US 11,860,566 B2
Image forming apparatus
Takayuki Kanazawa, Kanagawa (JP); Nobuo Oshima, Tokyo (JP); Takayoshi Kihara, Shizuoka (JP); Kuniaki Tamagaki, Kanagawa (JP); Shuhei Tokiwa, Tokyo (JP); and Taichi Sato, Kanagawa (JP)
Assigned to Canon Kabushiki Kaisha, Tokyo (JP)
Filed by CANON KABUSHIKI KAISHA, Tokyo (JP)
Filed on Dec. 15, 2022, as Appl. No. 18/081,910.
Claims priority of application No. 2021-204782 (JP), filed on Dec. 17, 2021; and application No. 2021-204783 (JP), filed on Dec. 17, 2021.
Prior Publication US 2023/0195026 A1, Jun. 22, 2023
Int. Cl. G03G 21/00 (2006.01); G03G 15/02 (2006.01); G03G 15/16 (2006.01); G03G 21/16 (2006.01)
CPC G03G 21/0064 (2013.01) [G03G 15/0225 (2013.01); G03G 15/168 (2013.01); G03G 21/0005 (2013.01); G03G 21/007 (2013.01); G03G 21/169 (2013.01); G03G 21/0035 (2013.01); G03G 2215/022 (2013.01); G03G 2221/0005 (2013.01); G03G 2221/0089 (2013.01); G03G 2221/1618 (2013.01); G03G 2221/1627 (2013.01)] 37 Claims
OG exemplary drawing
 
1. An image forming apparatus comprising:
a rotatable image bearing member;
a developing member configured to develop an electrostatic latent image, formed on a surface of the image bearing member, with toner in a developing portion;
a transfer member configured to transfer a toner image, obtained by developing the electrostatic latent image by the developing member, from the image bearing member onto a toner image receiving member in a transfer portion; and
a brush contacting the surface of the image bearing member in a contact portion downstream of the transfer portion and upstream of the developing portion with respect to a rotational direction of the image bearing member,
wherein the toner which is not transferred onto the toner image receiving member is collected by the developing member,
wherein in a charging series, the toner is positioned on the same side as a normal charge polarity of the toner relative to the brush, and
wherein in the contact portion,
a maximum value of a contact pressure of 0.7 gf/mm2 or more and 3.5 gf/mm2 or less,
a maximum contact area ratio is 18% or more and 74% or less, and
a Clark-Evans index of the brush is 1 or more.