Image density control by sensing reference density patterns at multiple points
US4975747A · kind A · utility
17Cited by
3References
8Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Oct 26, 1989 |
| Grant date | Dec 4, 1990 |
| Priority date | — |
| Expiry date | Oct 26, 2009 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03G15/5037
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
An image density control for an electrophotographic copier uses a first and a second reference density pattern having a comparatively low and a comparatively high reference density, respectively. After latent images of the first and second reference density patterns have been formed on a photoconductive element, a potential sensor senses their potentials. In response to the sensed potentials, the potentials of the latent images are set at their predetermined target value. These target values are variable as desired.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.