Light source for photographic color printing

Details Light source for photographic color printing Light source for photographic color printing

1988-02-01

1989-03-21

Wintercorn, Richard A.

Photocopying

Projection printing and copying cameras

Multicolor picture

355 70, G03B 2754, G03B 2772

Patent

active

048148288

ABSTRACT:
A light source or lamphouse wherein light from lamps 16 of different colors, as obtained by filters 18, is projected into a full diffusing chamber 20 with diffusing reflective internal surfaces where the light is premixed. The diffusing chamber is disposed adjacent to a specular dispersing chamber 22 of greater volume than the diffusing chamber where the light is further mixed and dispersed to provide uniform illumination at an outlet; the use of both types of chambers providing efficient mixing in a limited volume so that the source can be movably mounted on the column of an enlarger or printer.

REFERENCES:
patent: 3492070 (1970-01-01), Zahn
patent: 3630609 (1971-12-01), Clapp
patent: 3684371 (1972-08-01), Weisglass et al.
patent: 3897147 (1975-07-01), Simon
patent: 3923394 (1975-12-01), Frankiewicz
patent: 3950893 (1976-04-01), Schneider
patent: 4124292 (1978-11-01), van Wandelen
patent: 4143966 (1979-03-01), Gandini
patent: 4255045 (1981-03-01), Eisenberg
patent: 4423953 (1984-01-01), Burnham
patent: 4565441 (1986-01-01), Evans
Hausmann & Slack, "Physics" (3rd Ed., 1948), pp. 635-637.

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