JPH10320707A - Magneto-optical disk device and method for adjusting setting position of its head mechanism - Google Patents

Abstract

PROBLEM TO BE SOLVED: To adjust rigidly and rapidly a setting position of a magnetic head for an optical head optical axis by providing a magnetic head setting position adjusting fine adjustable mechanism for the optical head optical axis on an arm mechanism holding the magnetic head and the optical head. SOLUTION: First, second screws 15, 16 are provided on the arm 3 placing the optical head and magnetic head as the fine adjustable mechanism. Then, not only a gimbals spring attaching plate 13, but also the magnetic head is moved by the rotation amount of the first screw 15 in the radial direction X-X of a magneto-optical disk 7 by forward/backward rotating the first screw 15. Further, the magnetic head is moved by the rotation amount of the second screw 16 in the peripheral direction Y-Y of the magneto-optical disk 7 by rotating the second screw 16. In such a manner, since the magnetic head is moved easily by a required minute distance in the required direction, a magnetic head main magnetic pole is made rapidly and precisely coincide with the optical axis Z-Z of the optical head.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magneto-optical disk device and a method of adjusting a set position of a head mechanism mounted on the magneto-optical disk device, and more particularly to a magneto-optical disk device suitable for improving a recording frequency and the magneto-optical disk. The present invention relates to a method for adjusting a relative set position of an optical head and a magnetic head mounted on an apparatus.

[0002]

2. Description of the Related Art Conventionally, similarly to a magnetic disk such as a floppy disk, as an information recording medium on which information can be repeatedly recorded, reproduced, and erased, magnetic recording is performed on a magnetic layer by an external magnetic field using photoheat generated by a laser beam. Magneto-optical disks for performing the above have been put to practical use. As a drive device for such a magneto-optical disk, an optical head that focuses a laser beam spot on a magnetic layer of the magneto-optical disk and a magnetic head that applies an external magnetic field to the magnetic layer are provided on both sides of the magneto-optical disk. A head in which a head is arranged opposite to the head is generally used.

The diameter of a laser beam spot applied to a magnetic layer is about 3 to 5 μm, while the size of a main pole constituting a magnetic head is as large as 100 to 300 μm. On the other hand, it is not necessary to exactly match the axis of the main magnetic pole, and it is sufficient to set the magnetic head in a range in which a magnetic field required for recording or erasing information is applied to the irradiated portion of the laser beam spot.

A configuration of a conventionally known head mechanism of a magneto-optical disk drive and a method of adjusting a set position of a magnetic head with respect to an optical axis of an optical head will be described below with reference to FIG.

As shown in FIG. 14, an optical head 1 and a magnetic head 2 are both mounted on an arm 3 and are opposed to each other with the main magnetic pole 2a of the magnetic head 2 substantially aligned with the optical axis ZZ of the optical head 1. Are located. The optical head 1 is fixed to the lower arm 3a with the objective lens 1a facing upward. The objective lens 1a is provided with actuators for auto focus and tracking control (not shown), and by operating these actuators, the focusing position of the laser beam spot can be appropriately changed. . On the other hand, the magnetic head 2
Is mounted on a slider 4, and the slider 4 is mounted on an upper surface of the arm 3 via a gimbal spring 5. The gimbal spring 5 is fixed to the upper surface of the arm 3 by a screw 6, but the gimbal spring 5 has a screw insertion hole 5a having a diameter sufficiently larger than the diameter of the screw 6, so that the gimbal spring 5 has a screw insertion hole 5a. If the screw 6 is screwed into the arm 3b via a large washer or the like, before the screw 6 is tightened, the optical head 1 (more precisely, the objective lens 1
The set position of the magnetic head 2 with respect to the set position a) can be adjusted within the range. The arm 3 can be linearly moved in the radial direction of the magneto-optical disk 7 by a driving device (not shown), or the base end of the arm 3 can be pivotally connected to a predetermined position of the magneto-optical disk device. The head setting portion can be turned in an arc shape in a direction along the radial direction of the magneto-optical disk 7.

In this configuration, the setting position of the magnetic head 2 is adjusted by mounting the magneto-optical disk 7 on the magneto-optical disk device and recording information on the magneto-optical disk 7 and reproducing information from the magneto-optical disk 7. It is done by repeating. That is, at the stage when the assembly of the magneto-optical disk device is completed, the magneto-optical disk 7 is mounted on the magneto-optical disk device, and the magnetic head 2 irradiates a laser beam with a recording intensity from the optical head 1 while a magnetic field having a predetermined recording intensity is emitted from the magnetic head 2. To record information on the magneto-optical disk 7. Next, the drive of the magnetic head 2 is stopped, and the laser beam emitted from the optical head 1 is switched to the reproduction intensity to reproduce the recorded information. If the reproduction signal output detected by the optical head 1 does not reach the predetermined value, it is determined that an external magnetic field of a predetermined strength is not applied to the magnetic layer because the set position of the magnetic head 2 is inappropriate, Loosen the screw 6 and change the mounting position of the gimbal spring 5 on the arm 3. Hereinafter, the above operations are repeated until a reproduction signal output of a predetermined value or more is obtained.

[0007]

By the way, in the field of magneto-optical recording, improvement of the recording frequency is one of the most important technical problems. In order to improve the recording frequency, it is essential to reduce the size of the magnetic head 2. However, when the size of the magnetic head 2 is reduced, the distribution of the magnetic field generated from the magnetic poles becomes narrower.
Requires a more accurate position setting.

However, the above-described conventional magnetic head position adjusting mechanism does not include a fine movement mechanism for the magnetic head position, so that the magnetic head 2 can be positioned with high precision with respect to the optical axis of the optical head. It is difficult to adjust the position of the magnetic head with high efficiency. In addition, in the above-described conventional method of adjusting the position of the magnetic head, since it is necessary to actually record information on the magneto-optical disk, there is a possibility that information that needs to be stored is erased by mistake.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problem, and an object of the present invention is to provide a magneto-optical disk drive capable of precisely and quickly adjusting a setting position of a magnetic head with respect to an optical axis of an optical head. And an adjustment method.

[0010]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention relates to a magneto-optical disk drive. First, a magnetic layer of the magneto-optical disk is provided on both sides of the magneto-optical disk via a magneto-optical disk. In a magneto-optical disk drive in which an optical head that focuses a laser beam spot on a magnetic layer and a magnetic head that applies an external magnetic field to the magnetic layer are opposed to each other, an arm mechanism that holds the magnetic head and the optical head includes: A fine movement mechanism for adjusting a set position of the magnetic head with respect to an optical axis of the optical head is provided.

The fine movement mechanism may be a mechanism in which a member including a magnetic head, a slider and a gimbal spring is slidably mounted on the arm mechanism, and the member is slid by a fine movement actuator such as an adjusting screw or a piezo element. . By providing the fine movement mechanism of the magnetic head in this way, compared with a case where the set position of the magnetic head is changed by using the clearance of the screw insertion hole formed in the gimbal spring, the magnetic head is moved by a desired minute distance in the desired direction. Since the head can be moved, the set position of the magnetic head with respect to the optical axis of the optical head can be quickly and accurately adjusted.

