Toner dispensing rate adjustment using the slope of successive I

Details Toner dispensing rate adjustment using the slope of successive I Toner dispensing rate adjustment using the slope of successive I

1991-09-05

1993-05-11

Braun, Fred L.

Photocopying

Contact printing

Light boxes

355246, G03G 1508, G03G 2100

Patent

active

052105725

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

REFERENCES:
patent: 4974024 (1990-11-01), Bares et al.
patent: 4998139 (1991-03-01), May et al.
patent: 5021838 (1991-06-01), Parker et al.
patent: 5081491 (1992-01-01), Lux et al.

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