As described above, in an optical pickup device comprising two semiconductor lasers as light sources, two biaxial actuators, and two objective lenses, as described above, each of the biaxial actuators A focus drive current and a tracking drive current must be supplied to the focus drive coil and the tracking drive coil, respectively.

The supply of the drive current to the focus drive coil and the tracking drive coil is performed via a flexible substrate 115 as shown in FIG. This flexible board 115 has eight wiring patterns.

The first wiring pattern of the flexible board 115 is connected to the ground terminal of the first tracking drive coil (the tracking drive coil of the first biaxial actuator) 104 via the first terminal 114. . Further, the second wiring pattern of the flexible substrate 115 is connected to the current supply side terminal of the first tracking drive coil 104 via the second terminal 113.

The third wiring pattern of the flexible substrate 115 is connected to the ground terminal of the first focus driving coil (the focus driving coil of the first biaxial actuator) 103 via the third terminal 112. Is done. The fourth wiring pattern of the flexible substrate 115 is connected to a current supply terminal of the first focus driving coil 103 via a fourth terminal 111.

Further, the fifth wiring pattern of the flexible board 115 is connected to the ground terminal of the second tracking drive coil (the tracking drive coil of the second biaxial actuator) 106 via the fifth terminal 110. Is done. In addition, the sixth
The wiring pattern of the second
Is connected to the current supply side terminal of the tracking drive coil 106.

The seventh wiring pattern of the flexible board 115 is connected to a ground terminal of a second focus drive coil (focus drive coil of the second biaxial actuator) 105 via a seventh terminal 108. Is done. The eighth wiring pattern of the flexible substrate 115 is connected to the current supply terminal of the second focus drive coil 105 via the eighth terminal 107.

Since the flexible substrate has as many as eight wiring patterns, it is difficult to reduce its width, which hinders miniaturization of the optical pickup device. In an optical pickup device having three or more biaxial actuators, the flexible substrate has a wiring pattern having a number of wiring patterns in proportion to the number of the biaxial actuators, and has a wider width. This causes an increase in the size of the optical pickup device.

Therefore, the present invention has been proposed in view of the above-mentioned circumstances, and a plurality of optical signal recording / reproducing media having different thicknesses of transparent substrates are provided so that information signals can be written and read satisfactorily. An object of the present invention is to provide an optical pickup device including a light source and a plurality of objective lenses, wherein the size of the device is reduced.

Another object of the present invention is to solve the problem of providing a disk player device having the above-described optical pickup device according to the present invention and having a reduced size.

[0038]

In order to solve the above-mentioned problems, an optical pickup device according to the present invention comprises a light source and a plurality of light sources arranged with their optical axes parallel to each other and receiving a light beam emitted from the light source. And a plurality of objective lenses disposed corresponding to the plurality of objective lenses so that each of the objective lenses can be moved in a first direction parallel to an optical axis of the objective lens and in a second direction orthogonal to the optical axis. Support the objective lens to the first
A first drive coil for moving the object lens in the direction of the arrow, a second drive coil for moving the objective lens in the second direction, and a magnetic circuit for positioning each of the drive coils in a magnetic field. A plurality of biaxial actuators are provided, and each drive coil of each biaxial actuator has a ground terminal connected to each other.

Further, according to the present invention, in the optical pickup device, the first drive coils of the two-axis actuators are connected to the power supply side terminals, and the second drive coils of the two-axis actuators are connected to each other. Is that the power supply side terminals are connected to each other.

In order to solve the above-mentioned problems, a disk player apparatus according to the present invention is provided with a rotation operation mechanism for supporting and rotating an optical disk, a light source, and a light source which is disposed with the optical axis parallel to each other. A plurality of objective lenses for receiving the emitted light beam and condensing the light beam on a signal recording surface of an optical disk supported by the rotation operating mechanism; and A first lens for movably supporting the lens in a first direction parallel to the optical axis of the objective lens and in a second direction orthogonal to the optical axis, and for moving the objective lens in the first direction; A plurality of biaxial actuators having a drive coil, a second drive coil for moving and operating the objective lens in the second direction, and a magnetic circuit for positioning each drive coil in a magnetic field;
The type of the optical disk supported by the rotation operation mechanism is detected, and one of the plurality of biaxial actuators is selected according to the detected type, and the first and second drive coils of the selected biaxial actuator are selected. Control means for supplying a drive current to a power supply side terminal to condense a light beam having passed through an objective lens supported by the biaxial actuator onto a signal recording track of an optical disk supported by the rotation operating mechanism; Each drive coil of each biaxial actuator has a ground terminal connected to each other.

According to the present invention, in the disk player device, the first drive coils of the two-axis actuators are connected to a power supply side terminal, and the second drive coils of the two-axis actuators are connected to each other. Is that the power supply side terminals are connected to each other.

In the optical pickup device and the disc player device according to the present invention, the number of wires for each drive coil of each of the above-mentioned two-axis actuators is reduced, and the device configuration is downsized.

[0043]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below in the following order with reference to the drawings. [1] Type of optical recording medium [2] Support of optical pickup device [3] Configuration of biaxial actuator (objective lens driving device) [4] Plural optical paths [5] Configuration of disc player device

[1] Type of Optical Recording Medium In this embodiment, as shown in FIG. 4, an optical pickup device and a disc player device according to the present invention are provided in the form of a disc having a transparent substrate having a thickness of 0.6 mm. Irradiating a laser beam to both a first type optical disc 101 as an optical recording medium and a second type optical disc 102 as a disc-shaped optical recording medium having a transparent substrate thickness of 1.2 mm. And an optical pickup device and a disc player device for writing and reading information signals.

