JPH05159558A - Magnetic disk device - Google Patents

Abstract

PURPOSE:To enhance the reliability of a magnetic disk device by a method wherein, after the rotation of a magnetic disk has been stopped and when the pressure inside of the magnetic disk device becomes lower than that of the open air, it is prevented that a corrosive gas contained in the open air creeping form a gasket or the like creeps and a danger that the magnetic disk is damaged is eliminated. CONSTITUTION:A magnetic desk device is provided with a magnetic disk 1 and a magnetic-head positioning mechanism 7; it is hermetically sealed with a base plate 8 and a cover 9. A gasket 10 provided with active carbon fibers 13 is sandwiched at the bonding part of the base plate 8 to the cover 9. A corrosive gas contained in the open air creeping from the outside is adsorbed by the active carbon fibers 13 and removed.

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, and more particularly to a magnetic disk device in consideration of removal of corrosive gas invading the inside of the device.

[0002]

2. Description of the Related Art FIG. 3 is a sectional view showing an example of a conventional magnetic disk device. A plurality of magnetic disks 1 are stacked and held on a spindle hub 3 via a spacer ring 2. The spindle hub 3 is fixed to the rotating shaft 4, and the rotation of the rotating shaft 4 causes the plurality of magnetic disks 1, the spacer ring 2 and the spindle hub 3 to rotate integrally. Magnetic heads 6 are arranged on the front and back of the plurality of magnetic disks 1 so that data can be read and written. The plurality of magnetic heads 6 are attached to the tip of a positioning mechanism 7 that moves the magnetic heads 6 to arbitrary positions. ing.
The magnetic disk 1 integrally attached to the positioning mechanism 7 and the spindle hub 3 is housed in the base plate 8 and the cover 9, and is shielded from the external space. A gasket 20 is sandwiched at the joint between the base plate 8 and the cover 9.

[0003]

In the conventional magnetic disk device, after the rotation of the magnetic disk is stopped, the pressure inside the magnetic disk device is lower than the pressure of the outside air, so that the air is breathed through the breathing hole and the gasket. At this time, there is a problem that the corrosive gas in the outside air may enter the magnetic disk device and damage the magnetic disk. An object of the present invention is to solve the above problem, and to provide a magnetic disk device capable of preventing the corrosive gas from entering the magnetic disk device to prevent the damage of the magnetic disk and improve the reliability of the device. is there.

[0004]

In order to achieve the above object, a magnetic disk device according to the present invention comprises a rotating shaft which rotates integrally with a spindle hub for stacking and holding a plurality of magnetic disks via spacer rings. A magnetic head for reading and writing data to the magnetic disk, a magnetic head positioning mechanism for positioning the magnetic head by moving the magnetic head to an arbitrary track, and for shielding and sealing the magnetic disk and the magnetic head positioning mechanism from the outside. In a magnetic disk device comprising a base plate and a cover, and a gasket interposed at the joint between the base plate and the cover, the gasket is formed integrally by enclosing an activated carbon fiber for removing gas. In addition, a rotary shaft that rotates integrally with a spindle hub that stacks and holds a plurality of magnetic disks via spacer rings, a magnetic head that reads and writes data from and on the magnetic disks, and the magnetic head is optional. A magnetic head positioning mechanism that moves and positions the track on
A base plate and a cover for shielding and sealing the magnetic disk and the magnetic head positioning mechanism from the outside,
In a magnetic disk device having a gasket interposed at the joint between the base plate and the cover, the gasket has a catalyst containing at least one of copper and silver.

