JP2000331388A - Optical pickup, optical disk device, and magnetic field modulation head device used for the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the generation of noise caused by a head driving current, and to reduce a development cost and product cost regarding a head driving circuit. SOLUTION: This head device 15 includes a magnetic head element 31 for recording an information signal in the magneto-optical recording layer of a magneto-optical disk 11, a slider for holding the magnetic head element 31 at a fixed gap to the surface of the mageto-optical disk 11, a head supporting member 32, with the magnetic head element 31 being attached to one end thereof, and the other end being supported on a fixed part 33 so as to be swung, and a wiring part, with one end thereof being connected to the magnetic head element 31 and the other end being disposed in the fixed part 33. The fixed part 33 is attached on the base of an optical pickup 13. In the midway or the end of the wiring part, a head driving circuit 15a for driving the magnetic head element 31 is provided.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical pickup and an optical disk device for recording or reproducing a signal of a magneto-optical disk, and a magnetic field modulation head device used for the optical pickup and the optical disk device.

[0002]

2. Description of the Related Art Conventionally, an optical disk device is used for a magneto-optical recording medium such as a magneto-optical disk in which a magneto-optical recording layer composed of a perpendicular magnetization film is provided on a transparent disk substrate having optical transparency. Recording and reproduction of information signals are performed. Such an optical disk device includes, for example, a rotational drive unit such as a spindle motor for rotationally driving a magneto-optical disk, and an objective lens from a light source to a magneto-optical recording layer on one surface side of the rotating magneto-optical disk. An optical pickup that irradiates a light beam through an optical system and detects return light from the magneto-optical recording layer of the optical disk by a photodetector through the optical system, and a magneto-optical device on the other surface side of the magneto-optical disk A magnetic field modulation head device that applies an external magnetic field based on an information signal to be recorded on the recording layer, and a biaxial actuator that supports the objective lens so as to be movable in two axial directions, that is, a focus direction and a tracking direction. I have.

[0003] In the optical disk device configured as described above, a magnetic field modulation head device applies a magnetic field whose direction is modulated in accordance with an information signal to be recorded to a rotating magneto-optical disk. The light beam emitted from the optical pickup is condensed and irradiated. Thereby, by the irradiation of the light beam, the portion of the magneto-optical recording layer that has lost the coercive force by being heated to the Curie temperature or higher is magnetized according to the direction of the magnetic field applied by the magnetic field modulation head device, The rotation of the magneto-optical disk causes the light beam to move relatively from the above portion. Therefore, when the temperature of the portion becomes equal to or lower than the Curie temperature, the direction of the magnetization is fixed, and the magnetic recording of the information signal is performed.

By the way, in the optical disk device having such a configuration, at the time of recording the information signal, the magnetic head element of the magnetic field modulation head device is kept in contact with the rotatable magneto-optical disk at a fixed interval. To face each other. This is to prevent the core of a magnetic material such as ferrite constituting the magnetic head element from directly sliding on the magneto-optical disk, thereby preventing the magneto-optical disk from being damaged.

Therefore, in the conventional magnetic field modulation head device, even if surface contact occurs when the magneto-optical disk is rotationally driven due to warpage or unevenness of the thickness of the magneto-optical disk, the magnetic field modulation head device has a magnetic field modulation head device. An electromagnetic control mechanism for displacing the magnetic head element following the surface contact of the magneto-optical disk is provided so that the head element can maintain a constant interval without contacting the surface of the magneto-optical disk.

In a magnetic field modulation head device having such an electromagnetic control mechanism, electric power for driving the electromagnetic control mechanism is required, which increases power consumption and
Since a detection mechanism for detecting the interval between the magnetic head element and the magneto-optical disk is also required, not only does the mechanism for controlling the magnetic field modulation head device become complicated,
The optical disc device itself has a complicated configuration, and it is difficult to reduce the size and thickness of the entire device.

For this reason, instead of the magnetic field modulation head device which holds the magnetic head elements of the magnetic field modulation head device at fixed intervals by an electromagnetic control mechanism, a magneto-optical disk which can generate surface contact due to rotational driving is replaced with a magneto-optical disk. There has been proposed an optical disk device provided with a magnetic field modulation head device, which records an information signal while a magnetic head element is in sliding contact with a disk.