The optical disk 101 of the first type includes a disc-shaped polycarbonate substrate having a thickness of 0.6 mm and a diameter of 120 mm and a signal recording layer formed on one main surface of the transparent substrate. It is configured to have. The first type optical disc 101 is a disc body having a thickness of 1.2 mm, that is, a double-sided optical disc or a multi-layer optical disc, in which two first type optical discs 101 are bonded together on the signal recording layer side. Is composed.

This first type of optical disc 101 is
The laser beam having a wavelength of 635 nm (or 650 nm) is used to write and read information signals through an objective lens having a numerical aperture (NA) of 0.6. In the signal recording layer, the information signal is recorded along a substantially concentric spirally formed recording track.

As the optical disc 101 of the first type, for example, a so-called “digital
A "video disc (DVD)" (trade name) has been proposed.

The optical disk 102 of the second type includes a transparent substrate formed of a disc-shaped polycarbonate having a thickness of 1.2 mm, a diameter of 80 mm or 120 mm, and a signal recording layer formed on one main surface of the transparent substrate. And is configured.

The optical disk 102 of the second type is
The information signal is written and read by a laser beam having a wavelength of 780 nm through an objective lens having a numerical aperture of 0.45. In the signal recording layer, the information signal is recorded along a substantially concentric spirally formed recording track.

Examples of the optical disk 102 of the second type include a so-called “compact disk (CD)” (trade name) and a so-called “CD-R”.
OM "and" CD-R "have been proposed.

These first and second types of optical discs 101 and 102 are rotated by a spindle motor which is mounted on a chassis and constitutes a rotary operation mechanism in a disc player apparatus provided with an optical pickup device according to the present invention. . A disk table constituting a rotary operation mechanism is attached to a drive shaft of the spindle motor. This disk table is formed in a substantially disk shape, and has a substantially frustoconical projection at the center of the upper surface.

When the center portion of each of the optical disks 101 and 102 is placed on the disk table, the projection is fitted into a chucking hole provided in the center portion of each of the optical disks 101 and 102, and the optical disk 101 ,
It is configured to hold the central portion of 102. That is, the optical discs 101 and 102 are held at their center portions on the disc table, and are rotated together with the disc table by the spindle motor.

[2] Support of Optical Pickup Device As shown in FIG. 5, this optical pickup device has a frame 34. The frame 34 is movably supported by a guide shaft (not shown) provided on a chassis in a disc player device including the optical pickup device. The guide shaft is arranged parallel to the main surfaces of the optical disks 101 and 102 held on the disk table.

The frame 34 is moved along the guide shaft, so that the upper surface of the frame 34 has the optical disks 101 and 102 mounted on the disk table.
5 is moved in the direction of contact and separation with the spindle motor, that is, in the radial direction of the optical disks 101 and 102, as indicated by an arrow T in FIG. The frame 34 is moved by a sled motor provided on the chassis.

[3] Configuration of Biaxial Actuator (Object Lens Driving Device) By the way, the transparent substrates of the optical disks 101 and 102 are formed in a flat plate shape, but may have a slight distortion. When the part is rotated and held by the disk table, a so-called surface run-out occurs. That is, the signal recording layers of the optical discs 101 and 102 periodically move in the direction of approaching and separating from the optical pickup device when the optical discs 101 and 102 are rotated while their center portions are held. Also,
The recording tracks of the optical discs 101 and 102 are formed so that the center of curvature coincides with the center of the transparent substrate, but may have a slight eccentricity. When rotated,
The optical disks 101 and 102 move periodically in the radial direction.

The laser beam for writing and reading information signals to and from the optical discs 101 and 102 follows the movement of the recording tracks due to the surface deflection and eccentricity of the optical discs 101 and 102. As shown in FIGS. 4 and 5, the pickup device includes first and second biaxial actuators 14 and 1.
5 is provided. These two-axis actuators 14, 15
Is mounted on the upper surface of the frame 34.

The first biaxial actuator 14 moves the first objective lens 16 in the optical axis direction of the first objective lens 16 which is the first direction (that is, the focus direction indicated by the arrow F in FIG. 4). ) And a second direction, that is, a direction orthogonal to the optical axis (that is, a tracking direction indicated by an arrow T in FIG. 5). The first objective lens 16 has a numerical aperture of 0.6.

The second biaxial actuator 15
Indicates that the second objective lens 17 is moved in the first direction, that is, the optical axis direction of the second objective lens 17 (that is, the focus direction indicated by the arrow F in FIG. 4) and the second direction. (That is, a tracking direction indicated by an arrow T in FIG. 5). The second objective lens 17 has a numerical aperture of 0.45.

The objective lenses 16 and 17 correspond to the optical disks 101 and 102 mounted on the disk table.
5 and the frame 34 is moved along the guide shaft, as shown by the arrow T in FIG.
The moving operation is performed over the inner and outer peripheries of 1,102. The first
The second objective lenses 16 and 17 are arranged in a direction substantially perpendicular to the longitudinal direction of the guide shaft, that is, the optical disks 101 and 102 mounted on the disk table.
Are arranged in the circumferential direction. The first and second objective lenses 16 and 17 are supported with their optical axes parallel to each other.

