JPH02252185A - Magnetic disk device - Google Patents

Abstract

PURPOSE:To enable high density recording without widely changing a conventional air circulating mechanism by providing a second air filter for circulation in the air route of a disk clamp, passing all air, which flows on the surface of a magnetic disk, through this filter and obtaining fresh air. CONSTITUTION:A doughnut-shaped second air filter 22 for circulation is fitted to a disk clamp 21 same as the conventional device. In the clamp 21, a bolt hole 23 is provided to fasten this clamp to a spindle hub 3 and an air hole 24 is provided to communicate an air route 10 with the central part of a disk spacer 4. Thus, even to the small quantity of an air current, which is invaded from an interval between the air route 10 in a cover 8 side and the rotating clamp 21, not pass through a first air filter 9 for circulation, dust included in the above mentioned air current can be removed since the second filter is provided in the air route of the spacer 4. Then, the fresh air to be cooperated with the filter 9 can be supplied to the central part of the spacer.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a magnetic disk device, and particularly to a magnetic disk device having an air circulation mechanism that enables high-density recording.

[Prior Art] FIG. 2 shows, for example, Mitsubishi Electric wave phase Vo1.58. No2
1984, page 34 r M 4870 Large Capacity Fixed Disk Device" Particularly, FIG. 5 shows the air circulation mechanism of the conventional magnetic disk device disclosed.

In the figure, each of the plurality of magnetic discs (1) has a disc spacer (
4) are arranged between each magnetic disc (1) and stacked, and the uppermost end has a disc clamp (5) having a ventilation hole penetrating between both sides.
It is mechanically fixed to the spindle hub (3) via. (6) is a base that mechanically supports the above-mentioned components and serves as a common base made of aluminum casting or the like. The magnetic disk (1) configured in this way
, spindle motor (2), spindle hub (3),
A base spindle assembly (7) is composed of a disc spacer (4), a disc clamp (5), and a base (6).

Further, reference numeral (8) is a cover that covers the base spindle assembly (7).
) side surface includes a first circulating air filter (9) and an air passage (10) including the first circulating air filter (9).
is being made.

In addition, in the magnetic disk drive, a magnetic head (not shown) and an actuator for supporting and driving this magnetic head are mounted on the base spindle assembly (7). Air filter (9), air passage (
10) In addition to the assembly including a breathing filter (not shown), the head disk assembly is collectively referred to as a head disk assembly.

Next, the operation of the above-mentioned conventional device will be explained.

When the magnetic disk (1) begins to rotate, the centrifugal force of the magnetic disk (1) increases the air pressure at the outer periphery and lowers the air pressure at the center. Therefore, an air flow (11) indicated by the illustrated arrow is generated, and the clean air that has passed through the first circulating air filter (9) passes through the air passage (10) and enters the ventilation hole of the disc clamp (5). The disk spacer (4) further passes between the spindle hub (3) and the inner diameter side of the disk spacer (4).
) from the radial ventilation holes between the magnetic disks (1) from the inner circumferential side to the outer circumferential side, and this air flow effectively cools the magnetic disks (1).

[Problems to be Solved by the Invention] Conventional magnetic disk drives employ the center blowing type head disk assembly configured as described above, so that the air passage (10) on the cover side and the rotating circle are connected to each other. It is necessary to provide a gap (12) between the plate clamp (5) and the plate clamp (5) to avoid contact between the two. ) does not pass through the first circulating air filter, so the influence of this unclean air cannot be ignored, and some kind of countermeasure is necessary. had.

This invention was made in order to solve the above-mentioned problems, and provides a magnetic disk device having an air circulation mechanism that makes it possible to secure the clean airflow required for even higher density recording in the future. The purpose is to

[Means for Solving the Problems] A magnetic disk drive according to the present invention includes a first circulating air filter and a second circulating air filter in the air path of the disk clamp.

1 Effect] Since the magnetic disk device according to the present invention is configured as shown in J-, a small amount of first circulating air enters from the gap between the cover side air passage and the rotating disk clamp. Even if the airflow does not pass through a filter, the second circulating air filter is provided in the air passage of the disc clamp at the entrance of the airflow to the center of the disc spacer, so the airflow will not be affected by the airflow. The contained dust can also be filtered by the second circulating air filter, which cooperates with the first circulating air filter to supply clean air to the center of the disc spacer.

Embodiment J Hereinafter, this invention will be explained based on the drawings showing one embodiment thereof.

