| 摘要 |
PROBLEM TO BE SOLVED: To provide a fixing device capable of fixing excellently without troubles such as waviness and curl at a rear end in a recording sheet even when the recording sheet is thin paper.SOLUTION: A fixing device comprises: a fixing roller 11; a pressure roller 12 in pressure contact with the fixing roller 11 through a fixing belt 14; a halogen heater 15A which mainly heats a center part of a heating roller 13 in the axis direction; a halogen heater 15B which mainly heats both end parts of the heating roller 13 in the axis direction; and control means 61 which controls electrification of the halogen heaters 15A, 15B. The pressure roller 12 is shaped to have external diameters of both end parts in the axis direction greater than that of a center part. When a transferred material is thin paper, the control means 61 increases a heat amount supplied by the halogen heater 15A greater than that supplied by the halogen heater 15B, thus making a temperature of the center part of the heating roller 13 in the axis direction higher than that of the end parts to expand the center part of the pressure roller 12 in the axis direction than the end parts, and thus to make small the external diameter difference (D-D) between the end parts and the center part in the axis direction. |
