Patent ID: 8238774

Claim:
An image forming apparatus having a first image forming mode and a second image forming mode, the apparatus comprising: a scanner which scans an image of an original; an image forming device which forms the image based on the scanned image; and a fixing device which fixes the image formed on the sheet to the sheet by heating, the fixing device including: a fixing member; a center coil for induction-heating a substantially central part of the fixing member; a side coil which is arranged at least one side of the center coil and adapted for induction-heating an end part of the fixing member; an induction heating power source which supplies a high-frequency pulse voltage to the center coil and the side coil; and a power control circuit which variably controls output power of the induction heating power source so that the output power increases or decreases on a predetermined cycle, and controls to set the maximum power supply of the induction heating power source at the second image forming mode smaller than the maximum power supply in the first image forming mode.