Toner density control for electrophotographic print engine

Details Toner density control for electrophotographic print engine Toner density control for electrophotographic print engine

1990-10-29

1992-04-07

Pendegrass, Joan H.

Photocopying

Contact printing

Light boxes

355246, 355326, G03G 1500, G03G 1501

Patent

active

051032600

ABSTRACT:
A method for measuring and adjusting the toner density of black toner in a multi-color copy machine includes first developing and transferring a layer of yellow toner (132) onto the surface of a transfer belt (18). A crosshatch pattern (134) of black toner is then developed and transferred onto the surface of the yellow toner layer (132) in a series of patches (138)-(148). The cross-hatch pattern (134) is comprised of vertical and horizontal bars (136) that are spaced a predetermined distance apart and have a predetermined width. A toner density sensor (40) is disposed over the surface of the transfer belt (18) to measure the toner density. The amount of toner deposited on a photoreceptor belt (12) is altered by varying the grid voltage on a charging corona (28) during the developing step to provide multiple toner densities for each of multiple patches (138)-(148). This data is then extrapolated to determine what the grid voltage on the charging corona (28) should be for the desired toner density.

REFERENCES:
patent: 3872825 (1975-03-01), Davidson
patent: 4277162 (1981-07-01), Kasahara et al.
patent: 4365894 (1982-12-01), Nakamura
patent: 4816924 (1989-03-01), Sekiya
patent: 4833506 (1989-05-01), Kuru et al.
patent: 4903051 (1990-02-01), Egawa et al.
patent: 4970536 (1990-11-01), Haneda et al.

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