Image fixing device, image forming apparatus providing the image fixing device and rotor used in the image fixing device and having induction coil inside

An image fixing device for fixing an image by applying heat to a recording material having an unfixed toner image impregnated therein, the device having a first rotor arranged in a pressed state, a second rotor and an induction coil either inside of the aforementioned second rotor or inside of the aforementioned first rotor or both the aforementioned first rotor and the aforementioned second rotor whereby an induction current is generated in a part of either the first rotor, the second rotor, or both the first and second rotors wherein a high frequency current is allowed to pass therethrough to generate heat;

• the device comprising:
• temperature detection means for detecting the temperature of a rotor having an induction coil inside;
• and
• control means for controlling a high frequency current which is allowed to pass through the induction coil depending on a first value, which is detected by the temperature detection means at a first time when the high frequency current is not output, and depending on a second value, which is detected by the temperature detection means and corrected at a second time when the high frequency current is output.