Disk drive with flow-by chemical breather filter

Details Disk drive with flow-by chemical breather filter Disk drive with flow-by chemical breather filter

1993-12-16

1994-11-22

Tupper, Robert S.

Dynamic magnetic information storage or retrieval

Record transport with head stationary during transducing

Disk record

G11B 1702

Patent

active

053674170

ABSTRACT:
A data recording disk drive has an improved breather filter assembly that removes both chemical contaminants and particulate matter. The filter assembly includes a housing having an internal passage and a recess that supports and contains the chemical and particulate filter elements, The passage in the filter housing provides fluid communication between the breather opening and a sheet of chemical filter material. A barrier plate is also located in the filter housing recess adjacent to the side of the chemical filter sheet not exposed to air from the passage. The barrier plate prevents air from flowing through the chemical filter material and redirects the air flow across the surface of the chemical filter sheet. After the air flows by the chemical filter sheet, it is redirected through the particulate filter element and into the disk drive enclosure. The air entering the disk drive enclosure does not generally enter into the interior of the chemical filter material by forced conduction, but flows by the surface of the material so that the chemical filter does not significantly increase the flow impedance of the filter assembly, as in prior art breather filter assemblies. The flow across the surface of the material allows contaminants to diffuse into the getter material and become trapped.

REFERENCES:
patent: 4633349 (1986-12-01), Beck et al.
patent: 4684510 (1987-08-01), Harkins
patent: 4863499 (1989-09-01), Osendorf
patent: 5030260 (1991-07-01), Beck et al.
patent: 5124856 (1992-06-01), Brown et al.
E. P. Schultz et al., "Laminar Flow Thin Chemical Breather Filter for Direct Access Storage Device", IBM Technical Disclosure Bulletin, vol. 34, No. 8, Jan., 1992, pp. 341-342.

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