Humidity compensation in electrophotographic printing by measuring the dielectric characteristics of the development mixture
US5081498A · kind A · utility
8Cited by
11References
8Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Jan 10, 1991 |
| Grant date | Jan 14, 1992 |
| Priority date | — |
| Expiry date | Jan 10, 2011 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03G15/0851
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A developer unit which stores a supply of developer material has a capacitance cell positioned therein contacting the developer material. The capacitance cell measures the change in capacitance of the developer material and generates a signal indicative thereof. The capacitance change is caused by a change in the dielectric characteristics of the developer material due to changes in the moisture content thereof. This signal, in combination with a signal indicating the concentration of toner particles in the developer material, is used to control various processing stations in the printing machine employing the developer unit.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.