| 摘要 |
PROBLEM TO BE SOLVED: To stably heat a member at low cost with hardly causing ripple without necessitating a special applied bias controller for a heater by using a PTC (Positive Temperature Coefficient) resistance element in a heating device. SOLUTION: A drum heater 13 functioning as the heating device using a planar PTC resistance element is put inside a photoreceptor drum 1, and a terminal for applied bias is connected to a flange on a rear end side. A temperature sensor 17 functioning as an environment sensor or a temperature sensor is arranged near the outside of the drum 1 so as to detect the surface temperature of the drum 1. A contact attached to an image forming device main body abuts on the electrode part of the flange on the rear end side and slides according to the rotation of the drum 1, by which power is fed to the heater 13 using the PTC resistance element. In such a case, the material of the PTC element is adjusted to be kept constant at 40 deg.C, for example.
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