System for controlling electrostatic voltmeters in a tri-level h

Details System for controlling electrostatic voltmeters in a tri-level h System for controlling electrostatic voltmeters in a tri-level h

1994-12-14

1996-07-30

Royer, William J.

Photocopying

Contact printing

Light boxes

355208, G03G 1501, G03G 2100

Patent

active

055417213

ABSTRACT:
In a xerographic printer for tri-level highlight color imaging, two electrostatic voltmeters (ESVs) are used to interpolate the electrostatic potential at a particular location along the path of the photoreceptor belt. Anomalous ESV readings, such as would be caused by dirt interfering with the ESV itself as opposed to systemic changes in the whole apparatus, are detected by having the printer enter a "test mode" in which test patches having minimal charge are monitored by the ESVs. The low-charge test patches enable noise related directly to the ESVs to be isolated from other possible sources of noise. The noise which results from ESV malfunctioning is compensated for when the printer returns to operation.

REFERENCES:
patent: 4078929 (1978-03-01), Gundlach
patent: 5119131 (1992-06-01), Paolini et al.
patent: 5132730 (1992-07-01), Hurwitch et al.
patent: 5157441 (1992-10-01), Scheuer et al.
patent: 5208632 (1993-05-01), Hurwitch et al.
patent: 5285241 (1994-02-01), Scheuer

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