Image density control method for electrophotography
US4519695A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Feb 7, 1983 |
| Grant date | May 28, 1985 |
| Priority date | — |
| Expiry date | Feb 7, 2003 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03G15/5041
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A method of controlling an image density in electrophotography by controlling at least one of various image density parameters in response to values detected from different pattern areas, the image density parameters including an amount of charge deposited on a photoconductive element by a charger, bias voltage for development, toner concentration in a developer, amount of toner supply to a developing unit and image transfer potential. The method forms at least two pattern areas having different potentials on the surface of the photoconductive element by at least one of various means for forming charge patterns which include controlling the energization of the charger, controlling an illumination lamp and projecting an image pattern. In different ranges respectively assigned to the two pattern areas, there is digitized at least one of values associated with an image density which include a surface potential of the pattern area before development, toner density of the pattern area after development, surface potential of the pattern area after development and image density of an area of a transferred image which corresponds to the pattern area. The digitized data of the different pat…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.