| 摘要 |
PROBLEM TO BE SOLVED: To provide an image forming device made possible to use in a wide power source voltage range. SOLUTION: On performing power conduction to a heater in a fixing device of a film heating system by wave number control of for instance, the power conduction ratio 50%, the power source voltage is estimated based on the temp. rising ratio at this time. Next, frequency control pattern is selected so as to correspond to the different power source voltage for instance, at 100% when input voltage is 100V, 87.5% when 115V, 45% when 220V, 42.5% when 24V, while under such frequency control pattern, the temp. control of the heater is performed by controlling the electric power by the phase control. |
