Accurate dynamic control of the potential on the photoconductor

Details Accurate dynamic control of the potential on the photoconductor Accurate dynamic control of the potential on the photoconductor

1994-03-17

1996-06-04

Beatty, Robert

Photocopying

Contact printing

Light boxes

355219, G03G 2100

Patent

active

055238319

ABSTRACT:
The voltages, V.sub.0, on a photoconductor surface are measured over a wide range of grid voltages, the results of which are stored in a look-up table V.sub.grid vs. V.sub.0. The updated V.sub.grid /V.sub.0 look-up table permits automatic and accurate adjustment of the primary charging step in the electrographic cycle. This method accommodates any number of desired V.sub.0 levels over a wide range of voltage. The present use establishes the relationship without going through a lengthy iterative procedure inherent in using feedback adjustment loops. The calibrated look-up table is updated as often as is required to compensate for such things as aging, wear, and environmental changes, to name a few. Calibration is repeated and the entire look-up table is updated after certain intervals of time or usage, or whenever drift is detected at even a single point of the V.sub.grid to V.sub.0 relationship. This compensates for the variability of corona charging over time as well as over a range of V.sub.0 's.

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