Photographic exposure apparatus

Details Photographic exposure apparatus Photographic exposure apparatus

1990-10-02

1991-06-04

Wintercorn, Richard A.

Photocopying

Projection printing and copying cameras

Illumination systems or details

355 83, G03B 2772, G03B 2780

Patent

active

050218239

ABSTRACT:
A photographic exposure apparatus includes a lamp housing for a metal-halide discharge lamp for exposing a light-sensitive film to an image-bearing sheet when the lamp is energized to full power, a shutter for closing the lamp housing while the lamp remains energized at a lower power level in stand-by condition, and a control unit for energizing of the lamp in standby condition in such a way that, while being maintained at reduced power, the lamp is intermittently energized at high power during short intervals, e.g. in pulses, to thereby substantially prolong the working life of the lamp.

REFERENCES:
patent: 3764210 (1973-10-01), Nakamura
patent: 4933607 (1990-06-01), Vogel

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