Light source for photographic color printers

Details Light source for photographic color printers Light source for photographic color printers

1992-05-26

1994-03-22

Hayes, Monroe H.

Photocopying

Projection printing and copying cameras

Multicolor picture

355 35, 355 38, 355 36, 355 70, 355 71, G03B 2754, G03B 2772

Patent

active

052968901

ABSTRACT:
A light source for use in exposing photographic material through a negative. The source includes a plurality of lamps, one appropriate to each emulsion layer of the material to be exposed. Each lamp has a reflector projecting a light stream through a dichroic filter which limits the energy of the stream so that it acts on a single layer. The separate streams are then combined into a single stream which is further treated to eliminate rays exceeding a predetermined angle. Cut off blades may be used to terminate the projection of any one or more of the individual streams for certain definite times depending on the desired exposure of each separate emulsion layer.

REFERENCES:
patent: 3488117 (1970-01-01), Weisglass
patent: 3492070 (1970-01-01), Zahn
patent: 3630609 (1971-12-01), Clapp et al.
patent: 3684371 (1972-08-01), Weisglass et al.
patent: 3873199 (1975-03-01), Weinert
patent: 4087176 (1978-05-01), Nigg
patent: 4143966 (1979-03-01), Gandini

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