[0008] Such a magnetic field modulation head device is configured, for example, as shown in FIG. 7, a magnetic field modulation head device 1 includes a magnetic head element 2 including a bobbin to which a magnetic core and a coil (not shown) are attached.
Are supported by the tip of the head support member 3. The other end of the head support member 3 is swingably supported by the fixed portion 1a.

The magnetic head element 2 has a slider (not shown) on the lower surface side facing the magneto-optical disk 4. Thus, the magnetic head element 2 is held at a constant interval on the surface of the magneto-optical disk 4 by sliding the slider on the surface of the magneto-optical disk 4 which is rotationally driven.

An optical pickup 6 is provided below the magneto-optical disk 4 on the side opposite to the magnetic head element 2. The optical pickup 6 emits a light beam from a light source (not shown) to a position on the opposite side of the magneto-optical disk 4 from the magnetic head element 2.
It is slidably supported along the main shaft 6a and the sub shaft 6b. As a result, the optical pickup 6 is sought in the radial direction of the magneto-optical disk 4 by a seek mechanism (not shown) to access a desired track position on the magneto-optical disk 4. Further, on the base 6c of the optical pickup 6, the fixed portion 1a of the magnetic field modulation head device 1 is mounted.
In the above-described seek operation, the magnetic field modulation head device 1 also performs a seek operation.

[0011]

By the way, in the magnetic field modulation head device 1, the connector 7b provided on the main substrate 7a of the optical disk device 7 is connected to the fixed portion 1a via a dedicated flexible printed board 8. Are connected to each other, and a lead wire (not shown) is routed along the head support member 3 so that wiring to the magnetic head element 2 is performed. On the other hand, the wiring to the optical pickup 6 is similarly connected from the connector 7c provided on the main board 7a of the optical disc device 7 to the base 6c via the dedicated flexible printed board 9. It has become. A head drive circuit 2a for driving the magnetic head element 2 of the magnetic field modulation head device 1 is provided on the main substrate 7a.

The head drive circuit 2a supplies a large current to the magnetic head element 2 by controlling a drive current supplied from, for example, a power supply with a control signal using a switching element such as an FET. Is configured. For this reason, the head drive circuit 2a itself determines and sets circuit constants in consideration of the current characteristics of the magnetic head element 2 of the magnetic field modulation head device 1. Correspondingly, it is necessary to prepare a main substrate 7a having a head drive circuit 2a designed in each case, which leads to an increase in development cost, a reduction in mass production effect, and an increase in product cost. there were.

The driving current flowing from the head drive circuit 2a to the magnetic head element 2 of the magnetic field modulation head device 1 through the flexible printed circuit board 9 is relatively large, and since the path is long, noise is generated. Happened
There is a problem that the leakage occurs outside the optical disk device.

In view of the above, the present invention reduces the generation of noise due to a head drive current and reduces the development cost and product cost of a head drive circuit, and an optical pickup, an optical disk device and a use thereof. It is an object of the present invention to provide a magnetic field modulation head device to be used.

[0015]

According to the first aspect of the present invention, there is provided a magnetic head element for recording an information signal on a magneto-optical recording layer of a magneto-optical disk, and the magnetic head element includes one end. A head support member that is mounted on the other end and is swingably supported with respect to the fixed portion, and a wiring portion that is connected to the magnetic head element at one end and the other end is disposed at the fixed portion. A magnetic field modulation head device, wherein the fixed portion is mounted on a base of an optical pickup, and a head drive circuit for driving a magnetic head element is provided in the middle or at an end of the wiring portion. Is done.

According to the first aspect of the present invention, a head drive circuit for driving the magnetic head element is provided in the middle or at the end of the wiring portion of the magnetic field modulation head device, that is, at any portion of the wiring portion. Therefore, the drive current from the head drive circuit, which is a relatively large current, only flows through a short wiring path from the fixed portion of the magnetic field modulation head device to the magnetic head element along the head support member. Only the control signal flows from the main substrate to the head drive circuit. Therefore, the path of the drive current flowing from the head drive circuit to the magnetic head element is shortened.

