Color filter determining apparatus with indication of the color

Details Color filter determining apparatus with indication of the color Color filter determining apparatus with indication of the color

1975-09-23

1976-10-12

McGraw, Vincent P.

Optics: measuring and testing

Refraction testing

Prism engaging specimen

355 38, 356178, G01J 346, G01B 2778

Patent

active

039854507

ABSTRACT:
A color filter-determining apparatus, which indicates the color component to be balanced, has two measuring circuits, each of which contains a pair of photoelectric transducers. One of the photoelectric transducers in each measuring circuit is sensitive to the same primary color and the other transducers are sensitive to different primary colors. The measuring circuits comprise resistance measuring bridges, which are complemented by resistors and diagonally supplied by separate power sources and also diagonally connected to inputs of operational amplifiers, such as sum-and-difference amplifiers.

REFERENCES:
patent: 3819275 (1975-06-01), Aimi et al.

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