JP3062089B2 - Magnetic head and magnetic disk drive using the same - 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 and a magnetic disk drive using the same, and more particularly to an air bearing surface (hereinafter referred to as ABS) facing a recording surface of a recording medium.
And a magnetic disk drive using the same.

[0002]

2. Description of the Related Art In recent years, in order to increase the density of a magnetic disk drive, it is necessary to design a flying height of a magnetic head in which a magnetic transducer needs to be close to a medium. There is a concern that the head may crash on the medium. Therefore, the flying height of the flying magnetic head must be raised at a certain height near the medium.

As shown in FIG. 9, a conventional magnetic head disclosed in Japanese Patent Application Laid-Open No. 63-276691 has a tapered surface 10 on the air inflow end side 101 of the surface of the magnetic head facing the medium.
2 has a groove 103 of a fixed width formed by grinding the surface facing the medium from the air inflow end to the air outflow end with a grindstone or the like, and the surface of two rails including the side surface 104 of the groove and the periphery of the magnetic head. Is a magnetic head having an ABS 105. In this magnetic head, the angle a at the intersection of the side 106 where the side surface 104 of the groove 103 intersects the ABS 105 and the side 107 at the air outflow end of the ABS is a right angle.

[0004] This intersection is between the ABS 105 and the side surface 104 of the groove.
And the side surface 108 on the air outflow side of the magnetic head. Similarly, the side 110 where the magnetic head side surface 109 intersects with the ABS 105 and the side
The angle b of the intersection of the S with the side 107 at the air outflow end is a right angle, and this point is also the vertex of a triangular pyramid formed by the ABS 105, the side surface 109 of the magnetic head, and the side surface 108 at the air outflow end.

[0005] As shown in FIG.
A device for attaching a suspension 16 to which a magnetic head is fixed to a rotary actuator 14, seeking from an inner circumference to an outer circumference of a medium 15, and recording / reproducing at a predetermined position;
As shown in FIG. 10 (A), the magnetic head receives the pressure at which the air layer enters the air from the air inflow end 101 of the magnetic disk at the peripheral velocity V due to the rotation of the medium, and the ABS 105 causes the air disk to float. The air inflow end 101 is adjusted so that the magnetic transducer 111 near the air outflow end 108 approaches the medium 15 in balance with the pressure P of the suspension 16.
The air outlet end 108 floats in a posture where the air outlet end 108 is lower.

Further, the peripheral speed varies depending on the radial position of the medium, and in order to keep the flying height of the magnetic transducer constant, the angle between the center line of the medium and the direction of the peripheral speed of the medium (hereinafter referred to as the YAW angle). Is controlled so that the distance of the magnetic transducer 111 from the medium is kept constant by utilizing the change in the magnetic field. At this time, the floating attitude of the medium from the air outflow end side 108 is as shown in FIG.
As shown in (B), the medium is in a floating attitude inclined with respect to the medium, and the lowest floating position is a corner b of one end of the air outflow end 107 of the ABS.
Becomes the lowest flying position and is lower than the magnetic transducer 111, so that the magnetic transducer 111 cannot approach the medium.

The magnetic head is warped as shown in FIG. 11C, and the angle a formed between the air outflow end 107 of the ABS and the side surface 104 of the groove is the lowest flying position even when there is no roll. There is a similar problem with.

Further, if the seek is performed in such a flying posture, the flying height is further reduced, and the angle of the apex of the triangular pyramid between the air outflow end of the ABS, the side surface of the magnetic head, and the ABS becomes acute as described above. Therefore, there is a problem that the medium is damaged by contact with the medium and writing and reproduction cannot be performed. Further, when an impact is given to the device, the device is similarly damaged. Further, in the case of a high-speed seek and a strong impact, the magnetic head may crash on the medium and the apparatus may not work.

A conventional magnetic head disclosed in JP-A-63-136370 and the like has a tapered surface 2 on the air inflow end side of the surface of the magnetic head facing the medium, as shown in FIG.
01, the width of the groove 202 on the surface facing the medium is smaller at the air outflow end 204 than at the air inflow end 203. Therefore, the ABS 205 has a width C2 at the air outflow end wider than the width C1 at the air inflow end, and the side surface 206 of the groove and the ABS 205
The angle D between the side 207 where the edge intersects and the side 208 at the air outflow end of the ABS is acute, and there is a high risk of damaging the medium.