The overall configuration is the same as that shown in FIG. 2, which shows the conventional device, and the explanation will be limited to the differences between the present invention and the conventional device.

Fig. 1 is an enlarged view of the disc clamp (21) according to the invention, Fig. 1A is a plan view seen from the air passage (10) side of Fig. It is a sectional view taken along the IB-IB-IB line of A.

In the figure, reference numeral (21) is substantially the same as the conventional device, and a disk clamp (22) is a donut-shaped second circulating air filter.

(23) connects the disc clamp (21) to the spindle hub (3).
) is a bolt hole for mechanical attachment and fixing with a bolt (not shown), and (24) is a ventilation hole that communicates the air passage (10) with the center of the disc spacer (4). In the example, a second circulating air filter (22) is attached to one side of the disc clamp (21). By adopting such a structure, the air flow flowing into the center of the disc spacer (4), that is, between the spindle hub (3) and the inner peripheral side of the disc spacer (4), The airflow flowing through the gap (12) together with the airflow in the air passage (10) also flows through the second circulating air filter (
22), therefore, the disk spacer (
The air flow flowing from the ventilation hole in 4) onto the magnetic disk (1) is:
It becomes possible to have clean air from which all dust has been removed.

Further, in the above embodiment, the disc clamp (21) is provided with a ventilation hole (24), and the second ventilation hole (24) is closed.
Circulating air filter (22) with disk clamp (21)
The ventilation hole (24) was provided on either side of the
) may be abolished and the disk clamp (21) itself may be made of porous sintered metal to serve as the second circulating air filter.

A normal disk clamp (5) is an aluminum molded product and has no air permeability, but if it is made of sintered metal, a porous material is obtained, and the magnetic disk (1) In addition to having sufficient rigidity and processing accuracy as a clamp material, a disk clamp having an air filter function can be obtained.

In this case, since a disk clamp including an air filter function is obtained, there is no need to add the second circulating air filter (22) in the above embodiment.

Note that the air filter specifications may be determined by taking into account the target clean environment and cooling performance (-air volume), and comprehensively taking into account the role of the first circulating air filter (9).

Further, in the above embodiment, the second circulating air filter (22) was provided on either surface of the disc clamp (2''), but in particular, the second circulating air filter (22) was provided on either surface of the disk clamp (2'').
) of the disc clamp (21) without providing a vent hole (
24) may be constructed by embedding a second circulating air filter therein, and in this case as well, the same effects as in the above embodiment can be achieved.

[Effects of the Invention] As described above, according to the present invention, since the second circulation air filter is provided in the air path of the disk clamp, all the air flowing to the surface of the magnetic disk goes through the second circulation. Therefore, without making any major changes to the conventional air circulation mechanism, all the air flowing on the magnetic disk surface can be made into (R original airflow), and as a result, the current This has the effect of providing a magnetic disk device that enables high-density recording.

[Brief explanation of drawings]

FIG. 1A is a cross-sectional view of an embodiment of the present invention taken along a second circulation line, and FIG. 2 is a cross-sectional view of an embodiment of the present invention and a conventional device. (1)...Magnetic disc, (3)...Spindle hub, (4
)...Disc spacer, (7)...Base spindle assembly, (8)...Ka<-(9)...First circulation air filter, (10)...Air passage, (21)...・
Disc clamp, (22)...second circulation air filter, (24)...ventilation hole. In each figure, the same reference numerals indicate the same or corresponding parts. Display of procedural amendment case Patent application No. 1-71820 Name of the invention Relationship to the magnetic disk device amendment case Patent applicant address 2-3, Jyoshi-chome, Maruno, Chiyoda-ku, Tokyo Name (601) Mitsubishi Denki Co., Ltd. Representative Moriya Shiki

Claims (1)

[Claims] A plurality of magnetic disks are stacked on a spindle hub through disk spacers having ventilation holes in the radial direction, and a disk clamp is provided on the top of the magnetic disks to fix them, and the spindle hub is rotated. A first flow of cleaning air into the center of the disc spacer through the disc clamp onto the base spindle assembly and the surface of the cover covering the base spindle assembly on the base spindle assembly side.
In a magnetic disk drive equipped with a center blowing type head disk assembly having an air passage including a circulating air filter, a second circulating air filter is provided in the air passage of the disc clamp installed at the top of the spindle hub. A magnetic disk device characterized by: