Driving method and apparatus for optical printer with liquid-cry

Details Driving method and apparatus for optical printer with liquid-cry Driving method and apparatus for optical printer with liquid-cry

1984-07-09

1986-05-27

Goldberg, E. A.

Recorders

Printing, dotting, or punching marker

Ink transfer support or moving means

358300, 350350S, 350356, G01D 1514, H04N 123, H04N 129

Patent

active

045918864

ABSTRACT:
A driving method for an optical printer and an optical printer having a liquid-crystal light switching element including a ferroelectric liquid crystal sandwiched between a pair of plates provided with electrodes on adjacent surfaces thereof. The liquid-crystal light switching element is disposed between a light source and a movable photosensitive surface and controlled so as to at least one of transmit and block light from the light source to the photosensitive surface for enabling a printing operation. Voltages v.sub.1 and v.sub.2 are applied to the liquid-crystal switching element substantially in accordance with the equation ##EQU1## and the intensity of light from the light source incident on the liquid-crystal switching element is controlled so that incident light intensity during a period T.sub.2 is weaker than the incident light intensity during a period T.sub.1, where t.sub.0, t.sub.1, t.sub.2 and t.sub.3 represents times, T.sub.1 (=t.sub.1 -t.sub.0) is the period during which a printing operation is effected, T.sub.2 (=t.sub.3 -t.sub.2) is the period during which the photosensitive surface moves, v.sub.1 is the voltage which is applied to the liquid-crystal switching element during the period T.sub.1, and v.sub.2 is the voltage which is applied to the liquid-crystal switching element during the period T.sub.2.

REFERENCES:
patent: 4449153 (1984-05-01), Tschang
patent: 4508429 (1985-04-01), Nagae et al.

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