Second, in the same magneto-optical disk device as described above, an optical head for converging a laser beam spot on a magnetic layer of the magneto-optical disk on both sides via the magneto-optical disk, and In a magneto-optical disk drive in which a magnetic head for applying an external magnetic field is arranged opposite to a magnetic head, a plurality of magnetic heads can be mounted adjacent to one slider and these magnetic heads can be driven independently. The head drive device is provided.

When a plurality of magnetic heads are mounted adjacent to one slider in this manner, each magnetic head is individually driven to repeatedly record and reproduce signals, and a magnetic head having the best reproduction characteristics is obtained. The selection enables positioning of the optical head and the magnetic head, so that the assembly or maintenance of the magneto-optical disk device can be facilitated as compared with the case where the magnetic head is driven to search for the optimum position.

Third, in a magneto-optical disk drive having an optical head and a magnetic head arranged opposite to each other, a laser beam emitted from the optical head around the main magnetic pole setting portion of the slider holding the magnetic head. The photodetector for detecting the beam is provided.

In this case, the photodetector is mounted on the side of the magnetic head or slider facing the disk with the light receiving surface facing the disk surface of the magneto-optical disk, and directly detects the laser beam transmitted through the magneto-optical disk or the dummy disk. Alternatively, the light receiving surface may be attached to an arbitrary position of the magnetic head or slider with the light receiving surface directed in an arbitrary direction, and one end of the light may be captured by an optical fiber disposed on the disk facing surface of the magnetic head or slider. The transmitted light of the magnetic disk may be detected.

In the case where the photodetector is mounted on the side of the magnetic head or slider facing the disk with the light receiving surface facing the disk surface of the magneto-optical disk, the magnetic head and the magnetic head can be easily aligned with each other. It is preferable to arrange a plurality of photodetectors around the main magnetic pole of the head at equal intervals. When the transmitted light of the magneto-optical disk is captured by an optical fiber, a plurality of optical fibers are arranged around the main magnetic pole of the magnetic head around the main magnetic pole in order to further facilitate the alignment between the optical head and the magnetic head. It is preferable to arrange the light receiving ends at equal intervals.

On the magnetic layer of the magneto-optical disk, a reflection layer generally made of metal or the like is laminated in order to increase the intensity of reflected light. However, even in the case of a magneto-optical disk having a reflective layer, a laser beam for recording / reproduction is transmitted by about several percent. Therefore, the magnetic head or the slider is provided with a photodetector, and by detecting the transmitted light from the magneto-optical disk, the relative position between the irradiation position of the laser beam spot and the magnetic head can be determined, and the setting of the magnetic head can be performed. Position adjustment can be facilitated. If a transparent or translucent dummy disk is used in place of the magneto-optical disk, the spot of the laser beam incident on the photodetector becomes clearer, so that the set position accuracy of the magnetic head can be further improved.

Fourth, in a magneto-optical disk drive in which an optical head and a magnetic head are arranged to face each other, a portion surrounding a main magnetic pole setting portion of a slider holding the magnetic head is positioned more than other portions of the slider. A high reflectivity portion having a high reflectivity of the laser beam emitted from the optical head is formed.

The optical head of the magneto-optical disk drive is provided with a photodetector for detecting a magneto-optical signal by receiving reflected light from the magneto-optical disk. Therefore, a high reflectivity portion is formed around the main magnetic pole setting portion of the slider, and the slider is irradiated with a laser beam emitted from the optical head while changing the setting position of the slider with respect to the optical head in various ways, and the reflected light is emitted. When detected by the photodetector provided in the optical head, the main magnetic pole setting portion of the magnetic head with respect to the optical axis of the optical head can be determined, so that the main magnetic pole of the magnetic head can be positioned on the optical axis of the optical head. it can.

Of course, in a magneto-optical disk device having such a photodetector or a magneto-optical disk device having a high reflectivity portion, a fine movement mechanism for adjusting the set position of the magnetic head with respect to the optical axis of the optical head. Can be provided.

On the other hand, as a method of adjusting the set position of the magnetic head with respect to the optical axis of the optical head, first, an optical head and a magnetic head held by an arm mechanism are provided. An external magnetic field of a predetermined intensity was applied to a magneto-optical disk device configured to be able to adjust a set position of the magnetic head with respect to an optical axis of the optical head by operating a mechanism while irradiating a laser beam at a reproduction level. When a magneto-optical disk having a magnetic layer whose magnetization direction is reversed to the direction of an external magnetic field is mounted, the magnetization reversal of the magneto-optical disk, detection of a reproduction signal output from the magnetization reversal unit, and operation of the fine movement mechanism are performed. The movement of the magnetic head is repeated, and the set position of the magnetic head matches the position where the reproduction signal output is maximized with respect to the direction of the external magnetic field. It was in the configuration referred to as a cell.

As the magneto-optical disk, a magnetic super-resolution type magneto-optical disk can be used. A magnetic super-resolution type magneto-optical disk is provided with three magnetic layers of a recording layer, a cutting layer, and a reproducing layer. When a reproduction-level laser beam is applied to the magneto-optical disk, the magnetization of the cutting layer disappears, the recording layer and the reproduction layer become magnetically independent, and the direction of the magnetization of the reproduction layer is changed by applying an external magnetic field. It can be reversed in the direction of the magnetic field. The magnetization of the reproduction layer is highest at the main magnetic pole position of the magnetic head, and the reproduction signal output from the optical head is proportional to the magnitude of the magnetization of the reproduction layer, so that the reproduction signal output becomes maximum with respect to the direction of the external magnetic field. By adjusting the setting position of the magnetic head as described above, it is possible to precisely oppose the main magnetic pole of the magnetic head to the optical axis of the optical head, no matter how small the main magnetic pole of the magnetic head is. Can be quickly and precisely adjusted.

In this case, the setting position of the magnetic head can be changed by operating a fine movement mechanism provided in the arm mechanism holding the magnetic head. Further, when determining the set position of the magnetic head, after specifying the position where the reproduction signal output becomes maximum with respect to the direction of the external magnetic field, the actuator for tracking control provided in the optical head is operated to The laser beam spot is equally scanned on the inner and outer circumferences around the track whose output is being detected, and is maintained at a position where the reproduction signal output is maximized with respect to the direction of the external magnetic field over a predetermined scan width. It is preferable to confirm that the operation is performed. With this configuration, the center of the peak of the external magnetic field (not a steep peak but a stable region corresponding to the size of the magnetic pole) matches the center of the track on which the reproduction signal output is detected. Can be easily known, so that the setting position of the magnetic head can be adjusted with higher precision.

