Development device and image forming apparatus provided therewith
US7917046B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Jun 20, 2008 |
| Grant date | Mar 29, 2011 |
| Priority date | — |
| Expiry date | Jul 31, 2029 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03G15/0907
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
The first direct-current bias power supply applying the first direct-current bias Vdc1 and the first alternating-current bias power supply applying the first alternating-current bias Vac1 are connected to a development roller. The second direct-current bias power supply applying the second direct-current bias Vdc2 and the second alternating-current bias power supply applying the second alternating-current bias Vac2 are connected to a magnetic roller. The peak-to-peak value Vpp of the first alternating-current bias Vac1 applied to the development roller remains the same, and the second alternating-current bias Vac2 that is in phase with the first alternating-current bias Vac1 and that has a peak-to-peak value of a predetermined value or above is applied to the magnetic roller. Thus, the potential difference between the peak voltage of the development bias on the opposite polarity side to the polarity of the toner and the peak voltage of a supply bias is set at a predetermined value or below.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.