Patent ID: 7109441

Claim:
A self-temperature-controlling type heat plate for fixation comprising: a metallic base plate; and a heating resistor arranged on a reverse face of the metallic base plate, the heating resistor being formed by laminating, at least, a heat transmission strengthening layer, heating resistor layer for controlling temperature, heat transmission strengthening layer, heating resistor layer, heat insulation strengthening layer, heat reflecting layer and protective layer in this order on the metallic base plate, wherein the heating resistor layer for controlling temperature is made of a resistor material having a negative temperature coefficient, and when the heating resistor layer is energized and heated by a constant current power source, a low temperature section is heated by high electric power because of its high resistance, and a high temperature section is heated by low electric power because of its low the resistance, so that a surface temperature obtained by the heating resistor layer is compensated by the thus generated heat and a local temperature distribution of the heat plate can be automatically controlled in a moment to be uniform.