Patent ID: 7885571

Claim:
An image forming apparatus, comprising: an image forming mechanism configured to form a toner image on a recording medium with a toner according to image data; a fixing unit configured to fix the toner image on the recording medium and including, a first heating member configured to face a front side of the recording medium bearing the toner image to apply heat to the recording medium, a second heating member configured to face a back side of the recording medium not bearing the toner image to apply heat to the recording medium, and a first heater provided inside the second heating member and configured to heat the second heating member; an auxiliary power source configured to drive the first heater; and a main power source configured to supply power, the fixing unit further including a second heater configured to heat the second heating member, and wherein the auxiliary power source drives the first heater when the fixing unit is warmed up and the main power source drives the second heater when the fixing unit is in a standby mode, and the fixing unit further includes a magnetic flux generator configured to heat the first heating member by induction heating, and wherein the main power source supplies power to the magnetic flux generator and the auxiliary power source supplies power to the first heater in accordance with a following inequality: WA<WI+WC where WA represents a maximum amount of power supplied by the main power source to the fixing unit, WI represents a maximum amount of power supplied by the main power source to the magnetic flux generator, and WC represents an amount of power supplied by the auxiliary power source to the first heater.