Automatic liquid-crystal light shutter

Details Automatic liquid-crystal light shutter Automatic liquid-crystal light shutter

1982-05-06

1985-01-01

Corbin, John K.

Radiant energy

Ionic separation or analysis

Static field-type ion path-bending selecting means

250208, 250229, 250237R, G02F 113, H01J 4014, H01J 156, G01D 534

Patent

active

044913907

ABSTRACT:
An automatic liquid-crystal light shutter includes a NAND gate integrated circuit and a pair of RC oscillators operating in cooperation with two solar cells which experience internal resistance changes in response to received light. The changes in the internal resistance of the two solar cells results in a comparison signal which is applied to each of two NAND gates along with respective oppositely faced oscillator signals. When the NAND gate output signals are of different potential, the shutter passes light with little or no attenuation. If the NAND gate output signals are of the same potential, the liquid-crystal shutter becomes highly attentuated or unpassable for light. As a result, the automatic liquid-crystal shutter automatically passes low intensity light but attenuates or blocks high intensity light.

REFERENCES:
patent: 3873804 (1975-03-01), Gordon
patent: 4039803 (1977-08-01), Harsch
patent: 4071912 (1978-02-01), Budmiger
patent: 4152846 (1979-05-01), Witt
patent: 4155122 (1979-05-01), Budmiger
patent: 4161653 (1979-07-01), Bedini et al.
patent: 4279474 (1981-07-01), Belgorod

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