Patent ID: 7254352

Claim:
A temperature control method for use in a fusing device of image forming apparatus having a fusing roller and a heater heating the fusing roller, comprising: sensing a surface temperature T of the fusing roller at one of when the image forming apparatus is turned on, when the image forming apparatus begins a normal operation from a power saving operation, and when a cover of the image forming apparatus is closed after being opened; comparing the sensed surface temperature T of the fusing roller with a set temperature; driving the heater until the surface temperature T reaches a first target temperature Tt 1 when the sensed surface temperature T is below the set temperature; and driving the heater until the surface temperature T reaches a second target temperature Tt 2 when the sensed surface temperature T is over the set temperature, wherein the first target temperature Tt1 is one of a temperature Tv so that the surface temperature T of the fusing roller is increasable to the third target temperature Tt3 when the heater is turned off after heating the surface temperature T of the fusing roller to the first target temperature Tt1, and a temperature higher than the temperature Tv.