HEATING DEVICE, FIXING DEVICE, AND IMAGE FORMING APPARATUS

PROBLEM TO BE SOLVED: To suppress a variation in temperature distribution in the circumferential direction of a heating element that is in contact with the inner peripheral surface of an annular belt.SOLUTION: A heating device includes: an annular belt; a magnetic field generating part that is arranged on the outside of the belt to generate a magnetic field; a heating element that is arranged opposite to the magnetic field generating part across the belt, generates heat by electromagnetic induction of the magnetic field, and is in contact with the inner peripheral surface of the belt; a separation mechanism that separates, with one end in the circumferential direction of the heating element as the fulcrum, the other end in the circumferential direction from the inner peripheral surface of the belt to the axial center of the belt; and a movement mechanism that moves a portion of the magnetic field generating part corresponding to the other end in the circumferential direction of the heating element to the other end in the circumferential direction in association with the operation to separate the heating element by the separation mechanism. 【課題】環状のベルトの内周面に接触する発熱体の周方向における温度分布のバラつきを抑制する。【解決手段】加熱装置は、環状のベルトと、前記ベルトの外側に配置され、磁場を発生する磁場発生部と、前記ベルトを挟んで前記磁場発生部に対向配置され、前記磁場の電磁誘導により発熱し、前記ベルトの内周面に接触する発熱体と、前記発熱体の周方向一端側を支点に周方向他端側を前記ベルトの内周面から前記ベルトの軸中心側へ離間させる離間機構と、前記離間機構による前記発熱体の離間動作に伴って、前記磁場発生部における前記発熱体の前記周方向他端側に対向する部分を該周方向他端側に向けて移動させる移動機構と、を備える。【選択図】図３