Electrographic printing device
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United States of America Patent
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Jan 11, 1994
Grant Date -
N/A
app pub date -
May 17, 1991
filing date -
May 17, 1991
priority date (Note) -
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Abstract
An electrographic printhead is operated to focus charged particles on a print member. In one embodiment successive electrodes are maintained at potentials that define increasing electric field strengths in the successive regions along the particle trajectory. In another embodiment, a thick electrode face defines equipotential lines that shape a sharply focusing electrostatic field that penetrates the projection apertures of the printhead. Improved focusing diminishes charge spreading effects, and allows effective positioning of the printhead at greater spacings to reduce the risk of arcing without loss of print resolution.
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