Vector pinning in an electrophotographic machine

Details Vector pinning in an electrophotographic machine Vector pinning in an electrophotographic machine

G - Physics

03

G

314/7

G03G 15/00 (2006.01)

Patent

CA 1115328

VECTOR PINNING IN AN ELECTROPHOTOGRAPHIC MACHINE Abstract of the Disclosure Apparatus and method for pinning the value of a white, gray or otherwise colored, single-shaded vector in an electrophotographic machine. The vector is the value of the image voltage minus the developer voltage. Valuation of changes in the image voltage are obtained by 1) sensing the reflectivity of a developed single-shaded image and converting that into a representative voltage; 2) sensing the reflectivity of the bare photoconductor and converting that into a repre- sentative voltage; 3) obtaining a measure of the difference between the representative image and reference voltages; and 4) noting changes in the difference. Pinning the vector calls for adjusting the developer voltage or document illumina- tion intensity level an amount necessary to compensate for the change in image voltage.

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