Photocopying – Projection printing and copying cameras – Multicolor picture
Patent
1991-03-15
1992-06-09
Hix, L. T.
Photocopying
Projection printing and copying cameras
Multicolor picture
355 77, G03B 2780
Patent
active
051211599
ABSTRACT:
A photographic printer has a light source for illuminating negative film. A filter turret is disposed rotatably across an optical path from the light source, and is rotated by a stepping motor. A scanner is provided for measuring light. The turret is stopped in a predetermined position other than a position which keeps the photometric opening in the turret fully open, in order to reduce a light amount passed through from the light source. Data for the predetermined stop position is stored in a memory. A controller controls rotation of the stepping motor by reading out the stop position in order to detect a position taken by a picture frame on negative film. The memory also stores three other predetermined stop positions to stop respective color filters in offset positions in order to reduce a light amount at the time of three color separation photometry. With the invention, a conventionally used ND filter can be omitted while detecting the picture frame and three color separation photometry. Another stop position allows reduction of a light amount when photometry is effected for conditioning the light source. A normal control negative film can be omitted while conditioning the light source so as to prevent operational error.
REFERENCES:
patent: 3000281 (1961-09-01), Rentschler
patent: 4935772 (1990-06-01), Wakui et al.
Fuji Photo Film Co. , Ltd.
Hix L. T,.
Rutledge D.
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