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US 4,734,705 AGranted
Ink jet printer with satellite droplet control
AssigneeXerox Corporation
InventorsIvan Rezanka, Joseph M. Crowley
Life of this patent
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AssigneeXerox Corporation
InventorsIvan Rezanka, Joseph M. Crowley
Estimating the term…
An externally stimulated continuous stream ink jet printer which suppresses or controls the formation of satellite droplets so that they are not charged differently from the main droplets. Thus, when the two are merged, indeterminate charges are not produced which would impact the print quality of the printer. The satellites are suppressed by impressing on the printer ink streams a combination of time-varying pressures. In one embodiment, the time-varying pressures are generated by two time-varying voltages applied to the EHD electrodes. One pressure has a fundamental frequency with the second pressure having a second harmonic frequency, these two pressures having a predetermined phase and amplitudes with respect to each other. The fundamental frequency is selected for a required drop spacing to stream diameter ratio.
An improved continuous stream-type pagewidth ink jet printer of the type having a pressurized ink filled manifold with a nozzle plate containing a plurality of nozzles from which ink streams are emitted, the ink streams being externally stimulated by a time varying pressure to cause them to break up into droplets at a predetermined distance from the nozzles whereat the droplets are charged in accordance with digitized data signals, the charged droplets following flight paths through an electrostatic field to specific pixel locations on a recording medium, wherein the improvement comprises:
A method of suppressing or controlling the formation of satellites in a continuous stream type ink jet printer comprising:
Dependencies are inferred from the claim text.