JPH0512745A - Magnetooptic disk device - Google Patents

Abstract

PURPOSE:To simplify a positioning mechanism for an optical pickup, to reduce the mass, to increase the moving speed of the optical pickup 3, and to precisely position the optical pickup and an external magnetic field producing means by using both surfaces of a disk effectively and employing the same positioning mechanism for both a magnetic head and the external magnetic field producing means. CONSTITUTION:The magnetooptical disk device uses the disk 1 which has a magnetooptical recording medium 1e and a magnetic recording medium if formed on the same substrate 1a, and the disk is irradiated on the side of the magnetooptical recording medium 1e with a light beam by the optical pickup 3 to record and reproduce information on the magnetooptical recording medium 1e and applied on the other side with a magnetic field by a magnetic head 29 to record and reproduce information on the magnetic recording medium 1f. Further, the external magnetic field producing means for magnetooptical recording is positioned by the same positioning mechanism with the magnetic head for magnetic recording.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention performs magneto-optical recording / reproducing and magnetic recording / reproducing on a magneto-optical disk having a magneto-optical recording medium and a magnetic recording medium formed on the same substrate by an optical pickup and a magnetic head. The present invention relates to a magneto-optical disk device.

[0002]

2. Description of the Related Art At present, there is widely known a magneto-optical disk device which focuses a light beam on a minute spot and irradiates the magneto-optical recording medium to record and reproduce information. In such a magneto-optical disk device, as a magneto-optical recording medium, a perpendicular magnetization film whose magnetization is oriented perpendicular to the disk surface is used.

At room temperature, since the coercive force of this perpendicularly magnetized film is large, it is difficult to change the direction of magnetization. However, when the perpendicular magnetic film is irradiated with a light beam, the temperature of that part rises, and the coercive force decreases as it approaches the Curie temperature. Therefore, if an external magnetic field is applied in the opposite direction, only the part irradiated with the light beam will The magnetization direction is reversed, and information can be recorded. Information can be recorded by an optical modulation method that keeps the external magnetic field constant and blinks the light beam according to the information, and a magnetic modulation method that keeps the light beam constant and reverses the direction of the external magnetic field according to the information. There is.

When recording information by the magnetic field modulation method, it is necessary to reverse the external magnetic field at high speed. In this case, the external magnetic field generating magnet becomes very small, and it is difficult to apply the magnetic field to the entire surface of the disk, and the magnetic field is applied only to a narrow range where the light beam is irradiated. Therefore, in order to accurately match the positions of the light beam and the external magnetic field generating magnet, the optical pickup and the external magnetic field generating magnet are positioned by the same positioning mechanism.

The information recorded on the disc is reproduced by detecting the change in the polarization plane of the reflected light from the disc. Usually, in a disc on which this magneto-optical recording medium is formed, a guide groove and a portion where irregularities called a preformat portion are formed are formed in advance when the disc is manufactured. The guide groove is used for tracking to irradiate a predetermined track with the light beam, and the light beam is scanned by the tracking servo mechanism along the guide groove.

On the other hand, address information such as a track number and a sector number is recorded in the preformat section, and the magneto-optical disk apparatus reproduces this address information to detect the track scanned by the light beam. You can know the physical location.

[0007]

However, since an optical pickup composed of many optical components is very expensive, the magneto-optical disk device is usually provided with only one optical pickup. . Furthermore, the disk cannot be taken out of the magneto-optical disk device,
That is, if you cannot turn the disc over,
Information can be recorded / reproduced only on one side of the disc. Therefore, in such a magneto-optical disk device, a double-sided disk formed by sticking two disks together is not used, but a single-sided disk is used, and the back surface of this disk is not effectively utilized.

Since the optical pickup and the external magnetic field generating magnet are positioned by the same positioning mechanism, the magneto-optical pickup and the external magnetic field generating magnet can always maintain a fixed positional relationship. However, the mass of the movable portion of the positioning mechanism becomes large, which causes a problem that the moving speed of the optical pickup decreases.

[0009]

In order to solve the above-mentioned problems, a magneto-optical disk device according to a first aspect of the present invention has a magneto-optical recording medium formed on a substrate having optical transparency, and a magnetic recording medium. An optical pickup for irradiating the magneto-optical recording medium with a light beam from the substrate side, an external magnetic field generating means for applying a magnetic field to the magneto-optical recording medium, and a magnetic recording medium from the other side for the magnetic recording medium. And a magnetic head for applying a magnetic field.