Second, when an external magnetic field having a predetermined intensity is applied to a magneto-optical disk drive having an optical head and a plurality of magnetic heads while irradiating a laser beam at a reproduction level, the direction of the magnetization is changed to the external magnetic field. Mounting a magneto-optical disk having a magnetic layer that reverses the direction of the magnetic head, switching the magnetic heads to be driven one by one and repeating the magnetization reversal of the magneto-optical disk and the detection of the reproduction signal output from the magnetization reversal unit, A configuration is adopted in which a magnetic head that records a signal that maximizes the reproduction signal output with respect to the direction of the external magnetic field is selected.

In this case, since the moving operation of the magnetic head is not required, the adjustment of the set position of the magnetic head becomes easier.

Third, a magnetic head holding slider disposed opposite to the optical head is provided with a photodetector for detecting a laser beam emitted from the optical head, and a setting position of the slider with respect to the optical head is determined. A laser beam having a constant intensity is irradiated from the optical head while various changes are made, a change in an output signal from the photodetector is detected, and the magnetic head is set at a position where the output signal has a predetermined value. Was configured.

In this case, since the rotation drive of the magneto-optical disk and the detection of the reproduction signal output are not required, the adjustment of the set position of the magnetic head can be performed more easily.

Fourthly, a high-reflectance portion having a higher reflectivity for a laser beam emitted from the optical head than another portion is formed on a slider for holding a magnetic head disposed opposite to the optical head. While changing the setting position of the slider with respect to the optical head, the optical head irradiates a laser beam of a constant intensity from the optical head to detect a change in an output signal from a photodetector provided in the optical head. The magnetic head is set at a position at which a predetermined value is obtained.

Also in this case, since the rotation drive of the magneto-optical disk and the detection of the reproduction signal output are unnecessary, the adjustment of the set position of the magnetic head can be performed more easily.

In the third and fourth magnetic head setting position adjusting methods, the magnetic head can be moved by operating a fine movement mechanism provided in an arm mechanism holding the magnetic head. it can.

[0031]

BEST MODE FOR CARRYING OUT THE INVENTION

<First Embodiment of Magneto-Optical Disk Device> FIGS. 1 and 2 show a first embodiment of a magneto-optical disk device according to the present invention.
It will be described based on. FIG. 1 is a sectional view of a main part of the magneto-optical disk device of the present embodiment, and FIG. 2 is a plan view of a main part of the magneto-optical disk device of the present embodiment. As is apparent from these figures, the magneto-optical disk device of the present example has a fine movement mechanism for the magnetic head.
It is characterized by having a screw.

In FIGS. 1 and 2, reference numeral 10 denotes a magnetic head setting position adjusting unit, and reference numeral 11 denotes the setting position adjusting unit 1.
Reference numeral 12 denotes a first screw mounting plate erected on the upper surface of the base 11, reference numeral 13 denotes a gimbal spring mounting plate that slides in one direction along the upper surface of the base 11, and reference numeral 14 denotes an upper surface of the arm. A second screw mounting plate erected at
Reference numeral 16 denotes first and second screws as a fine movement mechanism, and other portions corresponding to the members shown in FIG. 6 described above are denoted by the same reference numerals.

The base 11 has a first screw mounting plate 1
2 and set the second screw 16 in a predetermined position on the side surface.
The arm 3 is slidably mounted on the upper surface of the arm 3. A second screw 16 rotatably mounted on a second screw mounting plate 14 is screwed into the screw hole 11 a formed in the base 11. Therefore, by rotating the second screw 16 forward or reverse,
The base 11 and thus the magnetic head 2 can be moved in the circumferential direction of the magneto-optical disk 7 (Y-Y direction in FIG. 2) by an amount proportional to the amount of rotation of the second screw 16.

The gimbal spring mounting plate 13 has a screw hole 13 a at a predetermined position on the side surface, into which the first screw 15 can be screwed, and is slidably mounted on the upper surface of the base 11. A first screw 15 rotatably mounted on the first screw mounting plate 12 is screwed into a screw hole 13 a formed in the gimbal spring mounting plate 13. Therefore, by rotating the first screw 15 forward or backward, the gimbal spring mounting plate 13 and thus the magnetic head 2 are moved to the magneto-optical disk 7.
The first screw 15 can be moved in the radial direction (the XX direction in FIGS. 1 and 2) by an amount proportional to the rotation amount of the first screw 15.

The first and second screws 15, 16
Can be operated manually or can be servo-controlled using an actuator such as a motor.

As described above, in the magneto-optical disk device according to the first embodiment, the arm 3 on which the optical head 1 and the magnetic head 2 are mounted is provided with the first and second screws 15 as fine movement mechanisms for the magnetic head 2. 16, the gimbal spring 5 is provided.
Since the magnetic head 2 can be easily moved by a desired minute distance in a desired direction as compared with a case where the set position of the magnetic head 2 is changed using the clearance of the screw insertion hole established in The main magnetic pole 2a of the magnetic head 2 can be quickly and accurately matched to the optical axis ZZ of the head 1.

In the magneto-optical disk drive of this embodiment, the arm 3 on which the optical head 1 and the magnetic head 2 are mounted is provided with first and second screws 15 and 1 as a mechanism for finely moving the magnetic head 2.
6, not only position adjustment of the optical head 1 and the magnetic head 2 at the time of manufacturing the magneto-optical disk device, but also
It is possible to cope with a case where the set positions of the optical head 1 and the magnetic head 2 are changed due to some cause during use.

In this embodiment, one screw for fine movement is provided in each direction, but two or more screws may be provided in each direction.

In this embodiment, the magnetic head 2 is configured to be individually movable in the radial direction and the circumferential direction of the magneto-optical disk 7.
By forming “a” into a shape in which one of the radial direction and the circumferential direction of the magneto-optical disk 7 is shorter and the other is longer, the fine movement mechanism in the direction in which the size of the main magnetic pole 2a is larger can be omitted. According to this, the magnetic head setting position adjusting unit 1
0 and the magnetic head 2 for the optical head 1
Can be further simplified.

<Second Embodiment of Magneto-Optical Disk Device>
A second embodiment of the magneto-optical disk drive according to the present invention
This will be described with reference to FIG. FIG. 3 is a plan view of a main part of the magneto-optical disk device of the present embodiment. As is clear from this figure,
In the magneto-optical disk drive of the present embodiment, as the fine movement mechanism of the magnetic head 2, the first and second piezo elements 17 and 18 and the power supply unit 1 for individually supplying a drive current to each of these piezo elements are provided.
9 is provided.

As shown in FIG. 3, the first and second piezo elements 17 and 18 are mounted on the inner surface of the arm 3 at a predetermined interval, and the other side of the piezo elements 17 and 18 is provided with a gimbal. The magnetic head 2 mounted on the slider 4 is attached via a spring 5. As the means for attaching the piezo elements 17 and 18 to the arm 3 and the means for attaching the gimbal spring 5 to the piezo elements 17 and 18, adhesion is particularly suitable because of the ease of construction and work.

