US 12,124,182 B2
Image-forming apparatus to control potential difference based on image-forming operation
Shuichi Tetsuno, Kanagawa (JP); Toshihiko Takayama, Kanagawa (JP); Shuhei Tokiwa, Tokyo (JP); Shimpei Ishikawa, Kanagawa (JP); Shunsuke Matsushita, Kanagawa (JP); and Mikihiko Hamada, Kanagawa (JP)
Assigned to Canon Kabushiki Kaisha, Tokyo (JP)
Filed by CANON KABUSHIKI KAISHA, Tokyo (JP)
Filed on Mar. 10, 2023, as Appl. No. 18/181,986.
Claims priority of application No. 2022-045084 (JP), filed on Mar. 22, 2022.
Prior Publication US 2023/0305422 A1, Sep. 28, 2023
Int. Cl. G03G 15/00 (2006.01); G03G 15/02 (2006.01); G03G 15/06 (2006.01); G03G 21/00 (2006.01)
CPC G03G 15/0266 (2013.01) [G03G 15/0216 (2013.01); G03G 15/065 (2013.01); G03G 21/0064 (2013.01); G03G 2215/022 (2013.01)] 12 Claims
OG exemplary drawing
 
1. An image-forming apparatus to execute an image-forming operation to form an image on a recording material, the image-forming apparatus comprising:
an image bearing member configured to rotate;
a charging member configured to form a charging portion by being in contact with the image bearing member and to charge a surface of the image bearing member at the charging portion;
a developing member configured to supply toner to the image bearing member at a developing portion facing the image bearing member;
a drive unit configured to rotationally drive the image bearing member;
a storing unit configured to store information about a number of execution times of the image-forming operation;
a charging voltage applying unit configured to apply a charging voltage to the charging member;
a developing voltage applying unit configured to apply a developing voltage to the developing member; and
a control unit configured to control the drive unit, the charging voltage applying unit, and the developing voltage applying unit,
wherein, in a case where a first state in which the image bearing member rotates is shifted to a second state in which the image bearing member stops rotating, a surface potential of the image bearing member formed on the developing portion is defined as V1, the developing voltage applied to the developing member is defined as V2, the charging voltage applied to the charging member is defined as V3, and a surface potential of the image bearing member formed on the charging portion is defined as V4, and
wherein the control unit controls a first potential difference, which is a potential difference between the V2 and the V1, and a second potential difference, which is a potential difference between the V3 and the V4, based on the information about the number of execution times of the image-forming operation.