| 摘要 |
To reduce a load of lighting control and control the temperature of a fixing roller to be kept uniform. When a warm-up operation is started by power-on of an image forming apparatus (S10), a control unit set a series lighting mode (S11) . After lapse of a predetermined period of time, the control unit switches the lighting mode to a parallel lighting mode (S12). After that, when the measured temperature of end portions of a heating roller is equal to or lower than a reference temperature, the control unit sets the lighting mode to an end heat up mode (S16), and subjects an end heater to full-lighting control and subjects a flat heater to lighting control in a duty pattern at a duty ratio between 33. 33% and 80% (S17). Meanwhile, when the measured temperature of the end portions of the heating roller exceeds the reference temperature, the control unit sets the lighting mode to a flat mode (S18), and subjects the flat heater to full-lighting control and subjects the end heater to lighting control in a duty pattern at a duty ratio between 33.33% and 80% (S19). |
