Toner charge control for image defect reduction
US6381424B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Sep 21, 2000 |
| Grant date | Apr 30, 2002 |
| Priority date | — |
| Expiry date | Sep 21, 2020 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03G15/0806
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A charge amount controlling roller serving as a charge amount controlling member is placed to face to a developing roller and is disposed on an upstream side, in a rotation direction of the developing roller, of a developing position at which a photosensitive drum and the developing roller face to each other. The charge amount controlling roller is biased with a voltage having the same polarity as that of non-latent-image portions on the photosensitive drum with respect to the developing roller, thereby reducing extraordinarily charged developing agents, or high charged, low charged, reverse charged toners otherwise causing image defects such as fogs.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.