| 摘要 |
PROBLEM TO BE SOLVED: To provide a highly reliable heating element in which a crack is not generated because an adhesive well matches with a substrate and/or a base material of a temperature sensor and peeling is not generated because initial adhesive strength is large enough, by regulating the most appropriate percentage content range of a filler, a fixing device using it and an image forming device. SOLUTION: A slender resistance heating element is adhered to an electrically insulated slender substrate along its longitudinal direction, a temperature sensor 5 mounted on a base material is connected to a conductive material pattern formed on the substrate at a position where heat from the resistance heating element can be sensed, and in addition, adhesive 9 in polyamide group having equivalent or higher thermal conductivity, smaller coefficient of thermal expansion, to the material used in the substrate 1 and/or the base material, or a filler containing the same material for 76±1 wt.%, is applied between the temperature sensor 5 and the substrate 1. If thermal conductivity of the adhesive approaches enough to the material used the substrate 1 and/or the base material, its coefficient of thermal expansion becomes equivalent to it, or a filler of the same material is used, a crack or peeling is not generated in the adhesive.
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