| 摘要 |
A control apparatus for a copying machine or the like, has a halogen lamp for exposing an original, a detection circuit for monitoring a turn-on voltage of the lamp, a comparator for comparing the monitored turn-on voltage with a reference value, a microcomputer having an internal timer, and a memory for storing a phase control amount for a previous exposure operation. The light amount of the halogen lamp can be converged to a target value within a predetermined period of time and without adverse influence of turn ON/OFF operations of other loads such as a motor.
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