METHOD FOR EVALUATING A STATUS OF AN INKJET PRINT HEAD

A method is provided to determine a droplet ejection state of a pressure chamber of a piezo-actuated inkjet print head, the method comprising a step of analyzing that includes filtering a residual pressure wave signal using a predetermined filter. The filter is designed to remove a low-frequency sig...

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Bibliographische Detailangaben
Hauptverfasser:	JANSSEN DOMINICUS P.C, SIMONS JOHANNES M.M, KHALATE AMOL A, VAN WELIE ALBERT G.M
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 method is provided to determine a droplet ejection state of a pressure chamber of a piezo-actuated inkjet print head, the method comprising a step of analyzing that includes filtering a residual pressure wave signal using a predetermined filter. The filter is designed to remove a low-frequency signal contribution generated by piezo material of the piezo actuator. Such a low-frequency signal contribution results from a piezo material property that varies over all piezo actuators without affecting the functional properties of the piezo actuator. Hence, for controlling the operation of the inkjet print head, in particular for controlling a droplet size and a droplet speed, such a signal contribution may be removed enabling a simple and nozzle-independent analysis of the residual pressure wave signal.