JPH05266648A - Air filter mechanism for magnetic disc unit - Google Patents

Abstract

(57) [Summary] [Object] The present invention relates to an air filter mechanism of a magnetic disk device which is widely used in an external storage device of various computers, and an object of the invention is to downsize the device and to include a moisture preventive agent for preventing dew condensation. And [Structure] Spindle of magnetic disk 1 and magnetic head 2-
A housing 13 in which a rotary actuator 2 for accessing 1 is installed and a mounting hole is made to penetrate through a bottom of a corner,
The unit body 14-1 provided with a breathing filter for external air in the center with a size that can be coupled with the mounting hole and three props 14-2 are erected in a triangular prism shape on the unit main body 14-1. 14-2
And a filter unit 14 in which a filter sheet 14-3 is wound around and a moistureproof agent is contained therein, and the filter sheet 14-3 of the filter unit 14 is inserted into a mounting hole of the housing 13 and fixed, and the magnetic disk The air flow associated with the rotation of 1 passes through the filter sheet 14-3.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an air filter mechanism for a magnetic disk device which is widely used as an external storage device for various computers.

Recently, as the capacity of magnetic disk devices has increased remarkably and the storage capacity per unit area of magnetic disks has been increasing, the flying height between the magnetic disk and the head is 0.15 μm or more. It is less than that.

Under such a circumstance, in order that dust between the magnetic disk and the head may enter to destroy the stored information or cause the read / write operation to fail, the wind generated by the rotation of the magnetic disk inside the magnetic disk device. Although a circulation type air filter utilizing the above flow is arranged, in order to arrange this circulation type air filter in the magnetic disk device, it is necessary to form a mounting portion inside the housing.

Further, in the magnetic disk device, the air humidity rises due to a sudden temperature drop and dew condensation occurs, and the dew condensation causes the head and the surface of the magnetic disk to be adsorbed, resulting in the destruction of the recording state or the defective starting of the motor. There is a need for an air filter mechanism for a magnetic disk drive that can solve these problems.

[0005]

2. Description of the Related Art Recently, there is a great need for thinning and reducing the diameter of a magnetic disk device. Therefore, the air filter mechanism has a spindle (not shown) for rotatably supporting the magnetic disk 1 and a magnetic disk 1 as shown in FIG. Magnetic head 2-1
Inside the housing 3 in which the rotary actuator 2 is sealed and arranged, for example,
The column 5 having a height reaching the ceiling plate is erected at a corner opposite to the arrangement of the rotary actuator 2 in a position close to the outer peripheral surface of the magnetic disk 1, and between the column 5 and the side wall of the housing 3. For example, a filter sheet having a high dust collection efficiency of 80% or more and a dust collection diameter of 0.1 μm is stretched.

When the rotation driving motor is activated to rotate the magnetic disk 1 in the direction of the solid line arrow, the air in the housing 3 is caused to flow in the direction of the broken line arrow along with the rotation, and along with this flow, the housing is moved. The dust in 3 flows along with the air in the direction of the arrow indicated by the broken line, and can be collected when passing through the air filter.

[0007]

The problem with the air filter mechanism of the conventional magnetic disk drive described above is that
As shown in FIG. 6, the structure is such that the filter sheet is only stretched over a part of the inside of the housing 3. Therefore, the support portion 5 reaching the ceiling plate and the one end side of the filter sheet are fixed to the inside of the housing 3. However, there is a problem that the processing is required.

Further, due to a sudden temperature drop and the like, the air humidity in the magnetic disk device becomes high and dew condensation occurs, and this dew condensation causes the magnetic head 2-1 to stick to the surface of the magnetic disk 1 and destroy the recording state. Alternatively, there is a possibility that a start-up failure may occur in the rotation driving motor. However, in the structure shown in FIG. 5, there is a problem that the moistureproofing agent must be placed in another place in order to be placed in the device.

In view of the above problems, it is an object of the present invention to provide an air filter mechanism for a magnetic disk device which can be downsized and can contain a moisture preventive agent for preventing dew condensation.

