Image forming apparatus and developing method
US7555232B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Oct 22, 2005 |
| Grant date | Jun 30, 2009 |
| Priority date | — |
| Expiry date | Jun 23, 2026 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03G15/0806
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
An image forming apparatus has a plurality of developing devices each including a developing member carrying and transferring developer toward a developing region and a charging member charging developer carried by the developing member, a development bias applying device applying an AC development bias voltage to the developing member, and a charge bias applying device applying to the charging member an AC charge bias voltage having a phase synchronized with the AC development bias voltage and representing a charge bias voltage value causing an offset potential difference with respect to the AC development bias voltage in a phase on one of positive and negative sides. The charge bias voltage applied by the charge bias applying device provided for each of the developing devices has the same voltage value as the charge bias voltages applied by the charge bias applying devices of the other charge bias applying devices.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.