Light filter for welder's mask

Details Light filter for welder's mask Light filter for welder's mask

1975-12-02

1978-02-07

Schroeder, Werner H.

Apparel

Guard or protector

For wearer's head

350150, 350352, 350356, A61F 906

Patent

active

040719120

ABSTRACT:
A welder's mask has a lens at least part of which is formed of an infrared filter, an ultaviolet filter, a polarizer, an analyzer, and an optoelectric element between the polarizer and analyzer. The optoelectric element may be a ceramic crystal or fluid crystal that is electrically energizable by means of automatic circuitry connected to an UV-sensitive photocell to rotate the polarization plane of light coming from the polarizer to the analyzer in order automatically to darken the lens when exposed to a welding flame or arc.

REFERENCES:
patent: 3737211 (1973-06-01), Cutchen et al.
patent: 3756692 (1973-09-01), Scott
patent: 3785721 (1974-01-01), Harsch
patent: 3827000 (1974-07-01), Matsushita et al.
patent: 3873804 (1975-03-01), Gordon
patent: 3943573 (1976-03-01), Budmiger

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