SHORT CIRCUIT DETECTION IN AN INKJET PRINTHEAD

A short detection apparatus, system and method detect short circuits in an inkjet printhead using a comparison of measured current consumption and an estimate of current consumption based on print data. The apparatus includes a current sensor to measure current consumed by the printhead to eject a d...

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Bibliographische Detailangaben
Hauptverfasser:	CARROBE MIRIAM LLORENS, RODRIGUEZ JOSE MIGUEL, ESPASA CESAR FERNANDEZ
Format:	Patent
Sprache:	eng
Schlagworte:	BASIC ELECTRIC ELEMENTS CORRECTION OF TYPOGRAPHICAL ERRORS ELECTRIC SWITCHES ELECTRICITY EMERGENCY PROTECTIVE DEVICES i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME LINING MACHINES MEASURING MEASURING ELECTRIC VARIABLES MEASURING MAGNETIC VARIABLES PERFORMING OPERATIONS PHYSICS PRINTING RELAYS SELECTIVE PRINTING MECHANISMS SELECTORS STAMPS TESTING TRANSPORTING TYPEWRITERS
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Beschreibung
Zusammenfassung:	A short detection apparatus, system and method detect short circuits in an inkjet printhead using a comparison of measured current consumption and an estimate of current consumption based on print data. The apparatus includes a current sensor to measure current consumed by the printhead to eject a droplet of ink, a current estimator to estimate a current consumption of the printhead due to print data provided to the printhead, and a comparator to compare the measured consumed current to the estimated consumed current. A short circuit in the printhead is indicated when the comparison exceeds a predetermined threshold.