Welding helmet with eye piece control

Details Welding helmet with eye piece control Welding helmet with eye piece control

1976-06-03

1978-06-27

Goldberg, Elliot A.

Electric heating

Metal heating

Weld rod composition

2 8, B23K 932

Patent

active

RE0296848

ABSTRACT:
A protective welding lens assembly is shown, as for use in the eye piece of a welding helmet, utilizing a liquid crystal together with an electrical circuit which applies a suitable electrical potential to the liquid crystal to change the same from a uniform light transmitting condition to a uniform approximately opaque condition of very small light transmission solely in response to approach to the welding electrode close to the workpiece to be welded.

REFERENCES:
patent: 3731986 (1973-05-01), Fergason
patent: 3741629 (1973-06-01), Kahn
patent: 3918796 (1975-11-01), Fergason
Kahn, Applied Physics Letters, vol. 18, No. 6, 3/71, "Cholesteric Liquid Crystals for Optical Applications", p. 231.

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