JPH0714377A - Magnetic disk device - Google Patents

Abstract

PURPOSE:To obtain a magnetic disk device having high reliability by connecting an opening to the outside of a breathing pipe of a closed vessel and an opening for the inside of that with a hollow pipe and the like, and suppressing quantity of steam flowing into the closed vessel. CONSTITUTION:A first opening is provided on the outside face of a cover 11, a second opening leading into a base 12 is provided inside the cover 11 at a position being apart from the first opening, a pipe section connecting the first opening and the second opening through the inside of the cover 11 is provided, and a breathing pipe 13 is formed. Thus, this device is constituted so that the outside and the inside of the vessel are made to communicate with each other through the pipe part arranged through inside of the cover 11. Thereby, since a length of the breathing pipe can be made to be a desired length, pressure loss of the breathing pipe is made to bea prescribed value and quantity of steam flowing into the closing vessel can be suppressed. Therefore, it can bee prevented that a magnetic disk and a magnetic head are stuck to each other by steam and they are damaged.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic disk device used as an external storage device of a computer system, and more particularly to a magnetic disk device having a magnetic disk and a magnetic head housed in a sealed container.

[0002]

2. Description of the Related Art FIG. 6 is a perspective view showing an example of a conventional magnetic disk device.

As shown in FIG. 6, a conventional magnetic disk device in which a magnetic disk and a magnetic head are housed in a hermetically sealed container has a magnetic disk 1 for storing information, a spindle motor 2 for rotating the magnetic disk 1, and a rotation. The magnetic head 3 for writing or reading information to or from the magnetic disk 1, the carriage 4 for carrying the magnetic head 3 to move it to a designated position on the magnetic disk 1, and the rotational movement of the carriage 4 are driven. The magnetic disk 1 and the magnetic head 3 are housed in a base 6, and a cover 7 is covered on the base 6 for sealing.

The magnetic disk drive thus constructed is
During operation, the temperature rises, the pressure inside the sealed container rises, and the external atmospheric pressure changes, which causes a pressure difference between the inside and outside of the sealed container. For this reason, the pressure difference is absorbed by providing the cover 7 with the breathing tube 8 and circulating the breathing tube 8 inside and outside the sealed container.

[0005]

In the conventional magnetic disk drive as described above, the outside air flows into the sealed container through the breathing tube, but the steam also flows into the sealed container and diffuses into the sealed container.

The amount of water vapor flowing into the sealed container is affected by the pressure loss in the breathing tube, which depends on the cross-sectional area and length of the breathing tube. Therefore, by changing the cross-sectional area and length of the breathing tube, the amount of water vapor flowing into the sealed container through the breathing tube can be adjusted.

However, the breathing tube of the conventional magnetic disk device as described above is simply covered (or base).
Since the hole is only linearly penetrated through the tube, its length is determined by the thickness of the cover (or base), and it is difficult to form a breathing tube having sufficient pressure loss. Therefore, when the humidity in the hermetically sealed container is affected by the humidity of the outside air and the magnetic disk and the magnetic head come into contact with each other, water vapor is adsorbed on the magnetic disk and the magnetic head may be damaged. Have

[0008]

A first magnetic disk device of the present invention is a magnetic disk device comprising a container formed of a base and a cover, and a magnetic disk and a magnetic head housed in the container, wherein the base is Alternatively, the first opening provided on the outer surface of the cover, the second opening provided on the inner surface of the base or cover at a position apart from the first opening, and the first opening through the inside of the base or cover. A breathing tube having an opening and a tube portion connecting the second opening.

A second magnetic disk device of the present invention is a magnetic disk device including a container formed of a base and a cover, and a magnetic disk and a magnetic head housed in the container, wherein the outer surface of the base or the cover has the above-mentioned structure. Provide a groove that extends along the surface of the base or cover,
A breathing tube is formed by opening the end portion of the groove into the inside of the container and leaving the tip end portion of the groove covered with a sealing material.

A third magnetic disk device of the present invention is a magnetic disk device including a container formed of a base and a cover, and a magnetic disk and a magnetic head housed in the container, the magnetic disk device being provided along an inner surface of the base or the cover. A pipe extended to the outside, one end of the pipe penetrating the base or the cover and opening to the outside, and the other end of the pipe opening to the inside of the container to form a breathing tube.

[0011]

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

FIG. 1 is a view showing a container according to a first embodiment of the present invention, (a) is a plan view, (b) is a sectional view taken along line YY.
(C) is a XX sectional view.

In the embodiment of FIG. 1, a first opening is provided on the outer surface of the cover 11, and a second opening communicating with the base 12 is provided on the inner surface of the cover 11 at a position apart from the first opening. The breathing tube 13 is formed by providing a tube portion that connects the first opening and the second opening through the inside.

As described above, since the inside and outside of the container are circulated through the tube portion passing through the inside of the cover 11, the length of the breathing tube can be set to a desired length. The amount of water vapor flowing into the sealed container can be suppressed by setting the pressure loss to a predetermined value.

2A and 2B are views showing a container according to a second embodiment of the present invention. FIG. 2A is a plan view, FIG. 2B is a sectional view taken along line YY.
(C) is a XX sectional view.

