JP2642589B2 - Magnetic head, magnetic head device, and magnetic disk device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a magnetic head, a magnetic head device, and a magnetic disk device.

[0002]

2. Description of the Related Art As this type of magnetic head generally called a floating type magnetic head, for example, a Winchester type magnetic head, a composite type magnetic head, a thin film magnetic head or a MIG type magnetic head are known. The basic structure is such that a magnetic transducer is attached to a slider made of a ceramic structure.

When used as a magnetic disk drive,
The magnetic head is attached to the tip of the support spring (gimbal),
The slider's flying surface is placed so as to face the surface of the magnetic disk. When the magnetic disk is stationary, the floating surface is pressed against the surface of the magnetic disk by the spring pressure of the support spring, but when the magnetic disk rotates, lift dynamic pressure is generated on the floating surface of the slider. It floats with a floating amount that balances the pressure and the spring pressure of the support spring.

The magnetic heads proposed so far have a so-called taper. The magnetic head can be classified into a flat magnetic head and a magnetic head without a rail portion and a tapered portion. The former is the official gazette of Japanese Patent Publication No.
The slider has two rails, and the surface of these rails is an air bearing surface with high flatness, and further, a taper is formed on the air inflow end side of the rail. It has a profitable structure. The tapered portion is provided to increase the levitation pressure at the air inflow end, that is, the load capacity, and to stabilize the levitation posture and levitation traveling performance.

The latter is disclosed in, for example, Japanese Patent Application Laid-Open No. 64-21713. According to this prior art, since there is no tapered portion, the load capacity is reduced, and a magnetic head operating with a small gap can be realized. Therefore, it is suitable for reducing spacing loss and achieving high recording density. Further, it is suitable for miniaturization and mass production.

[0006]

Of the above two types of magnetic heads, the taper. Flat type magnetic heads
The dynamic characteristics such as translational vibration resistance and waviness resistance are relatively good, and the stability of the floating posture is also relatively good. However, since the rigidity of the air spring generated in the tapered portion increases, the load capacity on the air inflow end side increases. For this reason, the floating clearance with respect to the magnetic disk peripheral speed increases,
Spacing loss tends to increase. In addition, since the taper portion, the air bearing surface continuous with the taper portion, and the rail portion supporting these are required to be precisely machined, there is a tendency that machining cost increases and mass productivity decreases.

A magnetic head of a type having neither a rail nor a tapered portion on an air bearing surface is excellent in easiness of processing, miniaturization and mass productivity. However, since the load capacity of the air inflow end portion is small and the rigidity of the air spring is low, the floating posture tends to fluctuate on the air inflow end side. For this reason, there is a possibility that the translational vibration resistance and the followability to the undulation of the magnetic disk may be deteriorated. Further, the load capacity at both ends parallel to the air outflow direction may be reduced, and the seek rigidity may be reduced.

An object of the present invention is to provide a magnetic head which is suitable for achieving a high recording density and which is also suitable for miniaturization and mass production.

Another object of the present invention is to provide a magnetic head, a magnetic head device, and a magnetic disk which, when used in combination with a magnetic disk, have a stable flying attitude of the slider and excellent translational vibration resistance and tracking performance. It is to provide a device.

Still another object of the present invention is to provide a magnetic head, a magnetic head device, and a magnetic disk device capable of reducing fluctuation of a floating gap when a magnetic head seeks on a magnetic disk at high speed. is there.

Still another object of the present invention is to provide a magnetic head, a magnetic head device, and a magnetic disk device capable of controlling a roll angle of a slider and thereby stabilizing a flying posture.

[0012]

According to the present invention, there is provided a magnetic head including a slider and a magnetic transducer, wherein the slider has only one air bearing surface on one side. And wherein the air bearing surface includes a first surface, a second surface, and a third surface;
Surface constitutes one continuous plane, and the second surface
The third surface and the third surface are each equal to the length of the slider.
At the air inflow end located at one end
On both sides in the width direction, including the corners between the edges and the edges in the width direction
A part of the first surface is located between the two,
One, is formed to be lower than the first surface, and a final divided by the middle of the length direction of the slider, the magnetic conversion element is provided in the other end of said length.

