Patent ID: 7676168

Claim:
A fixing device for a color image forming apparatus, comprising: a first roller having a conductive heat generating layer; an induction current generating member that causes the heat generating layer to induce an induction current; a second roller that transports a fixed medium bearing a toner image in a certain direction by pinching the fixed medium together with the first roller; a heating source that heats the second roller; and a control unit configured to control the induction current generating member to apply proper supply power in a color mode and a monochromatic mode, to control the heating source to stay ON in a color mode case, to control the heating source to stay OFF when a temperature of the first roller is a prescribed first temperature or higher and a temperature of the second roller is a prescribed second temperature or higher in the monochromatic mode, to control the heating source to stay ON when the temperature of the second roller is lower than the prescribed second temperature in the monochromatic mode.