| 摘要 |
PROBLEM TO BE SOLVED: To enhance the stability of the temperature control of a fixing roller at a part where recording paper passes by enhancing heating efficiency and efficiently performing heating in accordance with the width of the recoding paper. SOLUTION: This induction thermal fixing device is equipped with the fixing roller 1, a pressure roller 2, a coil 3 performing induction heating by giving AC magnetic field to the roller 1, a temperature detection means 8 detecting the temperature of the roller 1, and a control means controlling the temperature of the roller 1 by applying an AC current to the coil 3 and controlling the AC current based on the detected temperature. In the fixing device, the coil 3 is arranged in a state where it is divided into plural coils in the shaft direction of the roller 1 and the connection of plural coils is set to connection in a forward direction and connection in an alternate direction so that the heating efficiency by its magnetic coupling with the roller 1 may be maximal, and further the control means controls the current applied to plural coils in accordance with the width of the recording paper. The roller 1 is quickly heated by the induction heating and a printing time after supplying power is shortened.
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