A magneto-optical disk device according to a second aspect of the present invention is the magneto-optical disk device according to the first aspect of the invention, wherein an optical pickup positioning mechanism for positioning the optical pickup and an external magnetic field generating means are provided. And a magnetic head positioning mechanism for simultaneously positioning the magnetic head, wherein the optical pickup positioning mechanism and the magnetic head positioning mechanism are position information recorded on the magneto-optical recording medium reproduced by the optical pickup,
The position of the external magnetic field generating means and the optical pickup are aligned by comparing the position information recorded on the magnetic recording medium reproduced by the magnetic head.

[0011]

According to the structure of the present invention, a magneto-optical recording medium is formed on a substrate having optical transparency, and a disk on which the magnetic recording medium is formed is used, and an optical pickup and an optical pickup for the magneto-optical recording medium are used. Information is recorded and reproduced by the external magnetic field generating means, while information is recorded and reproduced by the magnetic head on the magnetic recording medium. Therefore, even if the magneto-optical disk apparatus has only one optical pickup and the disk is not removed from the magneto-optical disk apparatus, that is, even if the disk cannot be turned inside out, both sides of the disk can be effectively used. It is possible to use.

According to the second aspect of the invention, the magnetic head and the external magnetic field generating means are positioned by the same positioning mechanism, and the optical pickup and the external magnetic field generating means are positioned by separate positioning mechanisms. Done. Positioning of the optical pickup and the external magnetic field generating means is performed by position information on the magneto-optical recording medium reproduced by the optical pickup and magnetic recording reproduced by a magnetic head positioned by the same positioning mechanism as the external magnetic field generating means. It is performed by comparing with the position information on the medium.

Therefore, as compared with the conventional case where the magneto-optical pickup and the external magnetic field generating means are positioned by the same positioning mechanism, the positioning mechanism of the magneto-optical pickup is simplified and its mass is also reduced. Decrease.

[0014]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The following will describe one embodiment of the present invention with reference to FIGS.

As shown in FIG. 2, the disk 1 used in the magneto-optical disk device of the present embodiment has, for example, DyFe on the surface of a disk-shaped transparent substrate 1a made of glass or the like.
Perpendicular magnetic film 1b made of Co and reflective film 1 made of Al
c and a protective layer 1d, a magneto-optical recording medium layer (magneto-optical recording medium) 1e is formed.
A magnetic recording medium layer (magnetic recording medium) 1f made of B is formed. A guide groove 1g is previously formed on the substrate 1a for tracking.

Further, the magneto-optical disk device comprises an optical pickup 3 shown in FIG.

The optical pickup 3 comprises a semiconductor laser 1
7, a coupling lens 18 and a collimator lens 19 that shape the laser light emitted from the semiconductor laser 17.
A first beam splitter 20, an objective lens 21 for condensing a light beam on the disk 1, a second beam splitter 22, a polarization beam splitter 23, and optical signal detection light receiving elements 24, 24. Cylindrical lens 2
5 and a four-division light receiving element 26 for detecting a servo signal.

When recording information, the semiconductor laser 17 is designed to blink with high power according to the information to be recorded by the semiconductor laser drive signal LD.

The objective lens 21 is held by a tracking actuator 27 and a focus actuator 28, and is moved in the tracking direction and the focus direction by the tracking actuator 27 and the focus actuator 28.

The first beam splitter 20 guides the laser light from the semiconductor laser 17 to the objective lens 21 and guides the reflected light reflected by the disk 1 to the second beam splitter 22.

The cylindrical lens 25 further converts the light beam incident from the second beam splitter 22 into
The light is incident on the four-division light receiving element 26 for servo signal detection. This 4-division light receiving element 26 for servo signal detection
The servo signals A, B, C and D are generated by the output of
It is adapted to be input to a recording / reproducing signal processing circuit 10 described later.

Further, the reproduction signal of the address information recorded in the pre-formatted portion by forming the concavities and convexities is also the sum of the servo signals A, B, C and D detected by the servo signal detecting four-division light receiving element 26. Obtainable.

The polarization beam splitter 23 splits the light beam incident from the second beam splitter 22 into two beams according to the difference in the polarization direction and introduces them into the light receiving elements 24, 24 for detecting optical signals. ing. The detection signal S which is the output of the light receiving element 24 for detecting the optical signal
a.Sb is introduced into a recording / reproducing signal processing circuit 10 which will be described later, and information is reproduced by a difference between the detection signals Sa and Sb detected by the optical signal detecting light receiving elements 24. There is.

