Patent ID: 9348276
Filing Date: 2016-05-24
CPC Classification: G03G

Claim Text:
1. A fixing device comprising: a pressurizer constituted of a rotating body; a heater including a heat source, a fixing belt heated by the heat source, and a pressing portion disposed inside the fixing belt sandwiched between the pressing portion and the pressurizer disposed outside the fixing belt; a non-contact type temperature detector for measuring a surface temperature of the fixing belt; a displacement detector for detecting a displacement of a measurement target position of the fixing belt with respect to the temperature detector; and a controller configured to adjust an amount of heat generation of the heat source on the basis of the temperature detected by the temperature detector and the displacement detected by the displacement detector, so as to perform temperature adjustment of the surface temperature of the fixing belt, wherein: a distance between the temperature detector and the measurement target position in a normal state with no displacement of the fixing belt is regarded as a reference distance, while a surface temperature of the fixing belt when performing the temperature adjustment at the reference distance is regarded as a reference temperature, and when the controller detects that the distance between the temperature detector and the measurement target position is shorter than the reference distance on the basis of the displacement detected by the displacement detector, the controller controls the temperature of the fixing belt to be higher than the reference temperature in the temperature control of the fixing belt based on the temperature detected by the temperature detector.