JPS6079575A - Magnetic disc device - Google Patents

Abstract

PURPOSE:To remove efficiently dust in a disc enclosure (DE) by moving forward a fixed disc up to a surface facing a base of a spindle housing. CONSTITUTION:A fixed disc 3 is projected to a surface Y facing a base 2 of a spindle housing 10, and a part of the facing surface Y is at least covered from the base 2. There is a gap X between the facing surface Y and the fixed disc 3. When a medium 5 is rotated to make the pressure in the housing 10 negative and an air circulating path is formed, an air film is generated in the gap X and air is discharged from a discharge hole 11 through a filter 8 without leaking from the gap X because the gap X has a minute width. Consequently, air leak does not occur even though the fixed disc 3 is not joined to the facing surface Y.

Description

DETAILED DESCRIPTION OF THE INVENTION (A) Technical Field of the Invention The present invention relates to a head crash prevention mechanism for a magnetic disk device, and more particularly to a magnetic disk device that can speed up the removal of dust within a magnetic disk housing and prevent head crashes. It is something.

(B) Background of the Technology A magnetic disk drive includes a magnetic disk medium in a sealed housing, a drive mechanism therefor, a magnetic head that reads and writes information to the medium, and a magnetic head drive mechanism that positions the magnetic head on the medium. The mainstream type is η, which is equipped with a disk enclosure (hereinafter referred to as DB) that has an integrated structure. Ideally, only still air should exist in the DE, but small amounts of dust may enter during the assembly process, or dust may be generated due to head cracks or the like. This dust must be removed because it causes a head crash.

(C) Prior Art and Problems Conventionally, a so-called central suction method has been adopted to remove dust within the DE. This central suction method takes advantage of the fact that when the medium rotates at high speed, the center has a negative pressure compared to other parts, and creates an air circulation path that allows air to flow into the center. . FIG. 1 shows the structure inside a conventional DE, where 1 is a cover of the DE.

2 is the base of the DB, 3.3' is the fixed disk, 4 is the spindle, 5 is the medium, 6 is where the magnetic head is installed, 2
7 is a magnetic head drive mechanism that positions the magnetic head on the medium by driving the head arm;
8 is a filter, 9 is a cuff ring, and 10 is a housing of the spindle. The housing 10 is integrally constructed with the spindle, the medium 5 is attached to the housing 10, and the medium 5 also rotates as the spindle 4 rotates. A housing 10 of the spindle 4 has a gap between it and the base 2. As the medium rotates 50 times, the central portion, that is, the gap inside the housing 10 becomes negative pressure. This is because air flows from the inner part to the outer part due to the centrifugal force caused by the rotation of the medium 5. Here 3,3'
are fixed disks, which are respectively attached to the carper 1 and base 2 of the DE housing so as to be parallel to the medium 5. This fixed disk 3.3' is provided in order to equalize the air friction of each medium. In other words, the media at the top and bottom of the diagram come into contact with air more than the media inside,
This is to keep the amount of air that each medium comes into contact with constant, so that the friction does not cause a temperature difference with the internal medium. Therefore, the air that has flowed toward the outer side of the medium 5 flows into the gap inside the housing 10 because it has a negative pressure. Then, the filter 8 removes dust from the air that has flowed in, and the air is discharged to the outside of the housing 10 again. In this case, the air flowing toward the outer side due to centrifugal force flows into the housing 10 through the lower part of the fixed disk 3. Refer to FIG. 2 to explain this situation in more detail. Figure 2 shows the housing 1 from the bottom of the fixed disc 3.
This is an enlarged view of the partial bone where air flows into the interior.

The housing 10 is provided with an exhaust hole 11 (not shown in the shaded area). Then, the medium 5 is fixed by forming an f1 layer while maintaining a predetermined spacing between each medium by means of a canfling ring 9. This cannula ring 9 is provided with an exhaust hole 9', which communicates with the inside of the housing 10.

The air flowing from the bottom of the fixed disk 3 is
0 into the housing 10 through the filter 8.
It passes through the exhaust hole 11 of the force ring 9 and is discharged. The filter 8 is pasted inside the housing 10 against the exhaust hole 11. Although the air circulation path is formed as described above, in this case, since there is a gap between the hanging 10 and the fixed disk 3, air leaks as shown by arrow A. Therefore, there is a drawback that the efficiency of removing dust by the filter 8 is reduced.

(D) Object of the Invention In view of the above-mentioned conventional drawbacks, the present invention improves the fixed disk so that air does not leak from the air circulation path in I)E, and all the circulated air passes through the filter 8. It is an object of the present invention to provide a head crush prevention mechanism that can improve dust removal efficiency by allowing the head to pass through the head.

(E) Structure of the Invention The object of the invention is to provide a cylindrical housing in which a plurality of magnetic disk media are stacked and fixed at predetermined intervals, and a cylindrical housing provided in the housing to allow air to flow between the magnetic disk media from the inner surface of the cylindrical housing jig. I provide a magnetic disk device characterized by comprising an exhaust hole for discharging the media and a fixed disk located at the outermost side of the stacked magnetic disk media so that at least the inner circumferential side overlaps the housing. This is achieved by providing

(F) Examples of the invention An embodiment of the present invention will be described in detail below with reference to the drawings.

FIG. 3 is a diagram for explaining one embodiment of the present invention.

Its structure is almost the same as that in FIG. 2, and the same parts are indicated by the same numbers. What differs from FIG. 2 is the configuration of the fixed disk 3.

The fixed disk 3 has a surface Y where the housing 10 faces the base 2.
The base 2 protrudes to cover at least a portion of the facing surface Y. The opposing surface Y and the fixed disk 3 have a distance X between them. This is because while the housing IO rotates, the stationary disk 3 is fixed to the base, and therefore the stationary disk 3 cannot be joined to the facing surface Y of the housing IO. However, the interval X is a minute distance (approximately 0.1 to 0.4
II11 is appropriate) Then, as mentioned above, when the medium 5 rotates and the inside of the housing 10 becomes negative pressure, and an air circulation path is formed, an air film is generated in the interval X, and the air is It is discharged from the exhaust hole 11 via the filter 8 without leaking from the exhaust hole 11. Therefore, even if the fixed disk 3 is not joined to the opposing surface Y, air leakage will not occur.

(G) Effects of the Invention As explained in detail above, according to the present invention, by advancing the fixed disk to the surface facing the base of the spindle housing, an air circulation path without air leakage is formed, and the circulating air is Since all of the dust passes through the filter, the dust in the DB can be efficiently collected using the filter.

[Brief explanation of drawings]

FIG. 1 is a sectional view of a conventional disk enclosure. FIGS. 2 and 3 are enlarged views of the air circulation path in the lower part of the spindle housing in the disk enclosure. In the figure, 2 is a base, 3 is a fixed disk, 5 is a medium, and 8
1 is a filter, 10 is a spindle housing, and 11 is an exhaust hole. Figure 1 Figure 2 Figure 3

Claims (1)

[Claims] A cylindrical housing for stacking and fixing a plurality of magnetic disk media at predetermined intervals; an exhaust hole provided in the housing for exhausting air between the magnetic disk media from the inner surface of the cylindrical housing; and the stacked magnetic disk media. a fixed disk located at the outermost side of the housing so that at least an inner peripheral side thereof overlaps the housing.