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

Claim 18:
19. 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;
a heat storage member 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; and
a thermistor having a detection surface for detecting a temperature of the heat storage member,
wherein the heat storage member has a thermal diffusivity lower than a thermal diffusivity of the annular belt,
wherein the heat storage member has a first portion that faces the detection surface and a second portion that does not face the detection surface, and
wherein a thermal diffusivity of the first portion is higher than a thermal diffusivity of the second portion.