System for monitoring and controlling electrophotographic toner operation
US4502778A · kind A · utility
28Cited by
17References
11Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Dec 27, 1982 |
| Grant date | Mar 5, 1985 |
| Priority date | — |
| Expiry date | Dec 27, 2002 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03G15/5041
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
Digital circuitry and microprocessor techniques are used to monitor the quality of toner operations in a copier and take appropriate corrective action based upon the monitoring results. Patch sensing is used. Reflectivity signals from the patch and from clean photoconductor are analog-to-digital converted and a plurality of these signals taken over discrete time periods of a sample are stored. The stored signals are averaged for use in determining appropriate toner replenishment responses and/or machine failure indicators and controls.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.