FIXING APPARATUS

摘要

A fixing apparatus includes a tubular rotation member including a conductive layer, a helical coil, a resonance circuit, including a resonance capacitor, formed with the rotation member and the coil, a resonance inverter configured to control the resonance circuit, and a control unit configured to control electric power supplied to the resonance inverter, wherein the conductive layer generates heat with electromagnetic induction caused by magnetic flux generated through the coil, wherein the control unit sets a driving frequency of the resonance inverter according to at least one of a size of the recording medium and a temperature of a non-sheet-passing portion of the rotation member, and wherein the control unit changes a resonance frequency of the resonance circuit according to the set driving frequency.

主权项

1. A fixing apparatus configured to fix an image on a recording medium, comprising:
a tubular rotation member including a conductive layer; a helical coil disposed inside the rotation member, the coil having a helical axis in a direction along a generatrix direction of the rotation member; a resonance circuit, including a resonance capacitor, formed with the rotation member and the coil; a resonance inverter configured to control the resonance circuit; and a control unit configured to control electric power supplied to the resonance inverter, wherein the conductive layer generates heat with electromagnetic induction caused by magnetic flux generated through the coil, and the image formed on the recording medium is fixed on the recording medium with heat of the rotation member, wherein the control unit sets a driving frequency of the resonance inverter according to at least one of a size of the recording medium and a temperature of a non-sheet-passing portion of the rotation member, and wherein the control unit changes a resonance frequency of the resonance circuit according to the set driving frequency.