Further, as shown in FIGS. 12 (A) and 12 (B), a conventional magnetic head disclosed in Japanese Patent Application Laid-Open No. Hei 4-27667 and the like is patterned on a surface facing a medium by photolithography or the like, and trimmed. There is also a magnetic head that cuts out the ABS 301 by the above method. However, since the angles e, f, g, h, i, and j of the air outflow end of the magnetic head are right angles or acute angles, the magnetic head is similar to the magnetic head described above. There is a problem.

[0011]

In the above-described conventional magnetic head, the flying height of one of the air outlet ends of the ABS is greatly reduced as compared with that of the magnetic transducer. There is a problem that it is not possible to approach the vicinity of the medium.

Further, the corners at both ends of the air outflow end of the ABS have the smallest flying height from the medium, and the corners at both ends of the air outflow end of the ABS are apex of a sharp triangular pyramid. Since the volume is reduced, there is also a problem that a crash occurs upon contact with the medium.

SUMMARY OF THE INVENTION An object of the present invention is to provide a magnetic head and a magnetic disk drive capable of designing a low head flying height and enabling high-density recording.

It is another object of the present invention to provide a magnetic head and a magnetic disk drive capable of performing high-speed seek and improving high-speed operation and safety against impact.

[0015]

[0016]

According to the present invention, there is provided a magnetic head having an air bearing surface facing a recording surface of a recording medium, wherein two sides of an outer periphery of the surface at an air outflow end of the air bearing surface. angle of intersection of the, by Rukoto cut off with a predetermined radius of curvature, the head of the roll and anti
Thus, a magnetic head characterized in that the flying height is prevented from lowering due to the magnetic head.

Further, according to the present invention, there is provided a magnetic head having an air bearing surface facing a recording surface of a recording medium, wherein an angle at which two sides of an outer periphery of the air bearing surface intersect at an air outflow end of the air bearing surface. An obtuse angle is obtained, and a part of the obtuse angle portion is cut off with a predetermined radius of curvature.

Further, according to the present invention, there is provided a magnetic disk drive characterized by mounting these magnetic heads.

The operation of the present invention will be described. The corner (quad) at the air outflow end of the ABS is cut off in a straight line or a curved line (round shape), and the corner is made an obtuse angle instead of an acute angle, so that the corner at the lowest flying position can be made more medium. , And even if the flying height decreases due to a high-speed seek or impact, the contact between the medium and the corner becomes a soft touch, and a crash can be prevented.

[0020]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below in detail with reference to the drawings.

FIG. 1 is a perspective view of a magnetic head according to an embodiment of the present invention. The magnetic head has a tapered surface 2 at the air inflow end 1 facing the medium recording surface, and the side surface 4 of the groove formed by grinding the surface facing the medium from the air inflow end 1 to the air outflow end 3 with a grindstone and the ABS 9. Is cut off with a grindstone at the intersection of the side 5 where the edge 5 intersects with the side 6 of the air outflow end 3 of the ABS, and the corner 7 on one side of the air outflow end 3 of the ABS is made obtuse.

Similarly, the side surface 8 of the magnetic head and the ABS
By chamfering a corner at which the side 9 intersects with the side 6 of the air outflow end 3 of the ABS, an obtuse angle of the other corner 12 of the air outflow end 3 of the ABS is obtained.

The magnetic head manufactured as described above is mounted on a magnetic disk device shown in FIG. The magnetic head 13 shown in FIG. 1 is attached to a suspension 16, and the suspension 16 is attached to a rotary actuator 14 so that the magnetic head 13 can seek to a predetermined radial position of the medium 15. By rotating the medium 15 of the magnetic disk device shown in FIG. 2, the magnetic head of FIG. 1 flies while rolling as shown in FIG. 3A, so that the magnetic head of FIG. The minimum flying height c of the present invention can be increased.

As shown in FIG. 3B, when the magnetic head is levitated without being rolled, the magnetic head may be warped by about 20 nm. Thus, the minimum flying height d of the present invention can be made higher.

Therefore, in the magnetic head shown in FIG. 1 of the present invention, the magnetic transducer 17 can be brought closer to the medium, and the density of the magnetic disk drive can be increased. Further, the magnetic head shown in FIG. 1 of the present invention does not damage the medium even when the magnetic head shown in FIG. There is no problem that writing and reproduction cannot be performed. In other words, the magnetic disk drive of the present invention has the effect of enabling high-speed seek, shortening the seek time, and improving the shock resistance.

