| 摘要 |
PROBLEM TO BE SOLVED: To provide a heating device having uniform and excellent fixing property and capable of preventing temperature rise at a paper non-passing part by eliminating the thermal asymmetry of the heating device with inexpensive and simple constitution, and an image forming apparatus. SOLUTION: In the heating device heating material to be heated by a heating body comprising a substrate, a resistance heating element formed on the substrate, and an electrode feeding power to the resistance heating element, a calorific value per unit area of the resistance heating element is changed at both ends in a longitudinal direction. Any one of means to change the width of the resistance heating element/to change the volume resistance value of the resistance heating element/to change the length of the resistance heating element (distance to the end of the resistance heating element from the end of the material to be heated in maximum width which can be conveyed in the heating device) is set as a means to change the calorific value per unit area between right and left. When changing the length of the resistance heating element, the end of the resistance heating element is provided on an outer side than the end of the material to be heated in the maximum width on one end side, and the end of the resistance heating element is provided an inner side than the end of the material to be heated in the maximum width on the other end side. COPYRIGHT: (C)2008,JPO&INPIT
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