JPH08235666A - Floating type magnetic head for magnetooptical disk - Google Patents

Abstract

PURPOSE: To stably acquire a large amount of floating of magnetic head while it is floated by providing, opposed to the disc surface, a slider of which floating surface is formed of a part of the cylinder surface of radius 500mm to 1500mm. CONSTITUTION: A slider 1 generates a load capacity of 1.2 to 1.3 times that of a flat slider with the minimum floating height of 5 to 15μm. As a result, when a cylindrical surface slider is used to acquire the amount of floating of 5μm or more, recording to a magneto-optical disc can be realized under the floating condition which is higher than the flat surface having the similar projection. Moreover, when a supporting spring is set so that the cylindrical surface slider and flat surface slider having the similar projection provides the same amount of floating, since the cylindrical surface slider can set a larger depressing force of the supporting spring than that of the flat surface slider, the slider which is stabile for disturbance during the floating condition can be designed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a floating magnetic head for a magneto-optical disk, and more particularly to a slider shape of the magnetic head.

[0002]

2. Description of the Related Art Magneto-optical disks record by utilizing the decrease in coercive force with respect to the temperature rise of a recording film. That is,
The temperature of the recording film is raised by irradiating the disk surface with a laser beam, and an external magnetic field is applied while the coercive force is lowered, thereby changing the magnetic domain of the recording film to perform recording. Generally,
The magnetic field generation unit that generates an external magnetic field employs an optical modulation method in which a static large magnetic field is used to generate a static magnetic field and recording is performed by blinking laser light. This optical modulation method has drawbacks such that overwriting cannot be performed at the time of recording and the recording density is limited by the focused diameter of the laser light.

In order to solve this drawback, a magnetic field modulation method has been proposed in which a small magnetic head is used in the magnetic field generating section to modulate an external magnetic field for recording on a magneto-optical disk. Since recording is performed by applying an external magnetic field modulated by a small magnetic head in a state where the temperature of the recording film is raised by laser light, overwriting can be performed at the time of recording. Further, since the recording density is determined by the converging diameter of the laser light and the magnetic field reversal speed, it is possible to perform higher density recording than the optical modulation method. A floating magnetic head has been proposed as this small magnetic head.

FIG. 8 is a perspective view showing a conventional flying type magnetic head disclosed in Japanese Patent Laid-Open No. 6-131839. In the figure, 11 is a slider part. This slider section 11
Has an air bearing surface 12 and a tapered portion 13. The air bearing surface 12 is made flat. The electromagnetic conversion unit 14 is the air bearing surface 1
It is attached to 2. The slider portion is supported by a support spring (not shown), and this support spring is used for the air bearing surface 1
2 generates a pressing force in a direction in which the disk is pressed against a disc (not shown).

The operation of the flying magnetic head will be described. When the disk is stopped, a pressing force perpendicular to the air bearing surface 12 applied by the support spring to the slider portion 11 as shown in FIG.
Are in contact with. When the disc rotates, air flows in between the disc surface and the tapered portion 13. The airflow flows along the tapered portion 13 between the air bearing surface 12 and the disk surface, and pressure is generated between the air bearing surface 12 and the disk surface. This pressure pushes up the air bearing surface 12 and the slider portion 11 floats. In the flying posture, the taper side of the air bearing surface facing the disk surface is flying higher than the opposite side of the air bearing surface, and the air flow is from the large side of the wedge-shaped gap between the disk surface and the air bearing surface. It flows into the small side. As a result, the airflow becomes higher in pressure as it approaches the opposite side of the air bearing surface to the tapered portion, and a force for stably flying the slider portion 11 is generated. This force is called the levitation force of the slider portion 11, and the value of this force is called the load capacity of the air bearing surface 12.

