JPH0441169A - Disk polishing method - Google Patents

Abstract

PURPOSE:To prevent a polishing unevenness by making the movement of a pressurizing roller soft-landing on the disk surface with its crawling immediately before the pressurizing roller abutting on the disk surface by a variable speed motor. CONSTITUTION:Pressurizing rollers 10a, 10b are displaced at a high speed by a variable speed motor 17 until just before their abutment on a disk 1 and can be subjected to soft landing on the disk 1 by displacing them with crawling while displacing them from just before their abutment on the disk 1 until the positional state that the specific pressurizing force acts. Namely since the abutment of the pressurizing rollers 10a, 10b on the disk 1 is not performed impactly, the bound and vibration of the pressurizing rollers 10a, 10b due to the face deflection accompanied by the rotation of the disk 1 are not caused. The polishing unevenness on the surface of the disk 1 can thus be prevented.

Description

Detailed Description of the Invention [Industrial Field of Application] The present invention involves polishing the surface of a disk as a recording medium, such as a magnetic disk or an optical disk. [Prior Art] In the manufacturing process of a magnetic disk, sputtering, etc. Before the magnetic material is applied to the recording surface by means of the method described above, the surface of the magnetic disk is polished, so-called texturing. This texture processing involves placing an abrasive tape in contact with the surface of the disk and rotating the disk while ejecting magnetic particles, thereby creating minute scratches in the circumferential direction of the disk surface. .

The above-mentioned pressing of the abrasive tape onto the disk surface is usually performed using a pressure roller, and the pressure roller is connected to a driving means such as a cylinder via a parallel leaf spring. This drive means displaces the pressure roller in the direction of pressing it against the disk surface, and by bending the parallel plate spring, a predetermined pressing force is exerted.

[Problem to be invented or solved] Due to its nature, the polishing process on the surface of the disk must be uniform over the entire surface of the disk. However, when polishing is performed using the above-mentioned conventional technique, polishing unevenness occurs, although it is not noticeable to the naked eye. This polishing unevenness usually appears as a plurality of striped scratches in the radial direction on the disk surface, that is, dark and light stripes of scratches. In particular, if there is surface runout or the like during rotation of the disk, the occurrence of dark and light stripes due to scratches becomes even more noticeable.

Therefore, the inventor of the present invention researched the cause of this uneven polishing and found that when the pressure roller presses the abrasive tape against the surface of the disk, an impact is applied, and there is a gap between the pressure roller and its driving means. Since a spring is interposed to exert force when the pressure roller presses against the disk surface, the parallel leaf spring vibrates when the pressure roller comes into contact with the disk, causing the pressure roller to press against the surface of the disk. The present invention was completed based on the knowledge that the scratches caused by the abrasive tape are caused by the abrasive tape partially enlarging as it bounces or vibrates on the disk surface.

Therefore, an object of the present invention is to provide a disk polishing method that can prevent uneven polishing from occurring in the radial direction on the surface of the disk when polishing the surface. .

[Means for Solving the Problems] In order to achieve the above-mentioned object, the present invention provides a method of pressing an abrasive tape on both the front and back surfaces of the disk for polishing the surface of the disk as a recording medium such as a magnetic disk or an optical disk. a pair of pressure rollers, and a variable speed motor for displacing each pressure roller in a direction in which it is pressed against the disk, and immediately before the motor brings the pressure roller into contact with the disk surface, The feature is that the movement of the pressure roller is slowed down to produce soft launch ink on the disk surface.

[Function] By adopting such a configuration, pressing of the abrasive tape against the disk surface by the pressure roller can prevent contact marks, dents, etc. from occurring, resulting in uneven polishing. be able to. In addition, the machining speed and efficiency can be improved by controlling the displacement stroke of the pressure roller so that it is displaced at high speed just before it comes into contact with the disk, and then decelerated just before it comes into contact with the disk. It is possible to try to maintain it.

[Embodiment 1] Hereinafter, embodiments of the present invention will be described in detail based on the drawings.

First, FIGS. 1 and 2 show a schematic configuration of an apparatus for implementing the method of the present invention.

In the figure, reference numeral 1 indicates a disk as an annular recording medium such as a magnetic disk, and the disk 1 is clamped by a spindle 2 and driven to rotate. While the disk 1 is rotationally driven, the polishing process is performed by pressing the polishing tape 3 on both the front and back surfaces. In order to press this abrasive tape 3 onto the disk 1, a pair of pressure rollers 10a,
10b is used.

These pressure rollers 10a and 10b are attached to the bracket 1
It is rotatably supported by brackets 1a and llb, and these brackets lla and llb are support blocks 12a.

