Photocopying – Projection printing and copying cameras – Illumination systems or details
Patent
1996-04-15
1998-06-16
Metjahic, Safet
Photocopying
Projection printing and copying cameras
Illumination systems or details
355 38, G03B 2772
Patent
active
057679509
ABSTRACT:
An adjustable iris diaphragm assembly (26) in a zoom lens system (16) of a photographic printer (10) is calibrated for each magnification setting by progressively adjusting the aperture opening until a predetermined light intensity is detected by a sensor (36) near a paper plane of the printer and then determining an output voltage of a feedback sensor (88) of the iris diaphragm assembly. A correlation is established among magnification settings of the printer, iris stop settings, and sensor output voltages to enable the printer to accurately set the iris for a desired exposure.
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Hawver Jeffery Richard
O'Brien Michael Joseph
Rivers Andrea S.
Chizmar John
Eastman Kodak Company
Metjahic Safet
Snee, III Charles E.
Stewart Gordon M.
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