JPH0192987A - Air filter for magnetic disk device - Google Patents

Abstract

PURPOSE:To prevent the dust adhered initially in an air filter from being scattered by fitting a filter member having a higher capture efficiency of minute particles and fitting another filter member being more coarse than the former filter to both the air intake and suction sides of the air flow of the former filter member to the titled air filter. CONSTITUTION:A magnetic disk 8 is rotated in the direction of arrow 13, a magnetic head 11 is fitted to a positioning mechanism 9 and positioned to an object track to record and reproduce the information. The air filter 10 is arranged at a position receiving an air flow 15 caused by the rotation of the magnetic disk 8, minute dust 4 coming externally passes through a coarse filter member 2 and a captured by the filter member 1 having a high capture efficiency of minute dust. Since the coarse filter member 2 is fitted, the dust 3 adhered to the filter member 1 in the manufacture of the air filter 10 is not scattered to the outside of the filter. Thus, the dust adhered to the main filter member at the manufacture of the air filter is removed out of the main filter member due to vibration but not scattered to the outside of the air filter.

Description

Detailed Description of the Invention [Field of Industrial Application] The present invention relates to an air filter used for removing dust in equipment that requires high cleanliness, such as a magnetic disk drive. This invention relates to an air filter that does not contaminate equipment with dust.

[Conventional technology]

In order to increase the recording density of a magnetic disk device, it is required that the magnetic disk and the magnetic head be floated with a minute gap of sub-μm or less. To maintain a stable gap, it is necessary to prevent microparticles from intervening between the magnetic disk and the magnetic head, and for this purpose, the magnetic disk, magnetic head, and other mechanical parts are housed in an airtight container to prevent dust from entering the environment outside the device. In addition to blocking the intrusion of dust, an air filter is provided inside the container to allow the air flow generated as the disk rotates to pass through, thereby removing dust from inside the container.

A conventional device, as described in Japanese Unexamined Patent Publication No. 59-165281, employs a method in which the air flow generated as the magnetic disk rotates is filtered through an air filter, guided to the center of the magnetic disk, and circulated.

[Problem that the invention seeks to solve]

The above-mentioned conventional technology does not take into account the scattering of dust attached to the air filter manufacturing stage of a sealed magnetic disk drive, and the air filter manufacturing stage is affected by vibrations caused by head positioning operations and vibrations transmitted from the outside. There was a problem in that the dust attached to the device would scatter and contaminate the inside of the device.

An object of the present invention is to provide an air filter that can prevent dust that initially adheres to the air filter from scattering.

[Means for solving problems]

The above purpose is achieved by installing an air filter with a furnace material that has a high efficiency in capturing microparticles, and a filter material with a coarser mesh than the furnace material on both the inflow and outflow sides of the air flowing through the furnace material. be done.

[Effect]

Fine dust flowing from outside the air filter passes through the coarse filter material and is collected by the furnace material, which has a high collection efficiency for fine dust. - The microscopic dust collected on the furnace material will not be scattered from the furnace material even by vibrations caused by head positioning operation or the sum of vibrations transmitted from the outside, but the microscopic dust that has adhered to the furnace material during the manufacture of air filters will not be scattered from the furnace material. Dust with a size of ~m~μm may be scattered outside the air filter due to the vibrations described above. Since coarse filter media are attached to both the air inflow and outflow sides of the furnace material, during the manufacture of the air filter, several μm to m to μm particles attached to the furnace material, which has a high efficiency in capturing fine dust, are removed. Dust is not scattered outside the air filter. Further, since the filter medium has a coarse mesh, it is possible to prevent dust attached during manufacturing from scattering without increasing the filtration resistance of the air filter.

〔Example〕

An embodiment of the present invention will be described below with reference to FIGS. 1 and 2. A magnetic disk 8 is attached to a spindle 12 and rotates in the direction of arrow 13. The magnetic helad 11 is a positioning mechanism 9
It is attached to the target track and records and plays information. Each of the above-mentioned parts is fixed to the pace 14, and further kept in a sealed state by the cover 7 and the pace 14. An air filter 10 is disposed around the magnetic disk 80 between the cover 7 and the positioning mechanism 9 to receive an air flow 15 generated by the rotation of the magnetic disk 80. Fine dust 4 flowing from the outside of the air filter 10 passes through the coarse filter medium 2 and is collected by the furnace material 1, which has a high collection efficiency for fine dust. - The minute dust 4 collected on the furnace material 1 will not be scattered from the furnace material 1 even by vibrations caused by head positioning operation or vibrations transmitted from the outside, but when the air filter 10 is manufactured, the minute dust 4 collected on the furnace material 1 The attached dust 3 having a size of several micrometers to several tens of micrometers may be scattered from the furnace material due to the vibrations described above. However, the air inlet side 5 of the furnace material 1 through which the air flows. Since the coarse filter media 2 are installed on both the outflow sides 6, during the manufacture of the air filter 16, the dust of several μm to m to μm attached to the furnace material IK, which has high collection efficiency, will not be scattered to the outside of the air filter. do not have. Moreover, since the filter medium 2 has a coarse mesh, it is possible to prevent the dust 3 attached during manufacturing from scattering without increasing the filtration resistance of the air filter 16.

〔Effect of the invention〕

As described above, according to the present invention, coarse filter media are installed on both the air inflow and outflow sides of the main furnace material, which has a high efficiency of capturing microscopic dust, so when manufacturing the air filter, the main furnace material has a high filtering efficiency. Even if dust attached to the material is separated from the main furnace material due to vibrations caused by the head positioning operation or vibrations transmitted from the outside,
It can prevent the particles from scattering outside the air filter. Also,
The coarse filter medium has the effect of preventing dust attached during manufacture from scattering without increasing the filtration resistance of the air filter.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal cross-sectional view of an air filter according to an embodiment of the present invention, and FIG. 2 is a plan view of a cover of a magnetic disk drive in which the air filter of FIG. 1 is installed. 1... Furnace material, 2... Coarse filter material, 3
...Dust, 4...Minute dust, 10...
・Air filter.

Claims (1)

[Claims] 1. In a magnetic disk device that requires cleanliness, it is characterized by having a main filter medium for the purpose of collecting minute particles, and a filter medium coarser than the main filter medium on both the air inflow and outflow sides of the filter medium. Air filter for magnetic disk drives.