A magnetic head device and a magnetic disk device according to the present invention include the above-described magnetic head.

[0014]

The slider is provided with a first air bearing surface.
Surface constitutes one continuous surface, so that the slider has no rail portion. Therefore, the basic structure is disclosed in
Similar to the magnetic head disclosed in Japanese Patent Application Laid-Open No. 4-21713, a magnetic head suitable for reducing spacing loss, achieving a high recording density, and suitable for miniaturization and mass production can be obtained.

Each of the second surface and the third surface constituting the air bearing surface is located at one end in the longitudinal direction of the slider.
At the air inlet end located, the air inlet edge and the width direction
Are provided on both sides in the width direction including the corners formed by the edges of the
Part of the first surface is located between the persons, and more than the first surface
It is formed so as to be lower , and ends in the middle of the length direction of the slider, and the magnetic transducer is provided at the other end side in the longitudinal direction, so when used in combination with the magnetic disk, the magnetic transducer becomes In a normal use mode in which the other end located is an air outflow end, an air bearing with the second surface and the third surface is formed on the air inflow end. This air bearing increases the load capacity on the air inflow side and increases the rigidity of the air film. Therefore, the flying attitude of the slider is stabilized, and the translational vibration resistance and the tracking performance are improved. As a result, it is possible to perform a read / write operation while stably maintaining a small floating gap of 0.1 μm or less, and combine with a magnetic disk having a high surface accuracy, for example, a magnetic disk using a glass substrate to achieve high-density recording. Thus, a large-capacity magnetic disk device can be realized. The translational vibration resistance characteristic is a characteristic that follows the flatness of the surface of the magnetic disk, and the tracking performance is a characteristic that follows the undulation existing on the surface of the magnetic disk.

Each of the second surface and the third surface is provided at one end in the length direction of the slider, and the magnetic transducer is provided at the other end in the length direction. Becomes larger at one end in the length direction of the slider on the air inflow end side, and becomes smaller at the other end in the length direction of the magnetic transducer. For this reason, even if the minute floating gap of 0.1 μm or less is maintained and the spacing loss is reduced, no head crash occurs.

Since the second surface and the third surface are separated from each other in the width direction by the first surface, the load capacity on both sides in the width direction increases. For this reason, it is possible to reduce the fluctuation of the flying gap when the magnetic head seeks on the magnetic disk at high speed.

The load capacitance generated on the second surface and the third surface can be adjusted by selecting the width or the length of the second surface and the third surface. Thereby, the roll angle of the slider can be controlled and the flying attitude can be adjusted.
For example, in combination with a magnetic disk, the load capacity on the inner and outer circumferences is adjusted by making the width of the recess on the outer circumference slightly smaller than the width of the recess on the inner circumference,
The roll angle of the slider can be reduced, and the flying attitude can be stabilized.

The present invention can be applied to almost all magnetic heads, for example, a Wenchester type magnetic head, a composite type magnetic head, a thin film magnetic head or a MIG type magnetic head.

[0020]

1 is a perspective view of a magnetic head according to the present invention, FIG. 2 is a front view of the magnetic head shown in FIG. 1, and FIG. 3 is a right side view of FIG. The magnetic head according to the present invention includes a slider 1
And a magnetic transducer 2. The slider 1 has a first surface 100, a second surface 102, and a third surface 103 on one surface side that is the medium facing surface A. First side 1
00 forms one continuous surface. Slider 1
Has a length L of 0.5 to 2.8 m along the air flow direction a.
m and a width W that is reduced to 0.5 to 2 mm can be used.

