Air filtration system for rotating disk drives having recirculat

Details Air filtration system for rotating disk drives having recirculat Air filtration system for rotating disk drives having recirculat

1984-02-13

1986-06-10

Heinz, A. J.

Dynamic magnetic information storage or retrieval

Record transport with head stationary during transducing

Disk record

360102, 360103, G11B 5012, G11B 1564, G11B 1732

Patent

active

045946264

ABSTRACT:
An internal pass-through air filtration system for a rotating memory having a recirculating air flow, such as a Winchester-type disk drive, uses a bipolar electrostatic filtering medium having a 0.3 micron filtering efficiency of approximately 50%-80%. An "electret" medium is preferred. Advantageously, the electret medium is pleated accordian-style to increase its mechanical strength and to reduce its projected area, thereby enabling it to be frictionally or otherwise seated in a relatively compact air filtration system, without the use of a supporting framework.

REFERENCES:
patent: 3386227 (1968-06-01), Czerwonka
patent: 3680287 (1972-08-01), Wood et al.
patent: 4054931 (1977-10-01), Bolton et al.
patent: 4268878 (1981-05-01), Kearns
patent: 4329722 (1982-05-01), West
patent: 4339777 (1982-07-01), Gruczelak
patent: 4367502 (1983-01-01), Iftikar et al.
patent: 4377830 (1983-03-01), Patel
patent: 4396964 (1983-08-01), Morehouse et al.
patent: 4488193 (1984-12-01), Davis et al.
Stickel, "New 50-Megabyte Disc Drive: High Performance and Reliability from High-Technology Design," Hewlett-Packard Journal, vol. 28, No. 12, (Aug. 1977).

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