Patent · US Expired

Image forming apparatus

US6330405A · kind A · utility

8Cited by

3References

6Claims

0Family size

Assignee

Hitachi Koki Co., Ltd. · JP

Inventors

Masayoshi Ishii · Sendai, JP
Hiroyuki Mabuchi · Ibaraki, JP
Koji Kato · Sendai, JP

Key dates

Filing date	Dec 11, 2000
Grant date	Dec 11, 2001
Priority date	—
Expiry date	Dec 11, 2020

Classification

Technology area (CPC G)Physics
CPC primaryG03G2215/0648
WIPO fieldOptics
WIPO sectorInstruments

Abstract

In an image forming apparatus, the developing unit includes two developing rollers whose rotational directions are different from each other, and a bias potential of the developing roller (first developing roller) located upstream in the rotational direction of the photosensitive member is selected to be a potential, which is in value between a bias potential of the developing roller (second developing roller) located downstream in the same direction and a background potential.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.