The two-axis actuators 14 and 15 are
Each has base parts 23 and 31 fixedly arranged on the frame 34. These two-axis actuators 14 and 15 have coil bobbins 21 and 29 which are movable parts to which the objective lenses 16 and 17 are attached. The coil bobbins 21 and 29 are formed of a synthetic resin material to have a frame-like shape.
An objective lens mounting hole into which the objective lenses 16 and 17 are fitted is provided. In this objective lens mounting hole,
The objective lenses 16 and 17 are fitted and attached from above. The coil bobbins 21 and 29 have a pair of leaf spring members 24, 24, 3
It is supported by upper base parts 23 and 31 via 2 and 32.

The leaf spring members 24, 24, 32, 32
Is made of a metal material having appropriate elasticity such as phosphor bronze,
It is formed in a thin and elongated plate shape. These leaf spring members 2
4, 24, 32, 32 are substantially parallel to each other, and support the coil bobbins 21, 29 so as to be displaceable with respect to the bases 23, 31.

Each of the coil bobbins 21 and 29 is provided with a focus drive coil serving as a first drive coil for moving the objective lenses 16 and 17 in the focus direction and the objective lenses 16 and 17. A tracking drive coil serving as a second drive coil for performing the movement operation in the tracking direction is mounted. That is, as shown in FIG. 1, the first focus drive coil 1 and the first tracking drive coil 2 are attached to the coil bobbin 21 of the first biaxial actuator 14. Further, the second biaxial actuator 15
The second focus drive coil 3 and the second tracking drive coil 4 are attached to the coil bobbin 29.

Each of the focus drive coils 1 and 3 is wound around the side surface (outer peripheral portion) of the coil bobbins 21 and 29, and the center axis of the coil is set to the objective lenses 16 and 17.
Are parallel to the optical axis. Each of the tracking drive coils 2 and 4 is wound substantially in an annular shape and is attached to an end surface of the coil bobbin 21 or 29. The tracking drive coils 2 and 4 have the center axes of the coils parallel to the leaf spring members 24, 24, 32 and 32, and the center axes are orthogonal to the optical axes of the objective lenses 16 and 17. And

Then, on each of the base portions 23 and 31,
A magnetic circuit including magnets 22 and 30 and a yoke is provided. Each of the yokes is formed integrally with each of the bases 23 and 31 by a magnetic material (a high magnetic permeability material) such as iron. These yokes are respectively inserted into the hollow portions in the coil bobbins 21 and 29 from below, and are located near the tracking drive coils 2 and 4. The magnets 22 and 30 are attached to the front portions of the yokes by bonding using an adhesive.

In the first biaxial actuator 14, the first objective lens 16 is moved in the optical axis direction of the first objective lens 16, that is, in the focus direction indicated by an arrow F in FIG. An electromagnetic force generated between the first drive coils 1 and 2 and the magnet 22 is supported movably in two directions, that is, a tracking direction indicated by an arrow T in FIG. Is operated in the two directions.

The second biaxial actuator 15
In the above, the second objective lens 17 is arranged such that the direction of the optical axis of the second objective lens 17, that is, the focus direction indicated by an arrow F in FIG. 4 and the direction orthogonal to the optical axis, that is, FIG. 2 in the tracking direction indicated by the middle arrow T
In the direction described above.
Are moved in the two directions by the electromagnetic force generated between the drive coils 3 and 4 and the magnet 30.

As described above, the recording tracks are formed in the optical discs 101 and 102 in a substantially concentric spiral shape on the signal recording layer. In this optical disc, an information signal is written along the recording track. These biaxial actuators 14 and 15 move the objective lenses 16 and 17 to make the objective lenses 16 and 17 follow the displacement of the optical disks 101 and 102. That is, the optical pickup device always focuses the light flux transmitted through the objective lenses 16 and 17 at the position where the information signal is written on the signal recording layer of the optical disk.

This optical pickup device is opposed to the optical disks 101 and 102 held on the disk table in the chucking holes and rotated by the spindle motor.
By performing a moving operation in the radial direction of the optical disk 102, the information signal is written or read to or from the recording track while being moved along the recording track relative to the optical disks 101 and 102. .
Therefore, in this optical pickup device, the focus position of the laser beam by the objective lenses 16 and 17 must follow the displacement of the position of the recording track due to surface deflection and eccentricity of the optical disk. for that reason,
The biaxial actuators 14 and 15 move the objective lenses 16 and 17 in the focus direction and the tracking direction.

In these two-axis actuators 14 and 15, a focus drive current is supplied to each of the focus drive coils 1 and 3, so that the coil bobbins 21 and 29 move as shown by an arrow F in FIG. It is moved in the focus direction. In these two-axis actuators 14 and 15, a tracking drive current is supplied to each of the tracking drive coils 2 and 4, so that the coil bobbins 21 and 29 move to the arrow T in FIG.
As shown by, the moving operation is performed in the tracking direction.

In these two-axis actuators, the focus drive current and the tracking drive current are:
Error signals (focus error signal and tracking error signal) indicating the amount of deviation between the focus position of the laser beam by the objective lenses 16 and 17 and the recording track.
Supplied based on Therefore, these two-axis actuators 14 and 15 are connected to the optical disks 101 and 102.
The periodic movement operation is performed on the objective lenses 16 and 17 in synchronization with the rotation cycle of.

