| 摘要 |
PURPOSE:To enable starting of a phase control angle from an adequate value and to converge quickly a voltage for lighting a lamp to a target value by controlling the phase control angle of the voltage for lighting the next first lamp from the phase control angle in the final stage of the previous scanning of the original. CONSTITUTION:A control device of a halogen lamp 2 is constituted of a power source 1, a rectifier circuit 5 for controlling the gate of a TRIAC3, a trigger element 6, a zero cross circuit A, a circuit B for detecting the operation and execution value of lighting a lamp 2 and a microcomputer 27, etc. The voltage for lighting the lamp 2 is controlled by a microcomputer 27. The phase control angle in the final time of exposure in which scanning is performed at every time in copying of plural sheets and the on-off condition of a fixing heater 30 are preliminarily stored with the microcomputer 27. The first phase control angle for the next original scanning is set from the stored phase control angle, the on-off condition of the heater 30 and the on-off condition of the heater 30 after scanning. |
