JP2550844B2 - Magnetic head position adjusting method for magneto-optical head device - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic head position adjusting method for a magneto-optical head device, and more particularly to a magnetic head position adjusting method for a magneto-optical head device used in a magneto-optical recording device for overwriting by a magnetic field modulation method. Regarding

[0002]

2. Description of the Related Art A magnetic field modulation method is a magneto-optical recording method in which the intensity of laser light is kept constant and the direction of a magnetic field applied to a magneto-optical recording medium is modulated based on a recording signal. It is known that a modulating magnetic field is generated by modulating an exciting current flowing in a coil of a magnetic head).

However, since the magnetic field generated by the magnetic head needs to be modulated at a high speed, the coil has a low inductance, and the exciting current is a low current for low power consumption. Therefore, it is difficult to uniformly spread the intensity distribution of the magnetic field by the magnetic head, and the intensity of the magnetic field required to locally heat the magneto-optical recording medium by the laser beam to invert the magnetization of the recording film is It occurs only in a very small area near the magnetic head.

Therefore, conventionally, the position of the magnetic head is adjusted by the method described below with reference to FIG. 7 so that the irradiation position of the laser beam on the magneto-optical recording medium will be the optimum position of the magnetic field strength of the magnetic head. It was

In FIG. 7, reference numeral 1 is a magneto-optical disk, which is rotationally driven at a predetermined rotation speed (1800 to 3600 rpm) by a spindle motor (not shown). Reference numeral 2 denotes an objective lens, which is driven by an actuator (not shown) having an autofocus mechanism to focus laser light from a semiconductor laser (not shown) on the recording film of the magneto-optical disk 1. Three
Is a photodetector, which detects the reflected light from the magneto-optical disk 1.

Reference numeral 4 denotes a slider facing the objective lens 2 with the magneto-optical disk 1 interposed therebetween, and a head core having a gap facing the magneto-optical disk 1 is embedded in the surface facing the magneto-optical disk 1. A floating magnetic head is constructed which is floated from the disk surface by the air pressure generated by the rotation of the magneto-optical disk 1.

A load beam 5 supports the slider 4, and an elastic member (not shown) is arranged at one end of the load beam to urge the slider 4 in the -z direction. One end of the load beam 5 is supported by an arm 6 that is driven in xyz3 directions orthogonal to each other by a moving unit (not shown).

First, the magneto-optical disk 1 is rotated, and while irradiating the recording film of the magneto-optical disk 1 with a laser beam of about 8 mW, an exciting current according to a recording signal is passed through a coil of the magnetic head for recording. Then, replay the recorded part,
It is confirmed whether the reproduction signal obtained from the photodetector 3 is at the optimum level.

If the optimum level is obtained, one end of the load beam 5 is fixed to the head base on which the objective lens 2, the photodetector 3 and the like are arranged by adhesion, screwing or the like. If the optimum level is not obtained, the arm 6 is driven by the moving means, the slider 4 is moved in the x direction or the y direction by about several tens of μm, and then recording / reproduction is performed again to confirm the reproduction signal level. In this way, the slider 4 is moved until the optimum reproduction signal level is obtained, and the slider 4 (that is, the magnetic head) is cut and tried.
Adjust to the optimum position and fix.

[0010]

However, in the above method, recording and reproduction must be repeated until a reproduction signal of an optimum level is obtained, and there is a problem that adjustment requires a long time.

Therefore, there is disclosed a magnetic head position adjusting method using a magnetic head for a magnetic field modulation magneto-optical drive device having a light reflectance modulating portion corresponding to the magnetic field intensity on the magnetic field generating surface of the magnetic head. It is proposed by the official gazette. However, this method requires a magnetic head provided with a light reflectance modulation portion corresponding to the magnetic field strength on the magnetic field generation surface, and it is not easy to manufacture such a magnetic head.

It is an object of the present invention to provide a magnetic head position adjusting method for a magneto-optical head device which can easily realize a reduction in the magnetic head position adjusting time.

[0013]

The above problems can be solved by the following adjusting method.