The second surface 110 and the third surface 120 are provided at one end of the slider 1 in the longitudinal direction. The length direction corresponds to the air flow direction a when combined with a magnetic disk (not shown). The second surface 110 and the third surface 120 are also provided on both sides in the width direction including a corner formed by one end edge in the length direction and the outer edge in the width direction, and end in the middle of the length direction. , The first surface 100 separates each other in the width direction. Second surface 110 and third surface 1
20 is selected such that the maximum depth from the first surface 100 to the bottom surface 111 is in the range of 0.1 to several tens μm. Such second surface 110 and third surface 120 can be easily formed by, for example, ion beam processing.

The second surface 110 has wall surfaces 112 and 113 between the first surface 100 and the bottom surface 111. The first wall surface 112 extends in the air flow direction a, and the second wall surface 113 extends in a width direction substantially orthogonal to the air flow direction a. Similarly, the third surface 120 has wall surfaces 122 and 123 between the first surface 100 and the bottom surface 121. The first wall surface 122 extends in the air flow direction a, and the second wall surface 123
And extends in a direction substantially perpendicular to the direction. Illustrated wall surface 112,
113, 122 and 123 are formed in a step shape.

The magnetic transducer 2 is provided on the other end face opposite to the air inflow end. The illustrated magnetic transducer 2 is an IC
Although a thin film element formed according to a process similar to the manufacturing technology is shown, it can be applied to almost all magnetic heads such as a Wenchester type magnetic head, a composite type magnetic head, and a MIG type magnetic head. Further, the magnetic conversion element 2 can include any of a magnetoresistive element and an inductive element.

FIG. 4 is a diagram showing a magnetic disk drive according to the present invention. The magnetic disk device includes a positioning device 3, a magnetic disk 4, a known head support device 5, and a magnetic head 6 according to the present invention. The magnetic disk 4 is driven to rotate in the direction of arrow a by a rotation drive mechanism (not shown). The positioning device 3 is of a rotary actuator type and supports one end of the head support device 5 and is driven at a predetermined angle on the surface of the magnetic disk 4 in the direction of the arrow b1 or b2. Thereby, on a given track,
Writing to and reading from the magnetic disk 4 is performed. The magnetic disk 4 has a surface roughness of, for example, 100
も の A substrate provided with a magnetic recording layer on a substrate having the following high surface properties can be used. A glass substrate can be given as an example of such a substrate.

FIG. 5 is a diagram for explaining the operation of the magnetic disk device shown in FIG. In the read / write operation, the head support device 5 supporting the magnetic head 6 is driven by the rotary actuator type positioning device 3 as if swinging in the directions of arrows b1 and b2 around the pivot center O1. The position of the magnetic head 6 on the magnetic disk 4 is usually represented by a skew angle.

FIG. 6 is a side view of the magnetic head device, and FIG. 7 is a bottom view of the same. In the head support device 5, a flexible body 52 also made of a thin metal plate is attached to a free end at one longitudinal end of a support body 51 made of a thin metal plate, and the magnetic head 6 is attached to the lower surface of the flexible body 52. It has a structure and applies a load force to the magnetic disk 4 to press the magnetic head 6.
The illustrated flexible body 52 includes two outer frames 521 and 522 extending substantially in parallel with the longitudinal axis of the support 51, and a horizontal frame connecting the outer frames 521 and 522 at an end remote from the support 51. 523 and a tongue-shaped piece 524 extending from a substantially central portion of the horizontal frame 523 so as to be substantially parallel to the outer frame portions 521 and 522 and having a free end at the tip.
One end opposite to the direction in which 23 is provided is attached near the free end of the support body 51 by means such as welding.

On the upper surface of the tongue-shaped piece 524 of the flexible body 52, for example, a hemispherical load projection 525 is provided. The load force is transmitted.

The magnetic head 6 is attached to the lower surface of the tongue piece 524 by means such as bonding. The magnetic head 6 has a length direction corresponding to the longitudinal direction of the head support device 5.
It is attached to the magnetic head support device 5. The head support device 5 applicable to the present invention is not limited to the above embodiment.
A head support device that has been proposed or may be proposed can be widely applied.

