Patent ID: 7471911

Claim:
A fixing apparatus provided with a roller for fixing and a plurality of heat sources that heat a surface of the roller, in which a surface temperature of the roller is detected and controlled at a prescribed temperature while a sheet of recording paper is subjected to pressure and heat by the roller to fix a developer onto the sheet of recording paper, comprising: a plurality of temperature detection means for detecting the surface temperature of the roller, wherein the heat sources include a first heat source that heats a central area in a lengthwise direction of the roller and a second heat source that heats both sides of the central area of the roller; wherein at least one of the temperature detection means is arranged in a first position of the roller that does not overlap any of the heat sources when viewed from a peripheral surface side of the roller; wherein at least one of the temperature detection means is arranged in a second position away from a region of the roller to be controlled at the prescribed temperature, and wherein the fixing device further comprises control means for controlling the second heat source by performing correction on a temperature detected by the temperature detection means arranged in the second position, determining a temperature of a region of the roller to be controlled to the prescribed temperature, and controlling the second heat source based on the temperature determined by the correction.