JPS6295717A - Magnetic disc medium - Google Patents

Abstract

PURPOSE:To improve the adsorption between a magnetic disc medium and a magnetic head without lowering the sliding resistance characteristic by selecting the lubricant film thickness of a specific part of a contact start stop zone thinner than that of the other parts. CONSTITUTION:A disc 1 is driven while being fitted to a turning spindle 2 and a lubricant from a lubricant supply part 3 moved in a radial direction of the disc 1 or fixed thereto is adsorbed by the disc 1. A magnetic head stop part 5 is assumed to a part of the start top (CS.S) zone 4 of the disc 1 to provided to a mask 6. The ratio of the lubricant film thickness of the stop part 5 to the other parts is decided that the lubricant film thickness of the stop part 5 is decided at first from the permissible value not causing the adsorption depending on the relation between the adsorbing force and lubricant film thickness after for a long time and the lubricant film thickness of the parts other than the stop part from the relation between the slide resistance characteristic and the lubricant film thickness and between the characteristic with respective to the magnetic head floating and the lubricant film thickness. Then the part having a smaller lubricant film thickness than that of the other part is provided to a part of the zone 4 and the adsorption is improved without lowering the slide resistance characteristic.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to a magnetic disk medium (hereinafter referred to as a disk), and particularly to a magnetic disk medium suitable for improving the attraction phenomenon between a magnetic head and a disk.

[Background of the invention]

The conventional adsorption prevention method is contact start/stop (
(hereinafter referred to as CS-S) ・It was intended to reduce the surface accuracy of the zone, but if the surface accuracy is significantly reduced to prevent adsorption, contact between the magnetic head and the disk will occur until a high relative circumferential speed is reached. The magnetic head wears out. Further, there is a problem that adhesion cannot be effectively prevented if the surface precision is slightly lowered. Furthermore, there is a drawback that changing the surface precision of a part of the disk (C3/S zone) is difficult to manufacture.

Incidentally, related technologies of this type include, for example, Japanese Patent Publication No. 57-8530, Japanese Patent Application Laid-Open No. 57-167135,
Japanese Patent Publication No. 58-48227.

Utility Model Application Publication No. 58-159640 and the like can be mentioned.

[Purpose of the invention]

SUMMARY OF THE INVENTION An object of the present invention is to provide a disk that improves the attraction phenomenon between a magnetic head and the disk when assembled into a magnetic disk device.

[Summary of the invention]

As magnetic disk devices become more dense and reliable,
The disk needs to have improved surface accuracy so that a magnetic head with a low flying height can float safely, and at the same time, it needs to have improved sliding strength. In order to improve the sliding resistance, it is effective to form a large amount of lubricant film on the disc surface that does not cause film breakage, but on the other hand, the phenomenon of attraction between the magnetic head and the disc due to the lubricant increases, causing problems. becomes. This adhesion phenomenon further increases as the surface precision of the disc is improved, so improving sliding resistance and preventing the adsorption phenomenon have become one of the difficult technical issues that are contradictory to each other.

As a countermeasure to this problem, the present invention limits the position of the contact stop of the magnetic head on the disk surface where the attraction phenomenon occurs to a certain set range, and reduces the amount of lubricant deposited within that range so that the attraction phenomenon is small and the friction resistance is improved. We considered reducing the dynamic characteristics to the extent possible.

If the amount of lubricant applied to a part of the C5/C zone is smaller than that of other recording/reproducing areas, the anti-sliding properties of that part will decrease slightly, but since the CS/S zone is scanned less often by the magnetic head, , a sufficient margin can be secured for the anti-sliding properties.

[Embodiments of the invention]

An embodiment of the present invention will be described below with reference to FIGS. 1 to 3.

FIG. 1 is a diagram showing a method of forming a lubricating film on a disc. Disk 1
is attached to a rotating spindle 2 and rotates, and lubricant is attracted to the disk 1 from a lubricant supply section 3 that is movable or fixed in the radial direction of the disk 1. Conditions such as the rotational speed of the disc 1, lubricant concentration, suction pressure, suction time 1, and surrounding atmosphere are determined by the thickness specifications of the lubricant film formed on the disc 1, so that the amount of lubricant deposited falls within a predetermined range. Set it as follows.