The drive current is supplied to the focus drive coils 1 and 3 and the tracking drive coils 2 and 4 through the first to sixth terminals to which the flexible substrate is connected, as shown in FIG. Done. The flexible substrate has six wiring patterns.

The first wiring pattern of the flexible board is connected to the current supply terminal of the first tracking drive coil 2 via the first terminal 10. Further, the second wiring pattern of the flexible substrate is connected to the current supply terminal of the first focus drive coil 1 via the second terminal 9.

The third wiring pattern of the flexible substrate is connected to the ground terminal of the first focus drive coil 1 and the ground terminal of the second focus drive coil 3 via the third terminal 8. Is done. That is, the first focus drive coil 1 and the second focus drive coil 3 have their ground terminals connected to each other.

The fourth wiring pattern of the flexible board is connected to the ground terminal of the first tracking drive coil 2 and the ground terminal of the second tracking drive coil 4 via the fourth terminal 7. Is done. That is, the first tracking drive coil 2 and the second tracking drive coil 4 have their ground terminals connected to each other.

The fifth wiring pattern of the flexible substrate is connected to the current supply terminal of the second focus drive coil 3 via the fifth terminal 6. Further, the sixth wiring pattern of the flexible substrate is connected to the current supply side terminal of the second tracking drive coil 4 via the sixth terminal 5.

In this optical pickup device, by supplying the first tracking drive current to the first terminal 10, the operation of moving the coil bobbin 21 in the tracking direction in the first biaxial actuator 14 is performed. It can be carried out. Further, in this optical pickup device, by supplying the first focus drive current to the second terminal 9, the operation of moving the coil bobbin 21 in the first biaxial actuator 14 in the focus direction is performed. be able to.

In this optical pickup device, by supplying a second focus drive current to the fifth terminal 6, the second biaxial actuator 1
5, the operation of moving the coil bobbin 29 in the focus direction can be performed. Further, in this optical pickup device, by supplying the second tracking drive current to the sixth terminal 5, the coil bobbin 29 in the second biaxial actuator 15 is supplied.
Can be moved in the tracking direction.

In this optical pickup device, as shown in FIG. 2, the ground terminals of the focus driving coils 1 and 3 and the ground terminals of the tracking coils 2 and 4 are connected to each other. Is also good. In this case, a flexible substrate having five wiring patterns can be used.

That is, the first wiring pattern of the flexible board is connected to the current supply terminal of the first tracking drive coil 2 via the first terminal 10. Further, the second wiring pattern of the flexible substrate is connected to the current supply terminal of the first focus drive coil 1 via the second terminal 9.

The third wiring pattern of the flexible board is connected to the ground terminal of the first focus drive coil 1, the ground terminal of the second focus drive coil 3, It is connected to the ground terminal of the first tracking drive coil 2 and the ground terminal of the second tracking drive coil 4.

The fourth wiring pattern of the flexible substrate is connected to the current supply terminal of the second focus drive coil 3 via the fourth terminal 6. Also,
The fifth wiring pattern of the flexible substrate is connected to the current supply terminal of the second tracking drive coil 4 via the fifth terminal 5.

In this optical pickup device, by supplying a first tracking drive current to the first terminal 10, the operation of moving the coil bobbin 21 in the tracking direction in the first biaxial actuator 14 is performed. It can be carried out. Further, in this optical pickup device, by supplying the first focus drive current to the second terminal 9, the operation of moving the coil bobbin 21 in the first biaxial actuator 14 in the focus direction is performed. be able to.

In this optical pickup device, the second focus driving current is supplied to the fourth terminal 6 so that the second biaxial actuator 1
5, the operation of moving the coil bobbin 29 in the focus direction can be performed. Further, in this optical pickup device, by supplying the second tracking drive current to the fifth terminal 5, the coil bobbin 29 in the second biaxial actuator 15 is supplied.
Can be moved in the tracking direction.

Further, in this optical pickup device, as shown in FIG. 3, the ground terminals of the focus driving coils 1 and 3 and the tracking coils 2 and
4 are connected to each other, the power supply terminals of the focus drive coils 1 and 3 are connected to each other, and the tracking drive coils 2 and 4 are further connected.
May be connected to each other. In this case, a flexible substrate having three wiring patterns can be used.

That is, the first wiring pattern of the flexible substrate is connected to the current supply side terminal of the first tracking drive coil 2 and the second
Is connected to the current supply side terminal of the tracking drive coil 4.

The second wiring pattern of the flexible substrate is connected to the ground terminal of the first focus drive coil 1, the ground terminal of the second focus drive coil 3, It is connected to the ground terminal of the first tracking drive coil 2 and the ground terminal of the second tracking drive coil 4.

The third wiring pattern of the flexible substrate is connected to the current supply terminal of the second focus drive coil 3 and the current supply side of the second tracking drive coil 4 via the third terminal 12. Connected to terminal.

In this optical pickup device, by supplying the first or second tracking drive current to the first terminal 10, the coil bobbin 2 of the first and second biaxial actuators 14 and 15 is supplied.
It is possible to perform the movement operation in the tracking direction of 1,29. Further, in this optical pickup device, the first or second focus drive current is supplied to the third terminal 12 so that the coil bobbins 21 and 29 in the first and second biaxial actuators 14 and 15 are provided. Can be performed in the focus direction.

