JPH05314751A - Magnetic disk device - Google Patents

Abstract

PURPOSE:To improve the reliability by minimizing the influence of installation environment on a device. CONSTITUTION:External filters 6a and 6b are fitted in outside air holes 5a and 5b formed in an external housing 1. An external slide cylinder 2 is provided between the inside of the external casing 1 and external filters 6a and 6b. In the device of the external slide cylinder 2, inside air holes 7a and 7b are provided on a position opposed to the outside air holes 5a and 5b, and internal filters 8a and 8b are fitted in the inside air holes 7a and 7b. In the external slide cylinder 2, an internal slide cylinder 3 is supported by elastic springs 4a and 4b and when the atmospheric pressure outside the external housing 1 rises, the internal slide cylinder 3 moves to the side of the inside air holes 7a and 7b, but when the atmospheric pressure outside the external housing 1 is reduced, the internal slide cylinder 3 moves to the side of the outside air holes 5a and 5b.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a magnetic disk device, and more particularly to a magnetic disk device used as an external storage device of a computer system.

[0002]

2. Description of the Related Art Magnetic disk devices are widely installed in computer equipment ranging from supercomputers, which excel in ultra-high-speed arithmetic processing and information processing, to personal computers used in general households. These groups of magnetic disk devices are said to have a hermetically sealed structure, but actually have an air breathing hole to match the temperature and humidity inside the magnetic disk device to the temperature and humidity environment outside the magnetic disk device. There is. This air breathing hole is equipped with a high-precision filtration filter, and dust that enters the magnetic disk drive causes a head crash that destroys the recorded data information when the medium and head come into contact with each other. It has a structure to prevent.

In such a conventional magnetic disk device,
Since a filter is provided in order to match the temperature and humidity inside the device with the temperature and humidity of the external environment or to replace the air inside the device, it is not completely sealed.
On the other hand, the usage environment of the conventional magnetic disk unit was an environment where the air conditioning conditions were completely established, but this usage environment has deteriorated year by year, and recently, it has become an environment with much dust such as general office floors. ing. In addition, exhaust gas generated in factories and automobiles is increasing, and corrosive gas is increasing in the atmosphere.

As described above, the probability that harmful outside air enters the magnetic disk device is increasing, and when the harmful external air enters the magnetic disk device, if the humidity of the device itself suddenly changes, Condensation phenomenon occurs inside. Due to this dew condensation phenomenon, the medium and the head are attracted to each other, and the dew condensation phenomenon causes a problem such as the inability to start the apparatus and the generation of scratches on the medium due to suction dents, or a factor that causes corrosion. Further, there is a problem that a chemical reaction occurs in the apparatus due to the invasion of the corrosive gas, which accelerates the corrosion deterioration of the apparatus parts.

In order to solve the above problems, some magnetic disk devices are provided with humidity controlling silica gel or a gas adsorbent for adjusting the humidity, but the operating environment of the magnetic disk device Depending on the conditions, it is difficult for these members to maintain their performance for a long period of time, and there is a problem that the magnetic disk device may still be damaged.

[0006]

SUMMARY OF THE INVENTION The present invention has been made in order to eliminate the above-mentioned problems of the conventional one, and it is possible to minimize the influence of the installation environment on the device and improve the reliability. The purpose is to provide a disk device.

[0007]

A magnetic disk device according to the present invention is provided so as to cut off between a filter for communicating the inside of the device itself with the external environment and a gap between the inside of the device itself and the filter. And adjusting means for adjusting the pressure to be the same as the atmospheric pressure of the external environment.

Another magnetic disk device according to the present invention is a case constructed so as to completely shut off the inside of the apparatus from the outside air of the external environment, and the atmospheric pressure in the case is the same as the atmospheric pressure of the external environment. And adjusting means for adjusting so that

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, the present invention will be described with reference to the drawings.

FIG. 1 is a block diagram showing an embodiment of the present invention. In the figure, external ventilation holes 5a and 5b are provided in the external housing 1 of the magnetic disk device, and external filtration filters 6a and 6b are attached to the external ventilation holes 5a and 5b.

Inside the external housing 1 and the external filtration filters 6a, 6
The slide cylinder outer cylinder 2 is provided between the slide cylinder outer cylinder b and the slide cylinder outer cylinder 2, and internal ventilation holes 7a and 7b are provided inside the slide cylinder outer cylinder 2 at positions facing the outer ventilation holes 5a and 5b. Internal filtration filters 8a and 8b are attached to the internal ventilation holes 7a and 7b.

Further, inside the slide cylinder outer cylinder 2, a slide cylinder inner cylinder 3 supported by elastic springs 4a and 4b is provided with external ventilation holes 5a and 5b and internal ventilation holes 7a and 7b.
It is provided so as to cut off the space between and. The inner cylinder 3 of the slide cylinder has sufficient movability so that it can move in response to a minute change in atmospheric pressure.

