Reducing waste toner with electrophotographic voltage control in imaging devices
US10809641B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Jul 22, 2019 |
| Grant date | Oct 20, 2020 |
| Priority date | — |
| Expiry date | Jul 22, 2039 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03G2215/00084
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
An imaging device includes a photoconductive drum charged by a charge roll and opposed by developer roll. The developer roll adds toner to the drum to develop a latent image on the drum for transfer to media or an intermediate transfer member at a transfer roll. One or more high voltage power supplies communicate with a controller to set voltages on the rolls. During times of non-imaging, but rotation of the drum, the charge roll charges the drum to less than a Paschen breakdown voltage of the drum. A voltage of the transfer roll is determined that corresponds to a temperature and relative humidity of an operating environment of the imaging device and the developer roll is charged based thereon. The charge of the transfer roll is set close to the charge of the drum, but higher in magnitude. A laser may also discharge the drum.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.