Patent ID: 11860566
Assignee: CANON KABUSHIKI KAISHA
Field: Optics (Instruments)
Classification: CPC G | IPC G

Claim 0:
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.