FIG. 4 shows a second embodiment of the present invention. The magnetic head was patterned on the surface facing the medium by photolithography, and the ABS 21 was cut out by milling. By making the angles of both ends 23 of the air outflow end 22 of the ABS at this time obtuse similarly to the magnetic head shown in FIG. 1, the same effect as that of the above-described magnetic head shown in FIG. 1 can be obtained.

Similarly, when the magnetic transducer shown in FIG. 5 is at the center of the air outflow end of the magnetic head, AB
The same effect is obtained by making the corners 33 at both ends of the air outflow end 32 of S into an obtuse angle. Further, the magnetic head shown in FIG.
The same effect can be obtained even if both ends 42 of the air outflow end of the BS 41 are rounded.

In the magnetic head shown in FIG. 7, the ABS 51 is designed so as to roll only on one side, and the same effect can be obtained even when the radius 53 at which the minimum flying height is reduced is reduced. Further, as shown in FIG.
After dropping both ends of 2 with a straight line 63, the formed obtuse angle is dropped with a radius 64, thereby further improving high-speed seek durability and impact resistance.

[0029]

According to the present invention, the flying height can be designed to be smaller by reducing the angles on both sides of the air outflow end of the ABS, which is the lowest flying position of the magnetic head, to reduce the angle.

Further, according to the present invention, the corners at both ends of the ABS air outflow end, which is the lowest flying position of the magnetic head, are cut off at a certain radius of curvature (R) (R is attached), thereby achieving high-speed seek durability and durability. There is an effect that the impact property can be improved.

[Brief description of the drawings]

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

FIG. 2 is a schematic diagram of a magnetic disk drive of the present invention.

FIG. 3A is a side view of the magnetic head of the first embodiment of the present invention viewed from the air outflow side in a floating state, and FIG. 3B is an enlarged representation of the warpage of the first embodiment of the present invention. FIG. 5 is a side view of the floating state when viewed from the air outflow side.

FIG. 4 is a front view of a surface facing a medium according to a second embodiment of the present invention.

FIG. 5 is a front view of a surface facing a medium according to a third embodiment of the present invention.

FIG. 6 is a front view of a surface facing a medium according to a fourth embodiment of the present invention.

FIG. 7 is a front view of a surface facing a medium according to a fifth embodiment of the present invention.

FIG. 8 is an enlarged front view of a surface facing a medium according to a sixth embodiment of the present invention.

FIG. 9 is a perspective view showing a conventional magnetic head.

10A is a cross-sectional view showing a flying attitude of a conventional magnetic head, FIG. 10B is a side view of the floating state of the conventional magnetic head viewed from the air outflow side, and FIG. 10C is a conventional magnetic head. FIG. 5 is a side view of the air-warp state when viewed from the air outflow side when the warpage is expressed in an enlarged manner.

FIG. 11 is a perspective view of a conventional head.

FIG. 12 is a diagram showing a front view of a conventional head.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Air inflow end 2 Tapered surface 3 Air outflow end 4 Side of groove 5 Side where ABS intersects with side of groove 6 Air outflow end of ABS 7 Corner of air outflow end of ABS 8 Side surface of magnetic head 9 ABS 10 ABS and Side that intersects the side surface of the magnetic head 12 Corner of the end of the air outflow end of the ABS 13 Magnetic head 14 Rotary actuator 15 Medium 16 Suspension 17 Magnetic transducer

Claims (3)

(57) [Claims] 1. A magnetic head having an air bearing surface facing a recording surface of a recording medium, wherein an angle of two sides of an outer periphery of the surface at an air outflow end of the air bearing surface is cut off with a predetermined radius of curvature. Re to Rukoto
And a magnetic head for preventing a flying height from being reduced by a roll or warpage of the head. 2. A magnetic head having an air bearing surface facing a recording surface of a recording medium, wherein an angle between two sides of an outer periphery of the air bearing surface at an air outflow end is an obtuse angle. Since a part of the obtuse angle is cut off with a predetermined radius of curvature , the head low
A magnetic head characterized in that a flying height is prevented from being reduced due to a warp or warpage . 3. A magnetic disk drive comprising the magnetic head according to claim 1 mounted thereon.