JPS5925285B2 - Burnishing method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a surface smoothing operation (burnishing process) which is a manufacturing process of a magnetic recording medium such as a magnetic disk, and particularly to a surface smoothing operation of a magnetic medium coating film of a magnetic disk.

Conventionally, when finishing the surface of magnetic media other than those used in magnetic disk drives, the surface has been polished to remove protrusions through a burnishing process.

In order to meet the demand for increased recording capacity, recent magnetic heads for detecting and reproducing magnetic recording are increasingly required to get closer to the surface of the recording medium, and the distance between them is less than 0.5 μm for magnetic disks. There is a need to further reduce the thickness to 0.35 μm or less. With such fine spacing, in the conventional burnishing process, the slider edge that cuts the protrusions gently hits the protrusions, resulting in poor cutting efficiency and the inability to sufficiently remove protrusions from the surface of the magnetic medium, resulting in the formation of a magnetic head. This has the drawback of damaging the magnetic core and slider, and in severe cases, causing damage to them and collision with the surface of the magnetic medium, that is, a crash. Therefore, it is an object of the present invention to provide a new burnishing method that eliminates the above-mentioned drawbacks.The purpose of the present invention is to improve the surface finish of magnetic recording media in the burnishing process, which is a manufacturing process of magnetic recording media such as magnetic disks. This can be achieved by performing burnishing while applying vibration to the burnishing head in the direction of head movement. An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a sectional view showing the relationship between a magnetic medium protrusion and a core slider.

The core slider 1 has a core portion 2 on the rotation direction side of a magnetic medium 3 formed on a rotating disk, and floats by receiving the surface wind 6 generated by the rotating disk.

The space between the magnetic medium 3 and the core slider 1 extends to the core slider floating length 4. The magnetic medium 3 has surface protrusions 5 which are burnished to a desired surface smoothness to prevent the core slider 1 and the core portion 2 from being damaged by the surface protrusions 5.

FIG. 2 shows a configuration diagram of an apparatus according to an embodiment of the present invention.

A rotating disk, ie, a magnetic disk □, on which the magnetic medium 3 is applied, has its rim driven by a motor with a belt. The burnishing head assembly H according to the present invention uses the same device as the conventional device, and its structure is shown enlarged because it is minute.

The circuit SER that drives this burnishing head assembly H
VO is a seek drive unit SK- that drives the burnishing head assembly H in the normal read/write head seek direction.
It is composed of a vibration 1 drive section B-SB which generates minute vibrations many times in the seek direction or the flying direction in the burnishing head H during burnishing in the seek direction.

The operation of this device is shown in the burnishing situation explanatory diagram of FIG. 3.

Regarding the surface protrusion 5 appearing on the surface of the magnetic medium 3 in the figure,
The burnishing head 9 moves gently in the seek direction from right to left in the figure, vibrates in the seek direction or floating direction, and has an effective cutting speed for the tip 8 which is in contact with the burnishing surface at the tip of the surface protrusion 5. collide with.

The vibration frequency (FCHz) of the burnishing head 9 is determined experimentally depending on the relationship between the rotational speed (NCvp) of the magnetic medium and the vibration amplitude (ACmlL).
] = 3・product, a-0. ``We got good results.

This vibration frequency is determined in order to shorten the burnishing time, but the optimum frequency is three times the rotational speed.

This is set so as not to reach the resonant frequency of the structure around the burnishing head, and is determined by the number of protrusions per unit area of the magnetic medium 3.

That is, since the repetition period in which the protrusions exist is below this frequency, optimal burnishing can be performed by adding vibrations of this frequency. Furthermore, the vibration amplitude was set at 0.1 mm1 because if the vibration amplitude is less than this, the burnishing speed due to the vibration during burnishing will not improve, and if the frequency is higher than this, the burnishing head will cause unnecessary vibrations. This is because it causes a phenomenon that causes scratches on the magnetic medium.

Although the burnishing time is not absolutely determined depending on the material of the medium and other conditions, the burnishing time can be shortened to less than the time required by the conventional method.

As described above, according to the method of the present invention, magnetic disk burnishing work with a high degree of uniformity of smoothness can be quickly achieved using a simple additional device, and its effects are significant in terms of quality and
This is huge in terms of cost.

[Brief explanation of drawings]

FIG. 1 is a sectional view showing the relationship between the magnetic medium protrusion and the core slider, FIG. 2 is a diagram showing the configuration of an apparatus according to an embodiment of the present invention, and FIG. 3 is a diagram illustrating the burnishing situation. In the figure, 1 is a core slider, 2 is a core part, 3 is a magnetic medium, 4 is a core slider flying height, 5 is a surface protrusion, 6 is a surface wind, 7 is a magnetic disk, 8 is a surface protrusion tip, 9 is a Burnish head, H is burnish head assembly, SER
VO is the drive circuit, SK-SB is the seek drive unit, VB-S
B is the vibration 1 drive unit.

Claims (1)

[Claims] 1. A burnishing process that is a manufacturing process for magnetic recording media such as magnetic disks, in which burnishing is performed while applying vibration to a burnishing head for finishing the surface of the magnetic recording medium in the head movement direction or flying direction. Method.