The flying height of the floating magnetic head is determined by the balance between the pressing force of the support spring and the load capacity of the floating surface 12. Further, the floating posture can balance the moment due to the pressure on the air bearing surface becoming higher as the pressure approaches the opposite side of the taper portion, and the spring force of the support spring. When the flying posture is parallel to the air bearing surface and the disk surface, and when the opposite side of the taper portion of the air bearing surface facing the disk surface flies significantly, the load capacity is insufficient and the floating magnetic head collides with the disk surface. For this reason, in the floating magnetic head, the support spring is set so that the attitude of the flying surface is larger on the taper side of the air bearing surface facing the disk surface than on the opposite side of the air bearing surface.

In the magneto-optical disk device, the magneto-optical disk is detachably mounted so that it can be exchanged. Therefore, in consideration of the adhesion of dust on the disk surface, the flying type magnetic head is required to ensure the sliding resistance of the disk-to-floating type magnetic head. It is necessary to increase the flying height of the head. Therefore, in this example, the flying height is made flat to secure a high flying height.

[0008]

In the magneto-optical disk apparatus, it is necessary to reduce the rotational speed of the disk in order to achieve high-density recording / reproduction, and as a result, the relative speed between the floating magnetic head and the disk surface is reduced. descend. Therefore, since the floating magnetic head having the conventional structure is configured as described above, there is a problem that the load capacity is not always sufficient and it cannot be used at a low relative speed. That is, when a high flying height cannot be secured and dust adheres to the disk surface, it causes contact with the slider, damages the disk surface, and cannot secure reliability of the disk. In order to secure the load capacity with this structure, it is necessary to increase the air bearing surface, which limits the movable range of the flying magnetic head on the disk surface, and limits the recordable / reproducible range of the disk surface. Dots occur. Further, if the air bearing surface is increased, the size of the flying magnetic head increases, and the mass of the flying magnetic head increases. As a result, when a shock is applied to the magneto-optical disk device, the floating magnetic head is greatly shaken and collides with the disk surface, so that the reliability of the disk cannot be ensured.

On the other hand, even if the pushing force of the support spring is reduced without changing the size of the air bearing surface, a high flying height can be obtained, but this is because the pushing force of the support spring is reduced when the load capacity is reduced. Therefore, the balance will be maintained and it will be easily affected by disturbance. That is, there is a problem in that the followability to the waviness of the disk is deteriorated, and when a shock is applied to the device, this force cannot be absorbed and the disk collides with the disk surface.

The present invention has been made in order to solve the above problems caused by the decrease in the relative speed between the disk and the slider, and provides a slider which can obtain a large load capacity without increasing the slider shape. An object of the present invention is to provide a floating magnetic head for a magneto-optical disk having the same.

[0011]

In order to explain the present invention, the terminology indicating each part of the floating magnetic head for a magneto-optical disk of the present invention will be described with reference to FIGS. 1, 4 and 7. FIG. 1 is a perspective view of a slider of a flying magnetic head. In FIG. 1, 1 is a slider, 2 is a slider 1.
The magnetic head 3 installed on the slider is the air bearing surface of the slider 1. The direction in which the air flow enters is indicated by an arrow in the figure. Among the respective sides of the air bearing surface 3, the side into which the air flow is introduced is the air inflow side 4,
The side from which the air flow flows is called the air outflow side 5. In the present invention, the air inflow side 4 and the air outflow side 5 are straight lines.
The remaining two sides of the air bearing surface 3 are the direction of air flow lubrication,
These two sides are called air lubrication sides 6. FIG. 4 is a side view of the slider showing the attitude of the slider during flying, and the same parts in FIG. 1 are designated by the same numbers. In FIG. 4, 7 is a disk, and 8
Is a disk surface facing the air bearing surface 3 of the slider 1.
The pitch angle of the slider means the air inflow side 4 and the air outflow side 5
It is an angle 9 formed by the plane including the disk and the disk surface 8. 7 is a slider side view showing the attitude of the slider at the time of flying, like FIG. 4, and the same parts in FIG. 4 are indicated by the same numbers. Reference numeral 10 is a tangential plane at the air outflow side 5 of the air bearing surface 3.

The floating magnetic head for a magneto-optical disk according to claim 1 of the present invention has a radius 500 such that the air-lubricated surface of the air-bearing surface arranged facing the disk surface is an arc.
It has a slider formed by a part of a cylindrical surface of mm to 1500 mm.

