Dynamic magnetic information storage or retrieval – Record transport with head stationary during transducing – Disk record
Patent
1987-08-03
1988-12-06
Tupper, Robert S.
Dynamic magnetic information storage or retrieval
Record transport with head stationary during transducing
Disk record
360 69, 360 71, 360 9702, 428695, G11B 540, G11B 560, G11B 1732, G11B 1702
Patent
active
047899131
ABSTRACT:
In a magnetic disk file having a plurality of disks and a source of organic lubricant mounted within a housing, an air flow stream recirculates within the housing. The vapor pressure of the lubricant source is controlled to provide vapor phase transport of lubricant molecules between the source and the disks' recording surfaces. The lubricant molecules bidirectionally transfer between the air stream and the source, and between the air stream and the surface of the disks, as is needed to maintain a mono-molecular lubricant film, in the range of about 3 to 15 angstroms, on the disks in accordance with the principle of Langmuir kinetics. The disks are rigid disks and their recording surface includes a carbon overcoat. This overcoat has an affinity for the airborne organic lubricant molecules.
In a first embodiment, the vapor pressure of the lubricant is controlled by mounting the material at the coolest location within the housing.
In a second embodiment, the lubricant is carried as a mono-molecular layer of lubricant on granular carbon particles which have a surface area that is many times greater than the surface area of the disks.
In a third embodiment, the vapor pressure is controlled by combining the lubricant with a vapor pressure diluent.
REFERENCES:
patent: 4626941 (1986-12-01), Sawada et al.
Gregory Thomas A.
Keller Christopher G.
Kennedy Bruce E.
Murray Bruce A.
Rothschild Wayne J.
International Business Machines - Corporation
Lahtinen Robert W.
Tupper Robert S.
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