Additive tri-color lamphouse for a photographic printer

Details Additive tri-color lamphouse for a photographic printer Additive tri-color lamphouse for a photographic printer

1978-09-15

1980-02-12

Wintercorn, Richard A.

Photocopying

Projection printing and copying cameras

Multicolor picture

355 1, G03B 2754, G03B 2776

Patent

active

041881117

ABSTRACT:
An additive tri-color lamp house having three lamps for conveying filtered light into a mixing chamber and illuminating a photographic image contained on a photographic film. The illuminated image is then projected onto a photosensitive paper for the purpose of making photographic prints and copies. The lamp house is characterized by having a combination of additive primary color filters and subtractive primary color filters positioned in front of the lamps and the amount of each additive primary color (i.e. red, green and blue) conveyed through the filters is controlled. By the proper positioning of the color filters in front of the lamps, the time required for proper exposure of the three separate emulsion layers on conventional color print paper is approximately equal.

REFERENCES:
patent: 3217594 (1965-11-01), Simmon
patent: 3756718 (1973-09-01), Letzer
patent: 3825335 (1974-07-01), Reynolds
patent: 3825336 (1974-07-01), Reynolds
patent: 3923394 (1975-12-01), Frankiewicz
patent: 3950093 (1976-04-01), Schneider
patent: 4129372 (1978-12-01), Allgeier

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