[0010]

According to the present invention, as shown in FIG. 1, a spindle for rotatably supporting a magnetic disk 1 and an actuator 2 for accessing a magnetic head 2-1 are internally provided.
The housing 13 has a mounting hole that penetrates the bottom of the corner on the opposite side of the actuator 2, and the unit body 14-1 has a size that can be coupled to the mounting hole of the housing 13.
The pillars 14-2 are erected in a triangular prism shape, and the three pillars 14-2 are
-2 and a filter unit 14 in which a filter sheet 14-3 with a small pressure loss is wound, and the filter unit 14
The filter sheet 14-3 is inserted into the mounting hole of the housing 13 and fixed, and the air flow accompanying the rotation of the magnetic disk 1 passes through the filter sheet 14-3.

[0011]

In the present invention, the filter sheet surrounded by a triangular prism is used.
By arranging a filter unit 14 having 14-3 upright in the vicinity of the magnetic disk 1, when the magnetic disk 1 is driven and rotated in the direction of the solid line arrow, the air around it generates a flow in the direction of the broken line arrow. The flow is the filter unit 14
The dust contained in the airflow is collected because it passes through the filter sheet 14-3 wound in the shape of a triangular prism, and the housing 13 is provided by storing the moisture-proof agent inside the filter sheet 14-3. Since the air that circulates inside the disk is absorbed, it is possible to reduce the size of the apparatus and prevent the recording destruction of the magnetic disk 1 due to dew condensation or the startup failure of the rotation driving motor.

[0012]

Embodiments of the present invention will be described in detail below with reference to FIGS. FIG. 1 is a partially cutaway plan view showing an air filter mechanism of a magnetic disk device according to a first embodiment of the present invention,
2 is a perspective view showing a filter unit of the first embodiment, FIG. 3 is a schematic side sectional view showing a mounted state of the filter unit of the first embodiment, and FIG. 4 shows a method of manufacturing an air filter unit of the first embodiment. FIG. 5 is a schematic view showing a plan view of the air filter unit mechanism of the second embodiment. In the figure, the same members as those in FIG. 6 are designated by the same symbols, but the other 13 are magnetic disk and rotary rear. A housing in which the quatulator is hermetically installed therein, and 14 is a filter unit for collecting dust in the housing.

As shown in FIG. 1, the housing 13 is formed in such a size that a spindle for rotatably supporting the magnetic disk 1 and a rotary actuator 2 for accessing the magnetic head 2-1 can be hermetically arranged as in the conventional case. It is a container having a stepped mounting hole 13a having a large diameter on the lower surface, that is, on the outer side, as shown in FIG. 3, at the bottom of the corner opposite to the arrangement of the rotary actuator 2.

As shown in FIG. 2, the filter unit 14 is provided in a unit main body 14-1 having a breathing hole 14-1a penetrating through a central portion formed into a stepped columnar base that can be connected to the mounting hole 13a of the housing 13. Three columns 14-2 having a length reaching the ceiling plate of the housing 13 are erected on the outer peripheral edge of the small-diameter side end face so that the standing position is a triangle or a pillar. (The unit main body 14-1 and the three columns 14-2 may be integrally molded from synthetic resin.) As shown in FIGS. 2 and 4, the three columns 14-2 have less pressure loss. Moreover, the dust collection efficiency is low, for example, a filter sheet 14-3 with a dust particle size of 0.1 μm and a dust collection efficiency of 50% or less is wound in the direction of arrow A, and one support post 14-2 is used.
As a winding start point and a winding end point of the filter sheet 14-3, the columns 14-2 and the filter sheet 14-3 are adhered to their connecting portions by thermal fusion by laser irradiation.

Further, a breathing filter 14-4 having a high dust collecting efficiency for preventing dust from entering the housing 13 through the mounting hole 13a from the outside is fixed to the large diameter side end face of the unit body 14-1. The upper opening 14-5 surrounded by the filter sheet 14-3 is configured to close the triangular upper plate 14-5 from the direction of arrow B.

The first embodiment of the air filter mechanism of the magnetic disk device using the above member is 1 / third of the triangular columnar volume surrounded by the filter sheet 14-3 as shown in FIG.
A filter unit 14 in which a moisture-proofing agent (not shown) of 2 or less is packed in a breathable bag and housed inside the triangular prism, and the opening of the upper portion of the triangular prism is closed by an upper plate 14-5 is shown in FIG. As shown in FIG. 5, the housing 13 is inserted through the mounting hole 13a.

