US 12,032,322 B2
Image forming apparatus
Toshihiko Takayama, Kanagawa (JP); Shuichi Tetsuno, Kanagawa (JP); Jun Hara, Kanagawa (JP); Mikihiko Hamada, Kanagawa (JP); Kazuhiro Funatani, Kanagawa (JP); and Shinsuke Kobayashi, Kanagawa (JP)
Assigned to CANON KABUSHIKI KAISHA, Tokyo (JP)
Filed by CANON KABUSHIKI KAISHA, Tokyo (JP)
Filed on Dec. 14, 2022, as Appl. No. 18/080,992.
Claims priority of application No. 2021-205087 (JP), filed on Dec. 17, 2021; and application No. 2021-205132 (JP), filed on Dec. 17, 2021.
Prior Publication US 2023/0195025 A1, Jun. 22, 2023
Int. Cl. G03G 21/00 (2006.01); G03G 15/02 (2006.01); G03G 21/08 (2006.01)
CPC G03G 21/0082 (2013.01) [G03G 15/0233 (2013.01); G03G 21/0035 (2013.01); G03G 21/0064 (2013.01); G03G 21/08 (2013.01); G03G 2221/001 (2013.01); G03G 2221/0042 (2013.01); G03G 2221/0063 (2013.01); G03G 2221/0089 (2013.01)] 12 Claims
OG exemplary drawing
 
1. An image forming apparatus comprising:
an image bearing member configured to be driven to rotate;
a charging member configured to face a surface of the image bearing member to form a charging portion and charge the surface of the image bearing member;
a developing roller configured to feed a developer to the surface of the image bearing member charged by the charging member to form a developer image;
a transfer roller configured to form a transfer portion between the transfer roller and the image bearing member to transfer the developer image from the image bearing member to a transferred member; and
a brush configured to be brought into contact with the surface of the image bearing member to form a brush portion on a side downstream of the transfer portion and upstream of the charging portion in a rotation direction of the image bearing member,
wherein, after the transfer of the developer image onto the transferred member, the developer remaining on the surface of the image bearing member being collected by the developing roller,
wherein the brush is disposed such that, in a cross section perpendicular to a rotation axis of the image bearing member, a contact region of the surface of the image bearing member in contact with the brush overlaps a virtual line containing the rotation axis of the image bearing member and extending upward from the rotation axis in a vertical direction, and
wherein, in the cross section perpendicular to the rotation axis of the image bearing member, on the surface of the image bearing member, a length on the surface of the image bearing member from the transfer portion to the brush portion in the rotation direction of the image bearing member is shorter than a length on the surface of the image bearing member from the charging portion to the transfer portion in the rotation direction of the image bearing member.