[0005]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in more detail below with reference to the drawings. FIG. 1 is a block diagram showing an embodiment of a magnetic disk device according to the present invention. In FIG. 1, the same reference numerals as those used in the conventional example have the same configuration. As in the case of FIG. 2, the magnetic disk device of this embodiment is provided with a plurality of magnetic disks 1 mounted integrally on a spindle hub 3 via a spacer ring 2 and a spindle hub 3. The rotary shaft 4 and a magnetic head positioning mechanism 7 mounted on the front and back of the magnetic disk 1 and equipped with a magnetic head 6 for reading and writing are provided. A plurality of magnetic disks 1 integrally attached to the spindle hub 3 and a magnetic head positioning mechanism 8
Are housed in a container composed of the base plate 8 and the cover 9. A gasket 10 is sandwiched at the joint between the base plate 8 and the cover 9. A breathing hole 11 is provided on the upper part of the cover, and a filter 12 is attached to the entrance and exit of the breathing hole 11.

When the rotation of the magnetic disk 1 is stopped, a pressure difference is generated inside and outside the magnetic disk device. Due to this pressure difference, outside air enters the inside of the magnetic disk device through the breathing hole 11 and the gasket 10. Therefore, gasket 1
Activated carbon fibers 13 are provided inside the gasket 10 in order to prevent the corrosive gas in the outside air from entering the inside of the magnetic disk device from 0. As shown in FIG. 2, gasket 1
The cross section of No. 0 is concave, and the activated carbon fiber 13 is put in the recess. This allows the activated carbon fibers 3 to adsorb and remove the gas that has penetrated into the magnetic disk device through the gasket 10. Since the activated carbon fiber 3 is used, it is easier to handle than other spherical activated carbons.

As another embodiment, the adsorbent provided inside the gasket 10 may contain a noble metal catalyst containing copper or silver instead of the activated carbon fiber. When the corrosive gas of the outside air enters the inside of the magnetic disk device through the gasket 10,
The corrosive gas is adsorbed by causing a chemical reaction with the precious metal catalyst. This prevents the corrosive gas in the outside air from entering the inside of the magnetic disk device.

[0008]

As described above, according to the present invention, by containing the activated carbon fiber or the noble metal catalyst in the gasket sandwiched at the joint between the base plate and the cover,
Since the corrosive gas in the outside air that enters the inside of the magnetic disk device can be effectively removed, the magnetic disk can be prevented from being damaged and the reliability of the device can be improved.

[Brief description of drawings]

FIG. 1 is a sectional view showing an embodiment of a magnetic disk device according to the present invention.

FIG. 2 is an enlarged view showing details of a gasket portion of FIG.

FIG. 3 is a cross-sectional view of a conventional magnetic disk device.

[Explanation of symbols]

 1 ... Magnetic disk 2 ... Spacer ring 3 ... Spindle hub 4 ... Rotating shaft 5 ... Bearing 6 ... Magnetic head 7 ... Magnetic head positioning mechanism 8 ... Base plate 9 ... Cover 10 ... Gasket 11 ... Breathing hole 12 ... Filter 13 ... Activated carbon fiber

Claims (2)

[Claims] 1. A rotary shaft that rotates integrally with a spindle hub that stacks and holds a plurality of magnetic disks via spacer rings, a magnetic head that reads and writes data from and on the magnetic disks, and the magnetic disk. A magnetic head positioning mechanism for moving the head to an arbitrary track for positioning, a base plate and a cover for shielding and sealing the magnetic disk and the magnetic head positioning mechanism from the outside, and a gasket at a joint portion of the base plate and the cover. In the magnetic disk device with the interposition of the above, the gasket is formed integrally by enclosing activated carbon fibers for removing gas. 2. A rotary shaft that rotates integrally with a spindle hub that stacks and holds a plurality of magnetic disks via spacer rings, a magnetic head that reads and writes data from and on the magnetic disks, and the magnetic disk. A magnetic head positioning mechanism for moving the head to an arbitrary track for positioning, a base plate and a cover for shielding and sealing the magnetic disk and the magnetic head positioning mechanism from the outside, and a gasket at a joint portion of the base plate and the cover. In the magnetic disk device, the gasket includes a catalyst containing at least one of copper and silver.