| 摘要 |
PROBLEM TO BE SOLVED: To provide a fixing device which improves the performance of separating a recording medium (form) from a fixing roller, and to provide an image forming apparatus including the ixing device. SOLUTION: The fixing device which includes the rotatable fixing roller 15 having a heating source 14 inside and a pressure roller 16 pressed against the fixing roller 15 to apply pressure, and heats, presses, and fixes an unfixed toner image together with a recording medium S between the fixing roller 16 and a nip part of the pressure roller 16 is characterized in that when fixing roller temperature needed to fix the unfixed image is denoted as T1 and fixing roller temperature at which separation resisting force when the recording medium S is peeled off the fixing roller 15 after passing through the nip part is less than a predetermined value is denoted as T2, fixing roller temperature Tin right before the nip part is above T1 and fixing roller temperature right after the nip part is below T2, T1 and T2 being controlled so that T1>T2. COPYRIGHT: (C)2008,JPO&INPIT
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