FIXATION DEVICE

PROBLEM TO BE SOLVED: To provide a fixation device which does not cause either abrasion of the inner surface of a fixation belt due to temperature drop at a non-paper-passing part or torque increase of the fixation belt due to abrasion powder, while minimizing the power consumption at the non-paper-passing part.SOLUTION: A fixation device includes first temperature detection means 19 for detecting the temperature of a heater in a passing area of a recording material having a minimum width; second temperature detection means 18 for detecting the temperature of the heater in an end portion of a heating area of a resistance heating element in the longitudinal direction; and control means for controlling the voltage applied from a power supply part to the heater. The control means applies a voltage to electrodes 405a and 405b for causing a longitudinally whole area of the resistance heating element to generate heat when the detection temperature of the second temperature detection means 18 is less than a first temperature, and applies a voltage to an electrode 405c, 405d, 405e, 405f, or the like, set according to the width size information of a recording material when the detection temperature of the second temperature detection means 18 is a second temperature or higher. 【課題】非通紙部で消費される電力の最小化を図りつつも、非通紙部の温度降下に起因する定着ベルト内面の磨耗および該磨耗粉によって発生する定着ベルトのトルクアップが発生しない定着装置を提供する。【解決手段】最小幅の記録材の通過領域の加熱体の温度を検知する第１の温度検知手段１９と、長手方向において抵抗発熱体の発熱領域の端部における加熱体の温度を検知する第２の温度検知手段１８と、電源供給部から加熱体へ印加する電圧を制御する制御手段を有し、制御手段は第２の温度検知手段１８の検知温度が第１の温度未満の場合は、抵抗発熱体の長手全域が発熱可能な電極４０５ａ，ｂに電圧を印加し、第２の温度検知手段１８の検知温度が第２の温度以上の場合は、記録材の幅サイズ情報に応じて定められる電極４０５ｃ、ｄ、ｅ，ｆ等に電圧を印加する。【選択図】図１