JPH0574129A - Hard disk drive - Google Patents

Abstract

PURPOSE:To furnish a hard disk drive of which the airtightness is kept completely and the shape of the shell structure of a case body is not changed and which has high reliability. CONSTITUTION:A hard disk drive is equipped with a magnetic disk 1, a magnetic head 2, a heat positioning mechanism 3, a base plate 6 as a lower case body on which the magnetic disk 1, the magnetic head 2 and the head positioning mechanism 3 are fixed and a top cover 5 as an upper case body. When an air pressure difference occurs between the inside and the outside, the shape of a bellows structure or an elastic member changes so that inside and outside air pressures become equal. Thereby an internal space is changed and occurrence of the air pressure difference is prevented.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a housing structure of a hard disk drive device.

[0002]

2. Description of the Related Art In a hard disk drive device, a slider provided with a magnetic head is floated above the surface of a magnetic disk to read and write information. The hard disk drive mechanism usually has an outer shell structure composed of a base plate and a top cover. A magnetic disk, a magnetic head, a head positioning mechanism, etc. are provided inside the outer shell structure. These internal mechanisms are so-called winchester, which is shielded from the outside by the outer shell structure in order to avoid contamination by dust. It is a method.

In the case of the conventional closed structure, a difference in atmospheric pressure is generated between the inside and the outside due to a rise in temperature accompanying operation and a change in atmospheric pressure in the outside, and as a result, the outer shell structure is deformed, and due to this distortion, magnetic The positioning accuracy such as the distance between the head and the magnetic disk may not be maintained. In order to prevent this, a minute breathing hole is provided in a part of the outer shell structure to prevent pressure difference between inside and outside, and a dust filtering filter is installed in the breathing hole to prevent intrusion of dust from the outside. Some are out. Incidentally, as related to the present invention, Japanese Patent Laid-Open No. 3-8
There is one described in Japanese Patent No. 194.

[0004]

With the conventional closed structure having a breathing hole, it is impossible to completely prevent the intrusion of dust, no matter how the filtration filter is installed.
In addition, water vapor cannot be prevented by a filter. Such dust and water vapor have a great influence on the reliability of the hard disk drive device.

The present invention has been made to solve the above problems of the prior art, and provides a completely airtight enclosure structure for a hard disk drive.

[0006]

According to the present invention, such an object is achieved by forming a part of the casing structural member by an appropriate elastic member such as a bellows structure forming a concentric corrugation. To be done.

[0007]

In the bellows structure or the elastic member, when a pressure difference between the inside and the outside occurs, the bellows structure or the elastic member is deformed so that the inner and outer pressures become equal to each other and the inner volume is changed to prevent the difference in pressure. Since the inside and outside of the housing are completely separated by the bellows structure or the elastic member, water vapor, dust, etc. do not enter inside.

[0008]

The present invention will be described below with reference to examples. 1, 2, and 3 are cross-sectional configuration diagrams showing different embodiments of the hard disk drive of the present invention.

In the hard disk drive device of the present invention shown in FIG. 1, a magnetic disk 1, a magnetic head 2, a head positioning mechanism 3, a magnetic disk 1, a magnetic head 2 and a head positioning mechanism 3 are fixed. It is composed of a base plate 6 as a lower casing and a top cover 5 as an upper casing.

Next, the operation will be described using the hard disk drive device of this embodiment.

A part of the top cover 5 of the hard disk drive device has a bellows structure in which a concentric corrugated cross section is formed by pressing or the like. When the internal atmospheric pressure rises due to the heat generated by the operation of the magnetic disk 1, a difference occurs between the internal and external atmospheric pressures, or when the external temperature rises and the external atmospheric pressure changes, the internal and external atmospheric pressures differ. There are cases. When the internal pressure becomes higher than the external pressure due to the former reason, in the conventional structure, the air inside the housing tends to flow out through the gap between the housings. In this case, there is no inflow of dust, but when the inside has cooled, the internal air pressure is lowered by the amount of the internal air that has flowed out, and air flows in from the outside. At this time, dust and water vapor flow into the interior, causing a malfunction. Further, when the amount of air coming in and out of the housing is small, the housing itself is distorted and the positioning accuracy of the magnetic head is deteriorated. In addition, due to the latter reason, even in the conventional structure in which the external atmospheric pressure becomes higher than the internal atmospheric pressure, the air outside the housing tries to flow into the inside through the gap between the housings to some extent, and the same problem as described above occurs. Let

However, in this embodiment, since a part of the top cover 5 has the bellows structure 8 having a concentric circular corrugated cross section by press working or the like, the bellows portion 8 is inside when the external atmospheric pressure becomes high. The internal pressure is adjusted so that the internal pressure becomes the same as the external pressure. On the contrary, when the internal pressure becomes high, the bellows portion 8 is deformed outward so that the internal and external pressures become equal.

