JPS6396790A - Magnetic disk device - Google Patents

Abstract

PURPOSE:To prevent a dehumidifying agent, a deoxidier and a rust preventive from being last and to evade each member in the interior from being deteriorated by completely blocking air in and outside and attaining a shroud with a hermetical seal structure. CONSTITUTION:The shroud 14 completely houses a spindle motor 6. Besides to that, the shroud 14 houses a magnetic disk 5, an actuator 10, and a magnetic head 12 installed on an arm 11. At least one of the dehumidifying agent, the deoxidier and the rust preventive 13 is provided in the shroud 14. In such a magnetic disk device the shroud 14 is constituted so as to have the hermetical seal structure which can completely block air in and outside. Thus the function of each member is kept satisfactory for a long time, whereby the service life of the entire magnetic disk device is prolonged.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a magnetic disk device, and more particularly to a magnetic disk device suitable for maintaining a long life of the constituent members of the magnetic disk.

[Conventional technology]

In conventional magnetic disk drives, (1) technology to prevent outside air from entering the shroud through the spindle bearings, (2) technology to remove moisture and harmful gases from entering the shroud using a breathing filter, (5) Techniques have been proposed in which specially treated air or special gas is sealed in the shroud from the beginning.

As a conventional technique corresponding to the above (1), there are the following techniques.

Japanese Patent Publication No. 5B-24862 Publication No. 56-98760 Publication No. 56-105375 Publication No. 5490-1980 In addition, as conventional techniques corresponding to the above (2), the following techniques are available. There is.

JP-A-56-15570, JP-A-58-48278, JP-A-58-56269, JP-A-58-70467, JP-A-58-94175, JP-A-60-147983, and Conventional technologies corresponding to (3)K include the following technologies.

Japanese Patent Application Publication No. 56-105576 Japanese Unexamined Patent Publication No. 56-105377 Japanese Patent Application Publication No. 57-98164 Japanese Patent Application Publication No. 58-56270 Next, the prior art will be explained with reference to the drawings.

FIG. 5 is a side view showing the prior art with the shroud cut away, and FIG. 6 is an enlarged vertical sectional side view of the spindle motor and half of the spindle portion.

As shown in FIG. 5, the shroud 1 has a base 2,
It is configured in combination with a cover 6.

The air filter 1 is provided with a breathing filter 4. This breathing filter 4 eliminates the pressure difference between the inside of the shroud 1 and the outside air.

Inside the shroud 1 are a magnetic disk 5, a spindle motor 6 for rotating it, a spindle shaft 7 for supporting it, an actuator 10 for a magnetic head, an arm 11 connected to this, and an arm 11 connected to this. A magnetic head 12 and a dehumidifier/deoxidizer/rust preventive agent 13 are housed therein.

The spindle shaft 7 is supported by a bearing 8.

A magnetic fluid seal 9 is attached near the bearing 8.

The dehumidifier/deoxidizer/rust preventive agent 13 is provided to prevent adhesion caused by moisture between the magnetic disk 5 and the magnetic head 12, and to prevent oxidation and corrosion of the magnetic head 12 and the like.

The magnetic disk 5 is rotationally driven by a spindle motor 6, and the magnetic head 12 is moved and positioned through an actuator 10 and an arm 11. The magnetic head 12 reads information from the magnetic disk 5 and writes information to the magnetic disk 5.

By the way, in the prior art, no consideration is given to extending the life of the dehumidifier/deoxidizer/rust preventive agent 15.

Further, although a magnetic fluid seal 9 is provided near the bearing 8 of the spindle shaft 7, this magnetic fluid seal 9 is only used to prevent dust from entering into the shroud 1 from the outside. , it is not used to make the shroud 1 a sealed structure.

[Problem that the invention seeks to solve]

In the prior art, the shroud 1 has a sealed structure.

Sealoud 1 through breathing filter 4 etc.
The inside is in communication with the outside air. For this reason, shroud 1
If the dehumidifier/deoxidizer/rust preventive agent 15 installed inside is dissipated to the outside and the life of these dehumidifier/deoxidizer/rust preventive agent 15 is shortened, the magnetic disk 5, magnetic head 12, etc., shroud There is a problem in that the functions of each member housed in the magnetic disk drive are deteriorated, and the life of the entire magnetic disk drive is shortened.

An object of the present invention is to provide a magnetic disk device that solves the problems of the prior art, eliminates the dissipation of dehumidifiers, deoxidizers, and rust preventive agents, and prevents functional deterioration of each member housed in a shract. It is about providing.

[Means for solving problems]

The above object is achieved by making the sealact a sealed structure that completely blocks the air inside the sealant from the outside air.

[Effect]

In the present invention, since the shroud has a completely sealed structure, it is possible to prevent the dehumidifier, deoxidizer, and rust preventive agent installed in the shroud from escaping. As a result, the lifespan of the dehumidifier, deoxidizer, and rust preventive agent can be maintained for a long time, and the functions of each component housed in the shroud can be maintained for a long period of time. It is possible to maintain a long service life.

〔Example〕

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

FIG. 1 shows a first embodiment of the present invention, and is a side view showing a broken shroud.

In the magnetic disk drive of this first embodiment, the breathing filter is not provided, and the shroud 14 has a sealed structure capable of completely blocking the air inside the shroud from the outside air.

