Patent ID: 7324778
Filing Date: 2008-01-29
Classification: G03G

Abstract:
1. A fixing device comprising: a heating roller including a rubber layer having a thickness of 0.3 mm or more and a fluororesin layer having a thickness of 0.03 mm or more provided on the rubber layer; and a pressure roller including a rubber layer having a thickness of 12 mm or more, the pressure roller rotating in contact with the heating roller which is adapted to heat and press a recording material having an unfixed image retained thereon while being conveyed between the heating roller and the pressure roller so that the unfixed image is fixed to the recording material, wherein supposing that a total load given to the heating roller and the pressure roller is W (kgf) and an area of a pressure contact portion of the heating roller with respect to the pressure roller (nip area) is S (cm wherein a length of the pressure contact portion in the direction parallel to the direction of conveyance of the recording material is defined to be 14 mm or more.