Liquid ejection apparatus
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United States of America Patent
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-
Dec 15, 2015
Grant Date -
Sep 17, 2015
app pub date -
Mar 12, 2015
filing date -
Mar 14, 2014
priority date (Note) -
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status (Latency Note)
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Abstract
A printing apparatus includes a cavity in which a pressure inside is increased or decreased due to displacement of a piezoelectric element; a nozzle that communicates the cavity and is capable of ejecting an ink filled in the inside; a driving signal generation unit that supplies a driving signal to the piezoelectric element; a detection unit that detects a change of an electromotive force of the piezoelectric element as a residual vibration signal; a comparison signal generation unit that generates a first comparison signal by binarizing the residual vibration signal with a first threshold potential and generates a second comparison signal by binarizing the residual vibration signal with a second threshold potential; and a determination data generation unit that determines an ejection state of a liquid in the nozzle based on at least the first comparison signal and the second comparison signal.
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