JP2001076478A - Magnetic disk drive - Google Patents

Abstract

(57) [Summary] With the downsizing of a magnetic disk drive and the narrowing of a flying height of a head, a small amount of gas in the drive, which has not conventionally been a problem, becomes a problem. As a mechanism that causes the gas to slide, there is a risk that the gas adsorbed on the surface of the magnetic disk may have some influence, and it is necessary to remove the adsorbed gas. A gas adsorbent is attached to a magnetic head support mechanism on a side facing a magnetic disk. As a result, it is possible to remove the gas which has entered between the magnetic disks having poor air circulation and then adsorbs on the surface of the magnetic disk before entering between the magnetic head slider and the magnetic disk.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a head-disk interface of a magnetic disk drive, and more particularly, to a method of arranging a gas adsorbent for adsorbing gas in a magnetic disk drive, which is resistant to gas and contamination environments.
The present invention relates to a highly reliable magnetic disk drive.

[0002]

2. Description of the Related Art In a magnetic disk drive, a gap between a magnetic head slider and a magnetic disk is narrowed in order to realize a high recording density, and a spindle rotation is sped up to shorten an information transfer time. . Along with this, floating dust in the magnetic disk drive and abrasion powder from the components that make up the magnetic disk enter the space between the levitation force generating surface of the slider rail and the magnetic disk, causing a temporary failure in reading recorded information. In addition, dust and oily mist adhere to the surface of the slider rail, and the flying becomes unstable. As a result, the danger of a destructive sliding accident has been increased.

In recent years, as the gap between the magnetic head slider and the magnetic disk has been further narrowed, it has become a problem that a head crash may be caused by gas generated from components used inside the magnetic disk device. The packing and sealing materials used in the field have been changed from materials that generate a large amount of gas to materials that emit less gas.

[0004] Among the gases generated from the parts, siloxane gas, in particular, is transformed into hard silicon oxide by frictional heat caused by the contact between the magnetic head slider and the magnetic disk, and therefore has a very high potential to cause head crash. As described in Japanese Unexamined Patent Publication No. Hei 4-1322072, it has been studied to use a fluororubber, which generates a small amount of siloxane gas, as a packing instead of a silicone rubber packing which generates a large amount of siloxane gas.

However, siloxane gas is also generated from parts other than the packing, and various methods have been studied for arranging activated carbon for adsorbing siloxane gas inside the apparatus in order to remove the siloxane gas in the apparatus.

In particular, since siloxane gas between the magnetic head slider and the magnetic disk causes a large head crash, it is difficult to remove contaminants in the region between the magnetic disk and the magnetic disk which has poor air circulation. is important.

As a technique for removing gas from a magnetic disk and a region sandwiched between the magnetic disks, a comb-shaped spoiler having a hollow structure is disposed between the disks, and activated carbon as an adsorbent for siloxane gas is mounted in the hollow. JP-A-5-135562 or JP-A-9-115280 in which activated carbon is arranged on the side of a magnetic head support mechanism.

[0008]

In order to prevent a head crash due to a siloxane gas, it is necessary to remove the siloxane gas from between the magnetic head slider and the magnetic disk. And the siloxane gas once entering this space is difficult to remove. In a recent analysis, a small amount of siloxane gas was detected from the surface of the magnetic disk, and the siloxane adsorbed on the surface of the magnetic disk was
It is considered that this is a trigger for sliding.

The above-mentioned JP-A-5-135562 or JP-A-9-1152
In the technique of No. 80, it is difficult to remove the siloxane gas adsorbed on the magnetic disk surface because the activated carbon does not face the magnetic disk surface.

Therefore, the present invention has a structure capable of removing siloxane gas adsorbed on the surface of a magnetic disk or siloxane gas near the surface of a magnetic disk which is to be adsorbed on the surface of a magnetic disk. It is an object of the present invention to provide a highly reliable magnetic disk device which can clean the atmosphere and does not cause a trouble such as a head crash.

