JPH1125631A - Magnetic head - Google Patents

Abstract

(57) Abstract: An object of the present invention is to provide a magnetic head having a structure capable of making the flying height of an air floating type magnetic head uniform in the radial direction of a disk. An air-floating slider (4) for bringing a flat air bearing surface (41) between an air inlet end (42) and an air outlet end (43) close to a magnetic disk (1), and a winding (6) mounted on the slider. The magnetic head is configured so as to include a core 5 formed as described above and a negative pressure generating section formed by a minute gap formed on the air outflow end 43 side of the slider.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an air floating type magnetic head.

[0002]

2. Description of the Related Art As shown in FIG. 3, in a disk drive device for moving a magnetic head 2 in the radial direction of a rotating magnetic disk 1, the head 2 is moved, for example, by an arm (or suspension) 3 to the disk 1. Is held at a position close to the surface.

FIG. 5 shows an example of a magnetic head 2 comprising a ceramic slider 4 attached to the tip of an arm 3 and a ferrite core 5 fixed to a side surface of the slider 4. The magnetic head 2 is called a side core composite head, and a magnetic core 2 fixed to a side surface is wound directly or through a resin bobbin.
Is applied. The upper end of the core 5 is a gap 51.

In the flying magnetic head, the surface of the slider 4 is formed on a flat surface called an air bearing surface (ABS) 41, and the ABS 41 is opposed to the surface of the disk 1 in FIG. The floating magnetic head 2 flies above the surface of the disk 1 due to the generation of an airflow accompanying the rotation of the disk 1. In this case, one end of the ABS 41 of the slider 4 is an air inflow end 42 and the other end is an air outflow end 43.

In the structure of the conventional floating magnetic head, there is a structure in which the entire area from the inflow end 42 to the outflow end 43 is made of a flat ABS 41, but generally has an inclined surface as shown in FIG. One of the reasons is to reduce the damage when the slider 4 collides with the disk 1.

FIG. 6 shows a specific example of a conventional side-core composite floating magnetic head. In the magnetic head of this example, the inflow end 42 and the outflow end 43 are both inclined surfaces, but the inclination angle θ1 of the outflow end 43 is set in a range of about 10 ° to 45 °.

[0007]

According to experiments, when the inclination angle θ1 of the outflow end 43 is set in the range of about 10 ° to 45 °, the flying height of the head increases as the peripheral speed of the disk 1 increases. And the level of the read output fluctuates between the inner circumference near the rotation axis 11 of the disk 1 and the outer circumference far from the rotation axis 11. FIG. 4 shows a simulation of a change in the air gap (flying height) of the flying magnetic head 2 as viewed in the radial direction of the disk 1. M1 indicated by a broken line is for the magnetic head of FIG.

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned problems and to provide a magnetic head having a structure capable of making the flying height of an air-floating magnetic head uniform in the radial direction of a disk.

[0009]

SUMMARY OF THE INVENTION It is an object of the present invention to provide an air-floating slider for bringing a flat air bearing surface between an air inlet end and an air outlet end close to a magnetic disk, and a slider mounted on the slider. Core with a winding
And a negative pressure generating portion formed by a minute gap formed on the air outflow end side of the slider.

In one embodiment of the present invention, the negative pressure generating portion is a slope having a vicinity of the air outflow end inclined to the main body side of the slider by about 1 ° with respect to the air bearing surface.

In another embodiment of the present invention, the negative pressure generating portion is a stepped portion in which the vicinity of the air outflow end is recessed by about 0.001 mm from the surface of the air bearing.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail with reference to embodiments shown in the drawings. FIG. 1 is a perspective view showing one embodiment of the present invention. The magnetic head 2 of this embodiment is also of a side-core composite type floating type similar to that shown in FIG. 5; 4 is a slider made of ceramic; 41 is its ABS; Ferrite core.

In terms of hydrodynamics, the air flow accompanying the rotation of the disk 1 flows in from the air inflow end 42 and escapes to the air outflow end 43. The air flowing from the air inflow end 42 acts as a positive pressure source for the flying head, and tends to move the slider 4 away from the disk 1. On the other hand, the air that escapes from the air outflow end 43 serves as a negative pressure source, and tries to attract the slider 4 toward the disk 1.

In the present invention, the flying height of the slider 4 is made uniform in the radial direction of the disk 1 by balancing using the negative pressure generated at the air outflow end 43. When the inclination angle θ1 of the outflow end 43 is set in the range of about 10 ° to 45 ° as in the conventional example of FIG. 6, almost no negative pressure generation effect is observed. Therefore, in the embodiment of the present invention shown in FIG. 1, the inclination angle θ2 of the outflow end 43, which is the inclined surface, is set to a value of about 1 °, which is much smaller than in the past, and the negative pressure is generated effectively. Like that. The solid line M2 in FIG. 4 is a characteristic according to the present invention, and shows that the gap is uniformly achieved in the radial direction.

FIG. 2 is a perspective view showing another embodiment of the present invention. In this example, the air outflow end 43 is a step having a depth G1 of about 0.001 mm, and is a negative pressure source similar to that of FIG. The characteristics in this case are also the same as M2 in FIG. 4, are uniform in the radial direction, and have a smaller gap than the conventional characteristics M1. Therefore, a high-level output that is uniform in the radial direction can be obtained.

[0016]

As described above, according to the present invention, it is possible to provide a magnetic head having a structure capable of making the flying height of an air floating type magnetic head uniform in the radial direction of the disk.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an embodiment of the present invention.

FIG. 2 is a perspective view showing another embodiment of the present invention.

FIG. 3 is an explanatory diagram showing a relationship between a flying magnetic head and a magnetic disk.

FIG. 4 is a characteristic diagram showing flying characteristics of the flying magnetic head.

FIG. 5 is a perspective view of a side core composite type floating magnetic head.

FIG. 6 is a perspective view of a conventional floating magnetic head.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Magnetic disk 2 Magnetic head 3 Arm 4 Slider 5 Ferrite core 6 Winding 11 Rotation axis 41 Air bearing surface (ABS) 42 Air inflow end 43 Air outflow end

Claims (3)

[Claims] An air-floating slider for bringing a flat air bearing surface between an air inflow end and an air outflow end close to a magnetic disk; a wound core mounted on the slider; A magnetic head comprising: a negative pressure generating section formed by a minute gap, formed on the side of the air outflow end of the slider. 2. The negative pressure generating portion is formed by making the vicinity of the air outflow end a slope inclined about 1 ° to the main body side of the slider with respect to the air bearing surface. 1 magnetic head. 3. The magnetic head according to claim 1, wherein the negative pressure generating portion is formed by forming a stepped portion near the air outflow end from the surface of the air bearing by about 0.001 mm.