The piezo elements 17 and 18 have electrodes formed on both front and back surfaces of a piezoelectric body. The distance between the electrodes can be enlarged or reduced by switching the polarity of the voltage applied to the electrodes. By adjusting the value of the voltage applied to the electrodes, the amount of change in the distance between the electrodes can be adjusted. Therefore, the first and second piezo elements 17,
By increasing or decreasing the distance between the electrodes 18 by the same amount, the gimbal spring 5 and thus the magnetic head 2
In the radial direction of the magneto-optical disk 7 (XX direction in FIG. 3).
Can be moved. Also, by increasing the distance between any one of the first and second piezo elements 17 and 18 and decreasing the distance between the other electrodes,
The gimbal spring 5 can be turned in the surface direction of the magneto-optical disk 7 around the mounting portion side of the piezo elements 17 and 18, and the magnetic head 2 is rotated in the circumferential direction of the magneto-optical disk 7 (FIG. 3).
(Y-Y direction).

The magneto-optical disk device of this embodiment has the same effects as the magneto-optical disk device according to the first embodiment, and also serves as a mechanism for finely moving the magnetic head 2 by supplying electric power from the power supply unit 19. Since the first and second piezo elements 17 and 18 to be operated are provided, the position of the magnetic head 2 with respect to the optical axis Z-Z of the optical head 1 can be adjusted with higher accuracy.

In the present embodiment, the piezo element is arranged only on one side of the gimbal spring 5, but the same as the magnetic head setting position adjusting unit 10 provided in the magneto-optical disk device of the first embodiment. The XY stage can be attached to the arm 3 and each stage constituting the XY stage can be driven by two sets of piezo elements arranged at right angles to each other.

<Third Embodiment of Magneto-Optical Disk Device>
A third embodiment of the magneto-optical disk drive according to the present invention
A description will be given based on FIG. FIG. 4 is a configuration diagram of a magnetic head device mounted on the magneto-optical disk device of the present embodiment. As is clear from this figure, the magneto-optical disk drive of this example
Instead of the configuration in which the arm is provided with the fine movement mechanism, a magnetic head device in which three magnetic heads 2A, 2B, and 2C are mounted on one slider 4 is provided.

As shown in FIG. 4, three magnetic heads 2
A, 2B and 2C are in the radial direction of the magneto-optical disk 7 (FIG. 4).
XX direction) and a circumferential direction (YY direction in FIG. 4), and are attached to one slider 4. Each of these magnetic heads 2A, 2B,
2C is connected to a head drive circuit 9 via a selector 8. By switching the selector 8, a magnetic head for performing a recording / reproducing operation is alternatively selected, and only the selected magnetic head is used for the head drive circuit 9. Independently driven by

In the magneto-optical disk drive of this embodiment, three magnetic heads 2 A, 2 B, 2 are provided at different positions on one slider 4.
C, and the magnetic heads 2A, 2B, and 2C can be selectively driven, so that recording and reproduction of signals on the magneto-optical disk 7 are repeated while sequentially changing the magnetic heads to be used, and the best recording is achieved. By selecting a magnetic head capable of exhibiting reproduction characteristics, the magnetic head 2 can be set with respect to the optical axis Z-Z of the optical head 1, so that it is unnecessary to adjust the position of the magnetic head 2 and the magneto-optical disk drive , And readjustment of the recording / reproducing sensitivity can be further facilitated.

In this embodiment, three magnetic heads are mounted on the slider 4. However, the number of magnetic heads is not limited at all, and may be two or four or more. You can also.

<Fourth Embodiment of Magneto-Optical Disk Device>
A fourth embodiment of the magneto-optical disk drive according to the present invention
A description will be given based on FIG. FIG. 5 is a configuration diagram of a magnetic head device mounted on the magneto-optical disk device of this example. As is clear from this figure, the magneto-optical disk drive of this example
As a magnetic head device, photodetectors 21a, 21b, which detect a laser beam 23 emitted from the optical head 1 to the disk-facing surface of the slider 4 and transmitted through the magneto-optical disk 7,
It is characterized by using the one provided with 21c and 21d.

As apparent from FIG. 5A, each of these photodetectors 21a to 21d is attached to the disk facing surface of the slider 4 with the light receiving surface facing the disk surface of the magneto-optical disk 7. 5B, these photodetectors 21a to 21d are equally arranged around the main pole 2a of the magnetic head 2 around the main pole 2a. The photodetectors 21a and 21b are arranged in the radial direction (XX direction in FIG. 5) of the magneto-optical disk 7, and the photodetectors 21c and 21d are arranged in the circumferential direction of the magneto-optical disk 7 (FIG. 5). (Y-Y direction).

The output signals of the photodetectors 21a and 21b are input to two input terminals of a first operational amplifier 24, and the output signal of the first operational amplifier 24 is input to a signal analyzer 26 such as an oscilloscope. Is done. On the other hand, the photodetector 21
The output signals of c and 21d are input to two input terminals of a second operational amplifier 25, and the output signal of the second operational amplifier 25 is input to a signal analyzer 26 such as an oscilloscope.

Therefore, the first embodiment or the second embodiment
By operating the fine movement mechanism as shown in the embodiment, the position of the magnetic head 2 with respect to the optical axis Z-Z of the optical head 1 is changed, and the slider is moved from the optical head 1 to the slider 4 via the magneto-optical disk 7. When the laser beam 23 is irradiated, a signal waveform as shown in FIG. Since each of the photodetectors 21a to 21d is equally disposed around the main magnetic pole 2a of the magnetic head 2, the optical axis ZZ of the optical head 1 is obtained from the signal waveform obtained by the signal analyzer 26. , The position (optimum position) where the main pole 2a of the magnetic head 2 matches can be determined. Therefore,
By operating the fine movement mechanism, the main magnetic pole 2a of the magnetic head 2 can be adjusted to the optimum position.

The magneto-optical disk device of this embodiment has the same effects as the magneto-optical disk device according to the first embodiment and the magneto-optical disk device according to the second embodiment, and the main magnetic pole 2 a of the magnetic head 2. Around four photodetectors 21a-
21d, the irradiation position of the laser beam 23 on the main magnetic pole 2a is determined from the change in the amount of light received by each of the photodetectors 21a to 21d.
It is not necessary to repeat recording and reproduction of a signal with respect to the optical head 1, and the setting of the magnetic head 2 with respect to the optical axis ZZ of the optical head 1 can be easily performed.

In this embodiment, four photodetectors 21a to 21a are arranged around the main magnetic pole 2a of the magnetic head 2.
d are arranged equally, but as shown in FIG.
, Only two photodetectors 21a and 21b can be disposed on both sides of the photodetector. In this case, two photodetectors 2
1a and 21b can be arranged in the radial direction of the magneto-optical disk 7 (the XX direction in FIG. 6), or can be arranged in the circumferential direction of the magneto-optical disk 7 (the YY direction in FIG. 6). it can.

