Image forming apparatus for correcting image density drift

Details Image forming apparatus for correcting image density drift Image forming apparatus for correcting image density drift

1992-10-21

1994-03-29

Grimley, A. T.

Photocopying

Contact printing

Light boxes

355203, 355214, 355246, G03G 2100

Patent

active

052989437

ABSTRACT:
In a printer apparatus according to the present invention, the amount of charge applied to a photoconductor is measured at at least two points. A variation in dark decay which controls an image density, is recognized for the developing position of each developing unit. The grid bias voltage applied to the grid screen of the main charging device and the developing bias voltage applied to each of the developing units are set so as to satisfy the intensities of the contrast voltage and background voltage predetermined for each of the developing positions of the developing units.

REFERENCES:
patent: 4390265 (1983-06-01), Suzuki et al.
patent: 4536082 (1985-08-01), Motohashi et al.
patent: 4563081 (1986-01-01), Sato
patent: 4879577 (1989-11-01), Mabrouk et al.
patent: 5034772 (1991-07-01), Suzuki

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