Image forming apparatus with enhanced pretransfer erasing
US5966560A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Aug 29, 1996 |
| Grant date | Oct 12, 1999 |
| Priority date | — |
| Expiry date | Aug 29, 2016 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03G15/167
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
In an electrophotographic copying machine, image quality is improved by suppressing phenomena such as narrowing and thickening of a linear image or discharge noises in a photograph image due to anomalies on transfer of a toner image. For example, a document type is discriminated and when a transfer brush is used for transfer, transfer current and pretransfer erasing are controlled according to the type of document image. The pretransfer erasing is controlled in various following situations: Bi-level exposure method or multi-level exposure method, edge emphasis, photoelectric efficiency, the surface potential of the photoconductor, and position of a developing device.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.