That is, an optical head having a laser light source, an objective lens, and a photodetector, a slider provided with its air bearing surface facing the objective lens, and an exciting current modulated according to a recording signal are supplied. Yes and coils, the two boundary substantially parallel to the magnetic field generating surface becomes wound the coils to be in scan <br/> slider in the track formation direction is the floating upper surface substantially coplanar
A head core which is embedded so as to, in two magnetic head position adjusting method of the magneto-optical head device having a floating magnetic head having a gap formed by dividing the magnetic field generating surface, levitation magnetic substantially moved across the tracks of the head floating surface乃the laser beam from the record over laser light source
And <br/> irradiated with focus control so that a focal point in Itari磁 field generating surface, the two ends of the magnetic field generating surface, based on the reflected light from the levitation type magnetic head you incoming photodetector and edge position detecting step of detecting the position of the parts, and the position of the two ends has been detected
Based on the distance from the previously known end of the optimum magnetic field generation position of the magnetic field generating surface, the position to record laser light is irradiated substantially track formation direction to the outermost <br/> suitable field generating position the track direction setting step of setting the position, by moving the levitation type magnetic head to substantially track formation direction Les laser light floating top乃Itaru
Focus to focus in formic cap乃Itari磁 field generating plane
Irradiated with scan control, the gap position detection step of detecting a position of the two gaps on the basis of the reflected light from the levitation type magnetic head you coming to the photodetector, the detected two gears <br / > Tsu based on the position of the previously known two gaps were the optimum magnetic field generation position of the position and the magnetic field generation surface of the flop, setting the position to record laser light is irradiated to the optimum magnetic field generation position optimal a position setting step, is solved by a control method and a head fixing step of fixing the levitation type magnetic head with respect to the optical science head.

[0015]

According to the present invention having the above-mentioned structure, first, in the end position detecting step, the positions of two end portions in the track crossing direction of the magnetic field generation surface of the floating magnetic head are detected. Subsequently, in the track direction setting step, the position to be irradiated with the laser light is set to a position substantially in the track forming direction with respect to the optimum magnetic field generation position. Further, in the next gap position detecting step, the flying magnetic head is moved substantially in the track forming direction and the positions of the two gaps are detected.
Further, in the optimum position setting step, the position to be irradiated with the laser light is set to the optimum magnetic field generation position. Then, in the head fixing step, the floating magnetic head acts so as to be fixed to the optical head. in this way,
Check the positions of the two ends and the two gaps of the magnetic head.
The magnetic head sandwiched between the two gaps
Has two gaps because it can determine the center position
For the optical head of the magnetic head for the magneto-optical recording / reproducing apparatus
Positioning can be performed reliably.

[0016]

1 is a flow chart showing an embodiment of the present invention, and FIG. 2 is a diagram showing a magneto-optical disk device to which the embodiment of FIG. 1 is applied. In FIG. The same reference numerals are attached. First, the configuration of the magneto-optical head device will be described with reference to FIG.

The magneto-optical head device 7 shown in FIG. 2 has a structure similar to that described above, and is a flying magnetic head composed of a slider 4 and a head core not shown in FIG. , Optical head 8 of general configuration
And The optical head 8 includes a semiconductor laser 25 that is a laser light source, a photodetector 3, an actuator (not shown), an objective lens 2 that is driven by the actuator to converge the laser light to a predetermined position, and other optical components. And are disposed on the head base 9.

The slider 4 is made of ceramic and is polished, and the air bearing surface (lower surface in the figure) of the slider 4 is used for the objective lens 2.
And is supported by the load beam 5 in opposition to. An elastic member 10 is arranged at the right end of the load beam 5.

The right end portion of the elastic member 10 has a head base 9
It is configured to be fixed to the upper portion of the support portion 11 projecting in an L shape by, for example, bonding or screwing. The elastic member 10 urges the load beam 5 downward, but the lower limit position of the load beam 5 is regulated by a stopper 24 vertically projected on the head base 9.

At the time of recording or reproducing, a magneto-optical disk (hereinafter referred to as a disk) 1 is interposed between the optical head 8 and the slider 4 and is rotationally driven by a spindle motor (not shown). Then, due to the air pressure generated by the rotation, the slider 4 floats above the disk surface by a predetermined distance,
Recording or reproduction is performed in a state in which the surface has emerged.

Here, the structure of the conventional flying type magnetic head will be described with reference to FIG. FIG. 3 is an enlarged view of a part of the slider 4 in which the head core is embedded. In the figure, the upper surface is the air bearing surface. The x direction indicates the track width direction (radial direction of the disk 1), and the + y direction indicates the track forming direction.

A head core 13 made of MnZn-ferrite having gaps 12a and 12b formed on the upper surface thereof is embedded in the slider 4 so that the upper surface thereof is substantially flush with the air bearing surface of the slider 4. . Glass is filled in the gaps 12a and 12b and the three-way gaps (not shown) between the head core 13 and the slider 4. A coil 26 is wound around the rod-shaped portion 13b of the head core 13, and an exciting current modulated according to a recording signal is externally supplied to the coil 26 during recording.

