IMAGE HEATING DEVICE, IMAGE FORMING DEVICE, AND CONTROL METHOD FOR IMAGE HEATING DEVICE

To provide technology with which, in a structure for individually controlling the heating of a plurality of heating areas by a plurality of heat generators in a row in the longitudinal direction, it is possible to prevent the occurrence of poor fixing or gloss reduction in the vicinity of an image edge and obtain greater power-saving effects.SOLUTION: An image is formable area of a recording medium is divided in the longitudinal direction in correspondence to a plurality of heat generators into a boundary area including a boundary between one heat generator and a heat generator adjacent thereto out of the plurality of heat generators and overlapping the one heat generator and the adjacent heat generator in a prescribed range in the longitudinal direction and a non-boundary area overlapping the one heat generator in ranges other than the boundary area. The control target temperature of a heating area heated by the one heat generator is chosen to be a first temperature based on information out of image information that corresponds to the boundary area or a second temperature based on information out of image information that corresponds to the non-boundary area whichever is highest.SELECTED DRAWING: Figure 5 【課題】長手方向に並ぶ複数の発熱体によって複数の加熱領域を個別に加熱制御する構成において、画像端部近傍における定着不良や光沢低下が発生してしまうことを防ぎつつ、より一層の省電力効果を得ることのできる技術を提供する。【解決手段】記録材における画像を形成可能な領域を、複数の発熱体に対応して長手方向に区分けした領域であって、複数の発熱体のうちの一の発熱体とこれに隣接する発熱体との境界を含み、一の発熱体及び隣接する発熱体と長手方向に所定の範囲で重なる境界領域と、境界領域を除いた範囲において一の発熱体と重なる非境界領域と、に区分けし、一の発熱体により加熱する加熱領域の制御目標温度を、画像の情報のうち境界領域に対応する情報に基づいた第１温度と、画像の情報のうち非境界領域に対応する情報に基づいた第２温度と、のうち最も高い温度とする。【選択図】図５