JPS62184679A - Head burnish system - Google Patents

Abstract

PURPOSE:To eliminate completely an obstacle on the surface of a medium by applying a voltage between a magnetic head and a magnetic disk medium and utilizing an attracting force to be caused so as to lower the floating quantity of the head. CONSTITUTION:The magnetic disk device 1 is assembled, enclosed by a cover 11, a switch 13 is opened to isolate an actuator 12, and in applying a voltage Vcc to the actuator 12, the voltage Vcc is fed to magnetic heads 121-125 via arms a1-a5, an attracting force is generated between magnetic disk media 15-17 and the heads 121-125, and the heads descend toward the medium. The voltage Vcc is changed to control properly the head floating quantity, and in driving a shaft 18, the inside of the magnetic head device 1 is sealed and it is not required to decrease number of revolutions, an obstacle such as dust and dirt on the surface of the medium is removed completely.

Description

[Detailed Description of the Invention] [Summary] This is a head vanishing method that utilizes the attractive force generated by applying a voltage between the insulated magnetic head of a magnetic disk device and a magnetic disk medium to burn the head. The objective is to reduce the flying height of the medium to remove obstacles on the surface of the medium.

[Industrial application field]

The present invention relates to a head vanish method. During or after assembling a magnetic disk device, dirt, dust, etc. adhere to the surface of the disk medium from the outside. Such deposits interfere with the reading and writing operations of the head, so they must be removed in advance.

The present invention relates to a head vanishing method for removing obstacles on the surface of a medium using a magnetic head.

[Conventional technology]

There were two conventional Herad Vanish methods.

In the first method, the flying height of the head is set small in advance, and obstacles on the disk medium are removed by the head while rotating the disk.

The second method lowers the head flying height and removes obstacles by reducing the rotational speed of the disk and reducing the pressure between the disk and the head.

[Problem that the invention seeks to solve]

The first method is to remove it before assembly, so
Dust and the like may adhere to the surface of the medium after it is removed and before it is assembled.

In the second method, since the rotational speed of the disk is reduced, the collision energy between the obstacle and the head is small, and there is a possibility that the obstacle cannot be removed sufficiently.

That is, in the past, there was a problem that obstacles on the surface of the magnetic disk medium could not be completely removed.

[Means for solving problems]

An object of the present invention is to solve the above problems and completely remove obstacles on the surface of a magnetic disk medium using a magnetic head.

The means for this purpose, as shown in the principle diagram of the present invention in FIG.
The purpose is to control the flying height 1h of the magnetic head H by the action of the attractive force r generated by applying .

[For production]

As described above, according to the present invention, voltage Vcc is applied between the magnetic head H and the magnetic disk medium.

By changing the voltage Vcc, f also changes, and the flying height can be controlled accordingly.

Therefore, by changing Vcc after assembling the magnetic disk device, the flying height can be controlled and obstacles can be completely removed.

〔Example〕

The invention will now be explained by way of example with reference to the accompanying drawings.

FIG. 2 is a diagram showing an embodiment of the present invention. The magnetic disk device 1 shown in FIG. 2 includes magnetic disk media 15, 16,
Magnetic heads 121 to 125 are floating relative to magnetic head 17, and the magnetic heads are positioned by actuator 12 which moves in the direction of arrow β via arms a1 to a5.

The media 15, 16, 17, heads 121 to 12
5. The actuator 12 assembly is surrounded by a cover 11 and sealed from the outside, and a filter 19 maintains the same air pressure inside and outside to prevent dirt, dust, etc. from entering the inside. The actuator 12 is mounted on a stand 14, and can be grounded or insulated by opening and closing a switch 13.

The arms a1 to a5 are pushed down by a spring (not shown) at the base end with a force of 8 (gf), and the media 15 to 17
and the heads 121 to 125 are O゛, 25 to 0.3
A gap of approximately [μm] is formed.

Further, a voltage Vcc can be applied to the actuator 12, and the cover 11 and shaft 18 are grounded.

The operation of the apparatus shown in FIG. 2 will be explained below with reference to FIGS. 3 and 4.

After the magnetic disk drive 1 shown in FIG. 2 is assembled and surrounded by a cover 11, the switch 13 is opened to insulate the actuator 12.

When voltage Vcc is applied to actuator 12, Vcc is applied to the head via each arm.

In general, if the flying height is h, the attraction force is f, and the dielectric constant is ε0, there is a gap between each head and the medium, for example, between the head 121 and the medium 15, as shown in FIG. The head 121, which had been held down, moves down toward the medium 15 and comes to rest at a position as shown by the dashed line.

Therefore, the initial flying height is reduced to ho.

The relationship between f (gf) and h [μm] draws a hyperbola as shown in FIG.

By appropriately controlling the head flying height in this way,
If the shaft 18 is rotated at 3500 rpm, the inside of the magnetic disk device 1 is sealed and there is no need to reduce the rotation speed, so that obstacles such as dirt and dust on the surface of the medium can be completely removed. .

〔Effect of the invention〕

As described above, according to the present invention, the voltage Vcc is applied between the magnetic head H and the magnetic disk medium.

If you change the voltage Vcc, f will also change, and accordingly the levitation 1
h can also be controlled.

Therefore, by changing Vcc after assembling the magnetic disk device, the flying height can be controlled and obstacles can be completely removed.

[Brief explanation of drawings]

FIG. 1 is a diagram showing the principle of the present invention, FIG. 2 is a diagram showing an embodiment of the present invention, FIG. 3 is a diagram explaining the operation of the present invention (Part 1), and FIG. 2). l...Magnetic disk device, 11...Cover, 1
2...actuator, 13...switch,
14...Actuator stand, 15, 16, 17...Magnetic disk medium, 18.
...Shaft, 19...Filter, 12
1, 122. 123. 124.125...magnetic head, ai pa2 pa3, a4 na5"'
arm. Fig. 3 Diagram explaining the operation of the present invention (Part 2) Fig. 4

Claims (1)

[Claims] In a head vanishing method in which obstacles on a magnetic disk medium forming a magnetic disk device are removed by collision energy of a magnetic head, after the magnetic disk device is assembled, the magnetic disk medium (D) is removed. While rotating, a voltage is applied between the magnetic disk medium (D) and the magnetic head (H), and the attractive force acting between the magnetic head medium (D) and the magnetic head (H) causes the magnetic head (H) to rotate. A head vanish method characterized by controlling the flying height and removing the above-mentioned obstacles.