In this case, since the head drive circuit is provided in the magnetic field modulation head device having the magnetic head element, it is designed exclusively for a specific type of magnetic head element, and Since the main board of the apparatus only needs to output a control signal to the head drive circuit, the design of the main board can be general-purpose.

According to a third aspect of the present invention, a head drive circuit is provided on the base of the optical pickup, and the other end of the wiring portion of the magnetic field modulation head device is connected to the base of the optical pickup. And a power distribution unit for electrically connecting the power supply unit to the power supply unit.

According to the third aspect of the present invention, a head drive circuit for driving the magnetic head element is provided on the base of the optical pickup, and is connected to the other end of the wiring section of the magnetic field modulation head device. Since the power distribution means for electrically connecting the connection portion on the base of the optical pickup is provided, the drive current from the head drive circuit, which is a relatively large current, is supplied from the head drive circuit on the base of the optical pickup. It only flows through a relatively short path from the main board of the optical disc device to the base of the optical pickup from the main substrate of the optical disc device by flowing through a relatively short path from the power distribution means to the fixed portion of the magnetic field modulation head device and along the head support member. Only the control signal flows to the circuit.

Since the power distribution means connects between the magnetic field modulation head device and the base of the optical pickup which are moved together during the seek operation, it is not necessary to absorb the seek operation. Since the minimum length is sufficient, the path of the drive current is shorter. Therefore, the path of the drive current flowing from the head drive circuit to the magnetic head element is shortened.

In this case, since the head drive circuit is provided on the base of the optical pickup, it is designed exclusively for a specific type of magnetic head element and the main substrate of the optical disk device. Only needs to output a control signal to the head drive circuit, so that the design of the main board can be general purpose.

[0022]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a preferred embodiment of the present invention will be described in detail with reference to FIGS. still,
Since the embodiments described below are preferred specific examples of the present invention, various technically preferred limitations are added.
The scope of the present invention is not limited to these embodiments unless otherwise specified in the following description.

FIG. 1 shows the configuration of an optical disk device incorporating the first embodiment of the magnetic field modulation head device according to the present invention. In FIG. 1, an optical disk device 10 includes a spindle motor 12 as a driving unit that rotationally drives an optical disk 11 as a magneto-optical disk, an optical pickup 13, a feed motor 14 as the driving unit,
A magnetic field modulation head device 15 having a magnetic field modulation head for recording information on the optical disk 11 is provided.

Here, the spindle motor 12 is driven and controlled by a system controller 16 and a servo control circuit 18, and is rotated at a predetermined rotation speed. Optical disk 11
Although a magneto-optical disc is mainly used, a read-only optical disc such as a compact disc (CD) can also be reproduced.

The optical pickup 13 irradiates the magnetic recording layer of the rotating optical disk 11 with light by means of a light focusing means 21 (see FIG. 2) such as an objective lens.
Alternatively, the head driving circuit 15a drives a magnetic head element (described later) of the magnetic field modulation head device 15 based on a signal from the signal demodulator and the error correction circuit 17,
The signal is recorded. The optical pickup 13 is
The return light from the magnetic recording layer is detected, and a reproduced signal based on the return light is output to the signal demodulator and the error correction circuit 17, or the magnetic signal detected by the magnetic head 15 is detected by the signal demodulator and the error correction circuit. 17 to output a reproduction signal based on the return light.

Thus, the recording signal demodulated in the signal demodulator and the signal demodulation unit of the error correction circuit 17 is error-corrected through the error correction unit. Is transmitted to an external computer or the like via the interface 19. As a result, the external computer and the like
1 can be received as a reproduced signal. When the optical disk device 10 is for audio, the error-corrected recording signal is stored in the D / A, A / D converter 20 as shown by the dotted line.
The digital-to-analog conversion is performed by the D / A converter, and is output as an audio signal.

A feed motor 14 for moving the optical pickup 13 to a predetermined recording track on the optical disk 11, for example, is connected to the optical pickup 13. The spindle motor 12 and the feed motor 14 are controlled by the servo control circuit 18, respectively.

FIG. 2 shows a configuration of a main part of the optical pickup 13 of the optical disk device 10. In FIG. 2, an optical pickup 13 includes a light source 22 for irradiating the light focusing unit 21 with a light beam, and an optical disk 11 for irradiating the optical disk 11 via the light focusing unit 21.
An optical system 23 for separating return light from the
25 and 26 and a differential amplifier 27.

