Determining the operational status of a printhead

A system and method for determining the operational status of a nozzle in an inkjet printhead having a piezoelectric actuator. The system comprising: a driving circuit configured to apply a driving signal to the piezoelectric actuator during a first time period; and a sensing circuit configured to m...

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Bibliographische Detailangaben
1. Verfasser:	Fernando Rodriguez-Llorente
Format:	Patent
Sprache:	eng
Schlagworte:	CORRECTION OF TYPOGRAPHICAL ERRORS i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME LINING MACHINES PERFORMING OPERATIONS PRINTING SELECTIVE PRINTING MECHANISMS STAMPS TRANSPORTING TYPEWRITERS
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Beschreibung
Zusammenfassung:	A system and method for determining the operational status of a nozzle in an inkjet printhead having a piezoelectric actuator. The system comprising: a driving circuit configured to apply a driving signal to the piezoelectric actuator during a first time period; and a sensing circuit configured to measure the current within the piezoelectric actuator as a function of time during a second time period after the first time period; wherein the system determines the operational status of the nozzle in dependence on the time taken for the measured current to reach a predetermined condition during the second time period. Also disclosed is a system and method for determining the operational status of a nozzle in dependence on the slope of the measured current as a function of time during the second time period.