Incremental printing of symbolic information – Ink jet – Controller
Patent
1994-03-11
1996-03-05
Hartary, Joseph W.
Incremental printing of symbolic information
Ink jet
Controller
347 14, 347189, 347194, B41J 205
Patent
active
054971748
ABSTRACT:
An apparatus and method compensates for a voltage drop of electrical pulse signals selectively applied to a plurality of heater elements on a printhead of an ink jet printing device. A number of heater elements to be pulsed at a given time is determined and a time duration of each of the pulse signals is selected based on information including the determined number of heater elements to be pulsed. In another aspect, the position on the printhead of the heater elements to be pulsed is determined and the time duration of the pulse signals is selected further based on the determined position. By varying the time duration of the pulse signals applied to the heater elements, a voltage drop across the heater elements due to the number of heater elements simultaneously pulsed and/or the position of the heater elements on the printhead is compensated for, maintaining reliable jetting performance while minimizing the voltage by which operating printing voltage needs to exceed the threshold printing voltage.
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Becerra Juan J.
Courtney Thomas P.
John Peter J.
Kneezel Gary A.
LaDonna Richard V.
Hartary Joseph W.
Xerox Corporation
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