JPH11242872A - Magnetic disk and gas removing method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a compact magnetic disk device in which the replacing of a gas adsorbent is easily performed. SOLUTION: This device is constituted in which an opening part 5 is provided an one part of the head disk cover 4 of a head disk assembly having a hermetically sealed structure and a gas adsorbing sheet 6 is stuck on a cover to cover the opening part 5. A gas adsorbent is stuck on the gas adsorbing sheet 6 at a part to be brought into contact with an atmosphere in the head cover 4 and the gas adsorbent can be replaced from the outside of the head disk cover 4.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic disk drive, and more particularly, to a head disk assembly (hereinafter referred to as an HD disk).
Called A. The present invention relates to a magnetic disk drive having a mechanism for removing generated gas (organic gas, inorganic gas) in the parentheses. Further, the present invention relates to a gas removing method for removing generated gas in the atmosphere in the HDA of such a magnetic disk device.

[0002]

2. Description of the Related Art In this type of magnetic disk drive, HDA
Has a sealed structure to prevent dust from adhering to the optical head.
Gas adsorbents are often used to remove gas that has entered from the outside. As this gas adsorbent, usually, a gas adsorbent that has been subjected to dustproofing treatment is used.

FIG. 4 is a schematic configuration diagram of an HDA of an optical disk device disclosed in Japanese Patent Application Laid-Open No. 8-306182. The HDA includes a magneto-optical disk 101 for recording information,
Cartridge 10 containing magneto-optical disk 101
2, a spindle motor 103 for rotating the magneto-optical disk 101, an optical head 104 for writing and reading information to and from the magneto-optical disk 101, a positioning mechanism 105 for the optical head 104, and a housing for these optical members. And an adsorption case 100 having a gas adsorbent 108 on the plate 106.
Is detachably mounted. A boundary surface 107 where the suction case 100 and the internal space S of the plate 106 are in contact is formed in an uneven shape, so that the corrosive gas in the plate 106 is adsorbed by the gas adsorbent 108.

[0004] In addition to the above, JP-A-8-102181 discloses H
A case containing a desiccant and a gas adsorbent for removing moisture and corrosive gas in the DA is provided, and a mechanism for stirring the desiccant and the gas adsorbent in the case is provided. There is also disclosed a device in which all particles of a desiccant and a gas adsorbent contained in a case work uniformly when removing corrosive gas.

[0005]

However, the above-mentioned conventional magnetic disk drive has the following problems.

[0006] In the disk device disclosed in Japanese Patent Application Laid-Open No. 8-306182, the suction case is attached to the outside of the HDA, so that the HDA becomes large and the size of the hard disk is reduced. Be disadvantaged. In addition, the suction case with the boundary surface formed in an irregular shape is HD
The configuration detachably attached to the A case from the outside is disadvantageous in terms of cost. In addition, in this disk device, since the gas in the environment is adsorbed by the gas adsorbent before the gas adsorbent is loaded into the adsorption case and attached to the HDA, the adsorption capacity of the gas adsorbent decreases. There is a problem of doing it.

The disk device disclosed in Japanese Patent Application Laid-Open No. 8-102181 has the following problems in addition to the problem of a decrease in the adsorption capacity of the gas adsorbent and the inability to replace the gas adsorbent. is there.

When the generated gas is adsorbed by the gas adsorbent, H
When the amount of generated gas in the DA increases, the desorption and adsorption of the generated gas to the gas adsorbent are repeated as the temperature rises and falls when the disk device is started and stopped, and the generated gas concentration in the atmosphere in the HDA is repeated. Reaches the equilibrium point concentration with the adsorption power of the gas adsorbent. If the gas adsorbent cannot be replaced and the generated gas concentration reaches the equilibrium point concentration, the generated gas concentration cannot be reduced below the equilibrium point concentration.

It is an object of the present invention to provide a compact magnetic disk drive in which the gas adsorbent can be easily replaced. Another object of the present invention is to provide a magnetic disk drive capable of reducing costs.

