JPH0574090A - Magnetic head slider - Google Patents

Abstract

PURPOSE:To provide the magnetic disk device which stably and safely executes contact recording and reproducing with a simple structure. CONSTITUTION:The inflow end side of a slider 1 has a positive pressure- generating rails which generate buoyancy to maintain a nearly specified spacing from the surface of a disk 3 and its outflow end side is mounted with a center rail which hardly generates the buoyancy so as to maintain a contact state with the surface of the disk 3. The end face of the magnetic pole of the magnetic head is mounted near the extreme outflow end of the center rail on the outflow end side. The magnetic pole of the magnetic head exists in the position nearest the disk surface at all times and the contact load can be designed to an adequate value from the pressing load and the shape of the positive pressure generating rails on the inflow end side. The contact load of the magnetic pole of the magnetic head is maintained nearly constant even against the waving of the disk surface. The contact recording and reproducing are thus stably and safely executed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic disk device in which a magnetic head performs contact recording / reproduction with respect to a magnetic disk.

[0002]

2. Description of the Related Art In order to further increase the recording density of a magnetic disk device, it is essential to keep the gap between the magnetic head and the surface of the magnetic disk stable and narrow. For this purpose, contact recording / reproduction is a breakthrough. Furthermore, the magnetic disk device must also have a low bit cost. Therefore, it is necessary to stably and safely perform contact recording / reproduction with a simpler structure. The conventional flying-type slider disclosed in JP-A-49-121514 is designed to fly all flying surfaces. Therefore, these cannot be used as they are for contact recording and reproduction. Further, the active control type contact recording / reproducing head slider disclosed in Japanese Patent Laid-Open No. 62-250570 requires a complicated structure and a control circuit.

[0003]

Therefore, without performing active control, the magnetic pole position of the magnetic head stably contacts the disk surface with a small contact load without active control, and contact recording / reproducing is stable and safe. It is necessary to do.

[0004]

In order to solve this problem, in a conventional slider which is pressed against a disk by a negative pressure generated on a support spring or an air bearing surface of the slider itself, the inflow end side of the slider has a disk surface. Is equipped with a positive pressure generating rail that generates a levitation force so that a nearly constant gap is maintained, and the outflow end side is equipped with a center rail that hardly generates a levitation force so that it contacts the disk surface. The magnetic head magnetic pole may be mounted near the outflow end.

[0005]

Since the inflow end side of the slider maintains a substantially constant gap from the disk surface and the outflow end side can maintain contact with the disk surface, the magnetic head magnetic pole near the outflow end is
It is always located closest to the disk surface on the slider air bearing surface. The contact load of this magnetic head magnetic pole is the value obtained by subtracting the levitation force generated at the positive pressure generating rail on the inflow end side from the pressing load, so design it to an appropriate value depending on how the pressing load is applied and the shape of the positive pressure generating rail. it can. Also, the levitation force generated by the positive pressure generation rail becomes weaker as the slider moves away from the disk surface, and becomes stronger as the slider approaches the disk surface. Stable and safe contact.

[0006]

An embodiment of the present invention will be described with reference to the drawings. FIG. 1 shows a slider according to an embodiment of the present invention as viewed from the disk side. It has two positive pressure generating rails on both left and right sides on the inflow end side, and a center rail with a narrow width at the center position on the outflow end side in the left-right direction so that almost no positive pressure is generated. The magnetic head magnetic pole end surface is held near the most outflow end position of the center rail so as to be substantially flush with the center rail. The positive pressure generating rail on the inflow end side is tapered as in the prior art. FIG. 2 is a side view of this slider. A load w is applied to such a slider as shown in FIG. The outflow end contacts the disk surface with a contact load of a value obtained by subtracting the levitation force f generated at the inflow end side rail from the pressing load w. Depending on the value and position of the pressing load w and the shape of the positive pressure generating rail, the contact load is controlled so that the disk surface and the slider are not excessively worn, and the contact is designed to be stable. According to this embodiment, since the magnetic head magnetic pole is located at the center of the slider in the left-right direction, the magnetic head magnetic pole can maintain a stable contact state even if the slider fluctuates so as to roll left and right. Further, since this shape can be formed by machining, equipment such as etching is not required.

FIG. 3 shows a second embodiment. This embodiment is almost the same as the first embodiment, but the center rail on the outflow end side is wide near the outflow end. A conventional thin film magnetic head element requires a certain width near the magnetic pole on the air bearing surface. According to this embodiment, the conventional thin film magnetic head element can be easily mounted, and the center rail on the outflow end side hardly generates a levitation force, so that this function can be realized.

[0008]

According to the present invention, the magnetic pole position of the magnetic head stably contacts the disk surface with a small contact load without active control, and contact recording / reproduction can be stably and safely performed.

[Brief description of drawings]

FIG. 1 is a plan view of a slider showing a first embodiment of the present invention as seen from a disk side.

FIG. 2 is a plan view of the slider showing the first embodiment of the present invention as seen from a side surface parallel to the disk.

FIG. 3 is a plan view of a slider showing a second embodiment of the present invention as seen from the disk side.

[Explanation of symbols]

1 ... magnetic head slider, 2 ... taper, 3 ... magnetic disk.

Claims (4)

[Claims] 1. A slider for holding a magnetic head and stably contacting the magnetic head with the surface of a disk, wherein the slider moves against the disk by a negative pressure generated on a support spring or the air bearing surface of the slider itself. Has a center rail that generates levitation force on the inflow end side and almost no levitation force on the outflow end side.
A magnetic head slider characterized in that a magnetic head magnetic pole end surface is held near the most outflow end position of the center rail so as to be substantially flush with the center rail. 2. A slider for holding a magnetic head and stably contacting the magnetic head with a surface of a disk, wherein an inflow end side of the slider maintains a substantially constant gap from the surface of the disk and an outflow end. The magnetic head slider is characterized in that the side is in contact with the surface of the disk and the end face of the magnetic pole of the magnetic head is located near the most outflow end. 3. The slider according to claim 1, wherein the slider holds the magnetic head and brings the magnetic head into stable contact with the surface of the disk, and two positive pressures are generated at the left and right ends on the inflow end side. A rail is provided, and a center rail that generates almost no positive pressure is provided at the center position in the left-right direction on the outflow end side, and the magnetic head magnetic pole end surface is almost the same as the center rail near the position of the most outflow end of the center rail. Magnetic head slider that holds the surface. 4. A magnetic disk device in which the magnetic head performs contact recording / reproduction with respect to the magnetic disk by using the magnetic head slider according to claim 1, 2, or 3.