Biased charge roller with embedded electrodes with post-nip breakdown to enable improved charge uniformity
US7177572B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jun 25, 2004 |
| Grant date | Feb 13, 2007 |
| Priority date | — |
| Expiry date | Apr 9, 2025 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03G2215/021
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
Electrodes are embedded in a biased charge roller of a xerographic device. The electrodes, which may run the length of the roller, are deposited on an insulating substrate. A semi-conductive conformable layer of a flexible elastomer covers the electrodes. The semi-conductive conformable layer limits current flow between electrodes and relaxes charge deposited on the roller surface. Stationary pre-nip and post-nip contacts apply the bias to the imbedded electrodes. The electrodes in the post nip region are biased to VPOST. The electrodes positioned in the pre-nip regions are either grounded or biased to VPRE<VPOST. The electroded biased charge roller may generate air breakdown in the post nip region, resulting in highly uniform charging.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.