Further, as shown in FIG. 1, the magneto-optical disk apparatus includes a spindle motor 2 for rotating the disk 1, a spindle motor control circuit 8, and a linear motor for driving the optical pickup 3 in the radial direction of the optical disk 1. A motor (positioning mechanism for optical pickup) 6, a linear motor drive circuit 7, a servo signal control circuit 9, and a recording / reproducing signal processing circuit 10 are provided.

The recording / reproducing signal processing circuit 10 outputs a focus error signal based on the outputs of the optical signal detecting light receiving elements 24, 24 and the servo signal detecting four-divided light receiving element 26 shown in FIG. 2 in the optical pickup 3. The tracking error signal and the reproduction signal are generated, and these signals are input to the control unit 16.

The spindle motor control circuit 8 drives the spindle motor 2 based on the signal input from the control unit 16. The linear motor drive circuit 7 also drives the linear motor 6 based on the signal input from the control unit 16.

The servo signal control circuit 9 generates a tracking signal RD and a focus signal FD based on the signal input from the control unit 16, and drives the tracking actuator 27 and the focus actuator 28 in the optical pickup 3. It has become.

On the other hand, an external magnetic field generating magnet (external magnetic field generating means) 4 and an external magnetic field generating magnet control circuit 11 are provided at a position facing the optical pickup 3 with the disc 1 interposed therebetween. The magnet 4 for generating an external magnetic field is the disk 1
A magnetic field is applied to a predetermined region extending in the radial direction of. The external magnetic field generating magnet control circuit 11 is configured to generate a magnetic field in the external magnetic field generating magnet 4 based on a signal input from the control unit 16.

Further, a slider 5 in which a ring type magnetic head 29, which will be described later, is embedded and a magnetic head drive circuit 12 are provided on the same side as the external magnetic field generating magnet 4. The magnetic head drive circuit 12 is adapted to generate a magnetic field in the ring type magnetic head 29 based on a signal input from the control unit 16. The slider 5 is supported by a suspension 13 and its position is controlled by a voice coil motor (positioning mechanism for magnetic head) 14 via the suspension 13. Further, a voice coil motor drive circuit 15 for driving the voice coil motor 14 in accordance with a signal input from the control unit 16 is also provided.

The ring-type magnetic head 29, as shown in FIG. 4, has a slider 5 attached to the suspension 13.
It is buried in. The ring-shaped magnetic head 29 has a structure in which a coil 31 is wound around a ring-shaped core 30 made of, for example, ferrite.

When the disk 1 is stationary,
The slider 5 uses the suspension 13 for the disk 1
It has been pressed against. On the other hand, disk 1
When is rotated, the slider 5 floats by several μm due to its kinetic energy and air viscosity.

In the magneto-optical disk having the above-mentioned structure, FIG.
In order to record information on the magneto-optical recording medium layer 1e of the disk 1 shown in (1), the disk 1 is irradiated with high power from the magneto-optical pickup 3 while the disk 1 is rotated by the spindle motor 2. At this time, a magnetic field is generated from the external magnetic field generating magnet 4 in the erasing direction to align the magnetization direction of the perpendicular magnetization film 1b in the magneto-optical recording medium layer 1e whose coercive force is lowered by the irradiation of the light beam. After that, while the magnetic field is applied in the recording direction by the external magnetic field generating magnet 4, the light beam is made to blink with high power according to the recorded information. As a result, the direction of the perpendicular magnetization film 1b in the portion irradiated with the light beam is reversed, and information is recorded.

In order to reproduce the information recorded in the magneto-optical recording medium layer 1e, the magneto-optical recording medium layer 1e is irradiated with a light beam with a low power from the optical pickup 3 and reflected by the disk 1. The inclination of the plane of polarization of the reflected light is detected by the polarization beam splitter 23 and the optical signal detecting light receiving elements 24, 24 (see FIG. 3) in the optical pickup 3, and a reproduction signal is generated in the recording / reproduction signal processing circuit 10.

The high power of the light beam referred to here is the intensity of the light beam which raises the temperature of the perpendicular magnetization film 1b of the magneto-optical recording medium layer 1e to the Curie point, and the low power is the perpendicular magnetization film 1b. Refers to the intensity of the light beam that can be heated up to a temperature at which it has a sufficient coercive force.

