JPS59117735A - Processing method of magnetic disc face - Google Patents

Abstract

PURPOSE:To eliminate easily and surely even a long scratch by pressing a wrapping tape on a magnetic disc face, and vibrating an unpressed roller in parallel with a magnetic disc face while turning the magnetic disc. CONSTITUTION:While the disc 1 is turned in a high speed, a new wrapping tape 3 paid off from a supply roller 5 by means of a pressing roller 4 arranged radially on the disc 1 at all times is pressed on the disc face and wrapping is attained. In this case, a horn 11 coupled to an ultrasonic wave oscillator 10 is pressed on the end face of the pressing roller 4 and the pressing roller 4 is vibrated in ultrasonic wave by the method of this invention. As a result, the wrapping tape is vibrated minutely and even a long scratch is eliminated easily and surely.

Description

Detailed Description of the Invention +81 Technical Field of the Invention The present invention relates to a method for determining the plane tfi degree of the surface of a magnetic disk (a magnetic disk serving as a storage medium) of a magnetic disk device used as an external storage device of a computer. Regarding processing methods.

(Background of BL technology) Magnetic disk devices are magnetic disks (hereinafter referred to as ``disks'').
While rotating the disk at high speed, information is read and written to the magnetic field using the magnetic disk 71-.In this case, information is read and written with the magnetic heel 1 in contact with the disk surface, and a number of magnetic heads are used. There is a method of reading and writing by floating the disk about μ above the disk surface. In the case of a floating type device, there are two methods in which the magnetic head floats on the disk surface and is unrolled, and the other is when the magnetic head comes into contact with the disk surface at the start and end of disk rotation, causing the disk to rotate. There is a method in which the disk surface floats only while it is rotating at high speed.

Even in the case of a floating type, the gear between the disk surface and the magnetic disk is extremely small, so if there is a scratch on the disk surface, it will cause a head crash, and the magnetic particles generated at that time will further damage the disk surface. There is a risk of injury. Furthermore, even small scratches that do not result in hentocrasochs may cause unstable magnetization during information writing, making it impossible to rewrite the information reliably, leading to errors in reading and writing information.

In order to prevent this from happening, the disks are made from aluminum disks that have been machined to have a high level of surface accuracy. After applying a magnetic coating, drying and cleaning, the discs are further treated with a lanovin process to achieve a high level of surface accuracy. That's what I do.

fcl Prior Art and Its Problems FIG. 1 shows a conventional disk surface lapping device, in which (a) is a plan view and (b) is a front view. 2 is a disk, which is placed on a circular surface plate 2 and rotated by a motor M at high speed.

A wrapping tape 3 is made of an elastic material such as rubber, and is pressed onto the surface of the disk 1 by a 2-ra 4.

The wrapping tape 3 is fed out from the feeding roller 5,
It is supplied to the pressure roller 4 side through the guide roller 7, and lapping is always performed on a new surface. After use, the wrapped cheese is transferred to the winding roller 6 via the roller 8.
It is wound up.

Without rotating the disk 1 at high speed in this way, the lapping tape 3 is pushed onto the disk surface by a pressure roller 4 arranged in the radial direction of the disk, thereby finishing the disk surface with lapping.

However, with this method, although short scratches can be removed relatively easily, long scratches such as those shown by 9 cannot be removed. Particularly, when polishing is performed using the wrapping tape 3 after applying the magnetic paint, foreign objects may be caught and scratches may occur in the circumferential direction. Such circumferentially extending scratches are particularly difficult to remove.

If the width of the wrapping tape and the length of the pressure roller are short, the entire surface of the disk 1 can be wrapped by moving the pressure roller 4 and the wrapping tape 3 in the radial direction of the disk 1. Similar problems are inevitable.

fd) Purpose of the Invention The purpose of the present invention is to solve these problems in the conventional disk lapping process and to realize super-finishing that allows even long scratches in the circumferential direction to be easily and reliably removed. do.

te1 Structure of the Invention In order to achieve this object, the present invention presses the wrapping tape against the magnetic disk surface with a pressure roller while rotating the magnetic disk, and vibrates the pressure roller in a direction parallel to the magnetic disk surface.・We are using the Shiro method.

(11 Embodiments of the Invention) Next, how the disk surface processing method according to the present invention is actually implemented will be explained by way of embodiments.

FIG. 2 shows an embodiment of the method of the present invention, in which (A) is a plan view and (+=1) is a side view. Components identical to those of the conventional device shown in FIG. 1 are given the same reference numerals.

That is, while the disk 1 is being rotated at high speed, a pressure roller 4 disposed in the radial direction of the disk 1 presses a new wrapping tape 3 fed out from a feeding roller 5 onto the disk surface to perform lapping. At this time, in the method of the present invention, the bone 11 coupled to the ultrasonic vibrator 10 is pressed against the end face of the pressure roller 4, and the pressure roller 4 is ultrasonically vibrated. When the bone 11 is pressed against the end face of the pressure roller 1: I-ra 11 arranged in the radial direction of the disk as shown in the figure and is vibrated, the pressure roller 4 and the lapping tube are moved as shown by the arrow a1. 3 slightly vibrates in the radial direction of the disk 1.

In this way, in addition to the rotation of the disk 1, when lapping is performed by slightly vibrating the pressure roller 4, the lapping tape crystals in contact with the disk surface are also slightly vibrated, so even long scratches can be easily and reliably removed. Wear out/disappear. In particular, as shown in the examples, if the scratches are slightly vibrated in the direction intersecting the scratches 9, they can be removed very effectively.

In the example, a rubber roller with a diameter of 55φ was used as the pressure roller 4, and a wrapping tape 3 with an abrasive grain of 3μ was used. In addition, the ultrasonic generator has a vibration frequency of 1
1 at 0-301Iz. Vibrations were applied to the pressure roller 4 by generating slight vibrations with an amplitude of 1 to 2 mm.

As a result, a disk with high surface precision and no long scratches was obtained.

Although an example is shown in which an ultrasonic vibrator is used as a means for applying micro-vibrations, other excitation means may also be used. Moreover, the pressure roller 4 can also be arranged in a direction other than the radial direction of the disk 1.

(g1 Effects of the Invention As described above, according to the present invention, the wrapping tape is pressed against the disk surface by a pressure roller while rotating the magnetic disk, and the pressure roller is vibrated in a direction parallel to one disk surface. Therefore, even long scratches can be easily and reliably removed due to the slight vibrations of the Lanovink tape in combination with the high-speed rotation of the disc, and the long scratches that occur during the first application are removed. This also improves the accuracy of the coated surface.As a result, it is possible to create a highly reliable disk with fewer errors when reading information.Moreover, the edge surface of the pressure roller By using it to give a slight vibration uJ,
Microvibrations can be easily generated and the equipment is simple.

[Brief explanation of the drawing]

Fig. 1 is a plan view and a side view showing a conventional disk surface machining method, and Fig. 2 is an embodiment of the disk surface machining force method according to the present invention. ) is a side view. In the figure, ■ is a disk, 3 is lasso pink tape, 4 is
is a pressure roller, 5 is a feeding roller, 6 is a take-up roller,
9 is a scratch, 10 is an ultrasonic vibrator, and 11 is an ultrasonic horn. Patent applicant Fujitsu Co., Ltd. Agent Patent attorney IT Minoru Yanagi Figure 1 Figure 2

Claims (1)

[Claims] While rotating the magnetic disk, the wrapping tape is pressed onto the magnetic disk surface with a roller, and the pressure roller is vibrated in a direction parallel to the magnetic disk surface. Processing method.