US 11,809,105 B2
Fixing apparatus
Takaaki Tsuruya, Shizuoka (JP); and Yusuke Isomi, Kanagawa (JP)
Assigned to Canon Kabushiki Kaisha, Tokyo (JP)
Filed by CANON KABUSHIKI KAISHA, Tokyo (JP)
Filed on Mar. 28, 2022, as Appl. No. 17/706,327.
Claims priority of application No. 2021-060822 (JP), filed on Mar. 31, 2021.
Prior Publication US 2022/0317603 A1, Oct. 6, 2022
Int. Cl. G03G 15/20 (2006.01)
CPC G03G 15/2039 (2013.01) 12 Claims
OG exemplary drawing
 
1. A fixing apparatus to fix a toner image formed on a recording material to the recording material, the fixing apparatus comprising:
a rotatable member including a heat generation layer;
a power supply circuit configured to supply electrical power to the rotatable member; and
a control unit configured to control the supply of the electrical power to the rotatable member and to detect a change rate of electrical resistance of the heat generation layer,
wherein the heat generation layer generates heat by the electrical power supplied to the rotatable member, and the toner image on the recording material is fixed to the recording material by the heat from the heat generation layer,
wherein an absolute value of a temperature coefficient of resistance of the heat generation layer is 550×10−6/° C. or higher, and
wherein, if the change rate of the electrical resistance to the supplied electrical power is higher than a predetermined threshold, the control unit stops the supply of electrical power to the rotatable member.