| 摘要 |
A fixing device is provided with a heating member heated by a heater, a temperature detecting member for detecting a temperature of the heating member, a controller for controlling energization of the heater so that the temperature detected by the temperature detection member becomes equal to a predetermined fixing temperature in a fixing mode, and becomes equal to a predetermined stand-by temperature lower than the fixing temperature in a stand-by mode, and a measurement unit for measuring a temperature rise rate of the heater, wherein the controller controls determination of the stand-by temperature and a switching timing from the stand-by temperature to the fixing temperature on the basis of a measurement result from the measurement unit.
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