Patent ID: 7551869

Claim:
A fixing device for fixing an image formed on a recording material, comprising: a fixing member disposed on a recording material conveyance path; a heating part configured to heat the fixing member to fix an image formed on the recording material by heat; a storage unit configured to be charged by an external power source to supply power to the heating part; a fixing temperature detecting unit configured to detect a temperature of the fixing member; and a control unit configured to control the storage unit so as not to supply power to the heating part at the time of warming-up when the temperature of the fixing member is less than a predetermined temperature before or at a start time of warming-up the fixing member by the heating part, and to supply power to the heating part at the time of warming-up when the temperature of the fixing member is greater than the predetermined temperature before or at the start time of warming-up the fixing member by the heating part.