JPS61192083A - Magnetic head slider - Google Patents

Abstract

PURPOSE:To decrease a levitated extent fluctuation of a magnetic head by providing a gradient surface inclined radialwise to a side end portion which is opposite to a magnetic disk surface of a levitation rail. CONSTITUTION:4b provides the gradient surface 4b at the side end portion which is opposite to the magnetic disk 1 of the levitation rail 4 so as to incline to the radial D-D of the magnetic disk 1. When an absolute angle of attack increases, an air volume flowing from the gradient surface 4b provided at the side end portion so increases that it can supplement a decrease of air volume flowing the gradient surface 4a of the side end portion. Thus it is possible to decrease the magnetic head levitation extent fluctuation because of a change of the angle of attack in comparison with conventional examples.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention mainly relates to a magnetic head slider installed in a magnetic disk device equipped with a non-flexible magnetic disk, particularly a magnetic disk device equipped with a rotary type head positioning mechanism. Regarding the improvement of

1 for magnetic disk drives with relatively large recording densities.
In order to prevent wear and damage caused by contact with a rotating magnetic disk, a magnetic head is usually designed to float, for example, several micrometers above the surface of the magnetic disk.

This is called a floating head and is a ramp load method.

In other words, the magnetic head approaches the magnetic disk after the rotational speed of the magnetic disk reaches a certain speed, and the magnetic head is retracted from the magnetic disk at the front when stopping, and the contact start-stop method (C3S method) In other words, the magnetic head starts rotating the magnetic disk while it is in contact with the magnetic disk, the magnetic head floats above the magnetic disk surface while the magnetic head is rotating, and the magnetic head is not retracted even when the magnetic disk rotation is stopped. However, the latter is often used when a relatively high access speed is required.

Among these, for example, in the C8S type magnetic head, the main part, the magnetic head slider, is held by a spring arm via a gimbal mechanism, and while the magnetic disk is rotating at a specified speed, the magnetic disk and the magnetic head slider are The positive pressure created by the air flow between
by the balance between the lift force) and the reaction force of the spring arm.

A constant distance is maintained between the magnetic head slider and the magnetic disk surface.

On the other hand, the positioning mechanism of the magnetic head in the radial direction of the magnetic disk consists of a moving carriage mounted with a spring arm and a motor that drives the carriage. Of these, the carriage and carriage mechanisms are linear type (straight-moving type). The rotary type is broadly divided into the rotary type and the rotary type, and the rotary type is often used in relatively small magnetic disk drives.

In a linear type, the posture (the angle between the radial direction of the magnetic disk or the tangential direction of the track and the spring arm) does not change even if the magnetic head moves, whereas in a rotary type, the posture changes as the magnetic head moves. Change.

At this time, it is desirable that a stable lifting force always acts on the magnetic head slider regardless of changes in the attitude of the magnetic head.

[Conventional technology]

FIG. 3 shows an external view of a C8S type magnetic head slider using a side view (a plan view (bl) and a cross-sectional view (C) taken along the line X--X as viewed from the side facing the magnetic disk Al and the magnetic disk.

In the figure, 1 represents the surface of the magnetic disk, and arrow A represents the rotation direction of the magnetic disk 1.

2 is a center rail provided almost parallel to the tangential direction of the trunk; 3 is a read/write gap provided at the rear end of center rail 1 (right side in the figure); and 4 is provided parallel to both sides of center rail 2. The floating rails 4 are provided with a sloped surface 4a at the top (left side in the figure) as shown in the figure.

With this structure, when the magnetic disk 1 rotates in the direction of arrow A, the air in contact with the magnetic disk 1 moves and flows between the magnetic disk 1 and the magnetic hent slider. As a result, a positive pressure p having a distribution as illustrated in FIG. 4 is generated on the levitation rail 4, that is, a lift force that causes the magnetic Hent slider to levitate from the magnetic disk surface 1.

Incidentally, the sloped surface 4a is provided to increase the efficiency of air flowing between the magnetic disk 1 and the magnetic slider.

