| 摘要 |
PROBLEM TO BE SOLVED: To provide a fixing device capable of efficiently preventing the excessive temperature rise of a pressure member without using a complicated constitution, and capable of preventing hot offset and preventing a recording material from winding around a pressure member when forming images on both sides. SOLUTION: In the fixing device provided with a heat member 10 heated by a heating means, a pressure member 26 coming in contact with the heat member, and a backup member enclosed in the pressure member so as to pressurize the heat member through the pressure member, and for fixing an unfixed image on the recording material while holding and carrying the recording material between the heat member and the pressure member, the backup member is a rotary body, and the longitudinal length of the rotary body is longer than that of the heat member, and the surface area per longitudinal unit length of the part longer than the heat member of the rotary body is made larger than the surface area per longitudinal unit length of the part of the rotary body coming in contact with the heat member. COPYRIGHT: (C)2006,JPO&NCIPI
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