Dynamic magnetic information storage or retrieval – Record transport with head stationary during transducing – Drum record
Patent
1985-08-07
1986-12-30
Wolff, John H.
Dynamic magnetic information storage or retrieval
Record transport with head stationary during transducing
Drum record
360 87, 360103, G11B 560, G11B 1564
Patent
active
046333517
ABSTRACT:
Problems of wear and bounce created by imperfections in the surface of a magnetic recording medium, such as a chromium dioxide-coated drum, are circumvented by a hydrodynamic magnetographic imaging technique that provides the intended effective intimate contact between the recording head the magnetographic recording surface. A readily evaporatable liquid (e.g. water, alcohol, acetone) is applied to the surface of the drum slightly upstream of the location of the recording head, so as to create a liquid bearing against which the recording head is urged, and thereby intimately magnetically coupled with the surface of the drum, except for an extremely thin liquid film between the head and drum surface. As a result of this extremely thin liquid bearing, continuous pressure can be applied to the head to maintain the head in effective intimate contact with the surface of the recording medium without the fear of scratching the medium or causing wear on the head. Moreover, once the imaging process has been completed, and the recording head is retracted away from the drum (and the liquid bearing) the liquid bearing can be easily removed, as the liquid of which the bearing if formed, readily evaporates without leaving a residue, so that the drum is ready for the application of toner particles at a print station.
REFERENCES:
patent: 2969435 (1961-01-01), Lynott
patent: 3005675 (1961-10-01), Ledin et al.
Bardos Andrew M.
Duchesne Mark F.
Holmes Jon E.
Harris Graphics Corporation
Wolff John H.
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