Eye protection device for welding helmets and the like with hot

Details Eye protection device for welding helmets and the like with hot Eye protection device for welding helmets and the like with hot

1993-08-11

1996-05-21

Sikes, William L.

Optical: systems and elements

Holographic system or element

Using a hologram as an optical element

359 53, 359 93, 359359, 359590, 219147, G02F 1133, B23K 932

Patent

active

055195229

ABSTRACT:
A welding helmet including an optical protective lens including one or more liquid crystal cells as a variable optical transmission device responsive to a prescribed input to vary light transmission and light blocking characteristics thereof, and a hot mirror band pass filter having a relatively wide transmission characteristic in the visible spectrum and filtering characteristics in the infrared spectrum, the variable optical transmission device being tuned to provide a warning to indicate a nonoperating condition; and the variable optical transmission device being operative in a drive to dark mode for fast operation. Also disclosed is a method for protecting the eyes of a welder while providing a bright clear state, a fast switching to dark state, and the providing of an indication of a power off or failure state.

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