JPS61198485A - Magnetic disc device - Google Patents

Abstract

PURPOSE:To maintain the inside of the closed casing highly clean at all time by providing a circular filter and plural guide plates that guides the air flow generated by the magnetic disc in rotation to the circular filter. CONSTITUTION:The guide plates 4 are disposed and fixed on the circular filter 3 in a manner that a magnetic disc 2 is located in between them and that the air flow (a) generated by the rotation of the magnetic disc 2 is guided to the filter 3. The air flow (a) hits against a side plane 4' of the guide plates 4 to become an air flow (b), and flows into the circular filter 3. Therefore, most part of the flow (a) generated by the rotating magnetic disc 2 passes through the filter 3, hence the dust-removal can be attained efficiently. The guide plates are so fixed on the circular filter 3 as located above and below the plural magnetic discs 2 being parallel to them. The removing effect is the better the closer the distance between the disc 2 and the guide plate 4 is made. Accordingly, the dust-removing capability of the circular filter can be sufficiently made use of, so that the inside of the casing is at all time maintained highly clean.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a magnetic disk device, and particularly relates to a magnetic disk device that uses an air flow generated by the rotation of a magnetic disk inside a sealed case.
The present invention relates to a magnetic disk device having a dust removal mechanism that maintains high cleanliness.

[Technical background of the invention and its problems]

To record and reproduce information on a magnetic disk at high density, a magnetic head is levitated above the surface of the magnetic disk.

It is necessary to maintain a submicron floating gap.

At this time, if there is dust around the magnetic head, it will enter the flying gap between the magnetic disk and the magnetic head and impede stable flying of the magnetic head, and in severe cases.

Caused a head crash and subsequent records.

Situations may also occur in which regeneration becomes impossible. Therefore, conventionally, the following devices have been used to remove dust.
This will be explained with reference to FIG.

In FIG. 7, the case 1 is of a closed type so that an air circulation system with the outside is unnecessary.

One or more magnetic disks 2 are attached to a hub (not shown) and rotate at a predetermined number of revolutions, usually 2400 to 3600 revolutions per 7 minutes. The magnetic head 5 is attached to a carriage 6 and can be moved to any position on the magnetic disk 2 by a carriage actuator 7. The circulation filter 3 is sandwiched between the upper and lower surfaces of the case 1 in close proximity to the outer periphery of the magnetic disk 2 .

In such a configuration, when the magnetic disk 2 rotates, the air on its surface rotates as the magnetic disk 2 rotates, creating an air flow as shown by arrow a. This air flow is filtered by a circulation filter 3.

A method is used to remove dust inside the case 1.

However, the air flow is mainly in the direction of the arrow, and the static pressure on the air inflow side of the circulation filter 3 is not high enough.

There was a risk that the flow rates of the air flows I and j passing through the circulation filter 3 would be insufficient. In addition, magnetic disk drives have recently become smaller and the radius of the disk plate has become smaller, which has slowed down the speed of airflow caused by the magnetic disk. For this reason, the amount of air passing through the circulation filter becomes smaller and smaller, and there is a risk that the dust removal performance will be significantly degraded.

[Purpose of the invention]

The present invention has been made in view of the above circumstances.

shape Even in magnetic disk drives with small I disk plates.

It is an object of the present invention to provide a magnetic disk device in which a sufficient amount of air passes through a circulation filter and the inside of a closed case can always be kept at a high level of cleanliness.

[Summary of the invention]

In order to achieve the above object, one aspect of the present invention is as follows.

A hub that rotates around a predetermined axis with a magnetic disk or multiple magnetic disks mounted inside a case with a sealed structure, a magnetic head that reads and writes information from any position on the magnetic disk, and a hub that is coupled to the magnetic head. a carriage that moves the magnetic head to a desired position on the magnetic disk; a circulation filter that is placed inside the case to remove dust from the dust-containing gas; and a circulation filter that controls the gas flow inside the case caused by the rotation of the magnetic disk. To provide a magnetic disk device equipped with one or more guide plates for guiding to a circulation filter.

[Embodiments of the invention]

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

Note that in FIG. 1, the same or corresponding parts as in FIG.

In FIG. 1, guide plates 4 are arranged and fixed to the circulation filter 3 so as to sandwich the magnetic disk 2 above and below, and to guide the air flow a generated by the rotation of the magnetic disk 2 to the circulation filter 3. .

