Automatic liquid crystal light-shutter

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

1985-12-31

1988-07-26

Miller, Stanley D.

350332, G02F 113

Patent

active

047596082

ABSTRACT:
An automatic liquid crystal light-shutter which detects directly the flashing light generated by an alternating current electric welding machine, by means of a photo diode detector and then converts the detected light into an alternating signal current. Then this signal current is filtered to remove miscellaneous signals, amplified and rectified. Next, the rectified signal is fed to an inverter circuit which controls the oscillating of an oscillating circuit that operates a liquid crystal display to function very swiftly.

REFERENCES:
patent: Re29684 (1978-06-01), Gordon
patent: 4039803 (1977-08-01), Harsch
patent: 4152846 (1979-05-01), Witt
patent: 4155122 (1979-05-01), Budmiger
patent: 4240709 (1980-12-01), Hornell
patent: 4241286 (1980-12-01), Gordon

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