Photocopying – Projection printing and copying cameras – Combined with or convertible to a contact printer
Patent
1983-06-27
1985-08-06
Moses, R. L.
Photocopying
Projection printing and copying cameras
Combined with or convertible to a contact printer
355140, 118708, 324 72, G03G 904
Patent
active
RE0319643
ABSTRACT:
An automatic control system for the bias on a development electrode in which a plurality of ground-insulated, narrow floating electrodes are spaced along a line adjacent the entrance of a liquid developer applicator unit. The floating electrodes relatively scan image areas of the surface of an organic photoconductor carried by a conductive support moving through the developer unit. Owing to conduction of a charge from the photoconductive surface through the developer liquid to the floating electrodes, they assume potentials each of which is a function of the average potential of the image area subtended by the floating electrode. The potential of each floating electrode is sensed by a high input impedance measuring circuit which selects the potential of the lowest value, amplifies the selected potential and applies the amplified voltage to the biasing electrode or electrodes of the developer system.
A fully charged and unexposed area of the surface following the image area produces a reverse bias which cleans the biasing electrodes as the fully charged area passes through the developer system.
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Gardiner Kenneth W.
Schaefer Louis F.
Moses R. L.
Savin Corporation
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