Optical: systems and elements – Holographic system or element – Using a hologram as an optical element
Patent
1990-07-24
1992-03-10
Heyman, John S.
Optical: systems and elements
Holographic system or element
Using a hologram as an optical element
340784, G02F 113
Patent
active
050953761
ABSTRACT:
An apparatus and method for driving an optical printer having at least one liquid crystal optical switch including a ferroelectric liquid crystal layer interposed between a pair of substrates having electrodes on confronting surfaces thereof, the at least one liquid crystal switch being disposed between a light source and a photosensitive surface, a light transmission state of the at least one liquid crystal optical switch being controlled by application of a voltage signal to the at least one liquid crystal optical switch so as to control light transmission to the photosensitive surface. A first voltage signal is applied to the liquid crystal of at least one liquid crystal optical switch in a writing period in which the light transmission state is determined in accordance with a printing signal for printing. A second voltage signal having a DC component of one polarity is applied to the liquid crystal layer in a retention period. A third voltage signal having a DC component of an opposite polarity is applied to the liquid crystal layer in a reset period in which the at least one liquid crystal optical switch is placed in a light interrupting state, and a fourth voltage signal having a DC component of the one polarity is applied to the liquid crystal layer in a period other than an excluding period which is formed of the writing period, the retention period and the reset period.
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Igawa Tatsuo
Nagata Tetsuya
Umeda Takao
Heyman John S.
Hitachi , Ltd.
Mai Huy K.
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