[0011]

In order to solve the above-mentioned problems, according to the present invention, activated carbon as a gas adsorbent is disposed on the magnetic disk supporting mechanism on the side facing the magnetic disk. As a result, the siloxane gas can be removed from the surface of the magnetic disk and the vicinity thereof, specifically, the region between the magnetic head slider and the magnetic disk.

[0012]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows a magnetic head support mechanism 10 provided with a gas adsorbent according to a first embodiment of the present invention on which a magnetic head slider 20 is mounted. The magnetic head support mechanism 10 includes a load beam 21 for pressing the magnetic head slider 20 against a magnetic disk surface, a flexure 22 for connecting the magnetic head slider 20 and the load beam 21, and the like, for supporting a magnetic head slider 20 on which a magnetic head is mounted. Has as a component.

As shown in FIG. 1, the gas adsorbing material 30 is attached to the same surface as the magnetic head slider 20 with an adhesive such as an adhesive tape, and is installed on the side facing the magnetic disk 2.

FIG. 2 shows details of the gas adsorbent 30. FIG. 2 shows an AA ′ cut surface in FIG. The gas adsorbent 30 is a sheet-shaped gas adsorbent 100 having a thickness of 100 microns, which is covered with a filter 101, and is attached on the load beam 21 and the flexure 22 with an adhesive 102. The filter 101 is for preventing the surface of the magnetic disk from being contaminated by dust from the gas adsorbent.

The effect of attaching the gas adsorbent 30 to the magnetic head support mechanism will be described with reference to FIGS. 3, 4, and 5. Here, activated carbon was used as a gas adsorbent to adsorb siloxane gas as a pollutant.

FIG. 3 shows the magnetic head slider 20 shown in FIG.
FIG. 1 is a top perspective perspective view of a magnetic disk drive 1 equipped with a magnetic head support mechanism 10 according to the present invention on which is mounted. The package covering the entire device of FIG. 3 is the housing. The magnetic disk drive 1 includes a magnetic disk 2 for recording a signal, a magnetic disk rotating mechanism 3 for rotating the magnetic disk, a magnetic head used for recording and reproducing signals, and a magnetic head supporting a magnetic head slider on which the magnetic head is mounted. Mechanism 10,
The magnetic head positioning mechanism 5 that moves the magnetic head to a predetermined position is included as a component.

FIG. 4 schematically shows the magnetic disk drive 1 in which the magnetic head support mechanism 10 of the present invention and the conventional magnetic head support mechanism 40 are assembled. Using this magnetic disk drive 1, one hour in a thermostat at 60 ° C.
After operating for 00 hours, the magnetic disk was decomposed, the surface of the mounted magnetic disk was analyzed, and the amount of siloxane adhering to the surface of the magnetic disk was measured.

FIG. 5 shows the result of disassembling the magnetic disk drive after 100 hours of operation and analyzing the surface of the mounted magnetic disk. In the figure, white bars indicate the results of GC-MS analysis of the magnetic disk surfaces 2a, 2d, and 2e on the side facing the magnetic head slider using the magnetic head support mechanism 10, and black bars indicate the conventional magnetic head support mechanism. 40
2 shows the analysis results of the magnetic disk surfaces 2b, 2c, and 2f on the opposing surface side of the magnetic head slider using. In this case, the three surfaces 2a, 2d, and 2e of the magnetic head slider using the magnetic head support mechanism 10
Each analysis result is normalized with the average value of the MS analysis results being set to 1. As can be seen, by using the magnetic head support mechanism 10 of the present invention, the amount of siloxane adsorbed on the surface of the magnetic disk can be suppressed to about one-fifth of the conventional one.

