Variable characteristic light filter

Details Variable characteristic light filter Variable characteristic light filter

1973-10-15

1976-02-03

Rolinec, R. V.

350148, 350159, G02B 124

Patent

active

039361470

ABSTRACT:
A variable color light filter system comprises a variable light filter including a pair of superimposed different color chromatic polarizing components with axes at a right angle to each other and an achromatic polarizing filter component which is rotatable relative to the chromatic polarizing components. A quarter wave length retardation plate is positioned in front of the variable light filter and has its optical axis at 45.degree. to the vertical. In another form the achromatic polarizing filter component is positioned between two pairs of superimposed chromatic polarizing components all of which are of different colors.

REFERENCES:
patent: 2184999 (1939-12-01), Land et al.
patent: 2298059 (1942-10-01), Land
patent: 2527593 (1950-10-01), Stadler
Holzinger et al., "Safety Goggles", IBM Tech. Disclosure Bulletin, Vol. 16, No. 2, July 1973, p. 647.

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