As described above, the first surface 1 of the slider 1
00 forms one continuous surface, so that the slider 1 has no rail. Therefore, when the magnetic disk device shown in FIGS. 4 to 7 is configured, a magnetic head suitable for reducing spacing loss, achieving high recording density, and suitable for miniaturization and mass production can be obtained.

In the slider 1, each of the second surface 110 and the third surface 120 constituting the air bearing surface is located at one end in the length direction of the slider 1 and is connected to one end edge in the length direction. On both sides in the width direction including a corner formed by the outer edge in the width direction, the lower surface is provided to be lower than the first surface 100, and ends in the middle of the length direction of the slider 1. Is provided on the other end in the length direction,
When used in combination with the magnetic disk 4, an air bearing is formed by the second surface 110 and the third surface 120 on the air inflow end side, the load capacity on the air inflow side is increased, and the rigidity of the air film is increased. Therefore, the flying posture of the slider 1 is stabilized, and the translational vibration resistance and the tracking performance are improved.

Each of the second surface 110 and the third surface 120 is provided at one end in the length direction of the slider 1, and the magnetic transducer 2 is provided at the other end in the length direction. Therefore, the flying gap g increases at one end in the length direction of the slider 1 on the air inflow end side, and decreases at the other end in the length direction where the magnetic transducer 2 is located. For this reason, 0.1 μm
Even if the following small floating gap is maintained and the spacing loss is reduced, no head crash occurs.

Since the second surface 110 and the third surface 120 are separated from each other in the width direction by the first surface 100, the load capacity on both sides in the width direction increases. For this reason, it is possible to reduce the fluctuation of the floating gap when the magnetic head 6 seeks on the magnetic disk 4 at high speed. Also, since the load capacity on both sides in the width direction increases,
The pitching rigidity increases, and the pitching amount decreases. Therefore, the flying posture is stabilized.

FIG. 8 is a diagram showing a floating pressure distribution on a line passing through the second surface 110 or the third surface 120 and taken in the longitudinal direction in the magnetic disk drive shown in FIGS. It is. As shown, the levitation pressure is the second surface 110
Alternatively, the maximum value is shown at the step between the third surface 120 and the first surface 100. FIG. 9 is a view showing a floating pressure distribution as viewed on a line passing between the second surface 110 and the third surface 120 and taken in the length direction in the magnetic disk device shown in FIGS. is there. As shown in the figure, the flying pressure is controlled by a protrusion 525 that applies a load P from the head support device 5 to the magnetic head 5.
The maximum value is shown at the position.

As shown in FIG. 8, the position of the wall surface 113 in the longitudinal direction of the second surface 110 and the third surface 120 is determined by the load P
In this case, the load capacity on the air inflow side is increased, and the floating clearance on the air inflow side is larger than that on the air outflow side. Therefore, the flying posture is stabilized.

The projected plane areas of the second surface 110 and the third surface 120 may be the same or different. When the projected plane areas of the second surface 110 and the third surface 120 are made different, the load capacity on both sides in the width direction can be adjusted. Thus, the roll angle of the slider 1 can be controlled to adjust the flying attitude. The projection area can be adjusted by making the widths W1 and W2 of the second surface 110 and the third surface 120 different from each other. For example, in the rotary actuator system shown in FIGS. 4 to 7, as shown in FIG. 1, the width W2 of the third surface 120 on the outer peripheral side of the magnetic disk 4 is changed to the second surface 110 on the inner peripheral side. By making the width slightly smaller than the width W2, the load capacity at the inner and outer circumferences can be adjusted, the roll angle of the slider 1 can be reduced, and the flying attitude can be stabilized. The load capacity at the inner and outer circumferences can also be adjusted by changing the length instead of changing the width or changing the width. Adjustment of load capacity by selection of width and length
This is possible even if the projected plane areas of the surface 110 and the third surface 120 are the same.