According to a second aspect of the present invention, there is provided a floating magnetic head for a magneto-optical disk, wherein the slider has a pitch angle when the slider floats when the tangential plane at the air outflow side of the air bearing surface is parallel to the disk surface. The pitch angle is set within ± 0.5 mrad.

A floating magnetic head for a magneto-optical disk according to a third aspect of the present invention is installed such that the gap of the magnetic head is close to the air outflow side of the air bearing surface.

According to a fourth aspect of the present invention, there is provided a floating magnetic head for a magneto-optical disk, wherein an air inflow side of an air bearing surface is longer than an air lubrication side.

In the floating magnetic head for a magneto-optical disk according to a fifth aspect of the present invention, the air bearing surface has a radius of curvature at each point of the air lubrication side of 500 mm to 1500 mm, and in a direction orthogonal to the air lubrication side. It is a stretched shape.

According to a sixth aspect of the present invention, there is provided a floating magnetic head for a magneto-optical disk, wherein a pitch angle of the slider when flying is such that a tangential plane at an air outflow side of the air bearing surface is parallel to the disk surface. Plus or minus 0.5 mra
It is set to be within d.

A floating magnetic head for a magneto-optical disk according to a seventh aspect of the present invention is installed such that the gap of the magnetic head is close to the air outflow side of the air bearing surface.

The floating magnetic head for a magneto-optical disk according to claim 8 of the present invention is such that the air inflow side of the air bearing surface is longer than the air lubrication side.

[0020]

In the floating magnetic head for a magneto-optical disk according to claim 1 of the present invention, a load capacity of about 1.2 times or more is generated as compared with a slider having a flat air bearing surface.

The floating magnetic head for a magneto-optical disk according to claim 2 of the present invention can be used in the vicinity of the maximum value of the load capacitance generated when the slider having the shape shown in claim 1 is used.

In the floating magnetic head for a magneto-optical disk according to claim 3 of the present invention, the magnetic head can be placed near the minimum flying position when the slider having the shape shown in claim 1 is floated.

In the floating magnetic head for a magneto-optical disk according to claim 4 of the present invention, the load capacity per unit area is larger than when the air lubrication side is longer than the air inflow side.

In the floating magnetic head for a magneto-optical disk according to the fifth aspect of the present invention, a load capacity of about 1.2 times or more is generated as compared with a slider having a flat air bearing surface.

In the floating magnetic head for a magneto-optical disk according to claim 6 of the present invention, it can be used near the maximum value of the load capacity generated when the slider shown in claim 5 is used.

In the floating magnetic head for a magneto-optical disk according to the seventh aspect of the present invention, the magnetic head can be placed near the minimum flying position when the slider having the shape shown in the fifth aspect is flying.

In the floating magnetic head for a magneto-optical disk according to claim 8 of the present invention, the load capacity per unit area is larger than when the air lubrication side is longer than the air inflow side.

[0028]

【Example】

Example 1. 1 is a perspective view showing a floating magnetic head for a magneto-optical disk according to a first embodiment of the present invention. In the figure, reference numeral 1 is a slider, and 2 is a magnetic head installed on the slider 1, which together with a support spring (not shown) constitutes a floating magnetic head. 3 is an air bearing surface of the slider, 4 is an air inflow side, 5 is an air outflow side, and 6 is an air lubrication side. Air enters the gap between the air bearing surface 3 of the slider 1 and the disk (not shown) from the air inflow side 4 and flows out from the air outflow side 5. The direction of this air flow is indicated by a white arrow. A levitation force for levitating the slider 1 is generated by this air flow. The value of this levitation force is called the load capacity of the air bearing surface 3. The flying attitude of the floating magnetic head of this embodiment is determined by the balance between the load capacity of the floating surface 3 and the pressing force of the support spring. In this embodiment, the air bearing surface 3 is formed so that the air-lubricated side 6 is a part of a cylindrical surface having an arc with a radius of 1000 mm. R1
000 Cylindrical surface slider. The length of the air inflow side 4 and the air outflow side 5 is called the slider width, and the length of the air lubrication side 6 is called the slider length. The slider of this embodiment has a slider width of 8
mm, slider length 6 mm. Since the cylindrical surface slider has a larger cylindrical surface radius than the slider width and slider length, the area of the air bearing surface is approximately the slider length in the vertical direction and approximately the rectangle of the slider width in the horizontal direction. This rectangle is called the projection of the slider.

