Patent ID: 7242880

Claim:
A fixing apparatus comprising: a heat roller which supplies heat to a sheet; a pressure roller which comes into contact with the heat roller; a heating apparatus having a plurality of heating members which heat the heat roller; a first non-contact temperature detecting section which is provided in non-contact with a surface of the heat roller, and which detects a surface temperature of the heat roller in the vicinity of the heating apparatus; a second non-contact temperature detecting section which is provided in non-contact with the surfaces of the heat roller and the pressure roller, and which detects a surface temperature of at least one of the heat roller and the pressure roller; a counter section for counting; and a control section which is connected to the counter section, compares a difference between a first temperature detected by the first non-contact temperature detecting section and a second temperature detected by the second non-contact temperature detecting section with a predetermined specified temperature difference, and continuously counts, by the counter section, a case in which the difference between the first temperature and the second temperature is greater than the specified temperature difference by a predetermined number of times, thereby detecting a predetermined period, and when the difference between the first temperature and the second temperature is greater than the specified temperature difference for the predetermined period or longer, stops heating of the heat roller by the heating apparatus.