Electrophotographic image formation apparatus with two bias voltage sources
US4994855A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 26, 1988 |
| Grant date | Feb 19, 1991 |
| Priority date | — |
| Expiry date | May 26, 2008 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03G17/00
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A photoreceptor for an image formation apparatus has a photosensitive layer of a multi-layer structure each having the characteristic of increasing its electrical resistance at a different rate upon expose to light. An image-carrying beam of reflected light from an original to be copied is made incident on the photoreceptor to form a resistance image. An electrostatic latent image is formed therefrom either on the photoreceptor itself or on a transfer medium placed in contact therewith and a visible toner image is formed by applying toner on such an electrostatic image but the resistance image on the photoreceptor remains undisturbed during such image transfer processes. Thus, a plurality of copies of a single original can be produced without exposing the photoreceptor to reflected light therefrom for each copy to be printed.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.