That is, in this case, in the first and second biaxial actuators 14 and 15, the respective coil bobbins 21 and 29 perform the same moving operation. However, as described later, since the first and second biaxial actuators 14 and 15 are not used at the same time, the respective coil bobbins 21 and 29 perform the same movement operation as described above. This does not hinder the writing and reading of information signals to and from the optical discs 101 and 102.

As described above, in the optical pickup device and the disc player device provided with the optical pickup device, the two-axis actuators 14 and 15 are used.
Since the number of wires for each of the drive coils 1, 2, 3, and 4 is reduced, and the width of the flexible substrate can be reduced, the size of the device can be reduced.

The laser beam condensed on the signal recording layer by the first or second objective lens 16 or 17 is written on the signal recording layer in the signal recording layer. The reflected light or the polarization direction is modulated according to the information signal and reflected. The light beams reflected by the signal recording layer return to the objective lenses 16 and 17, respectively, and pass through the objective lenses 16 and 17 and, as described later, photodetectors 25 and 33 disposed in the frame 34. Is received by the This photodetector 2
Reference numerals 5 and 33 each include a plurality of photodetectors. From the output signals from the photodetectors 25 and 33, a read signal of the information signal from the optical discs 101 and 102, the focus error signal and the tracking error signal are generated.

[4] Plurality of Optical Paths As shown in FIGS. 4, 5 and 6, in the frame 34, a first semiconductor laser 18 serving as a first light source and a second semiconductor light source serving as a second light source are provided. Semiconductor laser 26 is built-in. The first semiconductor laser 18 and the second semiconductor laser 26 emit first and second laser beams, respectively, which are linearly polarized coherent lights. These laser beams are divergent beams. The wavelength of the first laser beam emitted from the first semiconductor laser 18 is 635 nm or 650 nm, which is the first wavelength. The wavelength of the second laser beam emitted from the second semiconductor laser 26 is 780 nm, which is the second wavelength.

In the frame 34, the first semiconductor laser 18 constitutes a first light source block 35 as shown in FIG. That is, the first laser beam emitted from the first semiconductor laser 18 is incident on the first beam splitter 19 having a flat plate shape. This first
The beam splitter 19 is arranged such that the main surface is at an angle of 45 ° with respect to the optical axis of the first laser beam. The first beam splitter 19 transmits part of the first laser beam and reflects the rest. This first
The first laser light flux reflected by the beam splitter 19 is reflected by the first reflection mirror 20 and passes through a first through hole provided on the upper surface of the frame 34, and is outside the frame 34. It is injected to one side. And
The first laser beam is incident on the first objective lens 16. The first objective lens 16 focuses the first laser beam on the signal recording layer of the first type optical disc 101.

In the frame 34, the second semiconductor laser 26 constitutes a second light source block 36 as shown in FIG. That is, this second
The second laser beam emitted from the semiconductor laser 26 is incident on a plate-shaped second beam splitter 27.
The second beam splitter 27 has a main surface portion that is the second beam splitter 27.
Are arranged at an angle of 45 ° with respect to the optical axis of the laser beam. The second beam splitter 27 transmits a part of the second laser beam and reflects the remaining part.
The second beam reflected by the second beam splitter 27
Is reflected by the second reflection mirror 28 and is emitted to the outside of the frame 34 through the second through hole provided in the upper surface of the frame 34. Then, the second laser beam is incident on the second objective lens 17. The second objective lens 17 transmits the second laser beam to the second type optical disc 102.
Is focused on the signal recording layer.

[5] Configuration of Disc Player Apparatus In the above disc player apparatus, as shown in FIG. 6, a drive circuit serving as control means for detecting and determining the type of the optical disk mounted on the disk table. 39 are provided. This drive circuit 39
Each of the above semiconductor lasers 1 according to various signals to be sent.
8, 26, and controls the two-axis actuators 14, 15, the spindle motor and the sled motor.

That is, the drive circuit 39 controls turning on and off of the semiconductor lasers 18 and 26. Further, a signal obtained through the first two-axis actuator 14 is sent to the drive circuit 39 via the first error detection circuit 37, and a signal obtained through the second two-axis actuator 15 is sent to the drive circuit 39. Is sent through the second error detection circuit 38. The drive circuit 39 supplies the drive currents to the biaxial actuators 14 and 15 via the flexible substrate 40.

When the drive circuit 39 determines that the first type of optical disk 101 is mounted on the disk table, the drive circuit 39 selects the first biaxial actuator 14, and selects the first biaxial actuator 14. The drive current to be supplied to each of the drive coils 1 and 2 of the first two-axis actuator 14 is supplied to the first two-axis actuator 14 or the first
To the second biaxial actuator 14 and the second biaxial actuator 15. The first type optical disk 101 is mounted on the disk table.
Is determined by detecting the thickness of the transparent substrate of the optical disk mounted on the disk table.