Further, the spindle motor 6 is completely housed inside the shroud 14. Furthermore, a magnetic disk 5, an actuator 10, and a magnetic head 12 provided on an arm 11 are housed inside the shroud 14. Inside the shroud 14, at least one of a dehumidifier, a deoxidizer, and a rust preventive agent 15 is installed.

In the magnetic disk drive of the first embodiment, the shroud 14 does not have a breathing filter, and the spindle motor 6 is completely housed within the shroud 14.
4 has a completely sealed structure.

As a result, the dehumidifier installed in the shroud 14
Since the deoxidizer/rust preventive agent 13 is not dissipated to the outside and is not wasted, the life of the dehumidifier/deoxidizer/rust preventive agent 13 can be maintained for a long time. Therefore, the functions of each member housed within the shroud 14 can be maintained well for a long period of time, thereby extending the life of the entire magnetic disk device.

Regarding the other configuration 9 effects of this first embodiment,
This is similar to that shown in FIGS. 5 and 6 above.

Next, Figure 2 shows a second embodiment of the present invention, a side view with the shroud cut away, and Figure 3 is an enlarged longitudinal section of half of the spindle motor and spindle shaft shown in Figure 2. FIG.

This second embodiment differs from the first embodiment in the following points.

That is, a portion 6' of the spindle motor 6 is protruded to the outside of the shroud 14, and a plurality of magnetic fluid seals 15 are provided near the bearing 8 of the spindle shaft 7.

Two of the magnetic fluid seals 15 are provided in a space surrounded by the spindle motor 6 and the bearing 8 supporting the spindle shaft 7 .

In this fifth embodiment, a portion 6 of the spindle motor 6
Even if ' is protruding from the shroud 14, the gap between the spindle motor 6 and the spindle shaft 7 is strongly sealed by two pressure-resistant magnetic fluid seals 15 that are stacked one on top of the other. As a result, Sealoud 14
The inside has a completely sealed structure.

Regarding other configuration 1 effects of this second embodiment,
This is the same as the first embodiment.

Next, FIG. 4 shows a third embodiment of the present invention,
FIG. 2 is an enlarged longitudinal sectional side view of a spindle motor and half of a spindle shaft portion.

This fifth embodiment differs from the second embodiment in the following points.

That is, on the outside of the two bearings 8.8 on which the spindle 7 is supported, a magnetic fluid seal 15a.

15b is provided.

The magnetic fluid seals 15a, 15b prevent air from expanding due to temperature rise within the shroud 14, and the bearings 8, 15b.
By balancing the expansion of air due to heat generation, the bearings 8, 8 are isolated from both the air inside the shroud 14 and the outside air, and the space between the bearings 8, 8 is sealed.
We are trying to improve pressure resistance.

The other configuration 1 functions of this third embodiment are the same as those of the second embodiment.

〔Effect of the invention〕

In the present invention described above, since the shroud has a sealed structure that completely blocks the air inside the shroud from outside air, it is possible to prevent the dehumidifier, deoxidizer, and rust preventive agent installed in the shroud from dissipating. Can be done. As a result, according to the present invention, the life of the dehumidifier, deoxidizer, and rust preventive agent can be maintained for a long time, and therefore the functions of each component housed in the Sea Loud can be maintained in good condition for a long period of time. This has the effect of prolonging the life of the entire magnetic disk device.

[Brief explanation of the drawing]

Fig. 1 shows a first embodiment of the present invention, a side view with the searoud cut away, and Fig. 2 shows a second embodiment of the invention, with the shroud cut away. FIG. 3 is an enlarged vertical sectional side view of half of the spindle motor and spindle shaft portion of FIG. 2, and FIG. 4 shows a third embodiment of the present invention. FIG. 5 is an enlarged longitudinal sectional side view of a half of the same spindle motor and spindle shaft, and FIG. 5 is a side view showing the prior art with the shroud cut away. FIG. be. 5... Magnetic disk, 6... Spindle motor, 7
...Spindle shaft, 8...Bearing, 10
...Actuator, 12...Magnetic head, 13.
...Dehumidifier, deoxidizer, rust preventive, 14...Shracto,
15, 15a. 151)...Magnetic fluid seal. 20th Yu) Prisoner 4 Prisoner/J Magnetism J (伜し)し 15戊、Ninja!
k filter

Claims (1)

[Claims] 1. A magnetic disk that includes a magnetic disk, a spindle motor that rotates the magnetic disk, a magnetic head that reads information from and writes information to the magnetic disk, and a shroud that accommodates these members. A magnetic disk drive, characterized in that the shroud has a sealed structure that completely blocks air inside the shroud from outside air. 2. A magnetic disk drive according to claim 1, characterized in that the shroud has a sealed structure by eliminating the breathing filter and completely housing the spindle motor inside the shroud. 5. The magnetic disk according to claim 1, wherein the shroud has a sealed structure by eliminating the breathing filter and providing a plurality of magnetic fluid seals near the bearing of the spindle shaft. Device. 4. The magnetic disk device according to claim 2, wherein the bearing is isolated from both the air inside the shroud and the outside air by a magnetic fluid seal. 5. A magnetic disk device according to claim 1, characterized in that at least one of a dehumidifier, a deoxidizer, and a rust preventive is installed in the shroud.