The light source 22 is, for example, a semiconductor laser device and emits a light beam having a predetermined wavelength.

The light focusing means 21 is formed by, for example, an objective lens, and is supported by, for example, a biaxial actuator so as to be movable in a tracking direction which is a radial direction of the optical disk 11 and a focusing direction which is orthogonal to the tracking direction. The light converging means 21 is used for reproducing the light
2 functions to irradiate the recording layer (not shown) formed on the substrate of the optical disc 1 with the light beam from the optical disk 1 and to make the return light reflected by this recording layer incident on the optical system 23. Here, at the time of data recording, the magnetic field modulation head device 15
A magnetic field having an intensity corresponding to a recording signal supplied via the head drive circuit 15a is applied to a laser beam irradiation position.

The optical system 23 causes the light beam from the light source 22 to be incident on the light focusing means 21 and the light focusing means 2.
1 is separated and converted into a convergent light, a part of which is given astigmatism and is incident on the photodetector 24. Further, a part of the light is reflected and transmitted to the photodetector 25 and transmitted again. Light is incident on the photodetector 26.

The photodetector 24 has a function of converting a laser beam incident on each of the photodetectors into an electric signal and outputting the electric signal to the servo control circuit 18 as a servo signal. I do. In addition, the photodetector 2
5 and 26 function to output an electric signal corresponding to the amount of incident return light to the differential amplifier 27, respectively. The differential amplifier 27 calculates the difference between the outputs of the photodetectors 25 and 26, and outputs the calculation result to the signal modulation / demodulator and error correction circuit 17 as a magneto-optical signal (hereinafter, referred to as “MO reproduction signal”). Works like that.

FIG. 3 shows a first embodiment of the magnetic field modulation head device 15. In FIG. 3, the magnetic field modulation head device 15 has a magnetic head element 31 composed of a bobbin to which a magnetic core and a coil (not shown) are attached. Here, the head support member 32 is made of a material having a spring property and conductivity such as, for example, beryllium copper, and the other end is swingably supported by the fixing portion 33.

The magnetic head element 31 includes the magneto-optical disk 1
A head slider (not shown) is provided on the lower surface side opposite to 1. Thus, the magnetic head element 31 is held at a constant interval on the surface of the magneto-optical disk 11 by sliding the head slider on the surface of the magneto-optical disk 11 that is rotationally driven. .

An optical pickup 13 is provided below the magneto-optical disk 11 on the side opposite to the magnetic head element 31. The optical pickup 13 has a main shaft 3
4 and slidably supported along the countershaft 35. As a result, the optical pickup 13 is sought in the radial direction of the magneto-optical disk 11 by a seek mechanism (not shown) to access a desired track position on the magneto-optical disk 11. Further, the fixed portion 33 of the magnetic field modulation head device 15 is mounted on the base 13a of the optical pickup 13. When the optical pickup 13 performs the above-described seek operation, the magnetic field modulation head device 15 also performs the seek operation. It is supposed to do it.

In the magnetic field modulation head device 15, a head drive circuit 15a for driving the magnetic head element 31 is formed on the fixed portion 33. And
The wiring to the head drive circuit 15a is
From the connector 36 provided on the main board 10a
The fixed portion 33 is connected to the base 13 a of the optical pickup 13 via the flexible printed circuit board 37, and further from a connection land 38 provided on the base 13 a of the optical pickup 13 via a power distribution member 39 as a power distribution means. This is performed by being connected to the connection land 40 provided in the upper head drive circuit 15a. In addition, the magnetic head element 3
1, the lead wire (not shown) is routed along the head support member 32, or when the head support member 32 is formed as a suspension using a conductive material, the head support member 32 is used. Through itself,
Is being done.

Here, the flexible printed circuit board 3
7 is different from the flexible printed circuit board 9 in the conventional magnetic field modulation head device 1 shown in FIG. 7 and is configured to include wiring to the magnetic head element 31. Also,
As the power distribution member 39, a lead wire or the like having a function of electrically connecting the magnetic field modulation head device 15 and the optical pickup 13 is used, and the magnetic field modulation head device 15 is connected to the optical pickup 13 during a seek operation. Since they move together, they are not affected by the seek operation at all, and therefore do not need to have seek durability, and therefore need not be a flexible printed circuit board.

