Method and apparatus for electrically biasing developing electrode of electrophotographic device
US4050806A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 7, 1975 |
| Grant date | Sep 27, 1977 |
| Priority date | — |
| Expiry date | May 7, 1995 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S101/37
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A photoconductive member is charged and radiated with a light image to produce an electrostatic image. Sensing electrodes automatically sense the remaining potential in a portion of the electrostatic image corresponding to a background area of the original document scanned to produce the light image. In one embodiment the area is a white reference document disposed adjacent to the original document. In another embodiment a reference document is not provided and a plurality of portions of the electrostatic image are sensed. The lowest value of the sensed potential is utilized. Computing means compute and apply the biasing voltage to the developing electrode as a predetermined function of the sensed potential.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.