US 12,253,814 B2
Fixing device and image forming apparatus
Takaaki Akamatsu, Kanagawa (JP); Toru Imaizumi, Kanagawa (JP); Shoichiro Ikegami, Kanagawa (JP); and Yuki Oshima, Kanagawa (JP)
Assigned to Canon Kabushiki Kaisha, Tokyo (JP)
Filed by CANON KABUSHIKI KAISHA, Tokyo (JP)
Filed on Dec. 29, 2023, as Appl. No. 18/401,176.
Claims priority of application No. 2023-005656 (JP), filed on Jan. 18, 2023.
Prior Publication US 2024/0241466 A1, Jul. 18, 2024
Int. Cl. G03G 15/20 (2006.01)
CPC G03G 15/2053 (2013.01) [G03G 15/2064 (2013.01)] 13 Claims
OG exemplary drawing
 
1. A fixing device comprising:
a first rotation member;
a heater having an elongated shape and configured to include a heating element and a substrate on which the heating element is disposed, wherein the heater is disposed in an internal space of the first rotation member;
a heater holder configured to hold the heater; and
a second rotation member, wherein, to fix an image formed on a recording material, the heater and the second rotation member nip the first rotation member therebetween, and the image formed on the recording material is heated at a nip portion via the first rotation member,
wherein the heater holder has a protrusion that is disposed at a position, which is outside the nip portion and on a downstream side in a conveyance direction of the recording material, and comes into contact with the first rotation member, and
wherein, when a direction of a long side of a first surface of the substrate on which the heating element is disposed is a longitudinal direction, a direction orthogonal to the longitudinal direction on the first surface is a lateral direction, and a direction orthogonal to the longitudinal direction and the lateral direction is a thickness direction,
the protrusion protrudes in the thickness direction toward the second rotation member without crossing a nip tangent line that passes through a contact surface between the first rotation member and the second rotation member and extends parallel to the contact surface, and
a length in the longitudinal direction of the protrusion is shorter than a length in the longitudinal direction of the recording material of a maximum size which is able to be conveyed.