Apparatus for monitoring and controlling electrical parameters o

Details Apparatus for monitoring and controlling electrical parameters o Apparatus for monitoring and controlling electrical parameters o

1997-11-20

1999-12-21

Lee, Susan S.Y.

Electrophotography

Control of electrophotography process

Of plural processes

399 48, 399 50, 399 51, 399 53, G03G 1500

Patent

active

060060476

ABSTRACT:
An apparatus for monitoring and controlling electrical parameter of an imaging surface, the monitoring controlling apparatus including a patch generator for recording a first control patch at a first voltage level and a second control patch at a second voltage level on the imaging surface; electrostatic voltmeter for measuring voltage potentials associated with the first control patch and second control patch. A processor, in communication with the patch generator, calculates the electrical parameters of the imaging surface from the measured voltage potentials from the first and second control patches. The processor determines a deviation between the calculated electrical parameters values and setup values. Then, the processor produces and sends a feedback error signal to the patch generator if the deviation exceed a threshold level. The patch generator records a third control patch at a third voltage level on the imaging surface upon reception of the error signal. The ESV senses the third control patch. The processor calculates the electrical parameters of the imaging surface from the measured voltage potential of the third control patch and determines a correction factor. The charging device, exposure system and developer are adjusted in accordance to the correction factor.

REFERENCES:
patent: 4341461 (1982-07-01), Fantozzi
patent: 4348099 (1982-09-01), Fantozzi
patent: 5689763 (1997-11-01), Rathbun et al.
patent: 5903796 (1999-05-01), Budnik et al.
patent: 5937229 (1999-08-01), Walgrove et al.

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