Photocopying – Projection printing and copying cameras – Multicolor picture
Patent
1974-09-24
1976-04-13
Wintercorn, Richard A.
Photocopying
Projection printing and copying cameras
Multicolor picture
355 77, G03B 2754, G03B 2776, G03B 2732
Patent
active
039500934
ABSTRACT:
A light source of adjustable colour is provided, primarily for use in apparatus for printing coloured originals. The invention is primarily useful in printing photographs.
According to one aspect of the invention there is provided a light source of adjustable colour, comprising three light emitters of seperately adjustable intensity, a light mixer adapted to mix light emitted by the emitters into one beam, and filtering means whereby the first emitter emits light containing one additive primary colour, the second emitter emits light containing the same colour and one other additive primary colour, and the third emitter emits light of all three additive primary colours.
The colour emitted by all the emitters, and therefore most easily adjustable to be richest in the final light beam, is, when the light is used for printing photographs, that colour which takes longest to develop.
REFERENCES:
patent: 2553285 (1951-05-01), Thomas
patent: 2985062 (1961-05-01), Clapp
patent: 3222985 (1965-12-01), Remesat
patent: 3345509 (1967-10-01), Dauser
patent: 3684371 (1972-08-01), Weisglass et al.
patent: 3760174 (1973-09-01), Boenning et al.
patent: 3825336 (1974-07-01), Reynolds
Gretag Aktiengesellschaft
Wintercorn Richard A.
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