| 摘要 |
PURPOSE:To obtain inveriably constant fixation effect by providing a correcting element to an infrared temperature sensor and holding the output of the temperature sensor above a proper correction level, and controlling the temperature of a heat roll. CONSTITUTION:Radiant heat from the heat roll 2 is made incident to the housing 9 and sensing part 10 of the infrared temperature sensor 8 and the output of the sensor 8 based upon their fine temperature difference is outputted to the side of a test point A through an inverting amplifier 13 and then inputted to an inverting amplifier 15 through a veriable resistance RV1. The output of an inverting amplifier 14 having the correcting element (diode) 12 is supplied to the inverting amplifier 15 through a variable resistor RV3 to correct output variation at the point A. The output of the amplifier 15 is supplied to a heater temperature control circuit through an inverting amplifier 16 and the temperature of the heat roll 2 right after its warm-up is set a little bit higher to lower the temperature according to a rise in the ambient temperature of the roll 2. Consequently, the constant fixation effect is obtained. |