When it is determined that the first type of optical disk 101 is mounted on the disk table, the drive circuit 39 determines whether the first type of optical disk 101 is mounted on the disk table.
The second semiconductor laser 26 is turned off, and the second semiconductor laser 26 is turned off. At this time, the first laser beam that has passed through the first objective lens 16 is irradiated onto the first type optical disc 101 from the transparent substrate side of the first type optical disc 101 and passes through the transparent substrate. Thus, the light is focused on the signal recording layer. The first objective lens 16
The first two-axis actuator 14
The objective lens 16 is moved in the optical axis direction and in a direction orthogonal to the optical axis. The first objective lens 16 is moved by the first biaxial actuator 14 following the displacement of the first type optical disc 101 in the direction of the optical axis of the first objective lens 16 (so-called surface deflection). By being operated, the focal point of the laser beam is always located on the signal recording layer. Also, the first objective lens 1
6 is moved by the first biaxial actuator 14 following the displacement of the recording track of the first type optical disc 101 in the direction orthogonal to the optical axis of the first objective lens 16. The focal point of the first laser beam is always positioned on the recording track.

This optical pickup device converges and irradiates the first laser beam onto the signal recording layer of the first type optical disc 101 to write and read information signals to and from this signal recording layer. Do. In writing the information signal, when the first type optical disk 101 is a magneto-optical disk, the magneto-optical disk is irradiated with the first laser beam and the first laser beam is An external magnetic field is applied to the irradiation position. By modulating either the optical output of the first laser beam or the intensity of the external magnetic field according to the information signal to be recorded, the information signal is written to the magneto-optical disk. When the first type optical disk 101 is a phase change type disk,
By modulating the optical output of the first laser beam according to the information signal to be recorded, the information signal is written to the phase change disk.

In this optical pickup device, the first laser beam is condensed and irradiated onto the signal recording layer of the first type optical disc 101, and the laser beam reflected by the signal recording layer is reflected by the first laser beam. , The information signal is read from the signal recording layer.

In the reading of the information signal, if the first type optical disk 101 is a magneto-optical disk, a change in the polarization direction of the reflected light beam is detected to detect the information signal from the magneto-optical disk. Reading is performed. When the first type of optical disk 101 is a phase change disk or a so-called pit disk, a change in the amount of reflected light of the reflected light beam is detected to detect an information signal from the phase change disk. Reading is performed.

That is, the first laser beam condensed on the signal recording layer is reflected by the signal recording layer, and returns to the first objective lens 16 as a reflected beam. The reflected light flux returning to the first objective lens 16 is transmitted to the first objective lens 16 and the first reflection mirror 20.
, And returns to the first beam splitter 19. The reflected light flux returning to the first beam splitter 19 passes through the first beam splitter 19 and is branched to an optical path returning to the first semiconductor laser 18, and the first light detector 25 Head for.

Then, the first error detection circuit 37
Is based on the output signal from the first photodetector 25,
A focus error signal and a tracking error signal for the first biaxial actuator 14 are generated.

Since the first beam splitter 19 is a parallel flat plate inclined at an angle of 45 ° with respect to the optical axis of the reflected light beam, it generates astigmatism in the reflected light beam. By detecting the direction and amount of the astigmatism, a focus error signal is generated. The focus error signal is transmitted to the first objective lens 16 between the focal point of the first laser beam by the first objective lens 16 and the surface of the signal recording layer of the first type optical disc 101. This is a signal indicating the amount and direction of displacement in the optical axis direction. Further, a tracking error signal is generated based on the detection output of the first photodetector 25. The tracking error signal is transmitted to the first objective lens 1 between the focal point of the first laser beam by the first objective lens 16 and the recording track of the first type optical disc 101.
6 is a signal indicating the amount and direction of the displacement in the direction orthogonal to the optical axis of No. 6. The first biaxial actuator 14 is driven based on a focus error signal and a tracking error signal generated by the first error detection circuit 37.

When the optical disk 101 of the first type is a magneto-optical disk, the reflected light beam having passed through the first beam splitter 19 passes through a Wollaston prism and passes through the first photodetector 25. Incident on. The Wollaston prism converts the reflected light beam into a first polarized light component that is polarized in the polarization direction of the reflected light beam and a second polarized light beam that is polarized in a direction of + 45 ° with respect to the polarization direction of the reflected light beam.
And -45 with respect to the polarization direction of the reflected light beam.
The light is split into three light fluxes with a third polarized light component that is polarized in the direction of °.

In this case, the first photodetector 25
Has a plurality of photodiodes corresponding to the plurality of light beams branched by the Wollaston prism, and each of the light beams is received by the corresponding photodiode. By arithmetically processing the light detection output from each photodiode of the first photodetector 25, a read signal of the information signal recorded on the magneto-optical disk is generated.

The optical pickup device is moved along the guide shaft, whereby
When the first objective lens 16 is moved to oppose the entire area of the signal recording area of the first type optical disc 101, writing and reading of an information signal are performed for the entire area of the signal recording area. It can be carried out. That is, the optical pickup device is provided with the first
The first type of optical disc 101 is rotated by operating the first type of optical disc 101 while moving the inner and outer circumferences of the first type of optical disc 101.
The information signal can be written and read for the entire signal recording area.

When it is determined that the second type of optical disk 102 is mounted on the disk table, the drive circuit 39 selects the second biaxial actuator 15. The drive current to be supplied to the drive coils 3 and 4 of the second biaxial actuator 15 is supplied to the second biaxial actuator 15 or the second biaxial actuator 15 and the first biaxial actuator. It is supplied to the actuator 14. The determination that the second type of optical disk 102 is mounted on the disk table is performed by detecting the thickness of the transparent substrate of the optical disk mounted on the disk table.

