专利名称：Ink jet printing apparatus correctional in
drop placement errors
发明人：John D. Lewis,Michael R. Keeling,David R.
Bowen,Anthony D. Paton
申请号：US06/521169申请日：19830808公开号：US04551731A公开日：19851105
摘要：An ink jet array printer has at least one row of printing guns. The guns depositdrops which are charged and deflected for printing on a printing surface movingrelatively to the printer in line sections which together form a transverse printing line.The charging of the drops is effected by applying to the charge electrode of each gun,under the control of printing information, a periodic voltage waveform of sufficientperiod to span a raster of successively formed drops which are employed for printing thecorresponding line section, the printing lines being successively formed at the frequencyof the voltage waveform. Detector means are provided which sense values representativeof drop placement errors of jets of test drops in the direction of relative movement ofthe printer and printing surface and control means responsive to the sensed values areoperative to advance or retard the application to the charge electrode of each printinggun of the periodic voltage waveform thereby to correct for said drop placement errors.
申请人：CAMBRIDGE CONSULTANTS LIMITED
代理机构：Browdy and Neimark
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