Copy contrast and density control

Details Copy contrast and density control Copy contrast and density control

G - Physics

03

G

314/28

G03G 15/00 (2006.01)

Patent

CA 1153790

COPY CONTRAST AND DENSITY CONTROL ABSTRACT OF THE DISCLOSURE Disclosed herein is a method and apparatus for controlling the contrast, density and solid area development of copies produced by an electrophotographic copier. The method involved the steps of (a) storing a matrix of sets of representations of interrelated values (e.g., initial level of voltage Vo applied to the recording element, the amount of imagewise exposure Eo and bias voltage VB applied to a development electrode), each set defining a dif- ferent predetermined DIN/DOUT response curve for the copier, (b) addressing the stored matrix to designate a particular set and (c) adjusting the interrelated values (Vo, Eo and VB) in accordance with the designated set. The apparatus includes memory means for storing the aforementioned matrix, manually settable selector means for addressing a particular matrix set, and logic and control means for adjusting the interrelated values in response to the setting of the selector means.

373635

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