Incremental printing of symbolic information – Ink jet – Controller
Patent
1995-04-20
1999-10-19
Le, N.
Incremental printing of symbolic information
Ink jet
Controller
347 19, B41J 2938, B41J 29393
Patent
active
059697296
ABSTRACT:
An ink on demand type ink jet head energization system is provided to drive ink out of a nozzle in the head. The head contains at least one nozzle for discharging ink. The power applied to the nozzle is modified to include a noise component. By providing a driving voltage which varies between firings, the head produces ink droplets which differ in size between firings. Preferably, the voltage is randomly or pseudo-randomly varied over a range of from 50 to 100% of maximum voltage, and a new voltage is provided for each successive firing of the head. This variation of drive voltage produces ink dots which randomly vary in size at a rate too dense to be perceived by a viewer, and successfully reduces perceived artifacts in the printed output.
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Bennefeld David H.
Erickson Paul R.
Novotny John P.
Anderson L.
Colorspan Corporation
Le N.
McDowall Paul H.
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