The air bearing action of the second surface 110 and the third surface 120 can be controlled by selecting the shape. Examples of shapes that can be selected are shown in FIGS.

In the embodiment shown in FIG.
The angle formed between the second wall surface 113 and the first wall surface 112 is selected to be greater than 90 degrees. Similarly, the angle between the second wall surface 123 provided on the third surface 120 and the first wall surface 122 is selected to be greater than 90 degrees.

In the embodiment shown in FIG.
22 has an arc-shaped plane shape. In FIG. 12, the wall 11
2, 122 have a triangular planar shape.

In the embodiment of FIGS. 13 to 15, the second surface 1
The bottom surfaces 111 and 121 of the tenth and third surfaces 120 are inclined in the length direction of the slider 1. Bottom 111, 121
13 is a flat surface in FIG. 13, a convex curved surface in FIG. 14, and a concave curved surface in FIG.

The plane shape, edge shape, wall shape, and the like of the second surface 110 and the third surface 120 can take various forms other than the above embodiment. FIG.
As shown in FIG. 16 to 19 show plan projection views on the air bearing surface side. In FIG. 16, the second surface 1
10 and the third surface 120 are straight portions 11 along the length direction.
2 and 122 and arc portions 113 and 123 connected to the straight portions 112 and 122, respectively. In FIG. 17, the second surface 110 and the third surface 12
Reference numeral 0 denotes arcuate portions 112 and 122 along the length direction, and linear portions 113 and 1 connected to the arcuate portions 112 and 122.
23. In FIG. 18, the second surface 110 and the third surface 120 are composed of straight portions 112 and 122 which are inclined in the length direction, and the straight portions 11 and 122.
It has an edge shape obtained by combining width-direction linear portions 113 and 123 connected to 2 and 122. In the embodiment shown in FIG. 19, each of the second surface 110 and the third surface 120 has an arc shape extending in the length direction from a corner formed by one end in the length direction and the outer edge in the width direction. Parts 112, 122;
It has an edge shape obtained by combining the straight portions 113 and 123 in the width direction.

20 to 22 are side views as viewed from one end in the length direction. The wall surfaces 112 and 122 (or the wall surfaces 113 and 123) of the second surface 110 and the third surface 120 are
As shown in FIG. 20, an inclined surface may be used.
May be a concave surface, or may be a convex surface as shown in FIG.

Although illustration is omitted, it goes without saying that there can be many combinations of the embodiments.

[0043]

As described above, according to the present invention, the following effects can be obtained. (A) It is possible to provide a magnetic head suitable for achieving a high recording density and suitable for miniaturization and mass production. (B) When used in combination with a magnetic disk, it is possible to provide a magnetic head, a magnetic head device, and a magnetic disk device that have a stable flying attitude of the slider and are excellent in translational vibration resistance and tracking performance. As a result, 0.1
Reading and writing operations can be performed while maintaining a small floating gap of μm or less, and combined with a magnetic disk with high surface accuracy, for example, a magnetic disk using a glass substrate, high-density recording, large-capacity magnetic A disk device can be realized. (C) It is possible to provide a magnetic head, a magnetic head device, and a magnetic disk device capable of reducing fluctuation of a floating gap when a magnetic head seeks on a magnetic disk at high speed. (D) It is possible to provide a magnetic head, a magnetic head device, and a magnetic disk device that can control the slider roll angle and thereby stabilize the flying attitude.

[Brief description of the drawings]

FIG. 1 is a perspective view of a magnetic head according to the present invention.

FIG. 2 is a front view of the magnetic head shown in FIG. 1;

FIG. 3 is a right side view of FIG. 2;

FIG. 4 is a plan view of a magnetic disk drive according to the present invention.

FIG. 5 is a diagram illustrating the operation of the magnetic disk device shown in FIG.

FIG. 6 is a side view of the magnetic head device according to the present invention.

