JPS5922288B2 - Manufacturing method for magnetic disk media - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method of manufacturing a magnetic disk medium, and particularly to a method for manufacturing a magnetic disk medium.
rnish) process.

A magnetic disk medium is used as a recording medium in a magnetic disk device.One or more magnetic disks are mounted on a spindle, rotated at a predetermined number of rotations, and a magnetic head is mounted on the magnetic disk medium. The magnetic disk is levitated at predetermined intervals by an air flow generated by the rotation of the magnetic disk to perform recording and reproduction on the magnetic disk.

In such a magnetic disk device, the flying distance between the magnetic disk and the magnetic head is as narrow as several microns, so the surface of the magnetic disk medium is required to be smooth.

Recently, a contact start/stop (CSS) type magnetic disk device has been announced, in which the magnetic head makes contact with the magnetic disk medium when the rotation of the magnetic disk medium starts and stops.
Furthermore, smoothness of the surface of the magnetic disk medium is required.

Currently, such magnetic disk media are manufactured using the following process. (1) For example, the surface of an Al (aluminum) substrate used as a disk medium is subjected to an alumite treatment or the like to make the surface smooth.

(2) The disk substrate whose surface has been smoothed is rotated at a predetermined rotational speed, and a magnetic paint is applied by spin coating to form a magnetic coating film.

(3) After that, the substrate that has become the magnetic disk is baked and hardened.

(4) After that, in order to make the coating film formed on the disk substrate a predetermined thickness and to macroscopically smooth the coating surface, the coating surface of the magnetic disk medium is covered with wrapping tape or cloth. (polishing process).

(5) Thereafter, protrusions remain on the magnetic disk medium that cannot be removed in the previous polishing process.

Therefore, this protrusion is scanned sequentially over the magnetic disk medium from the outer side to the inner side using one simulated head (burnishing head) with a flying height smaller than that of a normal magnetic head. The protrusion is removed by colliding the simulated head with the protrusion (burnishing hammer).

However, this burnishing process had the following drawbacks. This burnishing process requires more than one hour to process one sheet of media, resulting in poor productivity.

Furthermore, as for CSS type media, the current dummy head leaves a protrusion smaller than the flying height of a normal magnetic head, which causes the magnetic head protrusion to re-crash at the time of contact start/stop. (It was impossible to remove the protrusions using current methods.) Also, since this mock head uses only the slider section of a normal magnetic head, the side facing the magnetic disk medium surface is Since the slider surface is smooth, it only makes point contact with the protrusions of the medium, making it impossible to remove the protrusions efficiently.As described above, the current burnishing process has various drawbacks.

Therefore, it is an object of the present invention to provide a new burnishing process that eliminates the above-mentioned drawbacks.
In the burnishing step in the manufacturing process of magnetic disk media, the surface of the magnetic disk medium is brought into continuous contact with a simulated head, and an acoustic emission element is provided on the head to perform burnishing while observing the waveform. It can be achieved by doing.

The present invention will be explained in detail below with reference to the drawings. FIG. 1 shows an embodiment of the burnishing step in the manufacturing process of the magnetic disk medium of the present invention.

Furthermore, in the figure, 1 represents a magnetic disk medium, 2 represents a mock head, and 3 represents an arm. As mentioned above, in the burnishing process, after polishing the surface of the magnetic disk medium 1 in the preceding polishing process, the protrusions left by the polishing are removed by the dummy head 2, but unlike the conventional burnishing process, the dummy head 2 removes the protrusions left by the polishing process. When head 2 is used, protrusions smaller than the flying height will remain.

Therefore, if the aforementioned protrusion remains in a magnetic disk medium for contact start/stop, this protrusion will come into contact with the magnetic head during start/stop of the magnetic head.
It is undesirable as it causes head crash. Therefore, in the present invention, the magnetic disk medium 1 is rotated while the dummy head 2 is kept in contact with the magnetic disk medium 1 without being levitated, and the arm 3 to which the dummy head 2 is attached is connected to the dummy head 2 of the arm 3. Driven by a voice coil motor (not shown) provided on the opposite side of the magnetic disk medium 1, the pseudo head 2 is moved over the magnetic disk medium 1.
The projections on the magnetic disk medium 1 are completely removed by scanning. This dummy head 2 is designed so that the surface facing the magnetic disk does not float in order to prevent the slider portion from levitating, or by pressurizing the dummy head 2 to suppress levitation, or even to prevent the rotation of the magnetic disk medium 1. By either lowering the magnetic field or lowering the magnetic field, more contact can be made with the magnetic disk medium. When performing the burnishing process using the method of the present invention, as shown in FIG.
As a result of observing the waveform from the element installed on the gimbal spring that connects the arm supporting the dummy head 2 and the dummy head 2, and where the vibration of the head is caused by strain, the waveform shown in Figure 2 1 is output, and the magnetic disk medium is It can be seen that there are many upper protrusions, but after the burnishing process, as shown in FIG. 2, almost no output waveform is output.

As described above, in the present invention, since the waveform is observed using the acoustic emission element and the finished state of the medium surface is observed, very accurate surface processing can be performed by the burnishing process.

As a result, it can be seen that most of the protrusions on the magnetic disk medium 1 could be removed.

As described above, in the burnishing process of the present invention, all protrusions on the magnetic disk medium can be removed, making it possible to create a magnetic disk medium compatible with the contact start/stop method.

[Brief explanation of drawings]

FIG. 1 shows an embodiment of the burnishing step in the manufacturing process of the magnetic disk medium of the present invention, and FIG. 2 shows the output waveform of an acoustic emission device. Furthermore, in the figure, 1 represents a magnetic disk medium, 2 represents a mock head, and 3 represents an arm.

Claims (1)

[Claims] 1. In the burnishing step in the manufacturing process of magnetic disk media, a simulated head is brought into continuous contact with the surface of the magnetic disk medium, and an acoustic emission element is provided on the head to perform burnishing while observing the waveform. A method of manufacturing a magnetic disk medium, characterized in that: