Exposure control apparatus

摘要

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.