Patent ID: 8879972

Claim:
A fuser, comprising: a cylindrical heating rotating body including a heat generator; and a pressure rotating body including a circumferential face which has contact with the heating rotating body to form a nip portion for fusing, wherein a disk-like outside plate, which is exposed outside, is provided in one end or both ends of the heating rotating body in a rotation axis direction, a disk-like inside plate is provided in an inner circumferential face of the heating rotating body on an inside of the outside plate to have an interval relative to the outside plate, a center vent is provided near a center of the outside plate, an outer edge vent is provided in an outer edge or the neighborhood thereof of the outside plate, and a flow path, which connects the center vent and the outer edge vent, is provided between the outside vent and the inside vent, wherein a thermal deformation plate including bimetal, to increase or decrease air flow volume in the flow path by a change in a curvature according to temperature in the rotation of the heating rotating body, is disposed between the outside plate and the inside plate.