G - Physics – 01 – D
Patent
G - Physics
01
D
101/96.0201
G01D 15/18 (2006.01)
Patent
CA 1242355
Abstract of the Disclosure An ink jet printer including a drop deflecting arrangement for directing drops from a jet drop stream to a plurality of print positions on a print receiving medium. The printer includes a print head which produces at least one jet drop stream directed generally toward the print receiving medium. The stream emerges from the print head as an electrically grounded fluid filament which then breaks up into drops. A pair of electrodes is positioned on opposite sides of the fluid filament above the point of drop formation and extends along the path of the jet drop stream for a substantial distance. A means is provided for supplying first and second deflection potentials of equal magnitude but opposite polarity to the electrodes such that a deflection field, normal to the path of the jet drop stream, is produced. The ground plane of the field is aligned with the fluid filament so that drops produced are not charged. The deflection potentials are then shifted up or down to maintain the deflection field substantially constant while altering the field potential in the region of the filament. By this technique, drops which are passing through the deflection field receive a substantially constant deflection force in dependence upon the charge level which they carry, and selective charging of drops is accomplished simultaneously with the field.
487877
Gowling Lafleur Henderson Llp
The Mead Corporation
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