Mass-based sensing of charging knee for active control of charger settings
US7593654B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jan 16, 2007 |
| Grant date | Sep 22, 2009 |
| Priority date | — |
| Expiry date | May 1, 2028 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03G2215/00037
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A xerographic marking engine adjusts a charging actuator, such as an AC peak-to-peak voltage or an AC peak-to-peak AC current, based upon toner patch density measurements made using, e.g., a toner patch density sensor. The sensor is used to detect a knee in a toner mass density curve obtained by sweeping an AC peak-to-peak voltage or an AC peak-to-peak current. Once the knee is located, an AC charging actuator peak-to-peak voltage or AC peak-to-peak current is determined that reduces the amount of positive charge that is deposited onto the surface of the photoconductor, thereby extending its life while maintaining acceptable print quality. The described approach may improve photoconductor life without significantly increasing production costs or complexity.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.