The load capacity of the slider 1 will be described. Considering air as a viscous fluid, calculate according to the basic equation of fluid dynamics. The calculated load capacity of the slider 1 is compared with the load capacity of the plane slider having the same projection as the corresponding slider. Here, the flat slider is a slider whose air bearing surface is a flat surface. The relative speed between the slider and the disk is 3 m / sec.
FIG. 2 is a diagram showing the relationship between the minimum flying height and the load capacity ratio (ratio when the load capacity of the plane slider at the same flying time is 1). In the figure, the horizontal axis is the minimum flying height (unit: μm),
The vertical axis represents the ratio of the load capacity of the slider 1 to the load capacity of a plane slider having the same projection as the corresponding slider. In this way, the slider 1 generates 1.2 to 1.3 times as much load capacity as that of the flat slider at the minimum flying height of 5 to 15 μm. As a result, when securing a flying height of 5 μm or more,
When the cylindrical slider of this embodiment is used, it is possible to record on a magneto-optical disk in a flying state having a higher flying height than a flat slider having the same projection. If the support springs are set so that the cylindrical surface slider and the plane slider having the same projection have the same flying height, the pressing force of the supporting spring can be set larger for the cylindrical surface slider, so A stable slider can be designed.

In this embodiment, the R1000 cylindrical surface slider has been described, but the radius of the cylindrical surface is 500 to 1500.
If it is mm, it can be used for any purpose. FIG. 3 shows the result of calculation of the load capacity when the minimum flying height is 10 μm for a cylindrical slider whose radius is actually changed. The relative speed between the slider and the disk is 3 m / sec. In FIG. 3, the horizontal axis represents the radius of the cylindrical surface (unit: mm), and the vertical axis represents the load capacity of the slider 1 to the load capacity of a plane slider having the same projection as the corresponding slider. From FIG. 3, a cylindrical surface slider having a radius of 500 to 1500 mm generates a load capacity 1.2 times or more that of a plane slider of the same projection. In this calculation example, the case where the minimum flying height is 10 μm is shown, but almost the same results are obtained when the minimum flying height is 5 to 15 μm. From this fact, in the floating magnetic head that secures the minimum flying height of 5 μm or more, the radius is 500 to 1500 m.
It can be seen that a cylindrical surface slider of m is optimal.

The load capacity of the slider changes depending on its posture. The slider pitch angle and the minimum flying height that determine the attitude of the slider will be described with reference to FIG. FIG. 4 is a side view of the slider 1 when it is flying. Corresponding parts in FIG. FIG. 4 is a diagram for explaining the pitch angle of the cylindrical slider, which is viewed from the direction in which the air bearing surface 3 coincides with the air lubrication side 6. In the figure, 7 is a disk, and 8 is a disk surface facing the air bearing surface 3 of the slider 1. In FIG. 4, the air flow advances through the gap between the air bearing surface 3 and the disk surface 8 from the air inflow side 4 to the air outflow side 5. The angle 9 formed by the plane including the air inflow side 4 and the air outflow side 5 and the disk surface 8 in the flying posture of the slider 1 is called the slider pitch angle. The minimum value of the flying heights of the floating surface 3 with respect to the disk surface 8 is called the minimum flying height.