The head core 13 generates a modulation magnetic field according to the exciting current, and, for example, the magnetic lines of force radiated from the upper surface of the U-shaped portion 13a to reach the upper surface of the rod-shaped portion 13b and the upper surface of the U-shaped portion 13c. The magnetic field lines reaching the upper surface of the rod-shaped portion 13b are generated. The directions of these lines of magnetic force are inverted depending on the direction of the exciting current, and the lines of magnetic force are perpendicular to the upper surfaces 29a, 29b, 29c (hereinafter referred to as magnetic field generating surfaces) of each part of the head core 13.

As described above, the recording film of the disk 1 facing the air bearing surface of the slider 4 with a distance according to the rotation speed is magnetized by being excited according to the modulation magnetic field from the magnetic field generating surfaces 29a, 29b, 29c. By reversing, the overwrite is performed.

However, due to the above-mentioned reasons, the magnetic field intensity distribution by the above-mentioned floating magnetic head is not uniform, and it is necessary to locally heat the magneto-optical recording medium by the laser beam to reverse the magnetization of the recording film. The area where the magnetic field strength is obtained is a minute area near the substantially central position (hereinafter referred to as the optimum magnetic field generation position) on the upper surface of the rod-shaped portion 13b.

Therefore, by using the magnetic head position adjusting device shown in FIG. 4, the position of the slider 4 with respect to the optical head 8 (that is, magnetic head position adjustment) is adjusted by the procedure shown in FIG. Is adjusted so as to irradiate the optimum magnetic field generation position on the upper surface of the rod portion 13b.

In the magnetic head position adjusting device 14, the base 16 on which the magneto-optical disk device 15 is mounted and the load beam 5 of the magneto-optical head device 7 are generally orthogonal to each other.
The driving unit 17 is configured to move in the z3 direction. In addition,
The drive unit 17 includes an arm 18 configured to hold one end of the load beam 5 and the arm 18 in the x direction,
It is composed of an x-axis stage 19, a y-axis stage 20, and a z-axis stage 21 which are driven in the y-direction and the z-direction.

While holding the load beam 5, the arm 18 is moved by a predetermined distance in the x-direction, the y-direction or the z-direction in response to a control signal coming from the outside to the drive unit 17. In addition, 22 is a spindle on which a disk (not shown) is mounted, and 23 is a spindle motor.

FIG. 5 is a diagram for explaining the moving direction of the slider 4 in the embodiment of FIG.
3 is shown in a perspective view from the same direction as FIG. 3, and the head core 13 is shown in a simplified and transparent manner.

A magnetic head position adjusting method according to an embodiment of the present invention will be described with reference to FIGS. The following magnetic head position adjusting method is applied to the magneto-optical disk device 15
This is performed with the optical head 8 of the magneto-optical head device 7 arranged in the position fixed.

First, the end portion (elastic member 10) of the load beam 5 is gripped while the disk 1 is ejected from the apparatus. Then, the z-axis stage 21 is driven to move the arm 18 in the z-axis direction so that the height of the air bearing surface of the slider 4 is adjusted to be substantially the same as the height of the recording layer of the disk 1 mounted. Further, at this time, the load beam is supported so that the air bearing surface of the magnetic head becomes substantially horizontal to the disk surface (step 30 in FIG. 1).

Next, the laser light from the laser light source which is originally controlled to be focused on the disk surface is focused on the air bearing surface of the slider 4 (step 31).

Subsequently, the x-axis stage 19 is driven to focus the laser light on the air bearing surface and move the arm 18 in the x-axis direction. That is, as shown in FIG. 5, the slider 4 is moved in the direction of the alternate long and short dash line arrow A so that the laser beam L reaches each surface from the air bearing surface of the slider 4 to the magnetic field generating surface 29a (upper surface in the figure) of the head core 13. Focus control is performed so that the laser beam L is irradiated in the track crossing direction so as to focus. The irradiated laser light L is reflected by the air bearing surface or the magnetic field generation surface 29a, and the reflected light RF is detected by the photodetector 3. As described above, the photodetector 3 shown in FIG.
Is detected based on the detection signal of
End position detection process).