12b. The support blocks 12a, 12b are connected to slide blocks 14a, 14b via parallel plate springs 13a, 13b. The slide blocks 14a, 14b are attached to pole nuts 15a, 15b, and a ball screw 16 is inserted through each ball nut 15a, 15b, and the ball screw 16 is driven to rotate by a motor 17. It has become. Furthermore, 1
8 is a guide rail that guides the ball nuts 15a and 15b.

Here, the motor 17 is composed of a variable speed motor, and when the motor 17 is operated to rotate the ball screw 16, the pole nuts 15a and 15b are slid in the direction of approaching or separating from each other. There is.

The present invention textures the surface of the disk 1 using the above-described apparatus configuration.Next, the polishing method will be described.

First, the abrasive tape 3 is brought into contact with the pressure rollers 10a and 10b, respectively, and the pressure rollers 10a and 10b are kept separated from each other as shown in FIG.
, 10b.

In this state, by rotating the disk 1 with the spindle 2 and operating the motor 17,
Rotate the ball screw 16. As a result, the pole nuts 15a and 15b are displaced toward each other, and
The pressure rollers 10a, 10b connected to the pole nuts 15a, 15b are displaced in a direction closer to each other, so that the abrasive tape 3 is brought into contact with both the front and back surfaces of the disk 1. Then, by feeding the polishing tape 3 with a polishing liquid containing magnetic particles and sending the polishing tape 3 in the direction shown by the arrow in FIG. 2, the surface of the disk 1 is polished and the circumference is A texture process is performed that creates minute scratches in the direction.

Here, the abrasive tape 3 by the pressure rollers 10a and 10b is
For example, 2 kg/c when in contact with the disk 1
It is necessary to apply a predetermined pressing force of about n+ to 5 kg/cm, and this pressing force is applied to the parallel leaf spring 13a.

It is obtained by bending 13b by a predetermined amount.

Therefore, the pressure roller 10a due to the operation of this motor 17
, 10b, as shown in FIG.
The pressure rollers 10a, 10b are moved at high speed until just before they contact the disk 1. These pressure rollers 1. At a position immediately before Oa and 10b contact the disk 1, the displacement speed is reduced and the Oa and 10b are brought into contact with the disk 1 at a very slow speed. Even after the pressure rollers 10a, 10b come into contact with the disk 1, the displacement continues, and the parallel plate spring 13a.

By displacing the disc 13b to a state where it is bent by the predetermined amount described above, the disc 1 is moved to the pressure roller 10a.

10b, and pressurized by the action of the parallel leaf springs 13a, 13b.

In this way, the pressure rollers 10a and 10b are displaced at high speed until they come into contact with the disk 1, and are moved at a slow speed from just before they come into contact with the disk 1 until they are displaced to a position where a predetermined pressing force is applied. By displacing the pressure roller loa.

10b to make a soft landing on the disk 1, and when it comes into contact with the disk 1, a shock may be applied,
There is no bounce or vibration caused by the return of the parallel leaf springs 13a, 13b, and there is no inconvenience that the disk 1 will have dark and light stripes of scratches in the radial direction due to contact marks, dents, etc. Furthermore, even if there is surface runout when the disk l rotates, the pressure rollers 10a and 10b do not come into contact with the disk 1 in an impactful manner, as described above, so the pressure due to this surface runout is Rollers 10a, 10
There is no bounce or vibration of b. Furthermore, the pressure rollers 10a, 10b are displaced at high speed just before they come into contact with the disk 1, so the slow speed range of the pressure rollers 10a, 10b is extremely small in terms of their entire displacement stroke. (Since the amount is small, there is no problem of slowing down the processing speed.

In the above-mentioned embodiment, the case where the texture processing of the disk 1 is performed has been explained, but the present invention can also be applied to the entire case where the surface of the disk 1 is polished, such as lapping, for example.

[Effects of the Invention] As explained above, in the present invention, by slowing down the movement of the pressure roller immediately before the motor brings the pressure roller into contact with the disk surface, a soft landing is created on the disk surface. Since the ink is applied, no impact is applied when the pressure roller contacts the disk during surface polishing of the disk, and there is no risk of uneven polishing occurring on the disk.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention, and include rollers,
13a, 13b: Parallel leaf spring, Ila, ll
b Bracket, 12a, 12b: Support block, 13a. 13b: Parallel leaf spring, 14a, 14b Nisrite block, 15a, 15b: Ball nut, 16
:Ball, 17:Motor.

Claims (1)

[Claims] A pair of pressure rollers for pressing an abrasive tape on both the front and back sides of the disk for polishing the surface of a disk as a recording medium such as a magnetic disk or an optical disk, and each pressure roller is displaced in the direction of pressing the disk against the disk. a variable speed motor for bringing the pressure roller into contact with the disk surface, and immediately before the motor brings the pressure roller into contact with the disk surface,
A disk polishing method characterized in that the movement of the pressure roller is slowed down to cause a soft landing on the disk surface.