Patent ID: 8781379

Claim:
A fusing device, comprising: a belt; a first stretching member contacting an inner circumference of the belt and stretching the belt tightly; a heating member having a heating element on a flat surface; a biasing member pressing a second stretching member toward the belt; a thermal diffusion member arranged between the heating member and the biasing member; and the second stretching member having a first flat part that faces the heating member, a second flat part that is formed outside a lateral width of the first flat part and that faces a part of the thermal diffusion member, and a curved belt facing part that faces the belt, and stretching the belt tightly with the first stretching member, wherein the first flat part faces the heating member at a center portion of the second stretching member that is on the direct opposite side of the curved belt facing part that contacts the inner circumference of the belt, wherein the heating member does not contact the belt, and wherein the heating member is positioned by contacting the first flat part, and the thermal diffusion member is positioned by contacting the heating member and the second flat part.