Patent ID: 11886134
Assignee: RICOH COMPANY, LTD.
Field: Optics (Instruments)
Classification: CPC G | IPC G

Claim 14:
15. A heating device comprising:
a heater;
a safety device having a heat-sensitive surface facing the heater, the safety device configured to cut off power supply to the heater in response to a temperature of the heat-sensitive surface being equal to or higher than a predetermined temperature; and
a holder configured to hold the heater, the holder forming a through hole that opens toward the heater, the holder including a step portion on an inner circumferential surface of the through hole, and the step portion configured to support an end of the heat-sensitive surface and separate a central portion of the heat-sensitive surface of the safety device from the heater, wherein
the heat-sensitive surface includes a first area not in contact with the step portion and a second area in contact with the step portion, and a ratio of the first area to the second area is 5 or more.