US 12,235,602 B2
Fixing belt and heat fixing device
Hiroki Muramatsu, Tokyo (JP); Noriaki Kobayashi, Ibaraki (JP); Tomoyo Miyakai, Tokyo (JP); and Ryo Ishifuji, Ibaraki (JP)
Assigned to CANON KABUSHIKI KAISHA, Tokyo (JP)
Filed by CANON KABUSHIKI KAISHA, Tokyo (JP)
Filed on Oct. 11, 2023, as Appl. No. 18/484,639.
Claims priority of application No. 2022-164721 (JP), filed on Oct. 13, 2022; and application No. 2023-161480 (JP), filed on Sep. 25, 2023.
Prior Publication US 2024/0126196 A1, Apr. 18, 2024
Int. Cl. G03G 15/20 (2006.01)
CPC G03G 15/2057 (2013.01) [G03G 15/2064 (2013.01); G03G 2215/2051 (2013.01)] 10 Claims
OG exemplary drawing
 
1. A fixing belt having an endless shape comprising:
a base layer having an endless shape;
an elastic layer on an outer peripheral surface of the base layer; and
a surface layer on an outer peripheral surface of the elastic layer,
the elastic layer containing a rubber and fillers dispersed in the rubber,
the fillers containing heat conductive fillers,
an entire thickness of the elastic layer is from 100 μm to 3,000 μm,
a content ratio of the fillers with respect to the entirety of the elastic layer being 35% by volume or more, wherein
when a region from a surface of the elastic layer on a side facing the surface layer to a thickness of 50 μm toward a surface of the elastic layer on an opposite side is defined as a region A, a content ratio of the fillers in the region A is less than 35% by volume with respect to the region A, and
wherein an entirety of the elastic layer has a thermal conductivity of 0.4 W/(m·K) or more in a thickness direction thereof.