Patent ID: 8422901

Claim:
An image forming apparatus, comprising: an image forming mechanism configured to form a toner image on a recording sheet; and an image fixing unit configured to fix the toner image onto the recording sheet, the unit comprising: a magnetic flux generator configured to generate a magnetic flux; a heat member configured to be heated inductively by the magnetic flux generated by the magnetic flux generator; a magnetic flux adjuster having a lateral side edge with a plurality of steps and configured to reduce the magnetic flux active on the heat member to stepwise change a heat reduction area in a width direction of the heat member to reduce a heating area in a width direction of an outer circumferential surface of the heat member; and a controlling member configured to move the magnetic flux adjuster to cause one of the plurality of steps to be situated at a position to shield the magnetic flux, wherein the heat member includes a fixing member configured to melt the toner image, the fixing member includes a fixing belt, and the magnetic flux generator is arranged at a position to face the fixing belt.