Electro-photographic printer

Details Electro-photographic printer Electro-photographic printer

1980-12-29

1983-06-07

Moses, R. L.

Photocopying

Including fiber optics

350346, 355 71, G03G 1500

Patent

active

043868363

ABSTRACT:
An electro-photographic printer utilizing a liquid crystal material which operates as a light valve. The liquid crystal material is sandwiched between two base plates which include electrodes which define a plurality of micro-shutters. A light source illuminates one side of the liquid crystal material. A driving circuit selectively applies driving signals to the electrodes for selectively opening and closing the micro-shutters to allow light from the light source to pass therethrough. A photo-sensitive drum on the other side of the liquid crystal receives the light transmitted through the liquid crystal to form characters. The characters are transmitted to a recording paper. The liquid crystal material, which has an inverted dielectric anisotropy on opposite sides of the critical frequency, is selectively driven by selectively applying two different frequency signals to the liquid crystal.

REFERENCES:
patent: 3824604 (1974-07-01), Stein
patent: 3995954 (1976-12-01), Dir et al.
patent: 4009934 (1977-03-01), Goodwin et al.
patent: 4110794 (1978-08-01), Lester et al.
patent: 4119842 (1978-10-01), Hayden et al.
patent: 4194833 (1980-03-01), Lester et al.
patent: 4236155 (1980-11-01), Nagata
patent: 4297022 (1981-10-01), Lester
Chang and Loebner, Crossover Frequencies and Turn-Off Time Reduction Scheme for Twisted Nematic L.C. Displays; Applied Physics Letters, vol. 25, No. 1, Jul. 1, 1974.
Bak, Ko and Labes, Fast Decay in a Twisted Nematic Induced by Frequency Switching; Journal of Applied Physics, vol. 46, No. 1, Jan. 1975.

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