| 摘要 |
A belt fixing device including a fixing roller, a heating roller, an endless fixing belt spanned around the fixing roller and the heating roller and a pressing roller disposed opposing the fixing roller via the fixing belt, a heater disposed at least in the inside of the heating roller for heating the fixing belt, a heating area where the fixing belt is heated by the heating roller, a fixing area including a first fixing part where the pressing roller contacts the fixing belt without pressing the fixing roller and a second fixing part where the pressing roller presses the fixing roller via the fixing belt, a temperature detect device which detects a surface temperature of the fixing belt in the heating area, and a temperature control device which controls the surface temperature of the fixing belt in the heating area to a prescribed temperature which is higher than a lowest fixing temperature that does not cause inferior fixing, but lower than a highest fixing temperature that does not cause toner offsetting during repeated operations.
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