Positive/negative image forming method and apparatus for electrophotographic image forming device
US4843423A · kind A · utility
9Cited by
2References
2Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Sep 11, 1987 |
| Grant date | Jun 27, 1989 |
| Priority date | — |
| Expiry date | Sep 11, 2007 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03G15/08
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
An electrophotographic image forming apparatus having a photoreceptor for forming an electrostatic image thereon corresponding to an original, a main charger for uniformly charging the photoreceptor to a specific polarity interchangeable developer units each containing a toner or developer capable of being charged to the same polarity as that of the main charger, a transference charger for transferring the toner image from the surface of the photoreceptor, optimally charge removal charger and switching devices for changing the polarities of a voltage applied to the transference charger and charge removal charger.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.