| CPC G03G 15/2057 (2013.01) [G03G 15/2064 (2013.01); G03G 2215/2051 (2013.01)] | 9 Claims |
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1. A fixing rotating member comprising:
a first resin layer having an endless shape;
at least one heating layer on an outer circumferential surface of the first resin layer;
a second resin layer on an outer circumferential surface of the heating layer;
an elastic layer on an outer circumferential surface of the second resin layer; and,
a surface layer on an outer circumferential surface of the elastic layer, wherein
the first resin layer and the second resin layer are different from each other in elastic modulus at a temperature Tc, which is from 160 to 200° C., by at least 10%, and
when a temperature of an outer surface in a central region of the fixing rotating member is referred to as Tc, and a temperature of an outer surface in an end region is referred to as Tc+50° C., a neutral axis in a thickness direction of the fixing rotating member is located in the heating layer or in the second resin layer in the central region and the end region,
for the central region and the end region,
when a number of heating layers observed at a cross section in a width direction orthogonal to a circumferential direction of the fixing rotating member is one, the end region is a region from both ends in the width direction up to 0.02×L1 toward a center in the width direction of the heating layer, and the central region is a region from the center up to 0.48×L1 toward both ends, where the L1 is a length from one end to the other end of the heating layer, and
when the number of the heating layers observed at a cross section in the width direction orthogonal to the circumferential direction of the fixing rotating member is plural, the end region is a region from both ends in the width direction of a heating layer group comprising the plurality of heating layers up to 0.02×L2 toward the center in the width direction, and the central region is a region from the center up to 0.48×L2 toward the both ends, where the L2 is a length from one end to the other end of the heating layer group.
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