Gas separation: apparatus – Magnetic separating means
Patent
1974-11-25
1976-08-10
Klein, David
Gas separation: apparatus
Magnetic separating means
96 1C, G03G 1302, G03G 1324
Patent
active
039739562
ABSTRACT:
An electrostatic imaging method wherein the photoconductive coating of an electrophotograhic film is charged simultaneously with its exposure to a scene to be recorded, the charging step ceasing when a level of charge has been reached which is optimum for the light condition of the scene and with toning being commenced immediately subsequent to the cessation of the charging. Light from the scene is cut off immediately prior to commencement of toning. The film utilized is capable of accepting a charge at a rate faster than the light of a scene to be recorded discharges the film.
The method is preferably practiced utilizing a camera which includes projecting means for prjecting a scene onto the film, a corona generating system, a toning system, means for measuring the light coming through the projector, means for measuring the surface potential of a dark area of the flm while it is being charged and an electronic control circuit which operates the charging system in response to the measured light.
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patent: 3185051 (1965-05-01), Goffe
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patent: 3680955 (1972-08-01), Yata et al.
patent: 3788739 (1974-01-01), Coriale
Coulter Information Systems, Inc.
Klein David
Miller John R.
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