Control device and image forming apparatus

An image forming apparatus comprising:

• a fixing device configured to fix, by heat, an image formed on a medium conveyed along a conveyance path, the fixing device including:
• a plurality of heaters arranged along a first direction crossing the conveyance path, wherein the heaters include first and second heaters, wherein when the medium is conveyed, the first heater overlaps the medium and the second heater does not overlap the medium when viewed in a second direction crossing the conveyance path and the first direction, and
• a temperature sensor;
• and
• a control circuit configured to:
• determine an estimated temperature of each of the first and second heaters based on an amount of power supplied to said each of the first and second heaters,
• determine a corrected temperature of the first heater based on the estimated temperature of the first heater and a temperature measured by the temperature sensor,
• determine a corrected temperature of the second heater based on the estimated temperature of the second heater, the corrected temperature of the first heater, and the estimated temperature of the first heater,
• generate energizing pulses for energizing the first and second heaters based on the corrected temperatures of the first and second heaters, and
• issue a command for controlling a conveying speed of the medium based on the corrected temperature of the second heater.