Image forming apparatus having simultaneous development and cleaning

摘要

When an outer diameter of a charging member is defined as Hc, a ratio of the circumferential velocity of the charging member to the circumferential velocity of an image bearing member is defined as Rc, an outer diameter of a developer bearing member is defined as Hd, and a ratio of the circumferential velocity of the developer bearing member to the circumferential velocity of the image bearing member is defined as Rd, the relationship Hc/Rc≧Hd/Rd is satisfied.

主权项

1. An image forming apparatus, comprising:
an image bearing member; a charging member that is configured to rotate while contacting the image bearing member and charge the image bearing member; and a developer bearing member that is configured to rotate while contacting the image bearing member and supply developer to the image bearing member, and that collects the developer remaining on the image bearing member after a developer image formed on the image bearing member is transferred to a recording material, wherein the image bearing member and the charging member move in a same direction at a first contact portion between the image bearing member and the charging member, wherein the image bearing member and the developer bearing member move in a same direction at a second contact portion between the image bearing member and the developer bearing member, and wherein if an outer diameter of the charging member is defined as Hc, a ratio of a circumferential velocity of the charging member to a circumferential velocity of the image bearing member is defined as Rc, an outer diameter of the developer bearing member is defined as Hd, and a ratio of a circumferential velocity of the developer bearing member to the circumferential velocity of the image bearing member is defined as Rd, a relationship:
Hc/Rc≧Hd/Rd is satisfied.