Patent ID: 11880150
Assignee: SHARP KABUSHIKI KAISHA
Field: Optics (Instruments)
Classification: CPC G | IPC G

Claim 0:
1. A fixing device comprising:
a fixing member and a pressure member disposed in a rotatable manner;
a heat source that heats the fixing member; and
a controller that controls AC power supplied to the heat source, wherein,
the fixing device fixes an unfixed image on a sheet held and conveyed between the fixing member and the pressure member, and
the controller causes a current to flow including current-carrying waveforms having different phase angles in half-wave units during preset control cycles, and changes, in steps, the phase angles in half-waves immediately before a joint between control cycles, among the preset control cycles, that are adjacent to each other when a difference in effective voltages of adjacent current-carrying waveforms at the joint exceeds a threshold.