In the case of the R1000 cylindrical surface slider, FIG. 5 shows changes in load capacity with respect to the slider pitch angle when the relative velocity between the slider and the disk is 3 m / sec and the minimum flying height is 10 μm. In FIG. 5, the horizontal axis is the slider pitch angle (unit mrad), and the vertical axis is the ratio of the maximum load capacity of the slider to the load capacity at each pitch angle. This ratio is called the load capacity ratio. Applicable slider is 2.5
Since the maximum load capacity is shown in mrad, the vertical axis shows the ratio value to this value. From the graph of FIG. 5, it can be seen that the load capacity has a maximum around 2.5 mrad. Further, from the graph of FIG. 5, the rate of change of the load capacity with respect to the pitch angle of the slider changes gently at 2.5 mrad or more, which gives the maximum value. Especially slider pitch angle 3mr
In ad, the load capacity ratio is 0.98.

As a result of studying by changing the minimum flying height, it was found that the cylindrical surface slider has a maximum with respect to a change in pitch angle. Therefore, the pitch angle that maximizes the load capacity at each minimum flying height was calculated. The calculation result is shown in FIG. From FIG. 6, in the R1000 cylindrical surface slider, the load capacity becomes maximum when the slider pitch angle is 2.5 to 3 mrad. Further, at each minimum flying height, the rate of change of the load capacitance with respect to the pitch angle of the slider changes gently above the pitch angle that gives the maximum. In particular, the load capacity in the posture in which the pitch angle of the slider is 3 mrad is 97% or more of the maximum load capacity that can be generated with the minimum flying height, regardless of the value of the minimum flying height.

FIG. 7 is a side view of the slider, showing the attitude of the R1000 cylindrical surface slider at the time of flying. It should be noted that portions corresponding to those in FIG. 4 are denoted by the same reference numerals, and description thereof will be omitted. FIG. 7 is a side view seen from the direction in which the air bearing surface 3 coincides with the air-lubricated side 6. Reference numeral 10 is a tangential plane at the air outflow side 5 of the air bearing surface 3. In FIG. 7, the tangent plane 10 is parallel to the disk surface 8. The pitch angle of the slider at this time is calculated. When the slider is viewed from the direction shown in FIG. 7, the air inflow side 4, the air outflow side 5, and the center of the cylindrical surface form an isosceles triangle. This 2
Three points of an equilateral triangle, the center of the cylindrical surface is O, and the air inlet side 4
The point determined by is defined as A, and the point determined by the air outflow side 5 is defined as B.
At this time, the radius of the cylindrical surface is 1000 mm and the slider length is 6 mm.
Therefore, the triangle OAB has OA = OB = 1000, AB =
6 is an isosceles triangle. If the midpoint of AB is M, then 3
The angle OBM of the prismatic OBM is equal to the slider pitch angle.
Therefore, the slider pitch angle is arcsin ((6 /
2) / 1000) rad or 3 mrad. Conversely, when the slider pitch angle is 3 mrad, the tangent plane 1
0 becomes parallel to the disk surface 8.

In the R1000 cylindrical surface slider, the attitude that maximizes the load capacity was when the slider pitch angle was a value near 3 mrad, regardless of the minimum flying height. Therefore, it can be said that the posture in which the load capacity of the slider of this embodiment is almost maximized is when the pitch angle of the slider is such that the tangential plane 10 at the air outflow side 5 of the air bearing surface 3 is substantially parallel to the disk surface 8.

When the radius of the cylindrical surface slider was changed and calculated, the pitch angle of the slider during flying was found to be such that the tangential plane 10 at the air outflow side 5 of the air bearing surface 3 was the disk surface 8 regardless of the radius and its minimum flying height. The calculations show that the load capacity is almost maximum when it is parallel to.

As can be seen from FIG. 5, the maximum load capacity of the R1000 cylindrical surface slider is the maximum load capacity generated by this slider when the pitch angle of the slider during flying is set within 3 mrad plus or minus 0.5 mrad. The value is 95% or more of the load capacity. In other words, if the pitch angle of the slider during flying is set within plus or minus 0.5 mrad of the angle at which the tangent plane at the air outflow side of the air bearing surface is parallel to the disk surface, the load capacity of this slider is 9 of the maximum load capacity that can be generated
The value is 5% or more.

