Charged particle modulator device and improved imaging methods f

Details Charged particle modulator device and improved imaging methods f Charged particle modulator device and improved imaging methods f

1975-02-24

1977-05-31

Welsh, John D.

Gas separation: apparatus

Magnetic separating means

355 3R, 96 14, G03G 1314

Patent

active

040267008

ABSTRACT:
A three-layered modulator, made up by sandwiching a photoconducting layer between a metal screen and an insulating layer, is applied separate and distinct fringing fields across the insulating layer corresponding to the image and non-image portions. The process calls for illuminating and applying a blanket electrostatic D.C. charge; simultaneously illuminating the modulator with a pattern of light and shadow and applying an oppositely poled D.C. charge; bringing the surface to an equi-potential level by applying an A.C. charge through a balanced A.C. corona or constant voltage A.C. scorotron; and in the final step, flood illuminating.

REFERENCES:
patent: 3615395 (1971-10-01), Yamaji
patent: 3625604 (1971-12-01), Pressman
patent: 3645614 (1972-02-01), McFarlane
patent: 3666365 (1972-05-01), Fanaka
patent: 3680954 (1972-08-01), Frank
patent: 3694200 (1972-09-01), Pressman

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