It is a further object of the present invention to provide a gas removing method capable of removing generated gas in the atmosphere in HDA with a high gas adsorption capacity.

[0011]

In order to achieve the above object, a magnetic disk drive according to the present invention is a magnetic disk drive having a head disk assembly having a closed structure, wherein a part of a housing of the head disk assembly can be opened and closed. , Wherein the gas adsorbing member, which is the stored material, is replaceable.

In the above case, the gas adsorbing member may be a case accommodating a gas adsorbent, and the accommodating portion may have a fixing means for detachably fixing the case.

The gas adsorbing member is constituted by a gas adsorbing sheet in which one surface of a sheet is an adhesive surface and a gas adsorbing agent is provided on the other surface, and the gas adsorbing sheet is attached to the accommodating portion. May be adopted.

Further, the housing portion may be a drawer portion configured to be able to pull out a part of the housing of the head disk assembly.

The accommodating portion may be a door-like opening / closing portion configured to open and close a part of a housing of the head disk assembly.

Further, the magnetic disk device of the present invention is a magnetic disk device having a head disk assembly having a closed structure, wherein the housing of the head disk assembly has an opening in a part thereof and covers the opening. The sheet-shaped gas adsorbing member is attached as described above, and the gas adsorbing member is configured to be replaceable.

In the above case, the gas adsorbing member is constituted by a gas adsorbing sheet in which one surface is an adhesive surface and a gas adsorbent is attached to a portion of the adhesive surface that comes into contact with the atmosphere in the housing. It may be configured to be replaceable from outside the housing.

The gas removing method according to the present invention is a gas removing method for removing generated gas in an atmosphere in a head disk assembly having a closed structure with a gas adsorbent. It is housed in an assembly to remove generated gas.

In the above case, the degassing process may be a process of desorbing a gas adsorbed on a gas adsorbent at a temperature higher than the operating temperature of the head disk assembly in a high-purity inert gas under reduced pressure.

(Operation) In the magnetic disk drive of the present invention, a part of the housing of the head disk assembly is configured to be openable and closable, and the gas adsorbent is arranged and stored therein. The case where the case containing the conventional gas adsorbent is attached from the outside of the HDA does not increase the size of the apparatus.

In the present invention using the gas adsorbing sheet, the gas adsorbent can be replaced simply by replacing the gas adsorbing sheet, so that the gas adsorbent can be easily replaced.

In the case where the gas adsorption sheet is attached to the accommodation section, the accommodation section only needs to be large enough to attach the gas adsorption sheet, so that the accommodation section can be made smaller and the HDA becomes more compact.

When the gas adsorbing sheet is attached so as to cover the opening of the housing of the head disk assembly, the housing is not required, so that the HDA becomes more compact.

In the gas removing method of the present invention, the gas adsorbent is degassed before being housed in the head disk assembly, so that the gas in the environment adsorbed by the gas adsorbent is removed by this degassing process. Separated. Therefore, the adsorption capacity of the gas adsorbent does not decrease as in the conventional case.

[0025]

Next, embodiments of the present invention will be described with reference to the drawings.

(First Embodiment) FIG. 1A shows a sectional structure of an HDA of a magnetic disk drive according to a first embodiment of the present invention.
And a top view thereof is shown in FIG.

The HDA performs recording / reproduction including a magnetic disk 1 for recording information, a spindle motor 2 for rotating the magnetic disk 1, an optical head 3 for writing and reading information to and from the magneto-optical disk 1, and the like. The part to be performed has a structure sealed by the head disk cover 4. An opening 5 is provided in a part of the head disk cover 4, and a gas adsorption sheet 6 is attached so as to cover the opening 5.

