JPH0432080A - Floating type magnetic head - Google Patents

Abstract

PURPOSE:To allow air to flow in smoothly at the time when floating is started by executing rough working to the air bearing surface and executing specular working to the air inflow chamfer surface. CONSTITUTION:The air bearing surface 3 is subjected to rough working, for instance, to the extent that center line average roughness Ra exceeds 20Angstrom , and also, the air inflow chamfer surface 5 formed in the end part of the air bearing surface is subjected to specular working, for instance, to the extent that center line average roughness Ra becomes <=20Angstrom . In such a way, the air bearing surface 3 is formed to the rough surface, and the air inflow chamfer surface 5 is formed to the specular surface, therefore, even if the contact start/ stop CSS increases, an increase of a coefficient of friction can be suppressed, and also, adhesion of dust to the air inflow chamfer surface 5 decreases, and a smooth air inflow at the time of floating is started is obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a floating magnetic head used in hard disk drives and the like.

(Prior Art) As a floating magnetic head, as shown in FIG. 4 and FIG. 5, which is a view taken in the direction of arrow B in FIG. 4, two air bearing surfaces 51. 51, and the end of this slider 50 has a head 52 located at the center of these air bearing surfaces 51, 51, and maintains a constant gap above the rotating magnetic disk by the effect of the air bearing. There are devices that float up and come into contact with the magnetic disk when the rotation of the magnetic disk stops. In a hard disk drive, a cycle of floating and contact is repeated, and this cycle is called contact start/stop (hereinafter referred to as rcssJ).

By the way, as the number of C8S increases, a problem arises in that the coefficient of friction between the magnetic head and the magnetic disk increases, so conventionally, the air bearing surface was roughened by dry etching etc., as disclosed in Japanese Patent Application No. 1982- 30498
It is disclosed in No. 3.

(Problem to be Solved by the Invention) As described above, by increasing the surface roughness of the air bearing surface, an increase in the coefficient of friction is prevented, as shown in Figure 6, which shows the relationship between the number of C8S and the coefficient of friction. However, as the number of C8S increases,
As shown in the figure, dust 54 adheres to the air inflow chamfer surface 53 of the air bearing surface 51, making it difficult for air to flow in smoothly at the start of floating.

(Means for Solving the Problems) In order to solve the above problems, the present invention roughens the air bearing surface to the extent that the center line average roughness Ra is 20 Angstroms or more, and The air inflow chamfer surface formed at the end was mirror-finished to such an extent that the center line average roughness Ra was less than 20, for example.

(Function) The air bearing surface is rough to reduce the coefficient of friction, and the air inflow chamfer surface is a mirror surface, which reduces the amount of dust attached and allows air to flow in smoothly at the start of levitation.

(Example) Embodiments of the present invention will be described below with reference to the accompanying drawings.

FIG. 1 is a perspective view of a floating magnetic head according to the present invention, and FIG.
The figure is a front view of the floating magnetic head, and Figure 3 is A of Figure 2.
It is a directional view.

The floating magnetic head 1 has two parallel air bearing surfaces 3.3 formed on both sides of a slider 2.
It has a head 4 located at the center of the two air bearings 3.3 at the end thereof, and a chamfer surface 5.5 for air inflow is formed at the end of the air bearing surfaces 3,3.

The air bearing surface 3 is formed by, for example, dry etching, and has a center line average roughness R, which is a surface roughness measured in a direction parallel to the relative running direction of the head.
a is 20 or more, and after forming the air bearing surface 3, the air inflow chamfer surface 5 is chamfered, for example, by lapping with O to 1/4 μm diamond abrasive grains, so that the center line is Average roughness Ra is 20
It is formed to be less than human.

In this way, the air bearing surface 3 is formed as a rough surface, and the air inflow chamfer surface 5 is formed as a mirror surface, so that C8
Even if S increases, the increase in the coefficient of friction can be suppressed, and moreover, the adhesion of dust to the air inflow chamfer surface 5 is reduced, and smooth air inflow at the start of levitation can be obtained.

(Effects of the Invention) As explained above, according to the present invention, the air bearing surface is a rough surface with an Ra of 20 Å or more, and the air inflow chamfer surface is a mirror surface with an Ra of less than 20. While reducing the coefficient, it is possible to prevent dust from adhering to the chamfer surface and to allow air to smoothly flow in at the start of levitation.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of a floating magnetic head according to the present invention, and FIG.
The figure is a front view of the floating magnetic head, and Figure 3 is A of Figure 2.
4 and 5 are front views of a conventional floating magnetic head and its views in the B direction, and FIG. 6 shows the number of C8Ss and the distance between the magnetic head and the magnetic disk with respect to the roughness of the air bearing surface. 2 is a graph showing an example of the relationship between friction coefficients. 1...Floating magnetic head, 2...Slider, 3...
・Air bearing surface, 5... Chamfer surface for air inflow. Patent applicant: Japan Victor Co., Ltd. C8S number figure 6

Claims (1)

[Claims] A floating magnetic head having two air bearing surfaces, one end of which is a chamfer surface for air inflow, wherein the air bearing surface is rough-finished and the chamfer surface for air inflow is mirror-finished. head.