Toner ejection printer with dummy electrode for improving print

Details Toner ejection printer with dummy electrode for improving print Toner ejection printer with dummy electrode for improving print

1995-10-26

1997-01-21

Grimley, Arthur T.

Incremental printing of symbolic information

Ink jet

Ejector mechanism

G03G 1500

Patent

active

055963560

ABSTRACT:
The present invention provides a method and apparatus for toner ejection printing that improves print quality by providing a pair of dummy electrodes positioned adjacent to the end shield electrodes, the dummy electrodes for improving print uniformity by maintaining a consistent charge environment for the aperture currently printing. The image recording apparatus is comprised of a developer supply for providing electrostatically charged toner particles, a printhead structure, the printhead structure having a first major surface and a second opposite major surface, wherein a plurality of gate electrodes B.sub.1, . . . B.sub.n-1,B.sub.n are formed on the first major surface of the printhead structure, a plurality of shield electrodes C.sub.1, . . . C.sub.m-1,C.sub.m are formed on the second major surface of the printhead structure, and at least a first dummy electrode X.sub.p is formed on the second major surface adjacent to electrode C.sub.m, the printhead structure including a plurality of apertures extending from the gate electrodes B.sub.1, . . . B.sub.n-1,B.sub.n to corresponding shield electrodes C.sub.1, . . . C.sub.m-1,C.sub.m, a back electrode disposed in opposed relation with a surface of the printhead structure, and a control circuit for applying controlled electrical signals to the printhead structure, the electrical signals causing the electrostatically charged toner particles to flow through selected apertures towards the back electrode.

REFERENCES:
patent: 3689935 (1972-09-01), Pressman et al.
patent: 5353050 (1994-10-01), Kagayama

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