Patent ID: 11921446
Assignee: OKI ELECTRIC INDUSTRY CO., LTD.
Field: Optics (Instruments)
Classification: CPC G | IPC G

Claim 19:
20. A fixing device comprising:
an annular belt;
a heating member facing an inner circumferential surface of the annular belt;
a holder member disposed at an inner side of the annular belt and holding the heating member; and
a film disposed between the heating member and the holder member so as to face a surface of the heating member at a side opposite to a side at which the annular belt is disposed, wherein the film has a thermal diffusivity lower than a thermal diffusivity of the annular belt, and the heating member includes
a heater disposed to face the film, and
a heat diffusion member made of a metal, disposed between the annular belt and the heater, and contacting the annular belt, and a surface area of which is smaller than a surface area of the heating member.