JPH10320735A - Magnetic disk device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make grease decomposable with photo-catalysis even when the grease scattered from a spindle bearing, a pivot bearing are stuck to a slider and to prevent adhesion between the slider and a magnetic disk by providing a meterial layer containing at least an anatase type titanium dioxide on the surface opposite to a magnetic disk of the slider and the side surface of the slider. SOLUTION: The slider 3 is supported by a carriage 5 through a suspension 4, and the spindle 2 and the carriage 5 are set on a base 6. A rail is formed on the surface opposite to the magnetic disk of the slider 3, and the substance containing the anatase type titanium dioxide on the rail, blade of the slider 3 and the slider side surface. Even when lubricant and grease are stuck to the slider 3, an optical catalysis reaction occurs due to ultraviolet rays from a light source in a magnetic disk device, and the surface of the titanium dioxide is made a strong acid, and they are oxidized and decomposed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic disk drive having a slider on which a magnetic head is mounted, and more particularly, to a method in which titanium dioxide having a photocatalytic function is provided on the surface of the slider, and light is applied to an attached lubricant or grease. It is suitable for a magnetic disk device, an external storage device, a disk array, a server, a computer, and the like having a slider which is disassembled to prevent sticking.

[0002]

2. Description of the Related Art Conventionally, in order to reduce the adhesion between a magnetic disk and a slider, attempts have been made to reduce the surface energy of the surface of the slider facing the magnetic disk.

For example, a carbon film having a fluorinated layer is provided on the surface of a rail surface of a slider to lower the surface energy of the rail surface so as to have water repellency and oil repellency, thereby causing adhesion of foreign matter and occurrence of head crash. Is described in JP-A-63-251981.

Further, the surface roughness of the slider is set to Rmax = 0.0.
If the surface roughness Rmax of the magnetic disk is set to about 5 to 0.1 micrometer and Rmax is set to 0.2 micrometer, it is effective to prevent the slider from sticking and sticking to the magnetic disk. No., published in Japanese Patent Application Publication No.

[0005]

As described in Japanese Patent Application Laid-Open No. 63-251981, which is the prior art, reducing the surface energy of the rail surface is good for preventing the occurrence of head crash. In addition, lubricant and grease adhere to parts other than the rail surface, and the adhesion is not reduced.

Further, if the slider is formed with irregularities as described in JP-A-63-251981, the difference in the height of the irregularities decreases the flying height, resulting in a spacing loss. In order to prevent adhesion due to unevenness, a surface roughness of 10 to 20 micrometers is required, and a spacing loss cannot be ignored.

[0007] The present invention solves the above-mentioned problems, and even if the lubricant and the grease scattered from the spindle bearing and the pivot bearing provided on the magnetic disk adhere to the slider, they are decomposed by the photocatalytic function, and the slider and the magnetic disk are separated. It is an object of the present invention to provide a magnetic disk device in which the recording density is increased by preventing the sticking of the slider and reducing the flying height of the slider, and an external storage device using the same.

[0008]

SUMMARY OF THE INVENTION The present invention provides a magnetic disk having a lubricant layer formed on a surface thereof, a magnetic head for recording / reproducing data on / from the magnetic disk, and a magnetic head mounted with the magnetic head. In a magnetic disk drive having a slider facing a disk, a material containing at least anatase-type titanium dioxide is provided on a surface of the slider facing the magnetic disk and a side surface of the slider connected to a surface facing the magnetic disk. Provided with a slider.

When the titanium dioxide provided on the slider is irradiated with light containing ultraviolet rays by means of irradiating light containing ultraviolet rays by the photocatalytic function of titanium dioxide, the lubricant or grease attached to the slider is decomposed by the photocatalytic function. You. As a result, adhesion between the slider and the magnetic disk is prevented.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A magnetic disk device used for a storage device of a computer or for recording information is used for recording and reading information.
A slider on which a magnetic head for performing reproduction is mounted faces the magnetic disk. The slider flies while holding a fine gap (floating amount) of several tens to several hundreds of nanometers with respect to the magnetic disk as the magnetic disk rotates.

In order to increase the storage capacity of the magnetic disk drive, it is necessary to increase the density of magnets and racks formed on the magnetic disk, reduce the flying height of the slider, and reduce spacing loss.

In order to reduce the flying height of the slider,
It is necessary to prevent a phenomenon in which the slider comes into contact with the magnetic disk to damage the magnetic head or the magnetic disk, or the information is not properly recorded / reproduced. Therefore, a protective film is formed on the slider, and a lubricant is provided on the magnetic disk. However, when the magnetic disk drive is stopped, the slider comes into contact with the magnetic disk, and lubricant or grease adhering to the magnetic disk facing surface and the rear end surface of the slider during operation causes a gap between the slider and the magnetic disk. There is a possibility that the slider will stick to the magnetic disk.

When sticking occurs between the slider and the magnetic disk, when the magnetic disk device is operated again, the rotational torque at the start of rotation of the magnetic disk increases.

A magnetic head mounted on a magnetic disk device is mounted on a slider, and writes data to a magnetic disk and reads data from a magnetic disk. The slider flies due to the rotation of the magnetic disk, and moves between magnetic recording tracks to a target data recording area while maintaining a very small constant distance from the magnetic disk.

