US 11,693,344 B2
Fixing belt unit and fixing device
Takeshi Kinoshita, Chiba (JP); and Junji Ishikawa, Ibaraki (JP)
Assigned to Canon Kabushiki Kaisha, Tokyo (JP)
Filed by CANON KABUSHIKI KAISHA, Tokyo (JP)
Filed on Dec. 7, 2021, as Appl. No. 17/544,860.
Application 17/544,860 is a continuation of application No. PCT/JP2020/025930, filed on Jun. 25, 2020.
Claims priority of application No. 2019-121149 (JP), filed on Jun. 28, 2019; and application No. 2019-121155 (JP), filed on Jun. 28, 2019.
Prior Publication US 2022/0091547 A1, Mar. 24, 2022
Int. Cl. G03G 15/20 (2006.01)
CPC G03G 15/2053 (2013.01) [G03G 15/2039 (2013.01); G03G 15/2064 (2013.01); G03G 2215/2035 (2013.01)] 9 Claims
OG exemplary drawing
 
1. A fixing belt unit comprising:
a rotatable fixing belt for fixing a toner image on a recording material; and
a heating member including a substrate and a plurality of heat generating elements which are provided on both surfaces of said substrate and which generate heat by energization, and for heating said fixing belt in contact with an inner peripheral surface of said fixing belt,
wherein said plurality of heat generating elements are different from each other in length with respect to a widthwise direction crossing a rotational direction of said fixing belt,
wherein at least three of said heat generating elements are provided on a first surface of said substrate which is a side where said heating member contacts the inner peripheral surface of said fixing belt, and a plurality of heat generating members are provided on a second surface on an opposite side from the first surface of said substrate, and
wherein with respect to the rotational direction, a longest heat generating element, in length with respect to the widthwise direction, of said heat generating elements provided on the first surface is disposed between other heat generating elements.