JPH02281496A - Magnetic disk device - Google Patents

Abstract

PURPOSE:To eliminate the circulation of dust and its sticking on an internal surface and to improve the reliability by providing a dust cleaning filter around the outer periphery of a magnetic disk. CONSTITUTION:The filter 6 is installed along the internal wall of a container- shaped base plate 5 where a driving shaft 1 and a positioning drive part 3 are mounted while a specific gap is left around the internal wall and the outer peripheral part of the magnetic disk 2. An air flow produced as the magnetic disk 2 rotates moves in its outer peripheral direction, so air passing on the surface of the disk 2 is filtered by the filter 6 immediately to collect dust. Consequently, the dust neither circulates inside nor stays on the internal surface, so the reliability is improved.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to magnetic disk drives, and more particularly to the structure of a filter for a magnetic disk drive.

[Conventional technology]

Conventionally, this type of magnetic disk device, as shown in FIGS. 2(a) and 2(b), includes a drive shaft 1 that rotationally drives a plurality of magnetic disks 2 for recording information, and a drive shaft 1 that rotates a plurality of magnetic disks 2 for recording information, and a drive shaft 1 that rotates a plurality of magnetic disks 2 that record information. A magnetic head 4 that faces each other for recording and reproducing information, a positioning drive section 3 that holds and positions the magnetic head 4, and a base plate 5 attached surrounding them, which is sealed with a cover 7.・It consists of a disk assembly (hereinafter referred to as HDA), and in order to purify the dust generated inside this sealed HDA, the inner wall of the hub part that makes up the drive shaft and the surplus space inside the HDA (for example, near the side of the magnetic head or the top of the magnetic disk surface)
A unitized filter 6 was installed in, etc.

[Problem to be solved by the invention]

In the conventional magnetic disk drive described above, dust is purified by using the air circulation effect caused by the pressure difference inside the HDA that occurs as the magnetic disk rotates, but with the conventional filter arrangement, the magnetic disk The air passing over each surface of the magnetic disk cannot be purified immediately; in other words, the dust on the magnetic disk surface is purified after some circulation inside the HDA, or it remains on the inner wall of the HDA and the dust on the magnetic disk surface is purified. After the rotation has stopped, the magnetic disk may fall onto the magnetic disk surface again, causing damage to the magnetic disk or magnetic head, resulting in a crash and reducing the reliability of the magnetic disk drive.

[Means to solve the problem]

The present invention provides a drive shaft that is directly connected to a plurality of magnetic disks and drives them to rotate, a magnetic head that records and reproduces information while facing each of the surfaces of the plurality of magnetic disks, and a drive shaft that holds and positions the magnetic heads. a positioning drive unit for mounting the filter, a dust purifying filter surrounding the outer periphery of the plurality of magnetic disks, a positioning drive unit for the drive shaft 1, a base plate on which the filter is mounted, and a cover for sealing the base plate. ing.

〔Example〕

Next, the present invention will be explained with reference to the drawings.

FIG. 1(a) is a sectional view showing an embodiment of the present invention. In FIG. 1(a), 1 is a drive shaft that is directly connected to a plurality of magnetic disks 2 and drives them to rotate, and 3 is a magnetic head 4 that faces each of the two surfaces of the plurality of magnetic disks and records and reproduces information. 5 is a positioning drive section for holding and positioning the drive shaft 11 and a container-shaped base plate on which the positioning drive section 3 is mounted. This base plate 5 has a structure that is sealed by covering it with a cover (not shown). Reference numeral 6 denotes a filter of the present invention, which is installed along the inner wall of the base plate 5 and with a predetermined gap between the inner wall and the outer periphery of the magnetic disk 2 .

FIG. 1(b) is a sectional view showing another embodiment of the present invention. FIG. 1(b) shows a partially modified arrangement of the filter 6 shown in FIG. 1(a), which is installed so as to surround the outer periphery of the magnetic disk 2 except for the area where the magnetic head 4 is driven.

〔Effect of the invention〕

As explained above, according to the magnetic disk device of the present invention, since the filter is provided along the outer periphery of the magnetic disk,
Air generated as the magnetic disk rotates flows toward its outer layer. Therefore, the air passing over the surface of the magnetic disk is immediately filtered and dust is captured. Therefore, dust does not circulate inside the HDA, and
This prevents the particles from staying on the inner wall of A and falling onto the surface of the magnetic disk again after the rotation of the magnetic disk has stopped.

Therefore, there is no damage to the magnetic disk or magnetic head, and the reliability of the magnetic disk device is improved.

Claims (1)

[Claims] A drive shaft that is directly connected to and rotates a plurality of magnetic disks, a magnetic head that records and reproduces information while facing each of the surfaces of the plurality of magnetic disks, and a positioning drive section that holds and positions the magnetic heads. a dust purifying filter that surrounds the outer periphery of the plurality of magnetic disks, the drive shaft, the positioning drive unit, and a base on which the filter is mounted.
A magnetic disk device comprising: a plate; and a cover that seals the base plate.