Patent ID: 11971666
Assignee: CANON KABUSHIKI KAISHA
Field: Optics (Instruments)
Classification: CPC G | IPC G

Claim 0:
1. An image forming apparatus comprising:
a photosensitive drum;
a charging roller configured to charge the photosensitive drum;
a laser light source configured to expose the photosensitive drum charged by the charging roller to form an electrostatic latent image;
a developing roller configured to form a developer image on a surface of the photosensitive drum by supplying thereto a developer containing toner and particles that assist transfer at a developing position facing the photosensitive drum, the developing roller being configured to move between a first position, which is where the developing roller contacts the photosensitive drum to supply the developer to the surface of the photosensitive drum, and a second position, which is where the developing roller is separated from the photosensitive drum so that the developer is not supplied to the surface of the photosensitive drum;
a transfer roller configured to transfer the developer image to a transfer target;
a charging voltage power supply configured to apply charging voltages including a first charging voltage, a second charging voltage that is lower, in an absolute value, than the first charging voltage, and a third charging voltage that is lower, in an absolute value, than the second charging voltage, to the charging roller; and
a controller controlling that controls the charging voltage power supply and configured to execute:
an image forming operation of forming an image on the transfer target in a state where the developing roller is located at the first position and the first charging voltage is applied;
a first rotating operation of rotating the photosensitive drum in a state where the developing roller is located at the first position and the second charging voltage is applied;
a second rotating operation of rotating the photosensitive drum in a state where the developing roller is located at the second position and the third charging voltage is applied; and
so that the first rotating operation and the second rotating operation are performed after the image forming operation.