In this embodiment, the photodetector is provided on the surface of the slider 4 facing the disk.
The sliders 1a and 21b can be disposed at any positions other than the disk facing surface of the slider 4. For example, as shown in FIG. 7, the photodetectors 21a and 21b are provided on the upper surface of the gimbal spring 5.
One end (light introduction end) is arranged on the surface of the slider 4 facing the disk, and the other end (light emission end) is provided with the photodetectors 21a, 2a.
The laser beam 23 applied to the disk-facing surface of the slider 4 can be detected by using the optical fiber 22 arranged toward the light-receiving surface of 1b. By doing so, the degree of freedom of the set position of the photodetector is expanded, so that the design of the magneto-optical disk device is facilitated, and the photodetectors 21a, 21a,
Since the protrusion 21b does not protrude, a required external magnetic field can be applied to the magneto-optical disk 7 without increasing the size of the magnetic head.

When the slider 4 is made of a transparent material, the photodetectors 21a and 21b are embedded in the slider 4 with the light receiving surface facing the disk facing surface as shown in FIG. Can also. In this case, since the photodetectors 21a and 21b do not protrude outside the disk-facing surface of the slider 4, it is possible to prevent the magnetic head from increasing in size.

Further, in the fourth embodiment, the photodetectors 21a and 21b are directly mounted on the disk-facing surface of the slider 4, but as shown in FIG. The devices 21a and 21b can be buried and their light receiving surfaces can be exposed toward the disk surface of the magneto-optical disk 7. Also in this case, since the photodetectors 21a and 21b do not protrude outside the disk facing surface of the slider 4, the size of the magnetic head can be prevented from increasing.

<Fifth Embodiment of Magneto-Optical Disk Device>
A fifth embodiment of the magneto-optical disk drive according to the present invention
A description will be given based on FIGS. 10 and 11. FIG. 10 is a plan view of the magnetic head device mounted on the magneto-optical disk device according to the present embodiment, as viewed from the disk-facing surface side. FIG. FIG. As evident from these figures,
The magneto-optical disk device of this example is a magnetic head device,
The main pole 2 of the magnetic head 2 is provided on the surface of the slider 4 facing the disk.
a having a high reflectivity portion 27 formed so as to surround the optical head 1 and detecting a change in the intensity of the reflected light from the slider 4 with the optical head 1 so that the magnetic force with respect to the optical axis Z-Z of the optical head 1 is increased. It is characterized in that the set position of the head 2 can be adjusted.

The high reflectivity portion 27 is made of a material such as gold, silver, or aluminum having a higher reflectivity of the laser beam 23 than a material forming the disk facing surface of the slider 4. Specifically, a thin film made of these high reflectivity materials is formed on a required portion of the slider 4 or a foil body made of these high reflectivity materials is adhered to a required portion of the slider 4. You. Further, as apparent from FIG. 10, the high reflectivity portion 27 has a substantially constant line width w and is formed concentrically with the main pole 2a.

As shown in FIG. 11A, the optical head 1 is provided with a photodetector 1b which receives reflected light from the magneto-optical disk and reproduces a recorded signal. Therefore, by operating the fine movement mechanism as described in the first embodiment or the second embodiment, the position of the magnetic head 2 with respect to the optical axis ZZ of the optical head 1 is changed while the optical head 1 is moved. When the slider 4 is irradiated with the laser beam 23 via the transparent or translucent dummy disk 7a and the reflected light is received by the photodetector 1b, the output end of the photodetector 1b is provided as shown in FIG. A signal with a complex waveform is generated. Since the high reflectance portion 27 has a substantially constant line width w and is formed concentrically with the main magnetic pole 2a, a signal waveform as shown in FIG. 11B is formed by a signal analyzer such as an oscilloscope. By detecting, a position (optimum position) where the main magnetic pole 2a of the magnetic head 2 coincides with the optical axis ZZ of the optical head 1 can be determined from the obtained signal waveform. Therefore, by operating the fine movement mechanism, the main magnetic pole 2a of the magnetic head 2 can be matched to the optimum position.

The magneto-optical disk drive of this embodiment has the same effects as the magneto-optical disk drive of the fourth embodiment, and is provided on the optical head 1 instead of providing a photodetector on the slider 4 side. Since the optimum position of the main magnetic pole 2a with respect to the optical axis ZZ of the optical head 1 is determined using the photodetector 1b, the configuration of the magneto-optical disk device can be further simplified.

Next, a method for adjusting the set position of the magnetic head with respect to the optical axis of the optical head will be described.

<First Embodiment of Adjusting Method> In the magnetic head setting position adjusting method of this example, a fine movement mechanism of the magnetic head is provided on the arm. The present invention relates to a method of adjusting a set position of a magnetic head with respect to an optical axis of an optical head by using a magneto-optical disk device having no high reflectivity portion (see FIGS. 1, 2, and 3). In the case of this example, the setting position of the magnetic head is adjusted by mounting a magnetic super-resolution type magneto-optical disk in the magneto-optical disk device.

The magnetic super-resolution type magneto-optical disk is shown in FIG.
As shown in FIG. 3, three magnetic layers of a recording layer 31, a cutting layer 32, and a reproducing layer 33 are provided on a substrate (not shown). The Curie temperature of the recording layer 31 is set to Tc ₃₁ ,
When the Curie temperature of the magnetic layer is Tc ₃₂ and the Curie temperature of the reproducing layer 33 is Tc ₃₃ , the Curie temperature of each magnetic layer is Tc ₃₂
It is adjusted so that <Tc ₃₁ <Tc ₃₃ . Also,
At room temperature, these magnetic layers are magnetically coupled, and the signal recorded on the recording layer 31 is transferred to the reproducing layer 33 via the cutting layer 32. Therefore, the reproduction layer 3
3 is a level at which information can be reproduced from the recording layer 31 and information is not recorded on the recording layer 31 (in this specification,
This is called "reproduction level". The recording layer 31 is irradiated by irradiating the magneto-optical disk 7 with the laser beam 34).
Can be reproduced. When the laser beam 34 at the reproduction level is irradiated to the magneto-optical disk, the magnetization of the cutting layer 32 disappears, and the recording layer 31 and the reproduction layer 3
3 are magnetically independent. When the magnetic head 2 is driven in this state and an external magnetic field H is applied to the magnetic layer, the cutting layer 32
Is higher than the Curie temperature Tc ₃₂ , the direction of magnetization of the reproducing layer 33 is reversed in the direction of the external magnetic field H.

As shown in FIG. 13, the magnetization of the reproducing layer is highest at a position corresponding to the outer peripheral edge of the main magnetic pole 2a, and slightly lower at a position α corresponding to the center of the main magnetic pole 2a. Further, the reproduction signal output of the optical head 1 is proportional to the magnitude of the magnetization of the reproduction layer 33. Therefore, the center of the main magnetic pole 2a of the magnetic head 2 is adjusted by adjusting the set position of the magnetic head 2 so that the reproduction signal output becomes a minimum value between two peaks with respect to the direction of the external magnetic field. Axis can be matched. In this case, the set position of the magnetic head 2 is adjusted by operating the screws 15 and 16 (see FIGS. 1 and 2) provided on the arm 3 or by connecting the piezo elements 17 and 18 provided on the arm 3 to the power supply unit. 19 (see FIG. 3).

