Electrophotography – Control of electrophotography process – Of plural processes
Patent
1997-02-11
1998-11-17
Brase, Sandra L.
Electrophotography
Control of electrophotography process
Of plural processes
399 46, G03G 1500
Patent
active
058390200
ABSTRACT:
A reproduction apparatus and method particularly suited for an electrophotographic DAD-CAD system having an electrostatic recording member for supporting an electrostatic image, a primary charger establishes a primary charge on the member, the primary charge being defined by a parameter V.sub.o. An exposure device imagewise modulates the primary charge to form an electrostatic image on the recording member. The device has an exposure parameter E.sub.o. A developer station develops the electrostatic image with charged toner. The developer station has an electrical bias to establish a field for urging movement of the toner to the member. The electrical bias has an alternating current component parameter AC and a direct current parameter DC. A controller controls adjustments to the parameters E.sub.o, V.sub.o and AC by measuring a density parameter D.sub.OUT of an exposed and developed area on the member that is formed by operation of the primary charger, the exposure device and the developer station. The controller includes a calculator for calculating an error, .DELTA.D.sub.OUT in the measured density parameter from a density setpoint and multiplying .DELTA.D.sub.OUT by respective first, second and third constants to obtain respective adjustment values used for adjusting E.sub.o, V.sub.o and AC and wherein in repeated use of the controller to provide repeated adjustment values used for adjusting E.sub.o, V.sub.o and AC a fixed ratio is maintained between said first, second and third constants. The controller is also suited to providing adjustments to DC using a fourth constant.
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Regelsberger Matthias H.
Rushing Allen J.
Brase Sandra L.
Eastman Kodak Company
Rushefsky Norman
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