| 摘要 |
PROBLEM TO BE SOLVED: To provide fixing device/method for reducing a temperature ripple at the time of controlling a fixing temperature to a setting temperature and preventing the overshoot of the fixing temperature when the device is started at the time of thermally fixing a non-fixed toner image on recording paper and to provide a temperature control circuit used for the control of the temperature in the fixing device. SOLUTION: In the fixing method, non-fixed developer carried by a recording medium thermally fixed by raising the temperature of a fixing means to a target temperature and the output ratio of power supplied to a heater 11a is changed until the fixing temperature becomes close to the target temperature. The output ratio is reduced as the temperature becomes close to the target temperature. The temperature of the fixing means is detected and a phase control circuit 55 phase-controls AC voltage supplied to the heater based on the detection signal, Thus, the output ratio is changed based on the detection temperature, power is supplied to the heater and the temperature is controlled.
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