Therefore, the slide cylinder inner cylinder 3 is provided with internal ventilation holes 7a and 7b when the atmospheric pressure outside the outer casing 1 becomes high.
When the air pressure outside the outer casing 1 becomes low, it moves to the side of the external ventilation holes 5a, 5b. When the external atmospheric pressure under the magnetic disk device installation environment becomes equal to the internal pressure of the external housing 1 due to the movement of the slide cylinder inner cylinder 3, the slide cylinder inner cylinder 3 stands still at that position.

A magnetic disk medium 9 is supported by a spindle 10 inside the external housing 1, and reading / writing of recording data information from / to this magnetic disk medium 9 is performed by a magnetic head 11 mounted on a magnetic head arm 12.

With the magnetic disk device stopped, the slide cylinder inner cylinder 3 is stationary at a position where the external atmospheric pressure under the magnetic disk device installation environment is equal to the internal pressure of the external housing 1. When the external atmospheric pressure rises in this state, outside air flows into the air pool A through the external filtration filters 6a and 6b attached to the external ventilation holes 5a and 5b,
The slide cylinder inner cylinder 3 is pushed to the air reservoir B side so that the pressure difference between the inside and outside of the outer casing 1 disappears.

At this time, the air in the air reservoir B is pushed into the sealed outer casing 1 to increase the internal pressure of the outer casing 1. After this, when the atmospheric pressures inside and outside the outer casing 1 become equal, the slide cylinder inner cylinder 3 stops. Here, the elastic springs 4a and 4b prevent a force generated by a sudden pressure difference between the inside and outside of the outer casing 1 from acting on the slide cylinder inner cylinder 3 and damaging the air damper composed of the slide cylinder outer cylinder 2 and the slide cylinder inner cylinder 3. It is for

When the magnetic disk drive is driven, the internal pressure of the outer casing 1 rises due to the wind pressure generated by the high speed rotation of the magnetic disk medium 9 and the high speed seek of the magnetic head arm 12.
Due to this increase in internal pressure, the gas inside the outer casing 1 is transferred to the internal ventilation filters 7a and 7b.
The slide cylinder inner cylinder 3 is pushed toward the air reservoir A side so that the pressure difference between the inside and the outside of the outer casing 1 disappears through the air reservoirs a and 8b.

At this time, the air in the air reservoir A is pushed out of the outer casing 1 to lower the internal pressure of the outer casing 1. After this, when the atmospheric pressures inside and outside the outer casing 1 become equal, the slide cylinder inner cylinder 3 stops.

On the other hand, an inert gas such as nitrogen gas or xenon gas is enclosed in the outer casing 1, but this inert gas does not come into contact with the air outside the outer casing 1 by the above-mentioned operation. Therefore, external corrosive gas and contaminant particles do not enter the outer casing 1. Further, since the inert gas does not contain water as a content component, the dew condensation phenomenon does not occur in the external housing 1 due to the temperature and humidity changes of the external environment.

Here, as a method of sealing the inert gas in the outer casing 1, a method of assembling and sealing the magnetic disk device in the atmosphere of the inert gas or a suction of the inert gas in the outer casing 1 is performed. A port and a discharge port are provided, and after the suction of the inert gas from the suction port and the discharge of the internal gas from the discharge port, the suction port and the discharge port are closed to seal the outer casing 1 to be sealed. There are ways to do it.

Further, an activated carbon type gas adsorbent (not shown) is attached to the inside of the outer casing 1, and the temperature inside the outer casing 1 becomes high due to the heat generated when the magnetic disk device is driven and the surrounding heat. Even if an impurity gas is sometimes generated from the material forming the device, the impurity gas is absorbed by the activated carbon gas adsorbent. If this impurity gas adheres to the surface of the magnetic disk medium 9, it may cause damage to the surface of the magnetic disk medium 9 due to contact with the magnetic head 11. However, the impurity gas becomes magnetic when the activated carbon gas adsorbent is attached. It does not affect the disk medium 9 or the magnetic head 11.

FIG. 2 is a block diagram showing another embodiment of the present invention, and FIG. 3 is a diagram showing the operation of another embodiment of the present invention. In these figures, in the magnetic disk device according to another embodiment of the present invention, an elastic air damper 14 is provided instead of the air damper consisting of the slide cylinder outer cylinder 2 and the slide cylinder inner cylinder 3 of the present invention shown in FIG. The configuration is the same as that of the embodiment, and the same components are designated by the same reference numerals. The operation of the same constituent element is also the same as that of the embodiment of the present invention.