A gas adsorbent 7 is attached to a portion of the gas adsorbing sheet 6 which comes into contact with the atmosphere in the head disk cover 4 through the opening 5. The gas adsorbent 7 has been subjected to a degassing process in advance in order to increase the gas adsorption capacity. As the degassing process, various processes such as a process of desorbing the adsorbed gas by heating the gas adsorbent to a predetermined temperature and a process of desorbing the gas adsorbed on the gas adsorbent under reduced pressure can be considered. However, in order to obtain a gas adsorbent having a high gas adsorption capacity, it is desirable to desorb a gas adsorbed on the gas adsorbent at a temperature equal to or higher than the operating temperature of the magnetic disk device in a high-purity inert gas under reduced pressure. .

In the HDA configured as described above, the gas adsorbent 7 of the gas adsorbent sheet 6 attached to the opening 5
Thereby, the generated gas in the atmosphere in the head disk cover 4 is adsorbed, and the gas concentration in the head disk cover 4 is reduced. Since the gas adsorbent 7 has been degassed as described above, its adsorbing ability is higher than that of the conventional one, and the gas concentration in the head disk cover 4 is lower than in the conventional case.

When the amount of generated gas in the atmosphere in the head disk cover 4 of the HDA increases and the generated gas concentration reaches an equilibrium point concentration with the adsorbing power of the gas adsorbent 7, the generated gas concentration becomes the equilibrium point concentration. It will not be less than. In this embodiment, the gas adsorbing sheet 6 can be easily replaced with a new gas adsorbing sheet, whereby the generated gas concentration can be reduced to the equilibrium point concentration or lower.

(Second Embodiment) FIG. 2 shows a schematic configuration of an HDA of a magnetic disk drive according to a second embodiment of the present invention. In the figure, the same components as those shown in FIG. 1 are denoted by the same reference numerals.

The HDA includes a drawer 8 which is formed in a part of the head disk cover 4 so as to be able to be pulled out, and a gas adsorbing member 9 is accommodated in the drawer 8. This gas adsorbing member 9 is a gas adsorbing sheet in which one surface of the sheet is an adhesive surface and the other surface is provided with a gas adsorbent that has been degassed as in the first embodiment. Alternatively, a case containing such a gas adsorbent may be used. In the case of a gas adsorption sheet, the gas adsorbent can be mounted and replaced only by sticking it to the drawer section 8. In the case of a case, a mechanism for detachably fixing the case to the drawer section 8 is provided, so that the gas adsorbent can be replaced.

In the HDA configured as described above, when the drawer 8 is closed, the head disk cover 4 is closed. The generated gas in the atmosphere in the head disk cover 4 is adsorbed by the gas adsorbent of the gas adsorbing member 9 accommodated in the drawer 8, and the gas concentration in the head disk cover 4 is reduced. When the generated gas concentration reaches the equilibrium point concentration, the drawer 8 is opened and the gas adsorption member 9 is replaced. Thereby, similarly to the case of the above-described first embodiment, the generated gas concentration can be made equal to or less than the equilibrium point concentration.

The drawer 8 for accommodating the gas adsorbing member 9 is not limited to the structure shown in FIG.
For example, a door-shaped opening / closing unit configured so that a part of the head disk cover 4 can be opened / closed may be used.

Next, specific effects of the above-described degassing process will be described.

An inert gas (He) was supplied at a flow rate of 50 ml / min.
FIG. 3 shows the change in the concentration of the generated gas in the atmosphere in the head disk cover 4 when the gas adsorbent 7 is degassed while maintaining the temperature at 200 ° C. while flowing at a pressure of 3 kg / cm 2. In FIG. 3, the solid line (a) indicates the case where the degassing process is performed and no replacement is performed, the solid line (b) indicates the case where the degassing process is performed and the replacement is performed, and the broken line (c) indicates the state where the degassing process is not performed. Shown respectively.

As can be seen from FIG. 2, when the gas adsorbent is degassed, the gas concentration in the head disk cover 4 is greatly reduced as compared with the case where the degassing is not performed.
Further, even when the degassing process is performed, when the gas adsorbent is replaced, the effect of reducing the gas concentration in the head disk cover 4 is significantly improved.

