Image forming apparatus for correcting image density drift
US5298943A · kind A · utility
10Cited by
5References
9Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Oct 21, 1992 |
| Grant date | Mar 29, 1994 |
| Priority date | — |
| Expiry date | Oct 21, 2012 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03G15/5045
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
In a printer apparatus according to the present invention, the amount of charge applied to a photoconductor is measured at at least two points. A variation in dark decay which controls an image density, is recognized for the developing position of each developing unit. The grid bias voltage applied to the grid screen of the main charging device and the developing bias voltage applied to each of the developing units are set so as to satisfy the intensities of the contrast voltage and background voltage predetermined for each of the developing positions of the developing units.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.