Patent ID: 7725066

Claim:
A fixing roller that is included in a fixing apparatus of an image forming apparatus and that includes: a core; an elastic layer made of an elastic material, formed around the core; and a resin layer made of fluorine resin, formed around the elastic layer, the resin layer having a thickness of 40 μm or more, a peripheral velocity of the fixing roller being set to be 300 mm/s or more in the fixing apparatus, the fixing roller meeting a relation Tr≧Tc+60 where Tr (° C.) is a limit temperature obtained in a detachment test and Tc (° C.) is a temperature of the fixing roller at which the fixing apparatus performs a fixing process, the detachment test being performed in such a manner that a part of the fixing roller that includes the elastic layer and the resin layer is cut out as a sample, the sample is heated in contact with a heating material with a temperature X (° C.) while being subjected to application of a load, and it is confirmed whether or not the resin layer is detached from the elastic layer in the sample after the heating, the detachment test being performed plural times with different temperatures X (° C.), a detachment test with a highest temperature X (° C.) being selected out of one or more detachment tests in which detachment between the resin layer and the elastic layer is not observed, and the temperature X (° C.) of the selected detachment test being regarded as the limit temperature.