In the magnetic disk device according to another embodiment of the present invention, the outer casing 13 is completely sealed after the inert gas is filled therein, and the elastic air damper 14 is provided so that the air pressure inside and outside the outer casing 13 becomes equal. It is provided.

The elastic body air damper 14 is an elastic body support 14a.
Is connected to the inside of the outer casing 13 and is fixed to the outside of the outer casing 13. The elastic air damper 14 is made of a viscoelastic material, and is deformed as shown in FIGS. The pressure is adjusted to be equal.

That is, when the magnetic disk drive is driven, the internal pressure of the outer casing 13 is increased by the wind pressure generated by the high speed rotation of the magnetic disk medium 9 and the high speed seek of the magnetic head arm 12. Due to this increase in internal pressure, the gas in the outer casing 13 flows into the elastic air damper 14, and the central portion swells to form a drum shape [see FIG. 3 (a)]. The inflow of gas into the elastic air damper 14 is stopped when the internal pressure of the outer casing 13 becomes low and the atmospheric pressures inside and outside the outer casing 13 become equal.

When the external atmospheric pressure rises while the magnetic disk device is stopped, the elastic air damper 14
The gas inside is pushed into the sealed outer casing 13 to increase the internal pressure of the outer casing 13. At this time, the elastic air damper 14 has a drum-like shape with a concave central portion due to the outflow of the internal gas to the outer casing 13 [see FIG. 3 (b)]. The outflow of the internal gas from the elastic air damper 14 is caused by the external casing 1.
The internal pressure of 3 becomes high, and the pressure stops inside when the atmospheric pressure inside and outside the outer casing 13 becomes equal.

In this way, the air inside the outer casings 1 and 13 and the outside air of the external environment are completely cut off, and the outer casing is constituted by the air damper or the elastic body air damper 14 consisting of the slide cylinder outer cylinder 2 and the slide cylinder inner cylinder 3. Body 1,13
By adjusting the atmospheric pressures inside and outside the same, the influence of the installation environment on the magnetic disk device can be minimized, and the reliability can be improved.

Further, by enclosing an inert gas such as nitrogen gas or xenon gas in the outer casings 1 and 13,
It is possible to prevent the occurrence of the dew condensation phenomenon in the external housings 1 and 13 due to the change in temperature and humidity of the external environment.

Further, when the activated carbon type gas adsorbent is mounted in the outer casings 1 and 13, when the insides of the outer casings 1 and 13 become high in temperature due to heat generated when the magnetic disk device is driven or surrounding heat. Even if an impurity gas is generated from the material forming the device, the impurity gas can be absorbed by the activated carbon gas adsorbent, so that the magnetic disk medium 9 or the like can be prevented from being damaged by the impurity gas.

[0030]

As described above, according to the present invention, the inside of the device itself is completely shut off from the outside air of the external environment, and the atmospheric pressure inside the device itself is adjusted to be the same as the atmospheric pressure of the external environment. This has the effect of minimizing the effect of the installation environment on the device and improving reliability.

[Brief description of drawings]

FIG. 1 is a configuration diagram showing an embodiment of the present invention.

FIG. 2 is a configuration diagram showing another embodiment of the present invention.

FIG. 3 is a diagram showing an operation of the elastic air damper of FIG.

[Explanation of symbols]

 1, 13 External housing 2 Slide cylinder outer cylinder 3 Slide cylinder inner cylinder 4a, 4b Elastic springs 5a, 5b External ventilation holes 6a, 6b External filtration filter 7a, 7b Internal ventilation hole 8a, 8b Internal filtration filter 14 Elastic air damper

Claims (6)

[Claims] 1. A filter that communicates between the inside of the device itself and the external environment and a filter that cuts off between the inside of the device itself and the filter, and the air pressure inside the device itself is the same as the atmospheric pressure of the outside environment. A magnetic disk device comprising: an adjusting unit that adjusts the pressure. 2. The adjusting means comprises an air damper having a cylinder and a piston that moves in the cylinder and shuts off the inside of the device from the filter in the cylinder. Item 1. The magnetic disk device according to item 1. 3. A housing configured to completely shut off the inside of the apparatus from the outside air of the external environment, and an adjusting means for adjusting the atmospheric pressure in the housing to be the same as the atmospheric pressure of the external environment. A magnetic disk device comprising: 4. The air damper, wherein the adjusting means is provided outside the housing and has an air pressure adjusting space communicating with the inside of the housing, and is an air damper made of an elastic body that defines the air pressure adjusting space. Item 3. The magnetic disk device according to item 3. 5. The magnetic disk device according to claim 1, wherein an inert gas is sealed in the device itself. 6. The magnetic disk device according to claim 1, wherein an adsorption member for adsorbing the impure gas in the self device is provided in the self device.