Gray scale printhead system

Details Gray scale printhead system Gray scale printhead system

1990-05-04

1991-02-12

Miller, Jr., George H.

Recorders

Electric recording

Electrochemical

G01D 1506

Patent

active

049928074

ABSTRACT:
An electrographic printhead assembly comprises first and second sets of electrodes which define an array of crossing regions for generating packets of electric charge. An RF electrode burst actuates a first electrode to generate charge carriers while a varying extraction potential is developed. A second electrode is then activated with one or more control pulses which are synchronized with the RF burst and with selected portions of the varying extraction potential to gate charge carriers from the printhead. This deposits the desired charge level for each dot on an imaging member. The assembly forms a gray scale latent image for printing, and provides enhanced range without requiring higher frequency or longer duration RF bursts.

REFERENCES:
patent: 4658275 (1987-04-01), Fujii et al.
patent: 4697196 (1987-09-01), Inaba et al.
patent: 4819013 (1989-04-01), Beaudet

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