Photographic printing apparatus

Details Photographic printing apparatus Photographic printing apparatus

1996-05-17

1998-06-16

Moses, R. L.

Photocopying

Projection printing and copying cameras

Illumination systems or details

355 67, G03B 2754, G03B 2772

Patent

active

057679517

ABSTRACT:
A photographic printing apparatus includes a light source for exposure, an optical unit for projecting an image carried on a negative film onto a photosensitive material at a predetermined magnification, a first shutter for exposure time control disposed between the light source and the negative film, and a second shutter for light shielding disposed between the optical unit and the photosensitive material. The first and second shutters are controlled such that their opening operations end simultaneously and their closing operations start simultaneously. Alternatively, the first and second shutters are controlled such that the second shutter is closed when the first shutter continues its closed state for 60 seconds or longer.

REFERENCES:
patent: 5430523 (1995-07-01), Tanibata
patent: 5488450 (1996-01-01), Tanibata

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