JPS5857633A - Burnishing method of magnetic disk medium - Google Patents

Abstract

PURPOSE:To smooth evenly the surface of a magnetic disk mediu, by floating and shifting a working head over the entire part of a magnetic disk to an even floating gap. CONSTITUTION:The slider of a working head 2 attached to the tip of a head arm 3 is set with nearly a parallel angle of inclination to the peripheral speed direction of a magnetic disk medium 1 at the inner circumference part of the medium 1 and rotated along with the arm 3 by a rotary actuator 4 at the outer circumference part. Thus the angle of inclination of the slider is increased to the peripheral speed direction of the medium 1.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for verniscaling magnetic disk media.

The magnetic head of a magnetic disk drive flies while maintaining a minute gap due to the airflow generated by the rotation of the magnetic disk.

This floating gap needs to be small to increase the storage density, and the requirements for the smoothness of the surface of the magnetic disk medium are also becoming stricter. In other words, it is a town with floating magnetic heads.

It is desirable to minimize harmful unevenness and dust on the surface of the magnetic disk medium. Therefore, in the burnishing process in the magnetic disk manufacturing process, the processing head is scanned over the surface of the magnetic disk 5 with a flying clearance one degree smaller than the flying clearance of the magnetic head during actual use, and the protrusions and dust on the surface are removed. There is.

However, in the traditional burnishing process.

The circumferential speed of the disk increases in proportion to the radial length of the position of the magnetic disk, that is, the position of the processing head.

Therefore, the floating clearance of the processing head is closer to the inner circumference.

Also, the outer circumference becomes larger. As a result, magnetic di.

High protrusions and large amounts of dust will remain on the surface of the carpet. Therefore, as a countermeasure to this problem, a method of fully adjusting the rotation speed of the magnetic disk medium can be considered, but it depends on the characteristics of the motor, the inertia of the rotation system, and the time.

There are many difficulties due to problems in between. Furthermore, the number of revolutions at the outer periphery.

If it is lowered, the processing effect will also be lowered.

The fact that small protrusions and large dust remain on the outer periphery than on the inner periphery is due to the well-known contact start, in which the magnetic head and magnetic disk medium are in contact when the magnetic head starts floating and when it stops. In the case of a stop type magnetic disk, the magnetic head collides with tall protrusions and large dust at high speed on the outer periphery, causing damage to the magnetic head.
This is a problem in terms of the lifespan of the magnetic disk.

The purpose of the present invention is to eliminate the conventional problems as described in 1 above, and to float the processing head to a uniform floating gap over the entire area of the magnetic disk medium. This is to smooth the surface in a -1,1 manner.

The feature of this invention is that in order to fully adjust the flying clearance of the machining head, tilting the head slider in the circumferential velocity direction reduces the effective relative circumferential velocity. That is, the head slider is set at the inner periphery to be approximately parallel to the circumferential velocity a direction of the magnetic disk medium, and as the head scans to the outer periphery,
(This is because the head slider is tilted at a constant rate with respect to the circumferential velocity direction of the disk medium.)

The inclination angle is adjusted so as to offset f#:, which decreases due to inclination. Burnish until the entire circumference reaches the same height.

Next, one embodiment of the present invention will be described in detail using the drawings.

FIG. 1 shows the structure of a burnishing process for a magnetic disk medium according to an embodiment of the present invention. In the figure, 1 is a magnetic disk medium, 2 is a processing head, 5 is a spacing arm, and 4 is a rotary accumulator.

At the inner periphery of the magnetic disk medium 1, the slider of the processing head 2 attached to the tip of the head arm 3 has an approximately inclination angle θin:z with respect to the circumferential speed (W) direction of the magnetic disk medium.
The outer periphery is set parallel to O.

Then, the processing head 2 is rotated together with the head arm 3 by the rotary actuator 4, and the magnetic disk medium 10 is rotated by the rotary actuator 4.
The inclination angle is θo1Lt with respect to the circumferential velocity direction. The magnitude of the inclination angle is determined by the length of the arm 3.

Figure 2 shows the relationship between the circumferential speed of the magnetic disk medium and the machining head and the floating groove when the circumferential velocity direction and the inclination angle of the machining head slider are all constant. c(It VC
+The relationship between the inclination angle and the flying clearance when the circumferential speed is constant (2) of the machining head.

Figure (3) shows the relationship between the radial position of the magnetic disk medium and the flying clearance.

The method for setting the inclination angle J1 will be described below. Now, when the machining head slider is tilted, the lift wind is related to the shape of the pressure receiving part of the machining RAD slider.

Assuming that changes in the number are not taken into account, it may be assumed that the change in flying clearance is only related to the effective circumferential velocity for the slider. In other words, floating plow: h, inclination angle 2θ
, radius work γ, rotation speed: ω, circumferential speed IQ: y, effective circumferential speed 1! I: 7ngct1, and 1°, 71- γω ■7Jγeα
1- or α young ■ h-f (υrta1) ■.

In Fig. 2 (1), if the circumferential velocity direction and the inclination of the machining head are equal at the positions of the inner radius and the outer radius γout, then the effective circumferential velocity of the inner and outer circumferences lrgal −i
From formula 00, n is smaller than lrgal-owt,
The floating clearance hin on the inner circumference is the floating clearance on the outer circumference.

It will be smaller than mahout. In addition, in FIG. 2 (2), for example, the peripheral speed υout at the outer peripheral portion γou, t
.

When is constant, (from the equation), as the inclination angle θ increases from 01 to θ, the effective circumferential speed υγcal decreases and the flying clearance h2 becomes smaller than hl. of radius γin.

Inclination angle θ0rLt between inclination angle θin and outer radius γout
kνrgal-in -1in-〇in ■'l
h-gal-owt z 1outωcosθout
■υreal-in -1) real-ou, t
■ 1. .

All you have to do is choose Tonarokoun. That is, θ at an arbitrary radius γ is set to γωfishθ% cone t Vc.

Although the length of the rad arm can be easily determined by obtaining θ as described above, strictly speaking, the γωC portion θ is not constant at the middle circumference.

As a result, the processing head 2 looks like that shown in FIG. 2 (3).

Furthermore, under the condition that the rotational speed of the magnetic disk medium 1 is fixed, burnishing can be performed over the entire area of the magnetic disk medium 1 to a certain flying clearance.

With the structure described above, the magnetic disk medium can have uniform smoothness over the entire inner and outer periphery without any protrusions or dust that exceed the desired height, and in particular, the contact start stop Is it possible to demonstrate the effect in the case of a method?

[Brief explanation of drawings]

Figure 1 is a block diagram of the burnishing process, Figure 2 is the circumferential speed,
FIG. 3 is a diagram showing the relationship between the inclination angle and the floating trench. 1: Magnetic disk medium, 2: Processing head 3: Head arm, 4: Rotary actuator.・7-7 1 Illustration 2 Illustration

Claims (1)

[Claims] At the head slider (inner circumference of the magnetic disk medium),
The magnetic head is made to float parallel to the circumferential speed direction of the disk and at an angle to the circumferential speed direction at the outer circumference, thereby achieving a uniform head flying clearance over the entire area from the inner circumference to the outer circumference of the disk. Burnishing of disc media], 1 method.