A similar study was conducted by changing the radius of the cylindrical slider. As a result, the pitch angle of the slider during flying was determined to be the angle at which the tangent plane at the air outflow side of the air bearing surface was parallel to the disk surface, regardless of the minimum flying height. Plus or minus 0.5m
It was found that the cylindrical surface slider can be used with a capacity of 95% or more of the maximum load capacity value by setting it so as to be within rad.

Therefore, when a flying magnetic head having a cylindrical slider is used, the pitch angle of the slider during flying is such that the tangential plane 10 at the air outflow side 5 of the flying surface 3 is parallel to the disk surface 8. Plus minus 0.5
By setting it within mrad, it is possible to generate a load capacity of 1.15 times or more as compared with a plane slider of the same projection.

As a result, in the cylindrical slider of the present embodiment, the pitch angle of the slider when flying is within ± 0.5 mrad of the angle at which the tangent plane at the air outflow side of the air bearing surface is parallel to the disk surface. When set, the magneto-optical disk can be recorded in a flying state with a high flying height, as compared with the case where the slider pitch angle is set to another value. Alternatively, when the support springs are set so as to have the same flying height, the pitch angle of the slider is within ± 0.5 mrad of the angle at which the tangential plane 10 on the air outflow side 5 of the air bearing surface 3 is parallel to the disk surface 8. When set so that the pressing force of the support spring can be set larger than when set to other values, it is possible to design a slider that is stable against disturbance during flying.

In the flying magnetic head of this embodiment, when flying, as shown in FIG. 7, the pitch angle of the slider is such that the tangential plane 10 at the air outflow side 5 of the flying surface 3 becomes substantially parallel to the disk surface 8. It is set to be an angle. In this posture, the flying height near the air outflow side 5 has the smallest flying height on the air bearing surface. When the gap of the magnetic head is provided close to the air outflow side 5, the gap of the magnetic head is installed at the portion of the air bearing surface 3 having the minimum flying height when flying. Since it is possible to efficiently record at a high frequency when the distance between the magnetic head gap and the disk surface is small, it is possible to perform high density recording on the disk by providing the magnetic head gap as in this embodiment. A floating magnetic head that secures a high flying height.

In the present embodiment, the cylindrical slider has been described, but the air-lubricated side of the slider air bearing surface is a curve having a radius of curvature of 500 to 1500 mm at each point, and the air-bearing surface is extended in a direction orthogonal to the air-lubricated side. It may be a slider having. A slider having an air bearing surface of this shape is called a substantially cylindrical surface slider. When the load capacity of the air bearing surface of the roughly cylindrical slider was calculated according to the basic equation of fluid dynamics, the same result as that of the cylindrical slider was obtained. That is, the load capacity of the substantially cylindrical slider was about 1.2 times the load capacity of the flat slider having the same projection.

The pitch angle of the roughly cylindrical surface slider is the angle formed by the plane including the air inflow side and the air outflow side and the disk surface, as in the case of the cylindrical surface slider. Even in a slider with a substantially cylindrical surface, the flying attitude that maximizes the load capacity is such that the slider pitch angle during flying is such that the tangent plane at the air outflow side of the air bearing surface is parallel to the disk surface. It was time. The effect of the slider pitch angle on the load capacity during flying was exactly the same as in the case of the cylindrical slider.

Therefore, it is advisable to set the mounting position of the support spring and the pressing force of the support spring so that the pitch angle of the slider when flying is such that the tangent plane at the air outflow side of the air bearing surface is substantially parallel to the disk surface. When the flying type magnetic head of the above-mentioned approximately cylindrical surface slider is used, it has a load capacity of 1.15 times or more as compared with a planar slider of the same projection, and therefore it can be set to have a higher flying height than the planar slider.

In the flying magnetic head having the cylindrical surface slider and the substantially cylindrical surface slider of this embodiment, the pitch angle of the slider during flying is such that the tangent plane at the air outflow side of the air bearing surface is substantially parallel to the disk surface. At this time, the flying height at the air outflow side 5 has the minimum flying height on the floating surface. Therefore, if the magnetic head is installed so that the gap of the magnetic head is close to the air outflow side 5, the gap of the magnetic head is close to the minimum flying height of the flying surface when the slider is flying.