When information is recorded / reproduced,
The optical beam emitted from the optical pickup 3 is transmitted to the disc 1
In order to follow the predetermined track, the magneto-optical pickup 3 is driven by the linear motor 6 in the radial direction of the disk 1. Then, in order to position the light beam more accurately, the tracking actuator RD and the focus actuator 28 (see FIG. 3) in the optical pickup 3 are driven by the tracking signal RD and the focus signal FD generated in the servo signal control circuit 9. The position of the light beam is controlled.

On the other hand, with respect to the magnetic recording medium layer 1f formed on the magneto-optical recording medium layer 1e of the disc 1,
In order to record information, the ring type magnetic head 29 is positioned by the voice coil motor 14, and as shown in FIG. 5, the current flowing through the coil 31 of the ring type magnetic head 29 is inverted according to the information, and the magnetic A magnetic field exceeding the coercive force of the recording medium layer 1f is applied. As a result, the magnetic recording medium layer 1f is magnetized in a direction parallel to the disk surface, and information is recorded.

In order to reproduce the information recorded on the magnetic recording medium layer 1f, the rotation of the disk 1 causes a change in magnetic flux, and the change in magnetic flux causes the magnetic recording medium in the coil 31 of the ring type magnetic head 29. A voltage corresponding to the magnetization direction of the layer 1f is induced. Incidentally, the magneto-optical recording medium layer 1
In the perpendicular magnetic film 1b of e, information is recorded in the direction of perpendicular magnetization by the optical pickup from the transparent substrate 1a side.

The coercive force of the magnetic recording medium layer 1f is large enough not to be affected by the magnetic field generated from the external magnetic field generating magnet 4 used for magneto-optical recording, and the coercive force of the magneto-optical recording medium layer 1e is also large. The coercive force at room temperature is set so large that it is not affected by the magnetic field generated by the ring type magnetic head 29.

As described above, in the magneto-optical disk device of this embodiment, a light beam is emitted from the substrate 1a side of the disk 1 to the magneto-optical recording medium layer 1e formed on the disk 1 by the optical pickup 3. By irradiating and applying a magnetic field from the other surface side by the external magnetic field generating magnet 4,
Information is recorded. Further, a magnetic field is applied from the same surface as the external magnetic field generating magnet 4 to the magnetic recording medium layer 1f formed on the magneto-optical recording medium layer 1e by the ring type magnetic head 29 to record information. Done.

As a result, even when the magneto-optical disk device is provided with only one optical pickup, or when the disk cannot be removed from the magneto-optical disk device, that is, the disk cannot be turned inside out. , Both sides of the disc can be effectively used.

Next, another embodiment of the present invention will be described with reference to FIG.
The following is a description with reference to FIG.
For convenience of explanation, members having the same functions as those of the members shown in the drawings of the above-described embodiment are designated by the same reference numerals, and the description thereof will be omitted.

As shown in FIG. 7, the magneto-optical disk device of this embodiment has a perpendicular magnetic head 32 as an external magnetic field generating means for applying a magnetic field to the magneto-optical recording medium layer 1e and a magnetic field to the magnetic recording medium. Except that the applied ring-type magnetic head 29 is embedded in the same slider 5,
The configuration is the same as that of the above-mentioned embodiment.

As shown in FIG. 7B, the vertical magnetic head 32 is constructed by winding a coil 34 around a rod-shaped core 33 made of, for example, ferrite. Then, as shown in FIG. 7A, the vertical magnetic head 32 is embedded in the same slider 5 as the ring magnetic head 29 in the vicinity of the ring magnetic head 29.

The magneto-optical disk device of this embodiment employs a magnetic field modulation method as a method of recording information.
That is, the optical pickup 3 shown in FIG. 6 irradiates the magneto-optical recording medium layer 1e of the disk 1 with a light beam at a high power constantly, and the perpendicular magnetic head 32 is wound according to the information to be recorded. An external magnetic field is applied to the magneto-optical recording medium layer 1e while changing the direction of the external magnetic field by changing the direction of the current flowing through the coil 34. As a result, the magnetization direction of the perpendicular magnetization film 1b in the magneto-optical recording medium layer 1e is reversed according to the recording information.

In order to position the light beam emitted from the optical pickup 3 on a desired track, the address information previously recorded by the concave and convex portions is reproduced by the optical pickup 3 when the disc 1 is formed. The control unit 16 grasps the physical position of the light beam from the reproduction data, and calculates and calculates the difference between the position irradiated with the light beam and the desired track.