The position β of the sub pole 2b of the magnetic head 2
, A magnetic field having a polarity opposite to that of the magnetic field generated from the main magnetic pole 2a is generated. It is preferable to adjust the set position of the magnetic head 2 while monitoring the polarity of the magnetic field so as not to confuse the opposite polarity magnetic field generator with the main magnetic pole position of the magnetic head 2. It is also effective to reduce the external magnetic field strength as much as possible to prevent confusion. As the external magnetic field H, a DC magnetic field or an AC magnetic field can be applied. As the magnetic super-resolution type magneto-optical disk, a recorded one or an unrecorded one can be used. When a recorded one is used, it is preferable to apply a high-frequency AC magnetic field as much as possible to avoid the influence of the magnetization of the recording layer 31. In addition, in this embodiment, the magneto-optical disk of the magnetic super-resolution type is used. Any magneto-optical disk can be used as long as it has a magnetic layer that reverses the direction of the magnetic field.

<Second Embodiment of Adjustment Method> In the magnetic head setting position adjustment method of this example, one slider is provided with a plurality of magnetic heads, and the arm is not provided with a fine movement mechanism for the magnetic head. Magneto-optical disk drive (see Fig. 4)
To select a magnetic head at an optimum position with respect to the optical axis of the optical head using Also in the case of this example, the setting position of the magnetic head is adjusted by mounting a magnetic super-resolution type magneto-optical disk in the magneto-optical disk device.

First, an external magnetic field H having a predetermined intensity is applied from the first magnetic head 2A while irradiating the mounted magnetic super-resolution type magneto-optical disk with the laser beam 34 at the reproduction level. Detect signal output. Then the second
An external magnetic field H of the same strength is applied from the magnetic head 2B of the first embodiment to detect a reproduced signal output. Further, an external magnetic field H having the same strength is applied also from the third magnetic head 2C, and a reproduction signal output is detected. Then, the magnetic head having the largest reproduction signal output is selected as the magnetic head set at the optimum position.

In the method of adjusting the set position of the magnetic head of this embodiment, it is not necessary to drive the magnetic head and the slider on which it is mounted relative to the optical head, so that the configuration of the magneto-optical disk drive can be simplified and A magnetic head located at an optimum position with respect to the optical axis Z-Z of the optical head 1 can be easily selected.

<Third Embodiment of Adjustment Method> In the method of adjusting the set position of the magnetic head of this embodiment, a fine movement mechanism of the magnetic head is provided on the arm, and a photodetector is provided on the slider on which the magnetic head is mounted. The present invention relates to a method for adjusting a setting position of a magnetic head with respect to an optical axis of an optical head by using a magneto-optical disk device (see FIGS. 5, 6, 7, 8, and 9). In the case of this example, since the information recording / reproducing operation is not performed, any magneto-optical disk other than the magnetic super-resolution type or a transparent or translucent dummy disk in place of the magneto-optical disk should be mounted on the magneto-optical disk device. Thus, the setting position of the magnetic head can be adjusted.

When a reproduction-level laser beam is emitted from the optical head 1, the laser beam is applied to the slider 4 via a magneto-optical disk or a transparent or translucent dummy disk instead. The amount of light received by each of the photodetectors 21a to 21d provided on the slider 4 varies depending on the irradiation position of the laser beam 23 on the slider 4.

Therefore, the fine movement mechanism illustrated in FIGS. 1 and 2 or the fine movement mechanism illustrated in FIG. 3 is operated to change the set position of the magnetic head 2 with respect to the optical axis ZZ of the optical head 1 while changing the optical position. A laser beam 23 is emitted from the head 1 to the slider 4 via the magneto-optical disk 7, and a change in the amount of light received by each of the photodetectors 21 a to 21 d is detected by a signal analyzer 26 such as an oscilloscope. And each photodetector 21 for the main pole 2a of the magnetic head 2
The position (optimum position) where the main magnetic pole 2a of the magnetic head 2 coincides with the optical axis ZZ of the optical head 1 can be determined from the relationship with the set positions a to 21d. Therefore, by operating the fine movement mechanism and making the main magnetic pole 2a of the magnetic head 2 coincide with the determined optimum position, the setting position of the magnetic head can be adjusted with high accuracy.

<Fourth Embodiment of Adjustment Method> In the magnetic head setting position adjustment method of this example, the arm is provided with a fine movement mechanism for the magnetic head, and the slider on which the magnetic head is mounted is provided with a high reflectivity portion. Magneto-optical disk drive (FIG. 10,
FIG. 11) to adjust the set position of the magnetic head with respect to the optical axis of the optical head. Also in the case of this example, since the information recording / reproducing operation is not performed, the setting position of the magnetic head is adjusted by mounting a transparent or translucent dummy disk instead of the magneto-optical disk in the magneto-optical disk device. Can be.

When a reproduction-level laser beam is emitted from the optical head 1, the laser beam is applied to the slider 4 via a transparent or translucent dummy disk, and the reflected light is reflected by a photodetector provided on the optical head 1. 1b. The amount of light received by the photodetector 1b varies depending on the irradiation position of the laser beam 23 on the slider 4.

Therefore, the fine movement mechanism illustrated in FIGS. 1 and 2 or the fine movement mechanism illustrated in FIG. 3 is operated to change the set position of the magnetic head 2 with respect to the optical axis ZZ of the optical head 1 while changing the optical position. A laser beam 23 is emitted from the head 1 to the slider 4 via the dummy disk 7a, and a change in the amount of light received by the photodetector 1b is detected by a signal analyzer such as an oscilloscope. The position (optimum position) where the main pole 2a of the magnetic head 2 coincides with the optical axis ZZ of the optical head 1 can be determined from the relationship between the position of the high reflectance portion 27 and the position of the main magnetic pole 2a. Therefore, by operating the fine movement mechanism and making the main magnetic pole 2a of the magnetic head 2 coincide with the determined optimum position, the setting position of the magnetic head can be adjusted with high accuracy.

In the magnetic head set position adjusting method according to the first and second embodiments, after the set position of the magnetic head is specified, the actuator for tracking control provided in the optical head 1 is operated. The laser beam 23 emitted from the optical head 1 is equally scanned on the inner and outer peripheral sides of the disk, and is maintained at a position where the reproduction signal output is maximized with respect to the direction of the external magnetic field over a predetermined scan width. It is preferable to confirm that the operation is performed. With this configuration, it is possible to easily know whether or not the center of the peak of the external magnetic field matches the center of the track for which the detection of the reproduction signal output is performed. Adjustments can be made.

[0077]

As described above, according to the first aspect of the present invention, the arm mechanism for holding the magnetic head is provided with the fine movement mechanism for adjusting the set position of the magnetic head with respect to the optical axis of the optical head. Therefore, the position of the magnetic head can be adjusted quickly and with high precision compared to the case where the set position of the magnetic head is adjusted using the clearance of the screw insertion hole provided in the gimbal spring. Can be easily assembled or maintained.

