| 摘要 |
<P>PROBLEM TO BE SOLVED: To suppress an excessive temperature rise in a non paper passing area of a fixing belt 1 without increasing the size of a device. <P>SOLUTION: When image formation is performed on a recording material whose width is narrower than a maxim-width recording material, an outside core 7a is evacuated so that a non paper passing area of a fixing belt 1 does not excessively increase its temperature, while the fixing belt 1 can increase its temperature in an area W among the non paper passing area. That is, a magnetic flux in the area W of the fixing belt 1 is not shielded by a magnetic flux shielding plate 11. In order to suppress the excessive temperature rise of the fixing belt 1 in the area W, an even heat roller 9 is contacted with a pressure roller 2 to indirectly cool the fixing belt 1. As a result, the increase in size of a device is avoided caused by extending the length in the width direction of the magnetic flux shielding plate 11 while the heat deterioration of the fixing belt can be prevented. <P>COPYRIGHT: (C)2013,JPO&INPIT |
