Photocopying – Projection printing and copying cameras – With cathode ray tube for light source
Patent
1991-10-09
1993-01-26
Gellner, Michael L.
Photocopying
Projection printing and copying cameras
With cathode ray tube for light source
355 77, 355 38, G03B 2780
Patent
active
051825945
ABSTRACT:
A CRT apparatus for illuminating color photographic negatives to faithfully produce colored hard copies in photographic printers without the use of dark shutters, heat shields and/or moving color filters. The preferred embodiment of the present invention employs an ordinary color television with a R, G, B input, driven by a signal controller and a specially designed CRT. The controller previews and analyzes the negative with inputs from an ordinary color television camera illuminated by a standard light source. A sample of the recording media for the hard copy, which was exposed to a pattern generated by the controller and displayed on the CRT, acts as a standard reference for the controller's mathematical manipulations to analyze the hard copy media sample, and control the Kelvin temperature and luminance settings of the CRT when exposing the hard copy through the subject negative in order to achieve automatic color balance in the hard copy.
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Gellner Michael L.
Rutledge D.
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