According to the second aspect of the present invention, since the screw is provided as the fine movement mechanism of the magnetic head, the structure of the fine movement mechanism and the structure of the magneto-optical disk device can be simplified.

According to the third aspect of the present invention, since the piezo element and the drive power source for driving the piezo element are provided as the fine movement mechanism of the magnetic head, the moving amount of the magnetic head can be electrically controlled. The position control of the magnetic head can be controlled with high precision.

According to the fourth aspect of the present invention, since a plurality of magnetic heads are provided adjacent to one slider, a magnetic head having the best recording / reproducing characteristics can be selected by selecting the magnetic head having the best recording / reproducing characteristics. Since the setting of the magnetic head can be completed and the setting position of the magnetic head does not need to be adjusted each time, assembly or maintenance of the magneto-optical disk device can be more easily performed.

According to the fifth aspect of the present invention, since the slider is provided with the photodetector for detecting the laser beam, the disk mounted on the magneto-optical disk drive is not driven to rotate, and the optical head with respect to the optical axis of the optical head is rotated. The optimum position of the magnetic head can be determined, and the position of the magnetic head can be easily and accurately adjusted.

According to the sixth aspect of the present invention, since the photodetector is provided on the disk-facing surface of the slider, the laser beam radiated on the disk-facing surface of the slider can be directly incident on the optical fiber. Since no light introducing means is required, the configuration of the magnetic head device and hence the configuration of the magneto-optical disk device can be simplified.

According to the seventh aspect of the present invention, since the photodetectors are equally spaced around the main pole of the magnetic head, the optimum position of the main pole can be easily determined from the obtained signal waveform. The adjustment of the set position of the magnetic head can be facilitated.

According to the eighth aspect of the present invention, since the laser beam irradiated on the disk-facing surface of the slider is received by the photodetector using the optical fiber, the degree of freedom of the set position of the photodetector is increased. be able to.

According to the ninth aspect of the present invention, since one end of the optical fiber is equally disposed around the main magnetic pole of the magnetic head, the optimum position of the main magnetic pole can be easily determined from the obtained signal waveform. The adjustment of the set position of the magnetic head can be facilitated.

According to the tenth aspect of the present invention, since the fine movement mechanism of the magnetic head is provided in the arm mechanism, the adjustment of the set position of the magnetic head can be performed easily and with high precision.

According to the eleventh aspect of the present invention, a high reflectivity portion having a higher reflectivity of the laser beam than the other portions is formed on the slider, so that the optical head provided in the magneto-optical disk drive can be used. Thus, the optimum position of the magnetic head can be determined, and the configuration of the magneto-optical disk device can be simplified. Further, since the optimum position of the magnetic head with respect to the optical axis of the optical head can be determined without rotating the disk mounted on the magneto-optical disk device, the position adjustment of the magnetic head can be performed easily and with high accuracy. .

According to the twelfth aspect of the present invention, since the set position of the magnetic head is adjusted using the reproduction signal output from the magneto-optical disk, the main magnetic pole of the magnetic head can be raised with respect to the optical axis of the optical head. Accuracy can be matched. Further, since the signal is recorded by irradiating the magneto-optical disk with the laser beam at the reproduction level, the previously recorded signal is not destroyed. Further, since the fine movement mechanism is provided in the arm mechanism of the magneto-optical disk device and the setting position of the magnetic head is adjusted by operating the fine movement mechanism, not only the assembly of the magneto-optical disk device is facilitated, but also the maintenance is facilitated. can do.

According to the thirteenth aspect of the present invention, even when the tracking control actuator is operated during the recording / reproducing operation, the optimum recording / reproducing characteristics can be guaranteed, so that the reliability of the magneto-optical disk can be improved. Can be more enhanced.

According to the fourteenth aspect, the main magnetic pole of the magnetic head can be set to the optimum position without moving the magnetic head, so that the adjustment of the set position of the magnetic head can be facilitated.

According to the fifteenth aspect of the present invention, a magneto-optical disk of a magnetic super-resolution type capable of recording a minute magnetization domain in a reproducing layer is used as the magneto-optical disk. Setting accuracy can be further improved.

According to the sixteenth aspect of the present invention, the setting position adjustment of the magnetic head with respect to the optical axis of the optical head is performed using the slider provided with the photodetector. Is unnecessary, and setting adjustment of the magnetic head with respect to the optical axis of the optical head can be further facilitated.

According to the seventeenth aspect of the present invention, since the setting position of the magnetic head with respect to the optical axis of the optical head is adjusted using the slider having the high reflectivity portion, the signal recording / reproducing operation for the magneto-optical disk is performed. Is unnecessary, and setting adjustment of the magnetic head with respect to the optical axis of the optical head can be further facilitated. Further, since the setting position of the magnetic head with respect to the optical axis of the optical head is adjusted using the photodetector provided in the optical head, the configuration of the magneto-optical disk device can be simplified.

According to the eighteenth aspect of the present invention, the magnetic head is driven by operating the fine movement mechanism provided in the arm mechanism. Therefore, the magnetic head is driven by utilizing the clearance of the screw insertion hole formed in the gimbal spring. The position adjustment of the magnetic head can be performed quickly and with high precision as compared with the case where the set position is adjusted.

[Brief description of the drawings]

FIG. 1 is a sectional view of a main part of a magneto-optical disk device according to a first embodiment.

FIG. 2 is a plan view of a main part of the magneto-optical disk device according to the first embodiment.

FIG. 3 is a plan view of a main part of a magneto-optical disk device according to a second embodiment.

FIG. 4 is a configuration diagram of a magnetic head device mounted on a magneto-optical disk device according to a third embodiment.

FIG. 5 is a configuration diagram of a magnetic head device mounted on a magneto-optical disk device according to a fourth embodiment.

FIG. 6 is a configuration diagram of another magnetic head device showing a modification of the magneto-optical disk device according to the fourth embodiment.

FIG. 7 is a configuration diagram of still another magnetic head device showing a modification of the magneto-optical disk device according to the fourth embodiment.

FIG. 8 is a configuration diagram of still another magnetic head device showing a modification of the magneto-optical disk device according to the fourth embodiment.

FIG. 9 is a configuration diagram of still another magnetic head device showing a modification of the magneto-optical disk device according to the fourth embodiment.

FIG. 10 is a plan view of a magnetic head device mounted on a magneto-optical disk device according to a fifth embodiment.

FIG. 11 is an explanatory diagram showing the principle of a method for adjusting a set position of a magnetic head in a magneto-optical disk device according to a fifth embodiment.

FIG. 12 is an explanatory diagram of a magnetic super-resolution type magneto-optical disk.

FIG. 13 is a graph showing a distribution of a magnetic field applied from a magnetic head.

FIG. 14 is a sectional view of a main part of a magneto-optical disk device according to a conventional example.