FIG. 6 shows a magnetic head support mechanism 11 provided with a gas adsorbent according to a second embodiment of the present invention on which a magnetic head slider 20 is mounted. In this embodiment, a 100-micron-thick adsorption film 31 coated with an adhesive on the back surface is attached as a gas adsorbent. In this second embodiment,
Filter 101 is not attached. In recent years, a gas adsorbent that does not disperse dust has been developed, and is an embodiment in which contamination of the magnetic disk surface by the gas adsorbent does not pose a problem. By making the gas adsorbent thin and lightweight, the influence on the positioning characteristics of the magnetic head can be minimized. The gas adsorbent is attached at a position closer to the slider mounting position than the load generating portion, and near the end of the load beam.

FIG. 7 shows a magnetic head support mechanism 12 provided with a gas adsorbent according to a third embodiment of the present invention on which a magnetic head slider 20 is mounted. In this embodiment, a gas adsorbing material 32 made of a material having a gas absorbing function and attached to the magnetic disk supporting surface side of the magnetic head supporting mechanism is a vibration damping material for suppressing the vibration of the magnetic head supporting mechanism 12. It also has a function as a (damper). Thus, the gas adsorbent can also improve the vibration characteristics of the magnetic head.
The position where the gas adsorbent was stuck was in the vicinity of the bent portion of the load beam, specifically, in a region from the bent portion for generating the load to a position approximately 4 mm closer to the slider side.

FIG. 8 shows a magnetic head support mechanism 13 provided with a gas adsorbent according to a fourth embodiment of the present invention on which a magnetic head slider 20 is mounted. In this embodiment, in order to extract a signal from the magnetic head slider 20, an FPC (Fle) attached to the magnetic disk facing surface side of the magnetic head support mechanism 13 is used.
xible Printed Circuit) 33 contains a material having a gas absorbing action. Therefore, by attaching the FPC 33, it is possible to not only extract a signal but also remove a gas adsorbed on the surface of the magnetic disk.

As described above, by providing the existing parts with the gas adsorption function, the number of parts is not increased and the influence on the positioning characteristics of the magnetic head is minimized as compared with the case of attaching new parts. Can be.

FIG. 9 shows a magnetic head support mechanism 14 provided with a gas adsorbent according to a fifth embodiment of the present invention on which a magnetic head slider 20 is mounted. In the present embodiment, the gas adsorption film 34
Are formed on both surfaces of the magnetic head supporting mechanism opposite to the magnetic disk facing surface by a thin film forming technique such as sputtering. By adding a gas adsorption function to the entire surface of the magnetic head support mechanism, the adsorption rate of contaminants can be further improved. Also, for the same reason as in the fourth embodiment, the number of components does not increase.

In the embodiments, siloxane gas and activated carbon are exemplified as a combination of a pollutant and an adsorbent. However, the present invention is sufficiently applicable to other combinations of a pollutant and an adsorbent.

The technical concept encompassed by the present invention is not limited to a magnetic disk and a magnetic head, but a head crash may occur due to a contaminant between a storage medium and an element for recording / reproducing a signal to / from the storage medium. It is applicable to all possible storage media.

[0027]

According to the present invention, a gas absorbing material such as activated carbon which has an absorbing effect on contaminants such as siloxane gas which causes a head crash is provided on the side of the magnetic head supporting mechanism facing the magnetic disk. By installing in
A gas adsorbent can be inserted between magnetic disks having poor air circulation efficiency, and the efficiency of adsorbing and removing gas adhering to the surface of the magnetic disk can be increased. As a result, contaminants such as siloxane gas entering between the magnetic head slider and the magnetic disk are reduced, so that the occurrence of head crash is suppressed and the reliability of the magnetic disk drive for sliding is improved.

[Brief description of the drawings]

FIG. 1 is a perspective view of a magnetic head supporting mechanism according to a first embodiment of the present invention.

FIG. 2 is a sectional view taken along the line AA ′ of FIG. 1;

FIG. 3 is a top perspective perspective view of a magnetic disk drive equipped with a magnetic head support mechanism according to the first embodiment of the present invention.

FIG. 4 is a schematic view showing a state where the magnetic head support mechanism is assembled.