In this embodiment, the cover 21 is not processed at all, and the base 22 has a breathing tube 23 similar to that of the embodiment of FIG.
Is formed.

The operation and effect of this embodiment are the same as those of the embodiment of FIG.

FIG. 3 is a view showing a container of a third embodiment of the present invention, (a) is a plan view, (b) is a sectional view taken along the line YY.
(C) is a XX sectional view.

In this embodiment, a groove extending along the surface of the cover 31 is provided on the outer surface of the cover 31, the end of this groove is opened inside the base 32, and the tip of the groove is left to leave the remaining portion. The breathing tube 33 is formed by covering the portion with a sealing material 34.

The operation and effect of this embodiment are the same as those of the embodiment of FIG.

Similar to the embodiment shown in FIG. 2, the groove 32 is formed at the base 32 instead of the cover 31 with the same operation and effect.

FIG. 4 is a view showing a container according to a fourth embodiment of the present invention, (a) is a plan view, (b) is a sectional view taken along the line YY.
(C) is a XX sectional view.

In this embodiment, a pipe 44 extending along the inner surface of the cover 41 is provided, and one end of the pipe 44 is covered by the cover 4.
1 is opened to the outside and the other end of the pipe 44 is opened to the inside of the base 42 to form a breathing tube 43.

The operation and effect of this embodiment are the same as those of the embodiment of FIG.

FIG. 5 is a view showing a container of a fifth embodiment of the present invention, (a) is a plan view, (b) is a sectional view taken along the line YY,
(C) is a XX sectional view.

In this embodiment, the cover 51 is not processed at all, and the base 52 is provided with a pipe 54 as in the embodiment of FIG.
The breathing tube 53 is formed by.

The operation and effect of this embodiment are the same as those of the embodiment of FIG.

[0028]

As described above, in the magnetic disk drive of the present invention, the opening of the breathing tube provided in the hermetically sealed container with respect to the outside and the opening with respect to the inside thereof are separated from each other, and a space between them is provided. By connecting a hollow tube provided parallel to the surface of the cover, or a groove with a sealant, or a pipe, the length of the breathing tube can be set to a desired length, so that the pressure loss of the breathing tube can be set to a predetermined value. As a value of, there is an effect that it is possible to suppress the amount of water vapor flowing into the sealed container, and therefore, it is possible to prevent the magnetic disk and the magnetic head from being adsorbed by the water vapor and damaging the magnetic disk or the magnetic head, There is an effect that a highly reliable magnetic disk device can be obtained.

[Brief description of drawings]

FIG. 1 is a view showing a container according to a first embodiment of the present invention,
(A) is a plan view, (b) is a cross-sectional view taken along line YY, (c) is X.
It is a X-ray sectional view.

FIG. 2 is a view showing a container according to a second embodiment of the present invention,
(A) is a plan view, (b) is a cross-sectional view taken along line YY, (c) is X.
It is a X-ray sectional view.

FIG. 3 is a view showing a container according to a third embodiment of the present invention,
(A) is a plan view, (b) is a cross-sectional view taken along line YY, (c) is X.
It is a X-ray sectional view.

FIG. 4 is a view showing a container according to a fourth embodiment of the present invention,
(A) is a plan view, (b) is a cross-sectional view taken along line YY, (c) is X.
It is a X-ray sectional view.

FIG. 5 is a view showing a container according to a fifth embodiment of the present invention,
(A) is a plan view, (b) is a cross-sectional view taken along line YY, (c) is X.
It is a X-ray sectional view.

FIG. 6 is a perspective view showing an example of a conventional magnetic disk device.

[Explanation of symbols]

 1 Magnetic Disk 2 Spindle Motor 3 Magnetic Head 4 Carriage 5 Positioning Motor 6 Base 7 Cover 8 Breathing Tube 11, 21, 31, 41, 51 Cover 12, 22, 32, 42, 52 Base 13, 23, 33, 43. 53 Breathing pipe 34 Sealing material 44/54 Pipe

Claims (3)

[Claims] 1. A container formed of a base and a cover,
In a magnetic disk device including a magnetic disk and a magnetic head housed in the container, a first opening provided on an outer surface of the base or cover and a position separated from the first opening on an inner surface of the base or cover. A breathing tube having a second opening provided in the first opening and a tube section that connects the first opening and the second opening through the inside of the base or the cover. . 2. A container formed of a base and a cover,
In a magnetic disk device including a magnetic disk and a magnetic head housed in the container, a groove extending along the surface of the base or the cover is provided on an outer surface of the base or the cover, and an end portion of the groove is formed in the container. A magnetic disk device, wherein a breathing tube is formed by opening the inside of the groove and covering the remaining portion of the groove with a sealing material to leave the tip end portion of the groove. 3. A container formed of a base and a cover,
In a magnetic disk device including a magnetic disk and a magnetic head housed in the container, a pipe extending along an inner surface of the base or cover is provided, and one end of the pipe penetrates the base or cover and is opened to the outside. Then, the other end of the pipe is opened to the inside of the container to form a breathing tube.