When it is determined that the optical disk 102 of the second type is mounted on the disk table, the drive circuit 39 outputs
The first semiconductor laser 18 is turned off, and the first semiconductor laser 18 is turned off. At this time, the second laser beam that has passed through the second objective lens 17 is irradiated onto the second type optical disc 102 from the transparent substrate side of the second type optical disc 102 and passes through the transparent substrate. Thus, the light is focused on the signal recording layer. The second objective lens 17
Is controlled by the second biaxial actuator 15.
The objective lens 17 is moved in the optical axis direction and in a direction perpendicular to the optical axis. The second objective lens 17 is moved by the second biaxial actuator 15 following the displacement of the second type of optical disc 102 in the optical axis direction of the second objective lens 17 (so-called surface deflection). By being operated, the focal point of the laser beam is always located on the signal recording layer. Further, the second objective lens 1
7 is moved by the second biaxial actuator 15 by following the displacement of the recording track of the second type optical disc 102 in the direction orthogonal to the optical axis of the second objective lens 17. The focal point of the second laser beam is always positioned on the recording track.

This optical pickup device converges and irradiates the second laser beam onto the signal recording layer of the second type optical disc 102, thereby writing and reading information signals to and from this signal recording layer. Do. When writing the information signal, if the second type optical disk 102 is a magneto-optical disk, the magneto-optical disk is irradiated with the second laser beam and the second laser beam is irradiated with the second laser beam. An external magnetic field is applied to the irradiation position. By modulating either the optical output of the second laser beam or the intensity of the external magnetic field according to the information signal to be recorded, the information signal is written to the magneto-optical disk. When the second type optical disk 102 is a phase change type disk,
By modulating the optical output of the second laser beam according to the information signal to be recorded, the information signal is written to the phase change disk.

In the optical pickup device, the second laser beam is condensed and irradiated onto the signal recording layer of the second type optical disc 102, and the laser beam reflected by the signal recording layer is reflected by the second laser beam. , The information signal is read from the signal recording layer.

In the reading of the information signal, when the second type optical disk 102 is a magneto-optical disk, the change in the polarization direction of the reflected light beam is detected to detect the information signal from the magneto-optical disk. Reading is performed. Further, when the second type optical disk 102 is a phase change disk or a so-called pit disk, a change in the amount of reflected light of the reflected light beam is detected to detect an information signal from the phase change disk. Reading is performed.

That is, the second laser beam condensed on the signal recording layer is reflected by the signal recording layer and returns to the second objective lens 17 as a reflected beam. The reflected light flux returned to the second objective lens 17 is transmitted to the second objective lens 17 and the second reflection mirror 28.
, And returns to the second beam splitter 27. The reflected light flux returning to the second beam splitter 27 is transmitted through the second beam splitter 27, is branched to the optical path returning to the second semiconductor laser 26, and is split into a second photodetector 33. Head for.

The second error detection circuit 38
Is based on the output signal from the second photodetector 33,
A focus error signal and a tracking error signal for the second biaxial actuator 15 are generated.

Since the second beam splitter 2 is a parallel flat plate inclined at an angle of 45 ° with respect to the optical axis of the reflected light beam, it generates astigmatism in the reflected light beam. By detecting the direction and amount of the astigmatism, a focus error signal is generated. The focus error signal is transmitted between the focal point of the second laser beam by the second objective lens 17 and the surface of the signal recording layer of the second type optical disc 102. This is a signal indicating the amount and direction of displacement in the optical axis direction. Further, a tracking error signal is generated based on the detection output of the second photodetector 33. The tracking error signal is transmitted to the second objective lens 1 between the focal point of the second laser beam by the second objective lens 17 and the recording track of the second type optical disc 102.
7 is a signal indicating the amount and direction of the positional shift in the direction orthogonal to the optical axis of No. 7. The second biaxial actuator 15 is driven based on a focus error signal and a tracking error signal generated by the second error detection circuit 38.

Further, the optical pickup device is moved along the guide shaft, whereby
When the second objective lens 17 is moved so as to face the entire signal recording area of the second type optical disc 102, writing and reading of an information signal are performed for the entire signal recording area. It can be carried out. That is, this optical pickup device is
The second type of optical disc 102 is rotated by the moving operation over the inner and outer peripheries of the type of optical disc 102, and the second type of optical disc 102 is rotated.
The information signal can be written and read for the entire signal recording area.

In this disk player device, the optical disk 1 mounted on the disk table
The detection of the thickness of the transparent substrate for detecting the type of 01 and 102 can be performed by the drive circuit 39 based on the amplitude of the RF signal read from the optical disks 101 and 102. That is, the first type and the second type
When any of the optical disks 101 and 102 is mounted on the disk table, one of the first and second semiconductor lasers 18 and 26 emits light. At this time, if only the focus servo is operated for the biaxial actuator corresponding to the emitted semiconductor laser, the amplitude of the RF signal can be detected and the first and second semiconductors emit light. The first and second types of optical discs 101 and 102 are mounted on the disc table based on which of the lasers 18 and 26 and the amplitude of the detected RF signal. Can be determined.

