Image forming apparatus and image forming method

A fixing apparatus including a heating portion for heat fixing an unfixed developer borne on a recording material, comprising:

• a first heating member and a second heating member provided in the heating portion;
• and
• a current control unit which controls an AC current to be supplied to the heating portion;
• wherein the current control unit executes a control, on the AC current supplied to the heating portion, in a unit of N half-waves in such a manner that:
• an AC current to the first heating member is supplied in a positive-negative symmetrical pattern in the unit of N half-waves;
• an AC current to the second heating member is supplied in a positive-negative symmetrical pattern in the unit of N half-waves;
• and
• AC currents to the first and second heating members are supplied in a positive-negative symmetrical pattern in total in the unit of N half-waves.

A control method for a fixing apparatus including a heating portion having a first heating member and a second member for heat fixing an unfixed developer borne on a recording material, and a current control unit which executes a wave number control of an AC current supplied to the heating portion in a unit of N half-waves, the method comprising:

• a step of controlling an AC current supplied to the first heating member in a positive-negative symmetrical pattern;
• a step of controlling an AC current supplied to the second heating member in a positive-negative symmetrical pattern;
• and
• a step of controlling AC currents to the first and second heating members in a positive-negative symmetrical pattern in total in the unit of N half-waves.