Electrophotography – Control of electrophotography process – Of plural processes
Patent
1996-08-08
1998-01-20
Beatty, Robert
Electrophotography
Control of electrophotography process
Of plural processes
399 53, G03G 1500
Patent
active
057109583
ABSTRACT:
A method for adjusting image quality in a printing machine having a variable density image developed on a photoconductive surface in accordance with an initial set of starting values. The method includes a first layer of detecting a plurality of densities of the variable density image and transmitting a plurality of signals with each signal being indicative of a density; generating new starting values, responsive to the plurality of signals, using a linearized perturbation model; calculating error values, responsive to the plurality of signals, minimizing the sum of the squares of the error values; testing the error values for convergence on a set of reference values with each reference value indicative of an acceptable density; repeating the detecting, transmitting, generating, calculating, and testing steps for a plurality of iterations. If the error values exceed the reference values and the plurality of iterations exceed a prescribed value (non-convergence), it will branch to a second and third layer of controlling the development bias voltage and adjusting the toner concentration. If convergence is not obtained in either the second or third layer, an image quality fault will be issued.
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Beatty Robert
Beck J. E.
Fleischer H.
Xerox Corporation
Zibelli R.
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