Patent ID: 8995859
Filing Date: 2015-03-31
Classification: G03G

Abstract:
1. An image forming apparatus comprising: a fixing portion configured to fix an unfixed image formed on a recording material thereon, said fixing portion including, a controller configured to effect control comprising a plurality of control cycles to control electric power to be supplied to said first heat generating element and said second heat generating element, said controller controlling said first heat generating element and said second heat generating element independently from each other, wherein said plurality of control cycles each include a plurality of continuous half waves of AC waveforms in which control patterns are set for respective control cycles, wherein start and end points of each control cycle are zero-cross points of the AC waveform, wherein a number of continuous half waves of AC waveforms in a control cycle for said first heat generating element and a number of continuous half waves of AC waveforms in a control cycle for said second heat generating element are the same, wherein said image forming apparatus is configured to set a plurality of feeding speeds of the recording material, and said controller changes a difference between a phase of the control cycle for said first heat generating element when said first heat generating element is supplied with the electric power and a phase of the control cycle for said second heat generating element when said second heat generating element is supplied with the electric power, wherein the difference is an integer multiple of a half wave of AC waveforms, and wherein the integer multiple depends on the distance between the first and second heat generating elements.