Apparatus for controlling humidity in a disk drive

Details Apparatus for controlling humidity in a disk drive Apparatus for controlling humidity in a disk drive

1984-09-04

1986-10-28

Tupper, Robert S.

Dynamic magnetic information storage or retrieval

Record transport with head stationary during transducing

Disk record

236 44R, 360 98, G11B 5012, B01F 302, G05D 2100

Patent

active

046202480

ABSTRACT:
A disk drive is provided with a vent tube which is long (i.e., 20 inches) compared to its bore (i.e., 0.013 inch) to minimize diffusion of water vapor into the drive without seriously affecting pressure gradients along the length. Minimum bore diameters are given for specified lengths of vent tube. Conveniently, a desiccant is employed with a heater to absorb water vapor admitted to the drive and to expel water vapor when the drive is operated. A thermally-operated valve is also employed to expel water vapor when the drive operates. The desiccant may be employed in a chamber separated from the disk chamber, whereupon pressure valves are provided to adjust the pressures in the drive.

REFERENCES:
patent: 2152586 (1939-03-01), Freeman
patent: 3859616 (1975-01-01), Ladany
patent: 4307425 (1981-12-01), Kaneko et al.
patent: 4418369 (1983-11-01), Applequist et al.
patent: 4429336 (1984-01-01), Berube et al.
Wheeler, S. E. Atmospheric Pressure Compensator for Disk Files IBM Technical Disclosure Bulletin, vol. 20, No. 5, (Oct. 1977), pp. 1891-1892.

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