Here, the head drive circuit 15a is configured, for example, as shown in FIG. In FIG. 4, the head drive circuit 15a includes an FET as shown in the figure as a control element.
Drive voltage is applied. On the other hand, a control signal is supplied to the gate of the FET from the main board 10a of the optical disc device 10 via the connector 36 via the flexible printed board 37, and further from the connection land 38 of the base 13a of the optical pickup 13 to the power distribution member. The signal is input from the connection land 40 of the head drive circuit 15a through the connection 39. Thus, the head drive circuit 15a allows the drive current to flow to the magnetic head element 31 based on the control signal.

The optical disk device 10 according to the present embodiment comprises:
It is configured as described above. At the time of reproduction, in FIG.
The light beam from the light source 22 of the optical pickup 13 is focused on the recording layer of the optical disc 11 via the light focusing means 21. Then, the return light from the optical disk 11 again enters the photodetectors 24, 25, and 26 of the optical pickup 13 via the light focusing means 21 and the optical system 23. As a result, the photodetectors 25 and 26 convert the signals into electric signals, and the differential amplifier 27 generates an MO reproduction signal, thereby reproducing the data. At the time of recording, a magnetic field having an intensity corresponding to the recording signal supplied via the head drive circuit 15a is applied to the light beam irradiation position of the optical disk 11 by the magnetic head element 31 of the magnetic field modulation head device 15, and the information signal Is performed.

In this case, in the magnetic field modulation head device 15, the driving current which is a relatively large current is supplied from the head driving circuit 15 a provided on the fixed portion 33 to the head supporting member 32.
Along the path relatively short to the magnetic head element 31. On the other hand, only a control signal as a digital signal flows from the main substrate 10a of the optical disk device 10 to the head drive circuit 15a of the magnetic field modulation head device 15 via the flexible printed circuit board 37 and the power distribution member 39.

Thus, the path of the control signal routed from the optical disk device 10 has almost no noise because the control signal is a weak current, and the path from the head drive circuit 15a to the magnetic head element 31 is large. Since the path of the drive current, which is the current, is short, the generation of noise is reduced. Therefore, the occurrence of noise due to the drive current is reduced, so that the influence of noise to the outside is greatly reduced.

The head drive circuit 15a is provided at the fixed portion 3 of the magnetic field modulation head device 15 having the magnetic head element 31.
Therefore, when the magnetic field modulation head device 15 is designed for each type of the magnetic head element 31, the head drive circuit 15a is also designed at the same time. Therefore, the main substrate of the optical disk device is
There is no need to design for each type, and the development cost and product cost of the main board are reduced.

FIG. 4 shows the configuration of a second embodiment of the magnetic field modulation head device according to the present invention. In FIG.
Since the portions denoted by the same reference numerals as those in the first embodiment have the same configuration, the duplicate description will be omitted, and the description will focus on the differences. In the figure, the magnetic field modulation head device 50 is
Is substantially the same as the magnetic field modulation head device 15 shown in FIG. That is, in the magnetic field modulation head device 50, the head drive circuit 15a
Is not on the fixed portion 33 of the magnetic field modulation head device 50,
The optical pickup 13 is provided on a base 13a.

In this case, since a drive current from the head drive circuit 15a flows in the power distribution member 39, for example, a wire or the like is used.

The magnetic field modulation head device 50 having such a configuration is described.
According to this, the drive current which is substantially the same as the magnetic field modulation head device 15 shown in FIG. 3 and which is a relatively large current is supplied from the head drive circuit 15a provided on the base 13a of the optical pickup 13 for connection. Through the land 38, the power distribution member 39, and the connection land 40, a relatively short path to the magnetic head element 31 flows further along the head support member 32. On the other hand, the optical disk device 10
From the main board 10a to the flexible printed board 37
, Only the control signal as a digital signal flows to the head drive circuit 15a on the base 13a of the optical pickup 13.

