HEATER, IMAGE HEATING DEVICE, AND IMAGE FORMING APPARATUS

To prevent uneven heating in a longitudinal direction, and at the same time ensure sufficient allowance for heater crack.SOLUTION: A heater is used for an image heating device and comprises: a substrate; a first heat element and a second heat element that are provided on the substrate along the longitudinal direction of the substrate and parallel to each other, and generate heat with power supplied from a power supply; first to third electric contact units for electrically connecting to the power supply; a first conductive unit that electrically connects the first electric contact unit to one end in a short direction being a direction orthogonal to the longitudinal direction of the first heat element; a second conductive unit that electrically connects the second electric contact unit to one end in the short direction of the second heat element; and a third conductive unit that electrically connects the third electric contact unit to the other end in the short direction of the first heat element and the third electric contact unit to the other end in the short direction of the second heat element. The first electric contact unit, the second electric contact unit, and the third electric contact unit are provided near one end in the longitudinal direction of the substrate, near the other end in the longitudinal direction of the substrate, and near the center in the longitudinal direction of the substrate, respectively.SELECTED DRAWING: Figure 2 【課題】長手方向の発熱ムラを抑え、同時にヒータ割れに対する十分な許容度を確保する。【解決手段】像加熱装置に用いるヒータであって、基板と、基板の長手方向に沿って平行に基板に設けられ、電源から供給される電力で発熱する第１の発熱抵抗体と第２の発熱抵抗体と、電源に電気的に接続するための第１〜３電気接点部と、第１電気接点部と第１の発熱抵抗体の長手方向と直交する方向である短手方向一端を電気的に接続する第１の導電部と、第２電気接点部と第２の発熱抵抗体の短手方向他端とを電気的に接続する第２の導電部と、第３電気接点部と第１の発熱抵抗体の短手方向他端、第３電気接点部と第２の発熱抵抗体の短手方向一端を電気的に接続する第３の導電部と、を有し、第１電気接点部が基板の長手方向一端付近、第２電気接点部が基板の長手方向他端付近、第３電気接点部が基板の長手方向中央付近に、それぞれ設けられている。【選択図】図２