Patent ID: 7599636

Claim:
A fixing apparatus comprising: a first heating member and a second heating member; and a current control unit which controls a number of waves thereby controlling a first AC current to be supplied to the first heating member and a second AC current to be supplied to the second heating member by a unit of predetermined number of half-waves; wherein the current control unit controls each of the first AC current and the second AC current in a positive-negative symmetrical pattern by the unit of predetermined number of half waves; and regardless of a duty ratio level of the first heating member and the second heating member, for each instance the duty ratio changes, when the current control unit controls the number of waves by the unit of predetermined number of half-waves so that the second AC current is larger than the first AC current at a first duty ratio level, the current control unit controls the number of waves by the unit of predetermined number of half-waves so that the first AC current is larger than the second AC current at a second duty ratio level when the first AC current next differs from the second AC current.