Light shield for welder's mask

Details Light shield for welder's mask Light shield for welder's mask

1977-11-30

1979-05-22

Nerbun, Peter

Apparel

Guard or protector

For wearer's head

350150, A61F 906

Patent

active

041551222

ABSTRACT:
A welder's helmet has a window with an upper section of invariable light-attenuation characteristics and a dimmable lower section comprising an ultraviolet filter, an infrared filter, and an electro-optical shutter such as a liquid crystal sandwiched between a polarizer and an analyzer. A control circuit including a UV-sensitive photocell, upon sensing a welding arc or flame, operates the shutter to reduce the amount of light transmitted through the lower section of the window.

REFERENCES:
patent: 2773422 (1956-12-01), Flynn, Sr. et al.
patent: 3756692 (1973-09-01), Scott
patent: 3873804 (1975-03-01), Gordon
patent: 3943573 (1976-03-01), Budmiger
patent: 4039254 (1977-08-01), Harsch
patent: 4039803 (1977-08-01), Harsch

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