Modulation waveform amplitude adjustment in a multi-nozzle printhead based on charge signal phase relationships
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United States of America Patent
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Dec 4, 2001
Grant Date -
N/A
app pub date -
Mar 20, 2000
filing date -
Dec 23, 1996
priority date (Note) -
Expired
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Abstract
A method for adjusting the amplitude of the pressure modulation waveform in a multi-nozzle continuous jet printhead having a pressure modulator for causing streams of ink emitted from the nozzles to be broken up into individual droplets, and charge electrodes and change electrode controllers for controllably applying a charge to individual ones of the droplets in each stream. The method involves generating a modulation waveform to operate the pressure modulator to cause droplets to be generated in each stream, operating the charge controllers to supply a charge signal waveform to each charge electrode; and periodically determining the phase relationship between the charge signal waveforms applied by the charge controllers and the pressure modulation waveform to achieve satisfactory charging of the droplets, determining the spread of the phase relationships to achieve satisfactory charging of the droplets, and thereafter incrementally adjusting the amplitude of the pressure modulation waveform upwardly or downwardly to optimize the break-up length of the droplet streams.
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