FIXING DEVICE AND ELECTROPHOTOGRAPHIC DEVICE

PROBLEM TO BE SOLVED: To reduce a flicker component by supplying power to a heater by the zero cross turning-on of inconsecutive driving pattern in accordance with a heater-on signal, and supplying a rated power by AC consecutive turning-on after a specified time. SOLUTION: A pulse generator 107 for discontinuous driving receives a zero cross pulse from a zero cross detecting circuit 105 detecting the timing of the zero cross of the voltage of a power source 1 and outputs only the zero cross pulse for the discontinuous driving of a specified pattern. A continuous/ discontinuous driving signal generating circuit 108 receives the on-signal of the heater 104 of a fixing device 100, generates a driving signal switching the continuous/discontinuous driving at the specified timing, and a selector 109 receives the driving signal so as to generate a pulse for driving an optical thyristor 102. The power is supplied on the heater 104 by the zero cross turning-on of the discontinuous driving pattern in accordance with the heater-on signal from an outside, and the rated power is supplied on the heater 104 by the AC continuous turning-in after the specified time.