| 摘要 |
PROBLEM TO BE SOLVED: To improve temperature detection accuracy of a planar heating element by using an excessive temperature rise preventing device which prevents an excessive temperature rise of the planar heating element within an operational temperature range.SOLUTION: A fixing device includes: a planar heating element 20 in a planar shape; a heat diffusing member 22 that comes into contact with one surface of the planar heating element 20 and diffuses the heat of the planar heating element 20; a belt member sliding on the heat diffusing member 22 to conduct the heat of the heat diffusing member 22; and a pressurizing member 21 that comes into contact with the other surface of the planar heating element 20 and pressurizes the planar heating element 20 in a direction toward the heat diffusing member 22. Grooves and ribs as a rugged shape are formed on a contact-pressing surface of the pressurizing member 21 with the planar heating element 20; and an excessive temperature rise preventing device 23 that prevents an excessive temperature rise of the planar heating element 20 is disposed on the back surface to the contact-pressing surface of the pressurizing member 21. |