Due to this configuration, the air flow a is directed to the guide plate 4.
The air collides with the side surface 4 of the filter, causing air to flow and flowing into the circulation filter 3. Therefore, most of the air flow a generated by the rotation of the magnetic disk 2 passes through the circulation filter 3, and dust can be removed efficiently.

FIG. 2 is a perspective view showing the arrangement of the magnetic disk 2, the rotor 3, and the guide plate 4. As shown in FIG. The guide plate 4 is
It is fixed to the circulation filter 3 in parallel with a plurality of magnetic disks 2 (two in this case) and sandwiched vertically. The closer the distance between the magnetic disk 2 and the guide plate 4, the greater the effect, but in reality, it is desirable to maintain a distance of about 0.5 degrees because the magnetic disk 2 has ridges and the like.・Figure 3 shows the circulation filter/3
and shows the structure of the guide plate 4. To install the guide plate 4,
It can be formed integrally with the circulation filter 3, or it can be attached using an appropriate method such as adhesive after the circulation filter 31C. At this time, the shape and length of the guide plate 4.

By changing the thickness, the flow rate of air flowing into the circulation filter 3 can be arbitrarily controlled. The shape of the guide plate 4 can be various, but the simplest one is that if the material of the guide plate 4 is sufficiently rigid and does not vibrate against the air flow, the side surface of the guide plate 4 can be The effect can be obtained even with a board with no depth of only 4.

[Other embodiments of the invention]

4 and 5 show another embodiment of the present invention. In Figure 1, parts that are the same as those in Figures 7 and 1, or parts that are similar to those in Figure 1, are given the same reference numerals.

Explanation will be omitted.

4 and 5 are diagrams showing that even if the circulation filter 3 is placed at an arbitrary position, dust can be removed sufficiently by attaching the guide plate 4. Although the circulation router 3 is placed at the corner of the case 1 in FIG. 1, it may be placed on the side of the case 1 instead of at the corner as shown in FIGS. 4 and 5. in this case.

Dust removal is more effective when the surface is curved at right angles or when the surface is curved like a circular arc. this is,
For walls that are curved at right angles, stagnation points are formed in the vicinity and the airflow velocity is zero or even lower.

Although the speed is very low, a smooth wall surface forms streamlines along its shape and the speed loss is small, so the amount of air flowing toward the magnetic disk 2 increases.

Therefore, the angle of case 1 shown in Figure 1 is Km3! Rather than arranging the filter 3, the effect of the guide plate 4 can be fully exhibited by arranging it on the side surface of the case 1 as shown in FIGS. 4 and 5.

〔Effect of the invention〕

According to the present invention, since the guide plate for guiding the air flow is installed in the circulation filter, the flow rate of air passing through the circulation filter can be made sufficient even if the disk plate is small and the flow velocity of the air flow is slow. By changing the mounting position and shape of the guide plate, the air flow rate can be controlled as desired, making it possible to fully utilize the dust removal ability of the circulation filter.

The inside of the case can always be kept at a high level of cleanliness.

[Brief explanation of the drawing]

FIG. 1 is a plan view of an embodiment of a magnetic disk drive according to the present invention, FIGS. 2 and 3 are perspective views of a dust removal mechanism according to the present invention, and FIGS. 4 and 5 are perspective views of a dust removal mechanism according to the present invention. 6 is a perspective view showing another embodiment of the dust removal mechanism, and FIG. 7 is a plan view showing a conventional magnetic disk device. 1...Case, 3...Circulation filter, 4...
・Guide plate. Agent Patent attorney Kensuke Norichika (and 1 other person) Figure 3 Figure 4 Figure 6 Figure 5 (a) Figure 7
figure

Claims (1)

[Claims] 1. A case having a sealed structure, a hub to which a magnetic disk is attached and rotates around a predetermined axis, a magnetic head for recording and reproducing information from any position on the magnetic disk; a carriage that is coupled to a magnetic head and moves the magnetic head to an arbitrary position on the magnetic disk;
a circulation filter disposed in the case to remove dust from the dust-containing gas in the case; and one or more plates guiding the flow of gas in the case caused by rotation of the magnetic disk to the circulation filter. A magnetic disk device comprising a guide plate. 2. The magnetic disk device according to claim 1, wherein the circulation filter is formed integrally with the guide plate.