Then, as shown in FIG.
The direction is adjusted so that the air flow in the direction of the broken line arrow due to the rotation of 2 passes through the filter sheet 14-3 wound in the triangular prism shape twice, and when the unit is relatively large, it is passed through an O ring (not shown). Fix with screws, otherwise use only adhesive to prevent dust from entering the housing 13
Is stuck to.

As a result, the air flow in the direction of the broken line arrow that accompanies the rotation of the magnetic disk 1 passes twice through the filter sheet 14-3 wound in the triangular prism shape, so that the dust contained in the air flow is filtered by the filter sheet 14-. The air inside the housing 13 is absorbed by the moisture preventive agent (not shown) housed in the filter unit 14 in addition to collecting dust at 3, so that the apparatus can be downsized and the recording of the magnetic disk 1 due to dew condensation or rotation It is possible to prevent a starting failure in the driving motor.

As a second embodiment, as shown in FIG.
The filter sheet 24-3 having a high collection efficiency, for example, a dust collection efficiency of 80% or more at 0.1 μm, is attached to a unit body 14-1 similar to the first embodiment in which the two columns 14-2 are erected. A mounting unit provided in the housing 13 with a filter unit 24 which is bent at 14-2 and is fixed to the other two columns 14-2 at both side edges by heat fusion.
The magnetic disk 1 is inserted into the filter 13a, and its position is adjusted so that the air flow in the direction of the broken line arrow due to the rotation of the magnetic disk 1 passes through the filter sheet 24-3, and is fixed by screwing or bonding.

The above description is based on the illustrated embodiments, but the present invention is not limited to the embodiments described above.
For example, three columns 14-2 are erected on the unit main body 14-1 and the filter sheet 14-3 is fusion-bonded in a triangular prism shape, but it may be any prismatic shape. When the base of the triangular prism is right-angled, it is more effective in reducing the inflow resistance of air inside the device.

[0021]

As is apparent from the above description, according to the present invention, there is an advantage that the device can be downsized and the troubles due to the dew condensation can be prevented with an extremely simple structure, and it is extremely economical and reliable. It is possible to provide an air filter mechanism for a magnetic disk device, which can be expected to have an improved effect.

[Brief description of drawings]

FIG. 1 is a partially cutaway plan view showing an air filter mechanism of a magnetic disk device according to a first embodiment of the present invention.

FIG. 2 is a perspective view showing a filter unit of the first embodiment.

FIG. 3 is a schematic side sectional view showing a mounted state of the filter unit according to the first embodiment.

FIG. 4 is a schematic diagram showing a method of manufacturing an air filter unit according to the first embodiment.

FIG. 5 is a plan view showing an air filter unit mechanism of a second embodiment.

FIG. 6 is a partially cutaway plan view showing an air filter mechanism of a conventional magnetic disk device.

[Explanation of symbols]

1 is a magnetic disk, 2 is a rotary actuator,
2-1 is a magnetic head, 13 is a housing,
13a is a mounting hole, 14 and 24 are filter units, 14
-1 is the unit body, 14-1a is a breathing hole,
14-2 is a column, 14-3, 24-3 is a filter sheet, 14-4 is a breathing filter,
14-5 is the upper plate,

Claims (3)

[Claims] 1. A housing (13) in which a spindle (1) for rotatably supporting a magnetic disk (1) and an actuator (2) for accessing a magnetic head (2-1) are installed and sealed inside.
Place the filter unit (14) in which the filter sheet (14-3) is wound into a triangular prism shape with the column (14-2) close to the side wall of the housing (13) and the outer peripheral surface of the magnetic disk (1). An air filter mechanism for a magnetic disk device, characterized in that it is provided upright. 2. A filter unit (14) which is provided with a breathing hole for external air, has a breathing filter on one end face, and has a triangular prism shape projected by a filter sheet (14-3) on the other end face side,
2. The air filter mechanism for a magnetic disk drive according to claim 1, wherein the air filter mechanism is inserted into a mounting hole formed in the housing (13) at a position where the filter unit (14) is erected from the outside and coupled. 3. The air filter mechanism for a magnetic disk drive according to claim 1, wherein a moistureproof agent is disposed inside the filter unit (14) surrounded by the filter sheet (14-3).