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US 4,039,254 AGranted
Electro-optic welding lens assembly using multiple liquid crystal light shutters and polarizers
AssigneeMack Gordon
InventorThomas B. Harsch
Life of this patent
Estimating the term…
Abstract
A liquid crystal welding lens assembly for use as the eyepiece of a welding helmet in which the light transmission of the lens assembly is no greater than 0.01% during the existence of a welding arc. This is achieved with the use of at least two liquid crystal light shutters and three polarizers alternately arranged in tandem.
Claims5
In a welding helmet, a protective welding lens assembly comprising at least two liquid crystal light shutters and at least three polarizers arranged alternately in tandem to achieve a maximum light transmission through the lens assembly of about 0.01%.
Dependencies are inferred from the claim text.