Exposure control apparatus

Details Exposure control apparatus Exposure control apparatus

1982-08-10

1983-09-06

Gellner, Michael L.

Photocopying

Projection printing and copying cameras

Illumination systems or details

G03B 2772

Patent

active

044025980

ABSTRACT:
Exposure control apparatus for use in a duplicating machine includes a light source powered with a high-frequency pulsed voltage to generate light, a sensor for sensing intensity of the light to produce a sensor output, and control circuitry for controlling the on/off timing of the pulsed voltage in response to the sensor output. At the time of initial turn-on of the lamp the power applied to such lamp is supplied at an increased rate to hasten the turn-on time.

REFERENCES:
patent: 3738242 (1973-06-01), Lee et al.
patent: 4018526 (1977-04-01), Schroter
patent: 4046475 (1977-09-01), Booth et al.
patent: 4124294 (1978-11-01), Nakamura

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