| 摘要 |
In a fixing portion, a heating roller and a pressure roller are provided. An angle of separation theta (°), the temperature THR (° C.) of the surface of the heating roller, the diameter DPR (mm) of the pressure roller, and the width WNIP (mm) of a nip part are set to satisfy the following inequality: 114<=0.55 THR-2.36 theta-1.59 DPR+8.62 WNIP<=144.
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