Thus, the path of the control signal routed from the optical disk device 10 has almost no noise because the control signal is a weak current, and the path from the head drive circuit 15 a to the magnetic head element 31 is large. Since the path of the drive current, which is the current, is short, the generation of noise is reduced. Therefore, the occurrence of noise due to the drive current is reduced, so that the influence of noise to the outside is greatly reduced.

Since the head drive circuit 15a is formed on the base 13a of the optical pickup 13,
The magnetic field modulation head device 1
When the head 5 is designed, the head drive circuit 15a is also designed at the same time. In this case, the head drive circuit 15a
Is formed at the same time as other circuits formed on the base 13a of the optical pickup 13. Therefore, it is necessary to design the main substrate of the optical disk device for each type of the magnetic head element 31 at a low cost. This reduces the development cost and product cost of the main board.

FIG. 6 is a graph comparing the conventional magnetic field modulation head device with the magnetic field modulation head devices of the above-described embodiments by measuring the noise level. As shown in the figure, the noise level is significantly reduced both when the head drive circuit is mounted on the base of the optical pickup and when it is provided on the wiring portion connected to the magnetic head element. I understand.

In the above-described embodiment, the flexible printed board 37 and the power distribution member 39 are connected to the main board 10a of the optical disk device 10 and the base 13a of the optical pickup 13 by connectors 36 and 38, respectively. However, the present invention is not limited to this, and they may be connected directly by soldering or the like.

Further, in the above-described embodiment, the optical disk apparatus for recording / reproducing a magneto-optical disk has been described. However, the present invention is not limited to this, and other types of optical disks, for example, a phase change recording type optical disk and a compact disk (C
Obviously, the present invention can be applied to an optical disk device compatible with a read-only optical disk such as D).

[0051]

As described above, according to the present invention, the wiring path from the head drive circuit for driving the magnetic head element of the magnetic field modulation head device to the magnetic head element is shortened, and the head drive current is reduced. By reducing the generation of noise and configuring the head drive circuit separately from the main substrate of the optical disc device, the development cost and product cost of the head drive circuit are reduced.
An optical pickup, an optical disk device, and a magnetic field modulation head device used for the same can be provided.

[Brief description of the drawings]

FIG. 1 is a schematic block diagram showing a configuration of an optical disk device incorporating a first embodiment of a magnetic field modulation head device according to the present invention.

FIG. 2 is a schematic diagram showing a configuration of an optical pickup in the optical disk device of FIG.

FIG. 3 is a schematic perspective view showing a configuration of a first embodiment of a magnetic field modulation head device in the optical disc device of FIG. 1;

FIG. 4 is a schematic diagram illustrating a configuration example of a head drive circuit in the optical disc device of FIG. 1;

FIG. 5 is a schematic perspective view showing a configuration of a second embodiment of the magnetic field modulation head device in the optical disc device of FIG. 1;

FIG. 6 is a diagram showing a comparison between noise levels of a magnetic field modulation head device according to an embodiment of the present invention and a conventional magnetic field modulation head device.

FIG. 7 is a schematic perspective view showing a configuration of an example of a conventional magnetic field modulation head device.

[Explanation of symbols]

10 optical disk device, 11 optical disk, 1
2 ... spindle motor, 13 ... optical pickup, 14 ... feed motor, 15, 50 ... magnetic field modulation head device, 15a ... head drive circuit, 16 ...
System controller, 17: signal modulator / demodulator and error correction circuit, 18: servo control circuit, 19: interface, 20: D / A, A / D converter, 21
... Light focusing means, 22 ... Light source, 23 ... Optical system, 24, 25, 26 ... Photodetector, 27 ... Differential amplifier, 31 ... Magnetic head element, 32 ..Head support members, 33... Fixed parts, 34...
..Counter shaft, 36 ... connector, 37 ... flexible printed circuit board, 38,40 ... connection land, 39
... power distribution member, 41 ... power supply.