Then, a control signal is sent from the control unit 16 to the linear motor drive circuit 7 and the servo signal control circuit 9, and the linear motor 6 and the tracking actuator 27 in the optical pickup 3 up to the track where desired address information is obtained. And the focus actuator 28. As a result, the optical pickup 3 and the objective lens 21 are displaced, and the light beam is emitted to a desired track.

On the other hand, in order to position the ring type magnetic head 29, the address information recorded by magnetic recording when the magnetic recording medium layer 1f is formatted is changed to
This is performed by reproducing with the ring type magnetic head 29. The control unit 16 grasps the physical position of the ring type magnetic head 29 from the reproduced data, and calculates the difference between the actual position of the ring type magnetic head 29 and the desired track to calculate the voice coil motor. A control signal is sent to the drive circuit 15.

This control signal drives the voice coil motor 14 to displace the ring type magnetic head 29 on a desired track.

At this time, since the ring type magnetic head 29 and the vertical type magnetic head 32 are fixed to the same slider 5, the ring type magnetic head 29 is displaced and the vertical type magnetic head 32 is also displaced. Become. Incidentally, the positional relationship between the address information recorded on the magnetic recording medium layer 1f and the address information recorded on the magneto-optical recording medium layer 1e is constant, and the control unit 16
Reproduces the address information of the magnetic recording medium layer 1f to determine which track of the magneto-optical recording medium layer 1e is being scanned by the perpendicular magnetic head 32 which applies an external magnetic field to the magneto-optical recording medium layer 1e. You can figure it out.

For example, as shown in FIG. 8, when the control unit 16 receives an instruction from the host device to record data at a position indicated by a predetermined address on the magneto-optical recording medium layer 1e (S1). First, the address of the magnetic recording medium layer 1f at the same radial position corresponding to the instructed address of the magneto-optical recording medium layer 1e is calculated (S2).

In the disk used at this time, for example, the track number (0) of the magneto-optical recording medium layer 1e and the track number (0) of the magnetic recording medium layer 1f coincide with each other, and It is assumed that the track density of the magnetic recording medium layer 1f is 1/10 of the track density of the recording medium layer 1e.

In order to calculate the address of the magnetic recording medium layer 1f from the address of the magneto-optical recording medium layer 1e, the calculation MA = OA / 10 + k is performed, and the decimal places are rounded off. Here, MA is an address of the magnetic recording medium layer 1f, OA is an address of the magneto-optical recording medium layer 1e, k is a disk of a ring type magnetic head 29 for magnetic recording and a perpendicular magnetic head 32 for magneto-optical recording. The radial distance is converted into the number of tracks of the magneto-optical recording medium layer 1e.

Next, the control unit 16 sends a control signal to the linear motor drive circuit 7 and the servo signal control circuit 9 so that the address information reproduced from the magneto-optical recording medium layer 1e is the address designated by the host device. The linear motor 6, the tracking actuator 27, and the focus actuator 28 are driven to displace the light beam until they are positioned (S3, S4).

After that, the voice coil motor drive circuit 15
A control signal from the control unit 16 is input to the ring magnetic head 29 via the voice coil motor 14 until the address information reproduced from the magnetic recording medium layer 1f matches the address obtained by the above calculation.
Is displaced (S5, S6).

Then, by confirming that the addresses reproduced by the optical pickup 3 and the ring type magnetic head 29 are predetermined addresses, respectively, the light beam emitted from the optical pickup 3 and the ring type magnetic head 29 are confirmed. Positioning is performed with respect to the displacing vertical magnetic head 32, and information recording operation is started (S7).

As described above, in the magneto-optical disk device of this embodiment, the same slider 5 is provided on the same slider 5 for the magnetic recording ring type magnetic head 29 and the magneto-optical recording vertical type magnetic head 3.
2 and are fixed. Therefore, when the information is recorded on the magneto-optical recording medium layer 1e, the vertical magnetic head 32 is positioned by reproducing the address information recorded on the magnetic recording medium layer 1f by the ring magnetic head 29. Therefore, the positioning of the optical pickup 3 for irradiating the light beam is performed by a different mechanism.

In the past, since the optical pickup 3 and the vertical magnetic head 32 were aligned by the same positioning mechanism, the mass of the positioning mechanism was increased and the moving speed of the optical pickup 3 was lowered. It was However, as described above, by positioning the optical pickup 3 and the vertical magnetic head 32 with different positioning mechanisms, the structure of the positioning mechanism of the optical pickup 3 is simplified, the mass is reduced, and the optical pickup is The moving speed of 3 increases, and the light beam and the external magnetic field can be accurately positioned.

