Auto-bias developing apparatus
US4139299A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 30, 1976 |
| Grant date | Feb 13, 1979 |
| Priority date | — |
| Expiry date | Mar 30, 1996 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03G15/065
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
The process and device are for use in an electrophotographic copying machine using a developing agent of liquid type. A counter-electrode is maintained closely spaced from the peripheral surface of a photosensitive drum bearing an electrostatic latent image thereon and itself electrically floating. The developing solution, which inherently has a substantial conductivity is supplied into the space between the drum surface and the counter-electrode so as to develop the latent image. During the development of latent image, a weak d.c. current flow, is passed between the counter-electrode and the drum through the segment of the developing solution filling the space so that a good relation between potentials on the drum surface and the counter-electrode is obtained to eliminate background smearing. The d.c. current may be controlled to decrease in value as the induced potential on the counter-electrode increases.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.