Glare shielding device and process for operating same

Details Glare shielding device and process for operating same Glare shielding device and process for operating same

1992-12-22

1994-05-24

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Photocell controls its own optical systems

359 63, G01J 120

Patent

active

053150996

ABSTRACT:
An electro-optical glare shielding device for protective glasses, protective helmets or protective masks, which includes an electro-optical glare shield including at least one liquid crystal cell, an electronic circuit connected to the electro-optical glare shield for applying an electric operating voltage thereto for varying the optical transmission value of the at least one liquid crystal cell, a light sensor connected to the electronic circuit for providing an input signal thereto indicative of sensed light adjacent to the electro-optical glare shielding device and in which the electronic circuit produces an electric operating voltage such that the optical transmission value of the at least one liquid crystal cell is less than 1% and the electric operating voltage frequency is less than 32 Hertz.

REFERENCES:
patent: 4240709 (1980-12-01), Hornell
patent: 4701021 (1987-10-01), Le Pesant et al.

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