Continuous bias control for electrographic development...

Details Continuous bias control for electrographic development... Continuous bias control for electrographic development...

G - Physics

03

G

32/12.09

G03G 15/09 (2006.01) G03G 15/06 (2006.01)

Patent

CA 1046268

CONTINUOUS BIAS CONTROL FOR ELECTROGRAPHIC DEVELOPMENT APPARATUS Abstract of the Disclosure Apparatus for use in an electrographic development station having a long development zone, for example, having two magnetic brushes mounted in tandem. The apparatus con- tinuously senses an electrostatic charge pattern and applies an electrical bias to the development station which corresponds to the intensity of the sensed charge. The application of the bias is delayed until the charge pattern passes the last development portion of the zone, for example, the second mag- netic brush. In a preferred embodiment, the charge pattern is sensed by an indication plate coupled to an amplifier which provides a signal to a Pade' pure time delay circuit. The delayed signal drives a high voltage bias amplifier which accordingly biases the development station. The delay is chosen to correspond to the time it takes the sensed pattern to pass the later portion of the development zone. -1-

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