Fixing device and image forming apparatus including same

A fixing device comprising:

• a fixing rotary body;
• an opposed member opposing the fixing rotary body to form a nipping portion between the opposed member and the fixing rotary body;
• a heater to heat the fixing rotary body, the heater including plural heat generators arranged in a width direction of a recording medium fed to the nipping portion;
• and
• a heating controller to separately control outputs of the heat generators,
• wherein, when the recording medium fed to the nipping portion has an image area and a non-image area, the heating controller controls the outputs of the heat generators based on image information so that a first heat generator of the heat generators corresponding to the image area is higher in temperature and a second heat generator of the heat generators corresponding to the non-image area is lower in temperature, and
• wherein, based on information other than the image information, the heating controller temporarily shifts an area of the fixing rotary body corresponding to the non-image area to a temperature differing from a normal temperature.