Incremental printing of symbolic information – Ink jet – Controller
Patent
1995-08-28
1998-04-07
Hartary, Joseph W.
Incremental printing of symbolic information
Ink jet
Controller
347 60, B41J 205
Patent
active
057369950
ABSTRACT:
A technique for controlling print quality in an inkjet printer by delivering synchronized heating, non-printing pulses and printing pulses to the ink firing resistors during print firing operations such as during the printing of a swath. A temperature of the printhead substrate is measured and compared against a reference temperature during printing operations. If the measured temperature is below the reference temperature, then the printhead substrate is heated during the printing operations to bring the substrate up to the reference temperature. The heating is done by delivering synchronized heating non-printing pulses and printing pulses to the ink firing resistors during selected print firing periods, wherein either the heating pulses or the printing pulses, but not both, occur during a selected print firing period. The heating pulses are logically OR-ed with the printing pulses to achieve the synchronization.
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Bohorquez Jaime H.
Corrigan George H.
Yeung King-Wah W.
Hartary Joseph W.
Hewlett--Packard Company
Romney David S.
Stenstrom Dennis G.
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