Radiant energy – Photocells; circuits and apparatus – Photocell controls its own optical systems
Patent
1976-08-03
1977-09-13
Nelms, David C.
Radiant energy
Photocells; circuits and apparatus
Photocell controls its own optical systems
250226, 240 31, 350269, G01J 132
Patent
active
040484939
ABSTRACT:
A device for producing variable colors from projected white light and quantifying the color changes resulting therefrom is provided which is useful in color-styling designs and color shade matching. The device comprises (1) an adjustable color filter having at least two primary-color areas upon which a portion of said projected white light is incident, (2) light-attenuation means which attenuates the quantity of light transmitted from (by attenuating either the incident white light or transmitted color light) each of the primary-color areas as well as the portion of the projected light which is transmitted unfiltered, and (3) control means comprising (a) a light-measuring unit for measuring the transmitted light and generating a signal proportional to the amount of light measured, (b) means responsive to said signal to determine the quantity of each component of transmitted light present and (c) means responsive to (b) for controlling each of the light-attenuation means.
A particularly preferred and useful embodiment involves a multiplicity of such devices arranged such that the portion of a common design imaged by each device is in registration at a common plane, with every other portion of the design imaged by the other devices.
REFERENCES:
patent: 3805065 (1974-04-01), Williams
patent: 3876878 (1975-04-01), Frank et al.
patent: 3924121 (1975-12-01), Barbieri
E. I. Du Pont de Nemours and Company
Nelms David C.
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