Apparatus for the determination of the color composition of the

Details Apparatus for the determination of the color composition of the Apparatus for the determination of the color composition of the

1977-09-02

1980-02-12

Evans, F. L.

Optics: measuring and testing

By shade or color

Photography

355 38, G01J 350

Patent

active

041881257

ABSTRACT:
An apparatus for determining the color composition of the printing light of a photographic enlarger samples and measures the light within the intermediate diaphragm chamber of the objective lens. The light is sampled by inserting color-sensitized photoelectric transducers within the intermediate diaphragm chamber or inserting a light conducting means within the chamber between exposures for sampling and conducting the light outside of the chamber to external photoelectric transducer means, which determines the color content in any operative manner. The light conductor may be mounted on a slide together with an adjustable diaphragm for alternating inserting in the path of the printing light or the light conductor and a number of apertures of different cross-sections may be mounted on a rotary disk for optional insertion along the optical axis. The light conducting means includes a diffusing element within a light conducting and reflecting chamber. A removable diffusing element is also mounted in line with the adjustable diaphragm on the slide.

REFERENCES:
patent: 3114283 (1963-12-01), Gruner
patent: 3245309 (1966-04-01), Wick et al.
patent: 3640620 (1972-02-01), Shatz et al.
patent: 3649118 (1972-03-01), Vano et al.
patent: 3685901 (1972-08-01), Crete

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