FIG. 6A shows data obtained by measuring the detection signal of the photodetector 3 when the laser light L is irradiated from the air bearing surface of the slider 4 through the magnetic field generating surface 29a of the head core 13 in the A direction. Yes, the detection signal is converted into reflectance and shown on the vertical axis. The horizontal axis represents the moving distance of the slider 4.

In FIG. 6A, the moving distances X ₁ and X ₂ are
FIG. 5 shows the boundary positions between the air bearing surface of the slider 4 and the magnetic field generating surface 29a (upper surface) of the head core 13 shown by a and b. That is, as described above, since the gap between the slider 4 and the head core 13 is filled with glass, the reflectivity at the boundary positions a and b is the air bearing surface (left side from X ₁ and right side from X ₂ ) or the magnetic field. Generation surface 29a (X ₁ and X ₂
10% lower than (between) and).

As described above, the photodetector 3 detects the reflectance (the amount of reflected light is sufficient), and the position of the ends a and b in the track width direction of the magnetic field generating surface 29a of the head core 13 is detected from the change in the reflectance. To be done.

Returning to FIG. 1, when the positions of the ends a and b are detected, the track direction setting step of step 33 is subsequently executed.

That is, on the basis of the distance X in the x-axis direction from the end portion a of the optimum magnetic field generation position c of the magnetic field generation surface 29a of the head core 13 which is known by calculation or measurement in advance (end portion b). May be used as a reference), and the x-axis stage is adapted to irradiate the laser beam L to a position on the magnetic field generation surface 29a of the head core 13 indicated by d in the y-axis direction which is the track forming direction with respect to the optimum magnetic field generation position c. Move 19

This position d does not necessarily have to be on the magnetic field generating surface 29a of the head core 13, and the gap 12a with respect to the optimum magnetic field generating position c in the y-axis direction which is the track forming direction with respect to the optimum magnetic field generating position c. , 12b or some other position.

Subsequently, the gap position detecting step of step 34 is executed, and the y-axis stage 20 is driven to move the arm 18 in the y-axis direction while focusing the laser light on the air bearing surface. That is, as shown in FIG. 5, the slider 4 is moved in the direction of the alternate long and short dash line arrow B to move the laser light L from the air bearing surface of the slider 4 to the magnetic field generating surfaces 29a, 29b of the head core 13.
Irradiation is performed in the track forming direction until reaching 29c and the gaps 12a and 12b. The radiated laser light L is applied to the air bearing surface or the magnetic field generating surfaces 29a, 29b, 29c or the gap 12.
The reflected light RF reflected by a and 12b is detected by the photodetector 3. Then, the positions of the gaps 12a and 12b formed by dividing each magnetic field generating surface of the head core 13 are detected based on the detection signal of the photodetector 3 shown in FIG. 6B.

In FIG. 6B, the slider 4 is moved in the B direction so that the magnetic field generating surfaces 29a, 29b, 29c and the gaps 12a, 12 of the head core 13 are moved from the air bearing surface of the slider 4.
It is the data obtained by measuring the detection signal of the photodetector 3 when the laser beam L is irradiated to b, and the detection signal is converted to the reflectance and shown on the vertical axis. The horizontal axis represents the moving distance of the slider 4.

In FIG. 6B, the moving distances Y ₁ and Y ₂ are
The gaps 12a and 12b are shown. That is, since the gaps 12a and 12b are filled with glass as described above, the reflectances of the magnetic fields generating surfaces 29a (left side of Y ₁ ) and 29b of the head core 13 in both gaps are large.
(Between Y ₁ and Y ₂ ) and 29c (right side of Y ₂ ) are lower by 10% or more.

As described above, the photodetector 3 detects the reflectance (the amount of reflected light is sufficient), and the positions of the gaps 12a and 12b formed by dividing each magnetic field generating surface of the head core 13 from the change in the reflectance. Is detected.

Returning to FIG. 1, the gap 12 will be described.
When the positions of a and 12b are detected, then step 3
The optimum position setting step 5 is executed.

That is, based on the distance Y in the y-axis direction from the gap 12a of the optimum magnetic field generation position c of the magnetic field generation surface 29b of the head core 13 which has been calculated or measured in advance, the gap 12b is used as a reference. The y-axis stage 20 is driven to move the slider 4 in the B direction by a predetermined distance to move the laser beam L to the optimum magnetic field generation position c.
Is set to be irradiated.

When the irradiation position of the laser beam L is set to the optimum magnetic field generation position c as a result of the above step 35, the head fixing step of step 36 is executed, and as shown in FIG. The member 10) is adhered to the upper surface of the support 11 with the adhesive 27, and the floating magnetic head is fixed to the optical head 8. Alternatively, it may be fixed by screwing.