[0015] The need for recording capacity of magnetic recording devices these days is increasing year by year. Therefore, the recording density of the magnetic disk tends to be high, and the magnetic track interval tends to be narrow. At this time, it is necessary to reduce the distance (flying height) between the magnetic head and the magnetic recording surface of the magnetic disk due to the relationship of the magnetic flux density. At present, the flying height is about 50 nanometers. However, in the future, the recording density is further demanded, so that the flying height needs to be further reduced. As the flying height decreases, the frequency with which the slider contacts the magnetic disk also increases. Actually, a lubricant is provided on the surface of the magnetic disk in order to reduce damage to the magnetic head or the magnetic disk due to contact. Therefore, as the flying height of the slider decreases, the lubricant on the magnetic disk more easily adheres to the slider.

On the other hand, when the magnetic disk drive is not operating, the slider is in contact with the magnetic disk on a specific circumference of the magnetic disk. At this time, if a lubricant or grease adheres to the slider, an adhesion phenomenon occurs between the slider and the magnetic disk. If the magnetic disk device is stopped for a long time, the state of adhesion will further increase,
Even if the user tries to operate the magnetic disk device again, the magnetic disk cannot be driven smoothly because of the sticking of the slider, which causes a problem. For this reason, the tackiness must be prevented or reduced as much as possible.

An embodiment of a magnetic disk drive according to the present invention will be described in detail with reference to FIGS. FIG. 1 is a perspective view showing a state where a cover of a magnetic disk drive according to one embodiment is removed, FIG. 2 is an enlarged perspective view showing a slider according to the embodiment, and FIG. 3 is a slider according to another embodiment. FIG. FIG. 4 is an enlarged perspective view showing a slider according to a comparative example of the present invention.

As shown in FIG. 1, a magnetic disk 1 is stacked on a spindle 2 and fixed. A slider 3 on which a magnetic head is mounted is disposed facing the magnetic recording surface of each magnetic disk 1. The slider 3 is supported by a carriage 5 via a suspension 4. The spindle 2 and the carriage 5 are installed on a base 6.

The upper surface of FIG. 2 is the surface facing the magnetic disk. A rail 7 is provided on the surface of the slider 3 facing the magnetic disk.
Are formed, and portions other than the rails 7 are bleeds 8. A magnetic head 9 is mounted on the end face of the slider 3. The substance containing anatase type titanium dioxide is provided on the rail 7, the bleed 8 of the slider 3, and the side surface 10 of the slider 3. However, the shapes of the slider 3 and the rail 7 are not limited to the shapes shown in FIG. 2, but may be determined according to the performance of the magnetic disk device, the flying characteristics of the slider, and the like. Even if lubricant or grease adheres to the slider 3,
When ultraviolet light emitted from a light source installed in the magnetic disk device hits the titanium dioxide, the surface of the titanium dioxide becomes strongly oxidative by a photocatalytic reaction, and the lubricant and grease are oxidized and decomposed to carbon dioxide. Therefore, since no lubricant or grease remains on the slider 3, sticking can be prevented.

FIG. 3 shows that a material containing anatase type titanium dioxide is provided on the bleed 13 and the side surface 15 of the slider.

FIG. 4 is a perspective view of the slider 16 after operating the magnetic disk drive incorporating the slider to which the present invention is not applied.
Lubricant and grease adhered to 0 (a), 20 (b), 21 (a) and 21 (b).

A method of forming a substance containing anatase-type titanium dioxide on a slider includes a method of forming a film on the slider surface by a sol-gel method, a method of fixing titanium dioxide fine particles to a slider via a binder, and a method of forming titanium dioxide. Is attached to the slider.

The anatase type titanium dioxide has a maximum oil decomposition capacity of 0.05 mg / cm ² / hour. After the operation of the magnetic disk device, when a lubricant or grease having a thickness of a step difference between the rail and the bleed is applied to the entire surface of the slider facing the magnetic disk, the amount of adhesion is 0.004 mg. In this case, 4.
Irradiation with ultraviolet light for 8 minutes will decompose the lubricant and grease.

After a 2000-hour operation test of the magnetic disk drive of the present invention, it was confirmed that no lubricant or grease adhered to the slider and no sticking occurred.

[0025]

According to the present invention, even when the lubricant or the grease applied to the pivot bearing or the spindle bearing provided on the magnetic disk adheres to the slider,
A magnetic disk device which has been decomposed and removed by the photocatalytic action of titanium dioxide provided on a slider to prevent adhesion between the slider and the magnetic disk, and has reduced the flying height of the slider to increase the recording density, and to use the same. The external storage device can be obtained.

[Brief description of the drawings]

FIG. 1 is an exemplary perspective view showing a state where a cover of a magnetic disk drive according to an embodiment is removed;

FIG. 2 is an enlarged perspective view showing a slider according to the embodiment;

FIG. 3 is an enlarged view showing a slider according to another embodiment.

FIG. 4 is an enlarged perspective view showing a slider according to a comparative example of the present invention.

[Description of Signs] 1 ... magnetic disk, 3 ... slider, 7, 12, 17 ... rail, 8, 13, 18 ... bleed.

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Yukiko Ikeda 502 Kandate-cho, Tsuchiura-shi, Ibaraki Pref.

Claims (1)

[Claims] A magnetic disk having a lubricant formed on a surface thereof; a magnetic head for recording / reproducing data on / from the magnetic disk; and a slider having the magnetic head and facing the magnetic disk. In the disk device, a slider provided with a substance containing at least anatase-type titanium dioxide on a side of the slider connected to a surface of the slider facing the magnetic disk and a surface of the slider facing the magnetic disk, and light containing ultraviolet light. A magnetic disk drive comprising: a light source that emits light.