In the magneto-optical disk device of this embodiment, the magnetic field modulation method is adopted as a method for recording information on the magneto-optical recording medium layer. For example, in the case where the optical modulation method is adopted. However, the present invention can be applied.

[0059]

As described above, the magneto-optical disk device according to the first aspect of the present invention uses the disk in which the magneto-optical recording medium is formed on the substrate having optical transparency and the magnetic recording medium is further formed. An optical pickup for irradiating the magneto-optical recording medium with a light beam from the substrate side, an external magnetic field generating means for applying a magnetic field to the magneto-optical recording medium, and a magnetic head for applying a magnetic field to the magnetic recording medium from the other surface side. It is a configuration provided with.

Therefore, the optical beam is irradiated from the substrate side of the disk, and the magnetic field is applied from the external magnetic field generating means to record information on the magneto-optical recording medium.
Information can be recorded on the magnetic recording medium by applying a magnetic field from the other surface side. Therefore, only one optical pickup is provided in the magneto-optical disk device,
Moreover, even when the disc is not removed, both sides of the disc can be effectively used.

A magneto-optical disc device according to a second aspect of the present invention is the magneto-optical disk device according to the first aspect of the invention, wherein an optical pickup positioning mechanism for positioning the optical pickup and an external magnetic field generating means are provided. And a magnetic head positioning mechanism for simultaneously positioning the magnetic head, wherein the optical pickup positioning mechanism and the magnetic head positioning mechanism are position information recorded on the magneto-optical recording medium reproduced by the optical pickup,
By comparing the position information recorded on the magnetic recording medium reproduced by the magnetic head, the external magnetic field generating means and the optical pickup are aligned with each other.

Therefore, the external magnetic field generating means is positioned together with the magnetic head, and a mechanism different from the positioning of the optical pickup is used. Therefore, the structure of the positioning mechanism for the optical pickup is simplified, the mass is reduced, the moving speed of the optical pickup is increased, and the positioning of the optical pickup and the external magnetic field generating means is performed with high accuracy.

[Brief description of drawings]

FIG. 1 is a block diagram showing a configuration of a magneto-optical disk device according to an embodiment of the present invention.

FIG. 2 is a sectional view showing a disk used in the magneto-optical disk device.

FIG. 3 is a block diagram showing a configuration of an optical pickup provided in the magneto-optical disk device.

FIG. 4 is a perspective view showing a magnetic head, a slider, and a suspension included in the magneto-optical disk device.

FIG. 5 is a schematic diagram showing a state in which information is recorded by a magnetic head in the magneto-optical disk device.

FIG. 6 is a block diagram showing the configuration of a magneto-optical disk device according to another embodiment of the present invention.

7 is a perspective view showing a magnetic head, a slider, and a suspension included in the magneto-optical disk device shown in FIG.

8 is a flowchart for explaining positioning of an optical pickup and a magnetic head in the magneto-optical disk device of FIG.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 disk 1a substrate 1e magneto-optical recording medium layer (magneto-optical recording medium) 1f magnetic recording medium layer (magnetic recording medium) 3 optical pickup 4 external magnetic field generating magnet (external magnetic field generating means) 6 linear motor (optical pickup positioning mechanism) ) 14 voice coil motor (positioning mechanism for magnetic head) 29 ring type magnetic head 32 vertical type magnetic head

Claims (2)

[Claims] 1. An optical pickup comprising a magneto-optical recording medium formed on a light-transmissive substrate, and a disc on which the magnetic recording medium is formed, the optical pickup irradiating the magneto-optical recording medium with a light beam from the substrate side. A magneto-optical disk device comprising: an external magnetic field generating means for applying a magnetic field to the magneto-optical recording medium; and a magnetic head for applying a magnetic field to the magnetic recording medium from the other surface side. 2. An optical pickup positioning mechanism for positioning the optical pickup, and a magnetic head positioning mechanism for simultaneously positioning the external magnetic field generating means and the magnetic head. The optical pickup positioning mechanism and the magnetic head are provided. The positioning mechanism compares the position information recorded on the magneto-optical recording medium reproduced by the optical pickup with the position information recorded on the magnetic recording medium reproduced by the magnetic head, to thereby detect the external magnetic field generation means. 2. The magneto-optical disk device according to claim 1, wherein the optical pickup is aligned.