FIG. 7 is a bottom view of the magnetic head device shown in FIG. 6;

FIG. 8 is a diagram showing a floating pressure distribution on a line passing through a second surface or a third surface and taken in a length direction in the magnetic disk device shown in FIGS. 4 to 7;

FIG. 9 is a diagram showing a floating pressure distribution on a line passing in a length direction between a second surface and a third surface in the magnetic disk device shown in FIGS. 4 to 7;

FIG. 10 is a perspective view showing still another embodiment of the magnetic head according to the present invention.

FIG. 11 is a perspective view showing still another embodiment of the magnetic head according to the present invention.

FIG. 12 is a perspective view showing still another embodiment of the magnetic head according to the present invention.

FIG. 13 is a perspective view showing still another embodiment of the magnetic head according to the present invention.

FIG. 14 is a perspective view showing still another embodiment of the magnetic head according to the present invention.

FIG. 15 is a perspective view showing still another embodiment of the magnetic head according to the present invention.

FIG. 16 is a plan view of a magnetic head according to still another embodiment of the present invention, as viewed from an air bearing surface side.

FIG. 17 is a plan view of a magnetic head according to still another embodiment of the present invention, as viewed from the air bearing surface side.

FIG. 18 is a plan view of a magnetic head according to still another embodiment of the present invention, as viewed from an air bearing surface side.

FIG. 19 is a plan view of the magnetic head according to the present invention as viewed from the air bearing surface side.

FIG. 20 is a side view of still another embodiment of the magnetic head according to the present invention.

FIG. 21 is a side view of still another embodiment of the magnetic head according to the present invention.

FIG. 22 is a side view of still another embodiment of the magnetic head according to the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Slider 2 Magnetic transducer 100 First surface 110 Second surface 120 Third surface 4 Magnetic disk 5 Head support device

Claims (10)

(57) [Claims] 1. A magnetic head including a slider and a magnetic transducer, wherein the slider has only one air bearing surface on one surface side, and the air bearing surface has a first surface and a second air bearing surface. And a third surface, wherein the first surface constitutes one continuous plane, and each of the second surface and the third surface comprises the slider
On the air inflow end side located at one end side in the length direction,
The width direction including the corner formed by the air inflow edge and the width direction edge
Are provided on both sides, and a part of the first surface is located between the two.
And formed so as to be lower than the first surface.
Is the is the end divided by the middle of the length direction of the slider, the magnetic conversion element, a magnetic head provided in the other end of the length direction. 2. The magnetic head according to claim 1, wherein the second plane and the third plane have equal or different projected plane areas. 3. The magnetic head according to claim 2, wherein at least one of a length dimension and a width dimension of the second surface and the third surface is different from each other. 4. The magnetic head according to claim 1, wherein a bottom surface of the second surface and the third surface is one of a flat surface and a curved surface. 5. The magnetic field according to claim 1, wherein the second surface and the third surface have a wall surface connected to the first surface that is substantially perpendicular or inclined with respect to the first surface. head. 6. The magnetic head according to claim 5, wherein the wall has an edge shape of a straight line, a curve, or a combination thereof. 7. The magnetic head according to claim 1, wherein a maximum depth from the first surface to the bottom surface of the second surface and the third surface is in a range of 0.1 to several tens μm. . 8. A magnetic head device including a magnetic head and a head support device, wherein the magnetic head is any one of claims 1 to 7, wherein the head support device is a magnetic head. A magnetic head device for supporting and applying a load. 9. The magnetic head device according to claim 8, wherein the head support device has a length from the one end side of the slider to a load point larger than the lengths of the second surface and the third surface. . 10. A magnetic disk, a magnetic head device,
A magnetic disk device including a positioning device, wherein the magnetic disk is driven to rotate, the magnetic head device is the one described in claim 8, and the positioning device is the magnetic head A magnetic disk device for rotating the device on the surface of the magnetic disk.