Developing device in electrophotographic copying apparatus
US4021111A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 6, 1975 |
| Grant date | May 3, 1977 |
| Priority date | — |
| Expiry date | Jun 6, 1995 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03G15/10
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
An improved developing device in electrophotographic copying apparatus in which a plurality of developing electrodes are disposed along a path of movement of a photosensitive drum surface. The electrodes are applied with voltages in a graded manner which conforms to the damping characteristic of the potential on the photosensitive surface at a developing station. The values of voltages applied can be controlled in accordance with the value of potential formed by an imaging area of the drum surface while maintaining the graded potential to thereby achieve an excellent developing effect. Further, the drum surface is provided with an unexposed and hence high potential portion which serves to remove toner which accumulates on the electrodes.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.