The deformation of the base plate 6 can be prevented by the deformation of the bellows structure 8, and the assembling precision of the magnetic disk 1, the magnetic head 2 and the head positioning mechanism 3 which are arranged and fixed on the base plate 6 can be maintained. In addition, it is possible to maintain extremely high airtightness. This method is effectively applied when the top cover 5 does not have a structure that receives stress as an outer shell structure.

Further, in the above embodiment, a part of the top cover 5 has a bellows structure, but as shown in FIG. 2, the breathing hole 4 is formed in a part of the top cover 5 or the base plate 6.
In the case where the above is provided, the opened hole may be covered with a thin plate 7 having a bellows structure having a required size. Alternatively, the breathing hole provided in the base plate 6 may be completely covered with a bag-shaped reservoir using an elastic member such as rubber or plastic.

In the above embodiment, a part of the top cover 5 has a bellows structure, but as shown in FIG. 3, it has a bellows structure for the purpose of maintaining a perfect airtightness between the base plate 6 and the top cover 5. The thin plate 9 may be inserted. This method can be applied when the top cover 5 has a structure that receives stress as an outer shell structure. A predetermined space is provided between the top cover 5 and the thin plate 9 having a bellows structure, and the top cover 5 has a breathing hole 4
And a filter 10 is provided in the breathing hole 4. Through the breathing hole 4, the space between the top cover 5 and the thin plate 9 has the same atmospheric pressure as the outside, and the bellows structure 8 of the thin plate 9 operates in the same manner as the embodiment of FIG. In this embodiment, since the top cover 5 can also have a structure with high rigidity, it is more suitable for a high-density magnetic disk device which requires higher assembly accuracy.

The bellows structure of the top cover 5 or the dedicated thin plates 7 and 8 can be realized by press working or the like, for example, by forming a concentric cross section into a corrugated shape.

The deformation of the bellows structure can reduce the pressure difference between the inside and the outside, but it cannot be completely eliminated. It goes without saying that the outer shell structure including the base plate 6 and the top cover 5 needs to be designed to have a strength that does not cause deformation so that this residual pressure difference causes a problem.

Considering that the maximum change of the internal volume due to the deformation of the bellows is larger than that of the internal space due to the thermal expansion of the gas existing in the internal space and the change of the atmospheric pressure,
It is desirable to make it as small as possible by designing the base plate and the like.

[0019]

As described above, in the hard disk drive device of the present invention, since the bellows structure is provided in a part of the outer shell, perfect airtightness is maintained and the outer shell structure of the housing is not deformed. A highly reliable hard disk drive device can be provided.

[Brief description of drawings]

FIG. 1 is a diagram showing a schematic configuration of an embodiment of a hard disk drive device according to the present embodiment.

FIG. 2 is a diagram showing a schematic configuration of another embodiment of the hard disk drive device according to the present embodiment.

FIG. 3 is a diagram showing a schematic configuration of still another embodiment of the hard disk drive device according to the present embodiment.

[Explanation of symbols]

 1 magnetic disk 2 magnetic head 3 head positioning mechanism 4 breathing hole 5 top cover 6 base plate

Claims (4)

[Claims] 1. A hard disk drive comprising a magnetic disk, a magnetic head, and an arm for holding the magnetic head inside a housing, and a bellows structure provided in a part of an outer shell of the housing. apparatus. 2. The housing has an opening in an outer shell of the housing,
2. The hard disk drive device according to claim 1, wherein the opening is covered with a thin plate having a bellows structure. 3. A hard disk drive device comprising a housing containing a magnetic disk, a magnetic head, and an arm for holding the magnetic head, wherein the housing is the magnetic disk and the magnetic head. ,
The lower housing is composed of a lower housing and an upper housing to which the arm is fixed, and the lower housing is sealed by a thin plate having a bellows structure in at least a part thereof. A hard disk drive device characterized by being fixed while holding a predetermined space. 4. A magnetic disk, a magnetic head, and an arm for holding the magnetic head are provided inside a housing, and an opening provided in a part of an outer shell of the housing is covered with an elastic member. Hard disk drive device.