Patent
1979-10-26
1982-06-15
Corbin, John K.
350334, 350345, G02F 1133
Patent
active
043347347
ABSTRACT:
This invention relates to an optical apparatus for the reproduction of images, comprising an optical modulator formed by a nematic liquid crystal cell the length of which is at least equal to the width of the paper to be printed, comprising on an inner surface N electrodes corresponding to the N points forming a line and a counter electrode on the other surface, this cell being placed between two polarizers. The modulator produces or does not produce extinction of the radiation for each point, depending on whether a voltage is not or is applied between the counter electrode and the electrode corresponding to the point which is to be reproduced. The light-sensitive paper travels against the second polariser and is printed by a line of light modulated spatially along the N points. To ensure that the optical modulator thus produced functions satisfactorily, the light source should flash on when the liquid crystal has reached a stable state, i.e., just before the fluctuation in the control voltage applied between the counter electrode and the electrodes.
REFERENCES:
patent: 3622226 (1971-11-01), Matthies
patent: 4017157 (1977-04-01), van Riet
patent: 4297022 (1981-10-01), Lester
Hareng Michel
Le Berre Serge
"Thomson-CSF"
Corbin John K.
Gallivan Richard
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