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

Claim 23:
24. An image forming apparatus comprising:
a rotatable image bearing member;
a charging member forming a charging portion in contact with the image bearing member and configured to electrically charge a surface of the is image bearing member in the charging portion;
a developing member configured to develop, with the toner, an electrostatic latent image formed on the surface of the image bearing member;
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 provided so as to contact the surface of the image bearing member in a contact portion downstream of the transfer portion and upstream of the charging portion with respect to a rotational direction of the image bearing member, and configured to electrically charge the toner which is not transferred onto the toner image receiving member,
wherein the toner which is not transferred onto the toner image receiving member is collected by the developing member, and
wherein when a penetration amount of the brush in the surface of the image bearing member at the upstream end of the brush with respect to the rotational direction is δ1 (mm) and a penetration amount of the brush in the surface of the image bearing member at the downstream end of the brush with respect to the rotational direction is δ2 (mm), the following relationship is satisfied:

δ1>δ2>0.