The closer the gap of the magnetic head is to the disk surface, the higher the frequency at which data can be written on the disk, the less the spacing loss, and the more efficient high density recording becomes possible. If the magnetic head is installed so that the gap of the magnetic head is close to the air outflow side 5 as described above, high-density recording can be performed on the disk, and the flying type magnetic head ensures a high flying height.

Example 2. A second embodiment of the present invention will be described with reference to FIG. The description of each part in FIG. 1 has been described in the first embodiment, and will be omitted. In the present embodiment, as in the first embodiment, the air bearing surface 3 is formed so that the air-lubricated side 6 becomes a part of a cylindrical surface having a circular arc with a radius of 1500 mm. Further, in this embodiment, the slider width is designed to be longer than the slider length.

In order to study the effect of this embodiment, the load capacity of a slider having a slider width of 6 mm and a slider having a slider length of 8 mm and a slider having a slider width of 8 mm and a slider length of 6 mm are calculated according to the basic equation of fluid dynamics. In this calculation, the relative velocity between the slider and the disk was 3 m / s, and the minimum flying height of the air bearing surface was 10 μm. The pitch angle of the air bearing surface was such that the tangential plane near the air outflow side was parallel to the disk surface.

As a result of this calculation, the slider having a slider width of 6 mm and a slider length of 8 mm has a load capacity of 0.
28 mN / mm ² , and the slider having a slider width of 8 mm and a slider length of 6 mm has a load capacity of 0.3 per unit area.
It was 3 mN / mm ² .

From this calculation example, regarding the R1500 cylindrical surface slider, in the slider having the air bearing surface of the same area, the slider having the slider width set longer than the slider length has the slider width set shorter than the slider length. It can be seen that a larger load capacity is generated. In this calculation example, the case where the minimum flying height is 10 μm is shown, but when the minimum flying height is 5 to 15 μm, the slider having the slider width set longer than the slider length shows a larger load capacity. Therefore, by making the slider width longer than the slider length, a slider having a large load capacity can be obtained. As a result, the flying magnetic head having the slider of the present embodiment secures a high flying height during flying, and even when external disturbances such as vibrations are applied to the flying magnetic head,
It floats stably without touching the disc.

In this embodiment, the calculation results for the R1500 cylindrical surface slider are shown.
Regarding the 500 mm cylindrical surface slider and the approximately cylindrical surface slider as well, the slider having the air bearing surface with the slider width set longer than the slider length has a larger load capacity per unit area than the slider having the slider width set shorter than the slider length. The result of the calculation shows that is large. Therefore, R1
Not limited to the 500 cylindrical slider, if the air bearing surface is a cylindrical surface or a substantially cylindrical surface, the slider having a large load capacity can be obtained by making the slider width longer than the slider length. As a result, the flying magnetic head having the slider of this embodiment can stably secure a high flying height when flying.

[0052]

Since the present invention is constructed as described above, it has the following effects.

According to the floating magnetic head for a magneto-optical disk according to the first aspect of the present invention, a high flying height can be secured at the time of flying, and stable flying with respect to external disturbance becomes possible.

According to the levitation type magnetic head for magneto-optical disk of the second aspect of the present invention, since it is used in the vicinity of the maximum value of the load capacity generated when the present slider is used, a high levitation amount at the time of levitation. It is possible to secure stable and levitate stably against external disturbances.

According to the floating magnetic head for a magneto-optical disk according to claim 3 of the present invention, since the magnetic head is located near the minimum flying position during flying, spacing loss is small,
It is possible to record at a high frequency, and as a result, it is possible to record at high density on the disc.

According to the levitation type magnetic head for a magneto-optical disk of the fourth aspect of the present invention, a high levitation amount can be secured during levitation, and stable levitation with respect to external disturbance becomes possible.

