| 摘要 |
PURPOSE:To make transport of a recording material as a body to be heated stabilized without extending the distance between a transferring part and a fixing part by providing a film driving roller with an elastic body layer on its core bar and a specific high elastic modulus layer thereon. CONSTITUTION:The film driving roller 4 in common with a pressure roller is constituted of a core bar 4a, a silicone rubber elastic body layer 4b and a high elastic modulus layer 4c as the outermost layer. A film 2 is disposed in press-contact with the surface of the heating body 3 while holding the film 2 with a prescribed pressing force by a bearing mean/energizing means. The elastic modulus of the high elastic modulus layer 4c is >=100kg/mm<2> and the coefficient of thermal expansion is <100PPM/ deg.C. When the elastic body layer 4b thermally expands, a force pushing up the high elastic modulus layer 4c generates thereby generating a force extending the high elastic modulus layer 4c in the peripheral direction. At this time, the expansion of the elastic body layer 4b is suppressed because the coefficient of thermal expansion of the high elastic modulus layer 4c is low and the elastic modulus thereof is high. |
