JPH0261886A - Magnetic disk device - Google Patents

Abstract

PURPOSE:To prevent data written on a disk plane from being destroyed by magnetized micro dust by providing a magnet to attract the magnetized dust at an air circulation path in the inside where an air filter is provided. CONSTITUTION:When the air on the surface of a disk is pushed out to the outside by the rotation of a magnetic disk 10, the air pressure of a space part 16 in the neighborhood of a spindle part is decreased, and the air pushed out to the outside is circulated to the space part 16 in the neighborhood of the spindle part passing through the air filter 13 to compensate the reduction of the pressure, and furthermore, it is blown out from the hole of a spacer ring 15 to the surface of the magnetic disk. In the air filter 13, a primary filter 1 is provided on an air inflow side and a secondary filter 2 on an air outflow side, and furthermore, the magnet 3 is provided in the inside. Thus, the magnetized micro dust passing the primary filter 1 is caught by the magnet 3, and no magnetized dust exists in the dust passing through the secondary filter 2, which prevents the data written on the disk plane from being destroyed.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a magnetic disk device, and particularly to a magnetic disk device having a disk enclosure (D, E,) of a sealed structure.

[Conventional technology]

Conventionally, this type of magnetic disk drive has been equipped with a closed container (disk enclosure (D, E, )) to isolate it from the outside air. Furthermore, the rotation of the magnetic disk is used to circulate the air inside the sealed container, and an air filter is provided along the path to remove dust generated inside the container. As shown in FIG. 3, the air filter used here simply uses a filter 4 with fine meshes over a wide surface area to remove dust from the eyes.

[Problem to be solved by the invention]

The air filter used in the conventional magnetic disk device described above removes particles such as dust based on their size, and therefore cannot remove particles smaller than the size of the filter. If these small particles are magnetic and come very close to the magnetic disk, such as between the magnetic disk and the magnetic head, they may cause errors or destroy data written on the magnetic disk. There was a drawback.

An object of the present invention is to provide an air filter that removes dust based on the presence or absence of magnetism in addition to the particle size.

[Means to solve the problem]

The magnetic disk drive of the present invention has a magnet for attracting magnetic dust in the air circulation path in the beam.

〔Example〕

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

FIG. 1 is a structural sectional view of the air filter of this embodiment. ■ is the primary filter on the air inflow side, 2 is the 2nd filter on the air outflow side
The next filter, 3, is a magnet, and the arrow 5 is the direction of air flow.

Next, the operation of this air filter will be explained using FIG. 2.

When the magnetic disk 10 rotates, the air on the surface of the magnetic disk is pushed outward from the center as shown by the arrows due to its rotational force. The magnetic disk 10 is fixed to a spindle section 12 via a spacer ring 15, and the spacer ring 15 is provided with a hole for blowing air out from a space 16 with the spindle section to the surface of the disk. Therefore, when the air on the disk surface is pushed outward due to the rotation of the disk, the air pressure in the space 16 around the spindle becomes low. Space part 1
6 and is further blown out onto the surface of the magnetic disk through the hole in the spacer ring.

The arrow E in FIG. 3 shows the air flow. Therefore, dust larger than the size of the filter is captured by the air filter, but dust smaller than the size of the filter passes through the air filter.

will be circulated. When the air filter of the present invention shown in FIG. The magnetic object disappears.

〔Effect of the invention〕

As explained above, the present invention can be mounted on a magnetic disk drive, or by having a structure in which a magnet is provided in the internal air circulation path, small magnetic dust can be captured by the magnet, and the magnetic dust can be captured by the magnet. This has the effect of preventing data written on the disk surface from being destroyed by small particles of dust.

...Space around the spindle, 17... Airtight container.

Claims (1)

[Claims] 1. A sealed magnetic disk drive having an air filter provided in an internal air circulation path, characterized in that the air circulation path is provided with a magnet that attracts magnetic dust.