As described above, according to this embodiment, the head core 13 is embedded in the slider 4 without forming a light reflectance modulation portion corresponding to the magnetic field strength on each magnetic field generating surface of the magnetic head. For example, the magnetic head position of the flying magnetic head having the structure shown in FIG. 3 can be easily adjusted to a position where optimum recording can be performed.

The present invention can be applied to other than the flying type magnetic head having the structure shown in FIG. 3 in which three sides of the head core 13 are embedded in the slider 4, and at least two sides in the x direction and the y direction are sliders. Any structure embedded in 4 can be applied.

Further, in the above embodiment, the position of the end portion in the track width direction of the magnetic field generating surface 29a of the head core 13 is utilized by utilizing the fact that the portion filled with glass has a different reflectance from other portions. Although detected, for example, by making each magnetic field generation surface of the head core 13 rough so as not to affect the flying characteristics of the magnetic head, the reflectance of the air bearing surface of the slider 4 with respect to the reflectance thereof is increased. It is also conceivable that the position of the end portion is detected by configuring low. Further, step 32 and step 33 in FIG. 1 may be reversed.

[0050]

As described above, according to the present invention, according to the present invention, the magnetic heads
Position of two edges and two gaps
The center of the magnetic head sandwiched by two gaps due to
Since the position can be determined, the magneto-optical recording has two gaps.
Positioning of magnetic head for recording / playback device with respect to optical head
Having characteristics such as can be performed reliably.

[Brief description of drawings]

FIG. 1 is a flowchart of an embodiment of the present invention.

FIG. 2 is a diagram showing a magneto-optical disk device to which the embodiment of FIG. 1 is applied.

FIG. 3 is a diagram showing a floating magnetic head applied to the magneto-optical head device of FIG.

FIG. 4 is a diagram showing an example of a magnetic head position adjusting device used in the embodiment of FIG.

FIG. 5 is a diagram for explaining the embodiment of FIG.

FIG. 6 is a diagram showing measurement results of detection signals of the photodetector in the embodiment of FIG.

FIG. 7 is a diagram for explaining a conventional magnetic head position adjusting method.

[Explanation of symbols]

 1 Magneto-optical disk 2 Objective lens 3 Photo-detector 4 Slider 7 Magneto-optical head device 8 Optical head 12a, 12b Gap 13 Head core 25 Semiconductor laser 26 Coil 29a, 29b, 29c Magnetic field generation surface 32 End position detection step 33 Track direction setting Step 34 Gap position detection step 35 Optimal position setting step 36 Head fixing step a, b End c Optimal magnetic field generation position

Claims (1)

(57) [Claims] And 1. A laser light source, an objective lens, an optical head and an optical detector, slider and the modulated excitation current in accordance with a recording signal is arranged to face the objective lens to floating top And a magnetic field generating surface, which is formed by winding the coil, is made substantially flush with the air bearing surface, and two boundaries are formed substantially parallel to the slider in the track forming direction.
A head core which is embedded so as to have, in the magnetic head position adjusting method of the magneto-optical head device having a floating magnetic head having two gaps which are formed by dividing the magnetic field generating surface, the floating magnetic The head is moved substantially in the transverse direction of the track to irradiate the laser light from the laser light source while controlling the focus so that the laser light is focused on the air bearing surface or the magnetic field generating surface, and enters the photodetector. An end position detecting step of detecting the positions of two ends of the magnetic field generating surface based on the reflected light from the floating magnetic head, and the detected positions of the two ends and the magnetic field generating surface. A track direction in which the position to be irradiated with the laser light is set to a position substantially in the track forming direction with respect to the optimum magnetic field generation position based on the distance from the end of the optimum magnetic field generation position known in advance. In the setting step, the flying magnetic head is moved substantially in the track forming direction, and the laser light is focused and irradiated so as to focus on the air bearing surface, the gap, or the magnetic field generating surface. and a gap position detecting step for detecting a position of the two gaps on the basis of the reflected light from the floating magnetic head coming to the light detector, the magnetic field generating a detected position of the two gaps An optimum position setting step of setting a position to be irradiated with the laser beam to the optimum magnetic field generation position based on a position of the optimum magnetic field generation position of the surface from the previously known gap; magnetic head position adjusting method of the magneto-optical head apparatus; and a head fixing step of fixing to said optical head. "