Patent ID: 8358947

Claim:
A fixing device comprising: a fixing unit, having a sheet portion and an inter-sheet portion, for heating and fixing a toner image onto each of sheets by rotationally bringing said sheet portion into contact with each said sheet; a heating unit for heating said fixing unit; a sensing unit for sensing a temperature of said fixing unit; and a control unit for controlling a temperature of said heating unit by changing a duty ratio of on/off of said heating unit based on a sensing output of said sensing unit, wherein said control unit includes a storage unit for storing an adjustment value of said duty ratio corresponding to at least one of said sheet portion and said inter-sheet portion, and said control unit i) determines whether said sensing unit is sensing the temperature of said sheet portion or the temperature of said inter-sheet portion in a rotation cycle, and ii) controls the temperature of said heating unit by using said adjustment value stored in said storage unit corresponding to said sheet portion or said inter-sheet portion depending on a determination result.