In this disk player device, the optical disk 1 mounted on the disk table
The detection of the thickness of the transparent substrate for detecting the types 01 and 102 may be performed by an optical sensor in which a light emitting element such as an LED and a light receiving element such as a photodiode are combined. That is, in this optical sensor, the difference in the optical path of the reflected light due to the difference in the thickness of the transparent substrate of the optical discs 101 and 102 when the light emitted from the light emitting element is applied to the optical discs 101 and 102 and reflected is considered. By detecting with the light receiving element, a difference in the thickness of the transparent substrate can be detected.

In the optical pickup device and the disc player device according to the present invention, three or more objective lenses and two or more biaxial actuators may be provided. In the optical pickup device and the disc player device according to the present invention, the number of the light sources is one, and the light path of the light beam emitted from the light source is selectively deflected, so that the light beam is selectively applied to each of the objective lenses. May be incident. Further, in the optical pickup device and the disc player device according to the present invention, the number of the light sources is one, and the optical path of the light beam emitted from the light source is branched into a plurality of light beams. May be made incident simultaneously.

[0120]

As described above, in the optical pickup device according to the present invention, corresponding to a plurality of objective lenses,
Each of the objective lenses is moved in a first direction (focus direction).
A first drive coil for moving the object lens in the second direction, a second drive coil for moving the objective lens in the second direction (tracking direction), and a magnetic circuit for positioning each drive coil in a magnetic field. Are provided. Each drive coil of these two-axis actuators has a ground terminal connected to each other.

Therefore, in the optical pickup device and the disc player device provided with the optical pickup device, the number of wires for each drive coil of each of the biaxial actuators can be reduced, and the size of the device can be reduced. Can be.

That is, the present invention relates to an optical pickup device provided with a plurality of light sources and a plurality of objective lenses so that an information signal can be written and read to and from an optical recording medium having a transparent substrate having a different thickness. It is possible to reduce the size of the device configuration.

Further, the present invention can provide a disc player device having a compact device structure by including the optical pickup device according to the present invention.

[Brief description of the drawings]

FIG. 1 is a wiring diagram showing wiring for a drive coil of a biaxial actuator in an optical pickup device according to the present invention and a disc player device according to the present invention.

FIG. 2 is a wiring diagram showing another example of wiring for a drive coil of a biaxial actuator in the optical pickup device and the disc player device.

FIG. 3 is a wiring diagram showing still another example of wiring for a drive coil of a biaxial actuator in the optical pickup device and the disc player device.

FIG. 4 is a side view showing the configuration of the optical pickup device according to the present invention in the disc player device according to the present invention.

FIG. 5 is a plan view showing a configuration of the optical pickup device.

FIG. 6 is a block diagram showing a configuration of the disc player device.

FIG. 7 is a wiring diagram showing wiring for a drive coil of a biaxial actuator in a conventional optical pickup device.

[Explanation of symbols]

1 first focus drive coil, 2 first tracking drive coil, 3 second focus drive coil, 4
Second tracking drive coil, 14 first biaxial actuator, 15 second biaxial actuator, 16
1st objective lens, 17 2nd objective lens, 18 1st semiconductor laser, 26 2nd semiconductor laser, 40
Flexible substrate, 101 Optical disk of the first type, 1
02 Second type optical disc

Claims (4)

[Claims] 1. A light source, a plurality of objective lenses disposed with their optical axes parallel to each other and receiving a light beam emitted from the light source, and a plurality of objective lenses disposed corresponding to the plurality of objective lenses, respectively. A lens for movably supporting a lens in a first direction parallel to the optical axis of the objective lens and a second direction orthogonal to the optical axis, and for moving the objective lens in the first direction, respectively. A single drive coil, a second drive coil for moving the objective lens in the second direction, and a plurality of biaxial actuators having a magnetic circuit for positioning each drive coil in a magnetic field. An optical pickup device in which each drive coil of each biaxial actuator has ground terminals connected to each other. 2. A first drive coil of each biaxial actuator is connected to a power supply terminal, and a second drive coil of each biaxial actuator is connected to each other.
2. The optical pickup device according to claim 1, wherein the power supply terminals are connected to each other. 3. A rotation operation mechanism for supporting and rotating an optical disc, a light source, and a light source provided with the optical axis parallel to each other, receiving a light beam emitted from the light source, and supporting the light beam on the rotation operation mechanism. A plurality of objective lenses for converging on the signal recording surface of the optical disc, and a plurality of objective lenses arranged corresponding to the plurality of objective lenses, each of the objective lenses having a first direction parallel to an optical axis of the objective lens; A first drive coil for movably supporting the objective lens in the first direction, the first drive coil for moving and operating the objective lens in the first direction, and moving the objective lens in the second direction. A plurality of biaxial actuators having a second drive coil for operating and a magnetic circuit for positioning each drive coil in a magnetic field; and detecting a type of an optical disc supported by the rotary operation mechanism. One of the plurality of biaxial actuators is selected according to the type, and a drive current is supplied to the power supply side terminals of the first and second drive coils of the selected biaxial actuator to thereby control the biaxial actuator. Control means for condensing a light beam having passed through the objective lens supported by the rotary operating mechanism onto a signal recording track of an optical disk supported by the rotation operation mechanism, and each drive coil of each of the biaxial actuators has a ground terminal connected to each other. Disc player device that has been made. 4. A first drive coil of each biaxial actuator is connected to a power supply side terminal, and a second drive coil of each biaxial actuator is connected to each other.
4. The disc player according to claim 3, wherein the power supply terminals are connected to each other.