Image forming apparatus

US9298128B2 · kind B2 · utility

Assignee

• Canon Kabushiki Kaisha · JP

Inventors

• Tatsuaki Orihara · Tokyo, JP
• Shuhei Tokiwa · Tokyo, JP
• Kazunari Hagiwara · Yokohama, JP
• Manami Haraguchi · Yokohama, JP
• Makoto Fukatsu · Soma, JP
• Atsushi Nakamoto · Tokyo, JP

Key dates

• Filing date: Nov 5, 2014
• Grant date: Mar 29, 2016
• Expiry date: Nov 5, 2034

Classification

• Technology area (CPC G): Physics
• CPC primary: G03G2215/0861
• WIPO field: Optics
• WIPO sector: Instruments

Abstract

In an image forming apparatus having a photosensitive drum that carries a toner image, a developing roller is provided to be capable of rotating while carrying toner and supplies the toner to the photosensitive drum in order to develop a latent image, and a voltage applying device applies a voltage to the developing roller. The developing roller includes a conductive base layer and a surface layer covering the base layer, and a surface charge density of the developing roller is equal to or smaller than a surface charge density of the toner.