Image forming apparatus

Patent metadata

Field	Value
Publication number	US-9057976-B2
Application number	US-201314061599-A
Country	US
Kind code	B2
Filing date	Oct 23, 2013
Priority date	Oct 29, 2012
Publication date	Jun 16, 2015
Grant date	Jun 16, 2015

Abstract

An image forming apparatus includes a control unit controlling first and second voltage application mechanisms and shifting a difference Vdif (=Vrs−Vdr) between Vrs and Vdr toward polarity opposite to normal charge polarity of a developer as S decreases, where S is an absolute value of a speed difference between a circumferential speed of an image bearing member, which rotates while bearing an electrostatic latent image and a circumferential speed of a developer bearing member, which rotates at a constant circumferential speed ratio with respect to the image bearing member to develop the electrostatic latent image while bearing the developer, Vdr is a voltage that the first voltage application mechanism applies to the developer bearing member, and Vrs is a voltage that the second voltage application mechanism applies to the developer supply member.

First claim

What is claimed is:

1. An image forming apparatus comprising:
an image bearing member configured to rotate while bearing an electrostatic latent image;
a developer bearing member configured to rotate at a constant circumferential speed ratio with respect to the image bearing member while bearing a developer and to develop the electrostatic latent image;
a developer supply member, which includes a foam layer at a surface and is arranged in contact with the developer bearing mem…

Assignees

• Canon Kk

Inventors

• Yoshida Nobuyoshi
• Mitsui Yoshihiro
• Hayashi Kodai
• Taniguchi Hisashi

Classifications

• G03G15/0808

  Physics · mapped topic

• G03G15/0806

  Physics · mapped topic

• G03G15/065 Primary

  Physics · mapped topic