US 11,656,564 B2
Image forming apparatus which includes a belt having an electroconductive layer
Shohei Ishio, Tokyo (JP); Keisuke Ishizumi, Kanagawa (JP); Shinji Katagiri, Kanagawa (JP); Eiichi Hamana, Tokyo (JP); and Noriaki Egawa, Tokyo (JP)
Assigned to CANON KABUSHIKI KAISHA, Tokyo (JP)
Filed by CANON KABUSHIKI KAISHA, Tokyo (JP)
Filed on Jul. 21, 2022, as Appl. No. 17/814,013.
Application 17/814,013 is a continuation of application No. 17/498,970, filed on Oct. 12, 2021, granted, now 11,435,680.
Claims priority of application No. JP2020-189028 (JP), filed on Nov. 12, 2020.
Prior Publication US 2022/0357686 A1, Nov. 10, 2022
This patent is subject to a terminal disclaimer.
Int. Cl. G03G 15/16 (2006.01)
CPC G03G 15/162 (2013.01) [G03G 15/1615 (2013.01)] 10 Claims
OG exemplary drawing
 
1. An image forming apparatus comprising:
an endless belt including a base layer and an electroconductive layer positioned on an inner peripheral surface side of said base layer and forming an inner peripheral surface of said belt; and
a roller provided on the inner peripheral surface side of said belt and including a roller portion around which said belt is wound and which is formed of a metal material,
wherein said electroconductive layer contains a binder resin, an electroconductive agent, and a copper compound, and has surface resistivity of 5.0×106Ω/□ or less,
wherein said roller portion includes a base material formed of a first metal material comprising a first metal, and a coating layer which forms a surface contacting said electroconductive layer and which is formed of a second metal material comprising a second metal, and
wherein a difference in standard potential between the second metal and copper is smaller than a difference in standard potential between the first metal and the copper.