Toner dispensing rate adjustment using the slope of successive IRD readings
US5210572A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Sep 5, 1991 |
| Grant date | May 11, 1993 |
| Priority date | — |
| Expiry date | Sep 5, 2011 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03G15/5041
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
The Infra-Red Densitometer (IRD) readings of developed toner patches in a tri-level imaging apparatus are compared to target values stored in Non-Volatile Memory (NVM) and are also compared to the previous IRD reading. Toner dispensing decisions (i.e. addition or reduction) are based on both comparisons. In this manner, not only are IRD readings examined as to how far the reading is from the target, they are examined as to current trend (i.e. whether the reading is moving away from or toward the target). Thus, if the IRD reading indicates that the toner concentration is low but is heading toward the target then the amount of added toner is somewhat reduced. If the IRD reading indicates that the toner concentration is low and is heading away from target (getting lower) then some extra toner is dispensed
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.