Compact electrophotographic printing apparatus having an improved development means and a method for operating the same
US4804994A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Feb 6, 1987 |
| Grant date | Feb 14, 1989 |
| Priority date | — |
| Expiry date | Feb 6, 2007 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03G2215/0497
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A compact and simple structured electrophotographic printing apparatus having a single magnetic developer, in which an accumulation of toner particles is formed on a photosensitive member at a downstream position from the magnetic developer. The accumulation of the toner particles is formed by moving a photosensitive film and a magnetic brush in rubbing contact with the film in mutually opposite directions, or by deforming a magnetic field generated by the magnetic developer, using a magnetic piece. A recording electrode is disposed on a sleeve of the magnetic developer and facing the photosensitive film. Bias voltages, having polarities opposite to each other with respect to the photosensitive film, are respectively applied to the recording electrode and the sleeve. An optical beam is projected onto the photosensitive film in a region facing the recording electrode. Thus, with the aid of toner particles located between the recording electrode and the photosensitive film and the accumulation of the toner particles, sensitizing, developing and scavenging are carried out simultaneously, and thus a toner image is produced on the photosensitive film. For a magnetic developer having a r…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.