Paul A Lachapelle

42284805, Oct 14, 1980

Feb 12, 1979

6/011606

Bruce R. Benwood - Spencerport NY
Paul A. LaChapelle - Fairport NY

Eastman Kodak Company - Rochester NY

H01T 1904

361235

In-place primary charging of an electrophotographic imaging member is effected by a corona discharge device which employs variably-biased AC energization of its discharge electrode. During a charging period the potential level of the image member is detected by a sensor, and the bias level of electrode energizing source is varied from an initial value above the nominal primary charge potential toward the nominal potential in response to signals from the sensor.

42452724, Jan 13, 1981

Apr 30, 1979

6/034228

Allen J. Rushing - Webster NY
Bruce R. Benwood - Spencerport NY
Paul A. LaChapelle - Fairport NY

Eastman Kodak Company - Rochester NY

H01T 1900

361229

Primary charging of a moving electrographic photoconductor to a nominal potential level is achieved with low sensitivity to variation in system parameters, such as photoconductor capacitance, photoconductor velocity and/or charger efficiency. Separately-addressed, AC corona discharge units are arranged and predeterminedly biased to first substantially overcharge the photoconductor relative to the nominal potential and then discharge the photoconductor to exit at the nominal potential level.