[Problem that the invention seeks to solve]

FIG. 5 is a diagram showing changes in the attitude of the magnetic head slider when it is mounted on a carriage of a Rochley type positioning mechanism, where B indicates the center of rotation of the magnetic disk 1, and C represents the center of rotation of the Rochley type carriage.

Also, PC-QC-17C each represents the center line of the carriage, and if the angle (angle of attack) θ between the center line of the carriage and the track tangent direction is zero when the center line of the carriage is at PC, then PC-QC-17C is outside of PC. An angle of attack θp of the angle occurs, and an angle of attack θr of the opposite sign occurs on the inner side.

As described above, the sloped surface 4a is provided to increase the efficiency of air inflow between the magnetic disk l and the floating rail 4, but in the magnetic head slider with the above configuration, the sloped surface 4a is The effect changes.

For this reason, as illustrated in FIG. 6, there is a problem in that the flying height h (the scale indicates the maximum value normalized to 1) of the magnetic hent slider varies depending on the angle of attack θ.

[Means for solving problems]

The magnetic hesode slider according to the present invention includes a floating rail formed substantially parallel to the tangential direction of the track on a surface facing the magnetic disk, and lifts the magnetic disk by the lift force created by the air flow induced by the rotation of the magnetic disk. In a magnetic head slider of a type that levitates from a surface, the above-mentioned problem is alleviated by providing a sloped surface that is inclined with respect to the radial direction of the magnetic disk at the side edge of the surface of the floating rail that faces the magnetic disk surface. The aim is to

[Effect]

That is, in addition to the sloped surface provided at the front end, that is, the front edge of the surface of the floating rail facing the magnetic disk, by providing a sloped portion inclined with respect to the radial direction of the magnetic disk at the side edge, the above-mentioned It is possible to compensate for the decrease in the air inflow effect in the conventional example, and to reduce fluctuations in the flying height of the magnetic head slider due to changes in the angle of attack.

〔Example〕

The gist of the present invention will be specifically explained below using examples.

FIG. 1 shows the main parts of an embodiment of the present invention in a side view (a), a plan view (b) seen from the side facing the magnetic disk surface, and a XX cross-sectional view (C1). .

In the figure, the same reference numerals as those in the conventional example in FIG. It is a sloped surface designed to

With the above configuration, when the absolute value of the angle of attack θ increases, the amount of air flowing in from the sloped surface 4b provided at the side edge increases. This can compensate for the decrease in the amount of air flowing in.

Therefore, fluctuations in the flying height of the magnetic head due to changes in the angle of attack θ can be reduced compared to the conventional example (dotted line), as illustrated in FIG.

〔Effect of the invention〕

As described above, according to the present invention, it is possible to reduce fluctuations in the lift force acting on the magnetic head slider, and therefore it is possible to reduce fluctuations in the flying height of the magnetic head.

[Brief explanation of drawings]

FIGS. 1A to 1E are configuration diagrams of an embodiment of the present invention. FIG. 2 is a detailed explanatory diagram of the present invention. FIGS. 3(a) to 3(C) are configuration diagrams of a conventional example. FIG. 4 is an explanatory diagram regarding lift force. FIGS. 5 and 6 are explanatory diagrams of problems in the conventional example. In the figure. 1 is the magnetic disk, 2 is the center rail. 3 is the gap 9. 4 is the floating rail. 4b indicates a sloped surface. (α) (C) 1st area Graduation 2nd grade (α) (C) Mine 4 garden

Claims (1)

[Claims] A magnetic head slider that is equipped with a floating rail formed substantially parallel to the tangential direction of the track on a surface facing the magnetic disk, and levitates from the surface of the magnetic disk by the lifting force created by the air flow induced by the rotation of the magnetic disk. A magnetic head slider according to claim 1, wherein a side edge of a surface of the floating rail facing the magnetic disk surface is provided with a sloped surface that is inclined with respect to the radial direction of the magnetic disk.