FIG. 5 is a magnetic disk surface analysis result showing the effect of the present invention.

FIG. 6 is a perspective view of a magnetic head supporting mechanism according to a second embodiment of the present invention.

FIG. 7 is a perspective view of a magnetic head supporting mechanism according to a third embodiment of the present invention.

FIG. 8 is a perspective view of a magnetic head supporting mechanism according to a fourth embodiment of the present invention.

FIG. 9 is a perspective view of a magnetic head supporting mechanism according to a fifth embodiment of the present invention.

FIG. 10 is a perspective view of a conventional magnetic head support mechanism.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Magnetic disk drive 2 Magnetic disk 3 Magnetic disk rotation mechanism 4 Base 5 Magnetic head positioning mechanism 10 Magnetic head support mechanism of the first embodiment of the present invention equipped with a magnetic head slider 11 11th of the present invention equipped with a magnetic head slider Magnetic head support mechanism of the second embodiment 12 Magnetic head support mechanism of the third embodiment of the present invention equipped with a magnetic head slider 13 Magnetic head support mechanism of the fourth embodiment of the present invention equipped with a magnetic head slider 14 A magnetic head supporting mechanism according to a fifth embodiment of the present invention on which a magnetic head slider is mounted 20 Magnetic head slider 21 Load beam 22 Flecture 30 Gas adsorbent 31 Gas adsorbing film 32 Damper made of gas adsorbing material 33 Including gas adsorbing material FPC 34 Gas adsorption film 40 Conventional magnetic head mounted with magnetic head slider Pad support mechanism 100 activated carbon 101 filter 102 adhesive

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Kenji Tasaka 292, Yoshida-cho, Totsuka-ku, Yokohama-shi, Kanagawa Prefecture Inside the Hitachi, Ltd.Production Technology Laboratory (72) Inventor Naotoshi Akamatsu 292, Yoshida-cho, Totsuka-ku, Yokohama-shi, Kanagawa Within Hitachi, Ltd. Production Technology Research Laboratories (72) Inventor Kazufumi Higashi 2880 Kokuzu, Odawara City, Kanagawa Prefecture Inside Hitachi Storage Systems Division (72) Inventor Masaki Otsuka 2880 Kokuzu, Odawara City, Kanagawa Prefecture Hitachi, Ltd. 5D059 AA01 BA01 CA30 DA26 DA40 EA07

Claims (6)

[Claims] In a magnetic disk drive having a magnetic disk, a magnetic disk rotating mechanism, a magnetic head, a magnetic head support mechanism, and a magnetic head positioning mechanism in a housing, a contaminant is adsorbed on a surface of the magnetic head support mechanism facing the magnetic disk. A magnetic disk drive with additional means. 2. A magnetic disk drive having a magnetic disk, a magnetic disk rotating mechanism, a magnetic head, a magnetic head support mechanism, and a magnetic head positioning mechanism in a housing, wherein a gas adsorbing material is provided on a surface of the magnetic head support mechanism facing the magnetic disk. A magnetic disk device to which is added. 3. The magnetic disk drive according to claim 1, wherein said contaminant adsorbing means is a damper for suppressing vibration of said magnetic head support mechanism. 4. A magnetic disk drive according to claim 1, wherein said contaminant adsorbing means is an FPC for extracting a signal from a magnetic head. 5. A magnetic head supporting mechanism for supporting a magnetic head, comprising a magnetic head slider, a load beam, and a flexure, wherein a magnetic substance adsorbing means is added to a surface of the magnetic head supporting mechanism facing the magnetic disk. Head support mechanism. 6. A magnetic head supporting mechanism having a magnetic head slider, a load beam, and a flexure for supporting a magnetic head, wherein the magnetic head supporting mechanism has a surface facing a magnetic disk and a surface opposite to the surface facing the magnetic disk. A magnetic head support mechanism in which at least one of a plurality of components on the surface is a contaminant adsorbing means.