[Explanation of symbols]

 Reference Signs List 1 optical head 1a objective lens 2, 2A, 2B, 2C magnetic head 2a main magnetic pole of magnetic head 2b sub magnetic pole of magnetic head 3 arm 4 slider 5 gimbal spring 6 screw 7 magneto-optical disk 7a dummy disk 11 base 12 first screw Mounting plate 13 Gimbal spring mounting plate 14 First screw mounting plate 15, 16 Screw (fine movement mechanism) 17, 18 Piezo element (fine movement mechanism) 21a to 21d Photodetector 22 Optical fiber 23 Laser beam 31 Recording layer 32 Cutting layer 33 Reproduction layer

Claims (18)

[Claims] 1. An optical head for converging a laser beam spot on a magnetic layer of the magneto-optical disk and a magnetic head for applying an external magnetic field to the magnetic layer are disposed on opposite sides of the magneto-optical disk on both sides thereof. In the magneto-optical disk drive, the arm mechanism for holding the magnetic head and the optical head is provided with a fine movement mechanism for adjusting a set position of the magnetic head with respect to an optical axis of the optical head. Magneto-optical disk drive. 2. The magneto-optical disk drive according to claim 1, further comprising, as the fine movement mechanism, a screw that is rotatably attached to the arm mechanism and that drives a gimbal spring on which the magnetic head is mounted in one direction. A magneto-optical disk drive. 3. The magneto-optical disk drive according to claim 1, wherein the fine movement mechanism includes one or more piezo elements mounted between the arm mechanism and a gimbal spring on which the magnetic head is mounted. A drive power supply for extending or contracting the piezo element. 4. An optical head for converging a laser beam spot on a magnetic layer of the magneto-optical disk and a magnetic head for applying an external magnetic field to the magnetic layer are disposed on both sides of the magneto-optical disk with facing each other. A magneto-optical disk drive comprising: a plurality of magnetic heads mounted adjacent to one slider; and a head driving device capable of independently driving the plurality of magnetic heads. Magnetic disk drive. 5. A magneto-optical disk drive comprising an optical head and a magnetic head arranged opposite to each other, wherein a laser beam emitted from the optical head is irradiated around a main magnetic pole setting portion of a slider holding the magnetic head. A magneto-optical disk device comprising a photodetector for detection. 6. The magneto-optical disk device according to claim 5, wherein the photodetector is provided on a disk-facing surface of the slider with a light-receiving surface facing the optical head. apparatus. 7. The magneto-optical disk drive according to claim 5, wherein a plurality of the photodetectors are arranged at equal intervals around the main magnetic pole of the magnetic head around the main magnetic pole. Magneto-optical disk drive. 8. The magneto-optical disk drive according to claim 5, wherein one end of an optical fiber for taking in a laser beam emitted from the optical head is disposed on a disk facing surface of the slider, and the other end of the optical fiber is connected to the other end. A magneto-optical disk device, wherein the magneto-optical disk device is arranged to face a light receiving surface of the photodetector attached to a required portion. 9. The magneto-optical disk drive according to claim 5, wherein a plurality of laser beam inlets of the optical fiber are arranged at equal intervals around the main pole of the magnetic head around the main pole. A magneto-optical disk drive characterized in that: 10. The magneto-optical disk drive according to claim 5, wherein an arm mechanism for holding the magnetic head adjusts a set position of the magnetic head with respect to an optical axis of the optical head. A magneto-optical disk device provided with a fine movement mechanism. 11. A magneto-optical disk drive in which an optical head and a magnetic head are arranged to face each other, wherein the optical head is arranged around a main magnetic pole setting portion of a slider holding the magnetic head more than other portions of the slider. A magneto-optical disk device, wherein a high reflectivity portion having a high reflectivity for a laser beam emitted from a head is formed. 12. An optical head and a magnetic head held by an arm mechanism, and a set position of the magnetic head with respect to an optical axis of the optical head is adjusted by operating a fine movement mechanism provided in the arm mechanism. A magneto-optical disc device having a magnetic layer whose magnetization direction is reversed to the direction of the external magnetic field when an external magnetic field of a predetermined intensity is applied while irradiating a laser beam at a reproduction level to a magneto-optical disk device configured to Mounting, repeating the magnetization reversal of the magneto-optical disk, the detection of the reproduction signal output from the magnetization reversal unit, and the movement of the magnetic head by operating the fine movement mechanism,
A method for adjusting a set position of a head mechanism for a magneto-optical disk device, wherein the set position of the magnetic head is matched with a position at which the reproduction signal output is maximized with respect to the direction of the external magnetic field. 13. The adjusting method according to claim 12, wherein after specifying a position where the reproduction signal output is maximum with respect to the direction of the external magnetic field, an actuator for tracking control provided in the optical head is operated. The laser beam spot is equally scanned on the inner peripheral side and the outer peripheral side around the track where the reproduction signal output is detected, and the reproduction signal output is maximized with respect to the direction of the external magnetic field over a predetermined scan width. A method for adjusting a set position of a head mechanism for a magneto-optical disk device, comprising: confirming that the head mechanism is maintained at a position. 14. When a predetermined intensity of an external magnetic field is applied to a magneto-optical disk drive having an optical head and a plurality of magnetic heads while irradiating a reproduction-level laser beam, the direction of the magnetization is changed to the direction of the external magnetic field. A magneto-optical disk having a magnetic layer that reverses is mounted, and while switching the magnetic head to be driven one by one, the reversal of the magnetization reversal of the magneto-optical disk and the detection of the reproduction signal output from the magnetization reversal unit are repeated. A method of adjusting a set position of a head mechanism for a magneto-optical disk drive, comprising selecting a magnetic head that records a signal whose output is maximized with respect to the direction of the external magnetic field. 15. The setting position of a head mechanism for a magneto-optical disk device according to claim 12, wherein a magneto-optical disk of a magnetic super-resolution type is used as the magneto-optical disk. Adjustment method. 16. A slider for holding a magnetic head, which is disposed opposite to the optical head, includes a photodetector for detecting a laser beam emitted from the optical head, and variously changes the setting position of the slider with respect to the optical head. Irradiating a laser beam with a constant intensity from the optical head while detecting a change in an output signal from the photodetector, and setting the magnetic head at a position where the output signal has a predetermined value. A method for adjusting a set position of a head mechanism for a magneto-optical disk device. 17. A magnetic head holding slider disposed opposite to an optical head, wherein a high reflectivity portion is formed in which a reflectivity of a laser beam emitted from the optical head is higher than other portions. Irradiating a laser beam of a constant intensity from the optical head while variously changing the setting position of the slider with respect to the position of the slider to detect a change in an output signal from a photodetector provided in the optical head, and that the output signal is A method for adjusting a set position of a head mechanism for a magneto-optical disk device, wherein the magnetic head is set at a position having a determined value. 18. The adjustment method according to claim 16, wherein the setting position of the slider with respect to the optical head is changed by operating a fine movement mechanism provided in an arm mechanism that holds the magnetic head. A method for adjusting a set position of a head mechanism for a magneto-optical disk device.