Claims (5)

[Claims] 1. A magnetic head element for recording an information signal on a magneto-optical recording layer of a magneto-optical disk, and the magnetic head element is attached to one end and the other end is swingably supported with respect to a fixed portion. A head support member, and a wiring portion having one end connected to the magnetic head element and the other end disposed on a fixed portion, wherein the fixed portion is mounted on a base of an optical pickup, and A magnetic field modulation head device, wherein a head drive circuit for driving a magnetic head element is provided in the middle or at the end of the wiring portion. 2. A light source, a light converging means for condensing a light beam from the light source from one side of the magneto-optical disk to a magneto-optical recording layer, and a light converging means for returning light from the magneto-optical recording layer of the magneto-optical disk And a magnetic field modulation head device disposed on the other side of the magneto-optical disk, wherein the magnetic field modulation head device is disposed on a magneto-optical recording layer of the magneto-optical disk. A magnetic head element for recording an information signal; a head support member having the magnetic head element attached to one end and the other end swingably supported with respect to a fixed portion; one end connected to the magnetic head element; The other end includes a wiring portion disposed on a fixed portion. The fixed portion is mounted on a base of the optical pickup, and drives a magnetic head element in the middle or at an end of the wiring portion. Head Wherein the drive circuit is provided, the optical pickup. 3. A light source, a light converging means for condensing a light beam from the light source from one side of the magneto-optical disk to a magneto-optical recording layer, and a light converging means for returning light from the magneto-optical recording layer of the magneto-optical disk And a magnetic field modulation head device disposed on the other side of the magneto-optical disk, wherein the magnetic field modulation head device is disposed on a magneto-optical recording layer of the magneto-optical disk. A magnetic head element for recording an information signal; a head support member having the magnetic head element attached to one end and the other end swingably supported with respect to a fixed portion; one end connected to the magnetic head element; The other end includes a wiring portion disposed on a fixed portion. The fixed portion is mounted on a base of an optical pickup, and a head driving circuit for driving the magnetic head element is provided with an optical pickup. And a power distribution means for electrically connecting the other end of the wiring portion of the magnetic field modulation head device to a connection portion on the base of the optical pickup. An optical pickup. 4. A magneto-optical disk, comprising: a rotation driving means for rotatingly driving the magneto-optical disk; and irradiating a light beam from a light source to the magneto-optical recording layer from one side of the magneto-optical disk via a light focusing means. An optical pickup, which detects return light from the magneto-optical recording layer by a photodetector via a light focusing means and records an information signal from the other side of the magneto-optical disk by a magnetic field modulation head device; Means for supporting the means movably in the biaxial direction, that is, the focusing direction and the tracking direction; a signal processing circuit for generating a reproduction signal based on a detection signal from the photodetector; and a signal processing circuit based on the detection signal from the photodetector. And a servo circuit for moving the light focusing means of the optical pickup in two axial directions, wherein the magnetic field modulation head device is provided for the magneto-optical recording layer of the magneto-optical disk. A magnetic head element for recording an information signal by means of a magnetic head element, a head support member having the magnetic head element attached to one end and the other end swingably supported with respect to a fixed portion, and one end connected to the magnetic head element. And the other end includes a wiring portion provided on a fixed portion. The fixed portion is mounted on a base of the optical pickup, and drives the magnetic head element in the middle or at the end of the wiring portion. An optical disc device, comprising a head drive circuit for the same. 5. A rotation driving means for rotating and driving the magneto-optical disk, and a light beam is irradiated from one side of the rotating magneto-optical disk to the magneto-optical recording layer from a light source through a light focusing means. An optical pickup for detecting return light from the magneto-optical recording layer of the magnetic disk by a photodetector via a light focusing means and recording an information signal from the other side of the magneto-optical disk by a magnetic field modulation head device; A means for supporting the light focusing means so as to be movable in two axial directions, that is, a focusing direction and a tracking direction; a signal processing circuit for generating a reproduction signal based on a detection signal from the photodetector; and a detection signal from the photodetector. And a servo circuit for moving the light focusing means of the optical pickup in two axial directions based on the magnetic field modulation head device. A magnetic head element for recording an information signal on a layer, a head support member having the magnetic head element mounted at one end and the other end swingably supported with respect to a fixed portion, and a magnetic head element at one end And a wiring portion, the other end of which is disposed on a fixed portion, wherein the fixed portion is mounted on a base of an optical pickup, and a head drive circuit for driving the magnetic head element is provided. And a power distribution means for electrically connecting the other end of the wiring portion of the magnetic field modulation head device to a connection portion on the base of the optical pickup. An optical disc device characterized by the above-mentioned.