In the present invention, a magnetic head stop portion 5 is assumed to be provided in a part of the C8/S zone 4 of one disk 1, and a mask 6 is provided. The mask 6 is provided with an arm 7 attached to the rotary spindle 2, which is attached to the disk 1 itself by an arm mechanism not shown, or is loaded onto and unloaded from the disk 1. Figure 1 shows the latter case,
The mask 6 is now loaded onto the disk 1. The dimensions of the magnetic head stop 5 are such that the radial direction of the disk is at least the width of the CS/S zone set in the actual disk device, and the circumferential direction of the disk is at least the width of the CS/S zone set in the actual disk device. is set to the length of the head stop area based on the positioning accuracy during contact stop, which will be described later. 1. With the mask 6 loaded onto the disc 1, normal lubricant suction is performed. A predetermined amount of lubricant adheres to the recording/reproducing area 8 and C8/S zone 4 of the disk 1 that are not covered by the mask 6, and the magnetic head stop portion 5 covered by the mask 6 is coated with a predetermined amount of lubricant.
The adhering lubricant is adjusted to the evening view using the following method.

The adjustment is performed by changing the installation time Tm of the mask 6 on the disc and the lubricant spraying time To. For example, when the lubricant film thickness of the magnetic head stop part 5 is set to O, Tm/To=1, and when the lubricant film thickness of the head stop part 5 is set to 172 of other parts, T
m/T.

= 1/2. When the mask 6 is attached to the disk 1 by an arm mechanism (not shown), it is necessary to stop the disk 1 when switching between Tm and TO.

T m / T o, that is, the ratio of the lubricant film thickness between the magnetic head stop portion 5 and other parts, can be calculated based on the adsorption phenomenon based on the relationship between the adsorption force and the lubricant film thickness when left for a long period of time, as shown in (1) in Fig. 2. The lubricant film thickness of the magnetic head stop part 5 is determined based on the allowable value that does not cause this, and then the sliding resistance and lubricant film thickness shown in (2) of Fig. 2 and the magnetic head floating shown in (3) of Fig. 2 are determined. The thickness of the lubricant film in areas other than the magnetic head stop portion 5 is determined based on the relationship between the characteristics and the lubricant film thickness.

Note that this method using a mask can also be applied to the case where a lubricant film is formed by sputtering or vapor deposition as a lubricant film forming method.

The disk 1 manufactured by the above method is stacked one or more to form a magnetic disk device 9, as shown in FIG. 3, when there are two disks in the figure. Here, the disk 1 is assembled with the magnetic head stop portion 5 having a reduced lubricant film thickness at a circumferential position corresponding to the position of the magnetic head 10. 6 When actually used in the magnetic disk device 9.

When the rotation of the disk 1 is stopped, the main rotation mechanism 12 or the fine adjustment rotation mechanism 1 is rotated at the fixed position index 11 in the disk rotation direction.
3, the magnetic head 10 is always aligned with the disk 1.
It is set so that the magnetic head stops at the magnetic head stop section 5.

According to this embodiment, even if there is no common part between the upper limit permissible lubricant film thickness range due to magnetic disk adsorption phenomenon and the lower limit permissible film thickness range due to anti-sliding properties, each film thickness portion can be calculated separately. It is possible to fabricate a disc with the following features:

〔Effect of the invention〕

According to the present invention, it is possible to create a magnetic disk medium in which a part of the C5-5 zone has a smaller lubricant film thickness than other parts, so that it can be used as a magnetic disk medium without deteriorating the anti-sliding properties. The attraction phenomenon of the magnetic head can be improved.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing a lubricant film forming method according to an embodiment of the present invention, FIG. 2 is a diagram showing the relationship between the lubricant film thickness and disk characteristics, and FIG. 3 is a block diagram of a magnetic disk device. DESCRIPTION OF SYMBOLS 1...Magnetic disk medium, 2...Rotating spindle, 3...Lubricant supply section, 5...Magnetic head stop section, 6...Mask, 10...Magnetism head. 11...Fixed position index, 12...Main rotation mechanism, 13...Fine adjustment rotation mechanism. , /2, Representative patent attorney Masaru Ogawa -1' Yoshi / ni + (11

Claims (1)

[Claims] 1. A magnetic disk medium characterized in that the lubricant film thickness in a specific part of the contact start/stop zone is made smaller than in other parts.