JPS62141632A - Manufacture of magnetic disk medium - Google Patents

Abstract

PURPOSE:To reduce the height of a projection by reducing force of tangential direction of a burnishing head, applying force of vertical direction, and pushing the projection on the surface of a magnetic disk medium in a substrate. CONSTITUTION:A magnetic disk medium 1 is mounted on a spindle 2 using a clamp 3 and rotated. A burnishing head 4 attached to a carriage 5 on the magnetic disk medium is floated at the height at which floating test is to be made, and moved on the surface of the magnetic disk medium by a stepping motor 7. A sensor 8 for detecting projection is attached to the burnishing head and connected to a projection detecting circuit 9. Further, a vibrator 10 is also attached, and impact is applied to the burnishing head by vibration pulse generated by the vibrator 11. Thus, the height of floating is reduced, and the projection is pushed to the face of an aluminum substrate.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of the Invention] The present invention relates to a method of manufacturing a magnetic disk medium, and in particular, to a method of manufacturing a magnetic disk medium that has good floating characteristics and does not increase defects on the magnetic film surface.

[Background of the invention]

The conventional manufacturing method is for vanilla sea, which consists of a slider with high hardness, such as alumina single crystal.

The purpose of the RAD is to make it float at a low level above the surface of the magnetic disk medium to remove protrusions on the surface of the magnetic disk medium. It has been revealed that if there are no protrusions, the varnish may peel off or fall off, causing scratches, clutches, coating defects, and poor appearance. Therefore, a method has been proposed in which burnishing is performed while applying low movement to the burnish head in the head movement direction or flying direction, as described in Patent No. 59-25285. If a large number of protrusions cannot be removed in one go, a problem arises in which verniracy must be repeated many times. In this case ~ Published by IBM
J' D B February 1972 Vot21. A9
All you have to do is focus on the parts of the protrusions detected like t'P5761 to PP5762, but this is based on the premise that the horizontal side impact force will be used to finish them off, and as mentioned above. There is a problem of scratch generation.

[Purpose of the invention]

SUMMARY OF THE INVENTION An object of the present invention is to provide a method of manufacturing such a magnetic disk medium that is effective in reducing the roughness of protrusions that impede the flying of the magnetic head without increasing defects on the film surface. [Summary of the Invention] Conventional burnishing methods aim to cut the surface protrusions of the magnetic disk medium in the direction of contact, but the burnishing head's floating position is Since it is not completely parallel to the plain surface of the disk medium, a component force in the vertical direction also acts. The present invention focuses on this point and attempts to achieve burnishing by reducing the tangential force and applying a perpendicular force from the applying section to push the protrusions on the surface of the magnetic disk medium into the substrate. It is something.

[Embodiments of the invention]

An embodiment of the present invention will be described below with reference to FIG. 1 magnetic disk medium 2. 3. on the spindle. Attach using a clamp and rotate. 5. on a magnetic disk medium. Attach to carriage & tut 4. The burnish head is levitated at the point where the levitation test is to be performed, and is moved over the surface of the magnetic disk medium by a stepping motor 7 via a 6 feed screw. 4. An 8-protrusion detection sensor is attached to the burnish head, and is connected to the 9-protrusion detection circuit. A vibration exciter is also attached, and the imaging pulse generated by the 1t vibration exciter causes 4. You can add @ army to Burnish Head. The output of the nine protrusion detection ports is 12. Synchronization is introduced into the circuit, and the position of the generated pulses of the 11 vibrators can be made to be exactly the same.

4. The burnish head rotates. 1. When the 8-protrusion detection sensor detects a protrusion while moving in the radial direction on the magnetic disk medium, the burnish head detects 9 protrusions.

12. The detected angle and radial position of the protrusion are stored in the synchronization circuit. 4. The burnish head stops moving at that radial position, and in the next rotation, when the position of the protrusion is directly below the burnish head, the synchronous circuit 12 sends a signal to the exciter 11, and a shock pulse is sent to the exciter 11. When a vertical impact is applied to the 4-burnish head using a 1° vibrator, the flying height of the 4-burnish head decreases and the protrusion is pushed into the aluminum substrate surface. Second
Figure (α) is the output of the 8-protrusion detection sensor, (b) is the output of the 9-position camera, and (C) is the output of the 4. This shows the temporal relationship of the change in the floating height of the Parnisch head. It would be better to shift the generation time of the adder forward. In this way, the protrusion detection and impact are repeated, and when the protrusion is no longer detected, 4. The burnish head moves to the next half-pole position between the writings.
4 at this time. The flying height of the burnish head shall be the same as the flying height during normal flying tests. Alternatively, use the protrusion detection head in step 4. If installed separately from the burnisher head, 4. The flying height of the burnish head may be higher than that.

4・'<-3 The amplitude and time of the applied impulse are determined by 4. Dimensions of the burnish head,
Do I have to change it depending on the floating type and vibration characteristics?
In the case of this implementation τ', the amplitude is 10 to 100 G and the time is 10 to 100 μs.

〔Effect of the invention〕

According to the present invention, since the flying height of the burnish head can be reduced, the magnetic disk medium fi as shown in FIG.
Since the side impact energy between the protrusions on the surface and the burnish head can be reduced, the occurrence of surface defects due to falling off or dragging of the protrusions can be reduced by one order of magnitude or more. Furthermore, by embedding the protrusions in the aluminum substrate by applying a vertical force W from the outside, it is possible to obtain a flying characteristic that is equal to or better than that of the conventional device.

[Brief explanation of drawings]

FIG. 1 is a front view of an embodiment of the present invention, FIG. 2 is an explanatory diagram showing the time relationship of each signal, and FIG. 3 is a schematic explanatory diagram of the difference between the conventional system and the present invention. 1... Magnetic disk medium 9... Protrusion detection circuit 10... Vibrator 3... Clamp 11... Vibrator 4... ... Burnish head 12 ... Synchronous circuit 5 ... Carriage 14 ... Magnetic film 7 ... Stepping motor 15 ... Aluminum substrate 8... Protrusion structure sensor tower 1 Figure 2 Figure

Claims (1)

[Claims] 1. A method for manufacturing a magnetic disk medium, characterized in that the burnish head is vibrated in the vertical direction in synchronization with the position of the detected protrusion to embed the surface protrusion in the substrate.