Driving method and apparatus for optical printer with liquid-crystal switching element
First Claim
1. A driving method for 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 being disposed between light source means and a movable photosensitive surface and being switched so as to at least one of transmit and block light from the light source means to the photosensitive surface for enabling a printing operation, the method comprising the steps of applying voltages v1 and v2 to the liquid-crystal switching element substantially in accordance with the equation ##EQU8## and controlling the intensity of light from the light source means incident on the liquid-crystal switching element so that incident light intensity during a period T2 is weaker than the incident light intensity during a period T1, where t0, t1, t2 and t3 represent times, T1 (=t1 -t0) is the period during which a printing operation is effected, T2 (=t3 -t2) is the period during which the photosensitive surface moves, v1 is the voltage which is applied to the liquid-crystal switching element during the period T1, and v2 is the voltage which is applied to the liquid-crystal switching element during the period T2.
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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 v1 and v2 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 T2 is weaker than the incident light intensity during a period T1, where t0, t1, t2 and t3 represents times, T1 (=t1 -t0) is the period during which a printing operation is effected, T2 (=t3 -t2) is the period during which the photosensitive surface moves, v1 is the voltage which is applied to the liquid-crystal switching element during the period T1, and v2 is the voltage which is applied to the liquid-crystal switching element during the period T2.
38 Citations
19 Claims
- 1. A driving method for 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 being disposed between light source means and a movable photosensitive surface and being switched so as to at least one of transmit and block light from the light source means to the photosensitive surface for enabling a printing operation, the method comprising the steps of applying voltages v1 and v2 to the liquid-crystal switching element substantially in accordance with the equation ##EQU8## and controlling the intensity of light from the light source means incident on the liquid-crystal switching element so that incident light intensity during a period T2 is weaker than the incident light intensity during a period T1, where t0, t1, t2 and t3 represent times, T1 (=t1 -t0) is the period during which a printing operation is effected, T2 (=t3 -t2) is the period during which the photosensitive surface moves, v1 is the voltage which is applied to the liquid-crystal switching element during the period T1, and v2 is the voltage which is applied to the liquid-crystal switching element during the period T2.
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10. An optical printer comprising 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 switching element being disposed between light source means and a movable photosensitive surface and being switched so as to at least one of transmit and block light from the light source means to the photosensitive surface for enabling a printing operation, means for applying voltages v1 and v2 to the liquid-crystal switching element in accordance with the equation ##EQU9## and means for controlling the intensity of light from the light source means incident on the liquid-crystal switching element so that incident light intensity during a period T2 is weaker than the incident light intensity during a period T1, where t0, t1, t2 and t3 represent times, T1 (=t1 -t0) is the period during which a printing operation is effected, T2 (=t3 -t2) is the period during which the photosensitive surface moves, v1 is the voltage which is applied to the liquid-crystal switching element during the period T1, and v2 is the voltage which is applied to the liquid crystal element during the period T2.
Specification