Optical filter for protective welding lens assemblies

Details Optical filter for protective welding lens assemblies Optical filter for protective welding lens assemblies

1985-02-22

1988-03-01

Miller, Stanley D.

Electric heating

Microwave heating

Tunnel furnace

219147, 350335, 350339F, G02F 1133, B23K 922

Patent

active

047281731

ABSTRACT:
An optical filter for welding protective lens assemblies has two parallel electro-optical cells, at least one of the cells being of the nematic type with admixture of dye molecules with anisotropic light absorption. The filter comprises a filter sheet disposed in the ray path of the cells and allowing transmission within a wave range which is offset with respect to the wave range within which said one cell is transmitting residual light in its absorbing state.

REFERENCES:
patent: 3575491 (1971-04-01), Heilmeier
patent: 3612666 (1971-10-01), Rabinow
patent: 3703329 (1972-11-01), Castellano
patent: 3781465 (1973-12-01), Ernstoff et al.
patent: 3967881 (1976-07-01), Moriyama et al.
patent: 4071912 (1978-02-01), Budmiger
patent: 4154746 (1979-03-01), Huffman
patent: 4240709 (1980-12-01), Hornell
patent: 4241339 (1980-12-01), Ushiyama
patent: 4497543 (1985-02-01), Aoki et al.
patent: 4527864 (1985-07-01), Dir
patent: 4541693 (1985-09-01), Knoll et al.

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