Patent ID: 8095029
Filing Date: 2012-01-10
Classification: G03G

Abstract:
1. An image forming apparatus comprising: a heating-type fixing device; a first sensor disposed in a state not in contact with said fixing device, for detecting a temperature of said fixing device; a second sensor for detecting an ambient temperature of said first sensor; and a controller for controlling a surface temperature of said fixing device, such that the surface temperature of said fixing device becomes equal to a target temperature based on outputs from said first sensor and from said second sensor, wherein said controller, based on whether the target temperature is higher or lower than a current surface temperature of said fixing device, differentiates methods for computing a subsequent surface temperature of said fixing device as part of the controlling of the surface temperature to become equal to the target temperature, wherein when the target temperature is higher than the current surface temperature of said fixing device, said controller computes the subsequent surface temperature of said fixing device in accordance with a difference between maximum output from said second sensor when said fixing device stabilizes at the target temperature and an initial output from said second sensor measured when the temperature control of said controller is started.