[0038]

According to the present invention constructed as described above, the conventional case containing the gas adsorbent is H
Since it is not attached to the outside of DA, a compact H
DA can be provided.

When the gas adsorbing sheet is attached to the storage section, the gas adsorbing sheet is inexpensive as compared with an adsorbing case or the like, so that the cost of the apparatus can be reduced. Further, since the gas adsorbent can be exchanged by replacing the gas adsorption sheet, the gas adsorbent can be easily exchanged, and a compact magnetic disk drive capable of keeping the generated gas concentration below the equilibrium point concentration is provided. can do.

Further, according to the gas removing method of the present invention, since the gas adsorbed in the environment, which has caused a decrease in the gas adsorbing ability, is desorbed by the degassing treatment, the efficiency of adsorbing the generated gas by the gas adsorbent is improved. There is an effect that the gas concentration can be increased and the effect of reducing the gas concentration can be significantly improved.

[Brief description of the drawings]

FIG. 1 is a diagram showing a schematic configuration of an HDA of a magnetic disk device according to a first embodiment of the present invention, wherein FIG.
(B) is a top view.

FIG. 2 is a diagram for explaining a schematic configuration of an HDA of a magnetic disk device according to a second embodiment of the present invention.

FIG. 3 is a diagram showing a change in concentration when a degassing process is performed.

FIG. 4 is a schematic configuration diagram of an HDA of an optical disk device disclosed in Japanese Patent Application Laid-Open No. 8-306182.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Magnetic disk 2 Spindle motor 3 Optical head 4 Head disk cover 5 Opening 6 Gas adsorption sheet 7 Gas adsorbent 8 Lead-out part 9 Gas adsorption member

Claims (9)

[Claims] 1. A magnetic disk drive having a head disk assembly having a closed structure, comprising: a housing configured to be able to open and close a part of a housing of the head disk assembly, wherein the housing is an object of the housing. A magnetic disk drive, wherein the gas adsorption member is configured to be replaceable. 2. The magnetic disk drive according to claim 1, wherein the gas adsorbing member is a case accommodating a gas adsorbent, and the accommodating portion has fixing means for detachably fixing the case. Characteristic magnetic disk drive. 3. The magnetic disk drive according to claim 1, wherein the gas adsorbing member is formed of a gas adsorbing sheet having one surface of the sheet being an adhesive surface and the other surface being provided with a gas adsorbent, The magnetic disk device, wherein the gas adsorption sheet is attached to the storage section. 4. The magnetic disk drive according to claim 1, wherein the housing is a drawer configured to allow a part of a housing of the head disk assembly to be drawn out. A magnetic disk drive characterized by the above-mentioned. 5. The magnetic disk drive according to claim 1, wherein the housing portion has a door-like opening / closing mechanism configured to open and close a part of a housing of the head disk assembly. A magnetic disk drive characterized by being a unit. 6. A magnetic disk drive having a head disk assembly having a closed structure, wherein a housing of the head disk assembly has an opening in a part thereof, and a sheet-shaped gas adsorbing member covers the opening. Wherein the gas adsorbing member is replaceable. 7. The magnetic disk drive according to claim 6, wherein one side of the gas adsorbing member is an adhesive surface, and a gas adsorbent is attached to a portion of the adhesive surface that comes into contact with the atmosphere in the housing. A magnetic disk drive, comprising: a gas adsorbing sheet, which is replaceable from outside the housing. 8. A gas removing method for removing generated gas in an atmosphere in a head disk assembly having a closed structure with a gas adsorbent, wherein the gas adsorbent is degassed and then housed in the head disk assembly. A gas removing method comprising removing generated gas. 9. The gas removing method according to claim 8, wherein the degassing is performed by removing a gas adsorbed by a gas adsorbent at a temperature equal to or higher than a use temperature of the head disk assembly in a high-purity inert gas under reduced pressure. A gas removal method, which is a desorption process.