Electrophotographic copying process using two image areas
US5142327A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Apr 9, 1991 |
| Grant date | Aug 25, 1992 |
| Priority date | — |
| Expiry date | Apr 9, 2011 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03G15/263
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
An electrophotographic copier includes a transfer/charge section, a developer/cleaner section, and a photoreceptor having a surface with first and second image areas. Copies are produced by moving the photoreceptor a half revolution so that the first image area passes through the transfer/charge section in which a uniform charge is applied to the first image area. The charged first image area is exposed to a light image producing an electrostatic image on a surface of the photoreceptor. Toner is applied to the exposed first image area as it passes through the developer/cleaner section. The toned image is transferred to paper by moving the first image area through the transfer/charge section, after which the toner is fused onto the paper. When an another copy is to be made, the second image area passes through the transfer/charge section to apply a uniform charge to that image area while the developer/cleaner section removes residual toner from the first image area. Then the second image area is used to produce the next copy. Otherwise the transfer/charge section is not activated and only the residual toner is removed from the first image area before the copying process ends.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.