Patent ID: 8620173

Claim:
An image forming device that heats and fuses a developer transferred to a surface of a recording medium based on inputted print data, comprising: a heat source; a fusion member that is supported in a freely rotatable manner and that is heated by the heat source; a pressure application member that is positioned to face the fusion member and that presses against the fusion member; a temperature detection device that is positioned to face the pressure application member and that detects a surface temperature of the pressure application member; and a temperature control part that controls a heating temperature by the heat source based on a detection result by the temperature detection device, wherein the temperature control part determines whether or not the temperature detected by the temperature detection device is greater than a predetermined temperature, performs temperature control on the heat source by selecting, as a target temperature, one of a preset first set temperature or a second set temperature that is lower than the first set temperature, and sets, as the target temperature, the one of the first set temperature and the second set temperature based on whether print data is inputted within predetermined time elapsed from initiating heating by the heat source.