US 12,242,209 B2
Image forming apparatus
Takashi Mukai, Kanagawa (JP); Shuhei Kawasaki, Shizuoka (JP); Hideo Kihara, Kanagawa (JP); Nobuo Oshima, Tokyo (JP); Takahiro Kawamoto, Kanagawa (JP); and Takayuki Kanazawa, Kanagawa (JP)
Assigned to CANON KABUSHIKI KAISHA, Tokyo (JP)
Filed by CANON KABUSHIKI KAISHA, Tokyo (JP)
Filed on Jan. 2, 2024, as Appl. No. 18/401,801.
Claims priority of application No. 2023-002750 (JP), filed on Jan. 11, 2023.
Prior Publication US 2024/0231256 A1, Jul. 11, 2024
Int. Cl. G03G 15/08 (2006.01)
CPC G03G 15/0812 (2013.01) 16 Claims
OG exemplary drawing
 
1. An image forming apparatus comprising:
a rotatable image bearing member;
a charging member configured to electrically charge a surface of the image bearing member;
an exposure unit configured to expose a charged surface of the image bearing member to form an image portion on the image bearing member by an electrostatic latent image;
a developing unit including a rotatable developer carrying member configured to form a developer image on the image bearing member by supplying a developer to the image portion of the image bearing member and including a regulating member configured to regulate the developer carried on the developer carrying member;
a transfer member configured to transfer the developer image, formed on the image bearing member, onto a recording material;
a counting portion configured to acquire a count value obtained by integrating a value correlating with an area of the image portion with respect to a direction along a surface movement direction of the developer carrying member for each of a plurality of regions obtained by dividing a surface region of the image bearing member with respect to a direction substantially perpendicular to the surface movement direction of the developer carrying member;
a driving portion configured to drive the developer carrying member; and
a controller capable of controlling the driving portion,
wherein the controller carries out control so as to perform an image forming operation capable of forming the developer image, on the image bearing member, to be transferred onto the recording material and a non-image forming operation in which the developer image to be transferred onto the recording material is not formed on the image bearing member, and
wherein depending on each of count values in the plurality of regions acquired by the counting portion in a predetermined period, the controller controls the driving portion so as to change a rotation amount of the developer carrying member in a developing rotation operation for rotating the developer carrying member during the non-image forming operation.