According to the levitation type magnetic head for a magneto-optical disk according to the fifth aspect of the present invention, a high levitation amount can be secured during levitation, and stable levitation with respect to external disturbance is possible.

According to the flying type magnetic head for a magneto-optical disk of the sixth aspect of the present invention, it is used near the maximum value of the load capacitance generated when the present slider is used. As a result, the levitation type magnetic head of the present invention secures a high levitation amount during levitation and enables stable levitation against external disturbance.

According to the floating magnetic head for a magneto-optical disk according to claim 7 of the present invention, it is possible to record at a high frequency with little spacing loss, and as a result, it is possible to record at high density on the disk. Will be possible.

According to the levitation type magnetic head for magneto-optical disk of the eighth aspect of the present invention, a high levitation amount is ensured during levitation, and stable levitation against external disturbance becomes possible.

[Brief description of drawings]

FIG. 1 is a perspective view showing a floating magnetic head for a magneto-optical disk according to a first embodiment of the present invention.

FIG. 2 is a graph showing the relationship between the minimum flying height and the load capacity ratio (ratio when the load capacity of the flat slider is 1 when the same is flying).

FIG. 3 is a diagram showing a relationship between a radius of a cylindrical surface slider and a load capacity ratio (a ratio when the load capacity of a plane slider at the same flying time is 1).

FIG. 4 is a diagram for explaining a pitch angle of a cylindrical surface slider.

FIG. 5 is a diagram showing a relationship between a pitch angle of a slider and a load capacity ratio (a ratio of a load capacity at each pitch angle to a maximum load capacity of the present slider).

FIG. 6 is a diagram showing the relationship between the minimum flying height of a slider and the pitch angle indicating the maximum load capacity at each minimum flying height.

FIG. 7 is a side view of the slider showing the attitude of the R1000 cylindrical slider during floating.

FIG. 8 is a perspective view showing a conventional floating magnetic head.

[Explanation of symbols]

1 slider, 2 magnetic head, 3 air bearing surface, 4 air inflow side, 5 air outflow side, 6 air lubrication side, 7 disk, 8 disk surface, 9 pitch angle, 10 air contact surface tangent plane near air outflow side

Front page continuation (72) Inventor Naoyuki Egusa No. 1 Baba-Zou, Nagaokakyo-shi Video System Development Laboratory, Mitsubishi Electric Corporation

Claims (8)

[Claims] 1. A magneto-optical disk device having a floating magnetic head, comprising a slider having an air bearing surface facing the disk surface and formed by a part of a cylindrical surface having a radius of 500 mm to 1500 mm. Levitation type magnetic head for magneto-optical disk. 2. The pitch angle of the slider when flying is plus or minus 0.5 m of the pitch angle of the slider when the tangent plane at the air outflow side of the air bearing surface is parallel to the disk surface.
The flying magnetic head for a magneto-optical disk according to claim 1, wherein the flying magnetic head is set to be within rad. 3. The floating magnetic head for a magneto-optical disk according to claim 1, wherein the gap of the magnetic head is installed close to the air outflow side of the air bearing surface. 4. The floating magnetic head for a magneto-optical disk according to claim 1, wherein the air inflow side of the air bearing surface is longer than the air lubrication side. 5. In a magneto-optical disk device having a floating magnetic head, the air bearing surface has a radius of curvature at each point of the air lubrication side of 500 mm to 1500 mm, and
A flying magnetic head for a magneto-optical disk, which has a shape extended in a direction orthogonal to an air-lubricated side. 6. The flying pitch of the slider is set so as to be within ± 0.5 mrad of the pitch angle of the slider in which the tangent plane at the air outflow side of the flying surface is parallel to the disk surface. The floating magnetic head for a magneto-optical disk according to claim 5. 7. The floating magnetic head for a magneto-optical disk according to claim 5, wherein the gap of the magnetic head is installed close to the air outflow side of the air bearing surface. 8. The flying magnetic head for a magneto-optical disk according to claim 5, wherein the air inflow side of the air bearing surface is longer than the air lubrication side.