| 摘要 |
PURPOSE:To attain excellent responsiveness to the variance in temperature of a heater wire to control the temperature with high precision by providing a heating plate brought into close contact with the inside peripheral surface of a photosensitive drum and directly detecting the temperature of the heater wire arranged on the inside peripheral surface of this heating plate and changing the calorific value. CONSTITUTION:For example, a stainless parallelogrammic heating plate 81 and one heater wire 82 meandered and adhered to the heating plate 81 are provided. A thermistor 83 as a thermometer which detects the temperature of the heater wire 82 itself is arranged on the heating plate 81 so that the thermistor 83 is brought into contact with a part of the heater wire 82, and the thermistor 83 and the part of the heater wire 82 brought into contact with the thermistor 83 are coated with a synthetic resin 84 like silicone. The output of the thermistor 83 is given to a voltage control circuit 85 which controls the voltage applied to the heater wire 82. The voltage control circuit 85 controls the voltage applied to the heater wire 83 based on the temperature of the heater wire 83 detected by the thermistor 83. |
