Printing apparatus and method of controlling printing apparatus

摘要

A printing apparatus includes an ejection unit including a piezoelectric element that is displaced according to a driving signal, and a nozzle capable of ejecting the liquid; a driving signal supply unit that supplies the driving signal; a detection unit that detects change of an electromotive force of the piezoelectric element; a determination unit that determines an ejection state of the liquid in the ejection unit based on the detection result of the detection unit; and a decision unit that is capable of performing a first process of deciding a waveform of the driving signal for inspection such that the liquid is not ejected from the nozzle when the driving signal for inspection is supplied to the piezoelectric element and a second process of correcting the waveform decided in the first process and deciding the corrected waveform as a waveform of the driving signal for inspection.

主权项

1. A printing apparatus, comprising:
an ejection unit that includes
a piezoelectric element that is displaced according to a driving signal,a pressure chamber whose inside is filled with a liquid and in which a pressure inside is increased or decreased by the displacement of the piezoelectric element based on the driving signal, anda nozzle that communicates with the pressure chamber and capable of ejecting the liquid filled into the inside of the pressure chamber through the increase or decrease of the pressure in the inside of the pressure chamber; a driving signal supply unit that supplies the driving signal to the piezoelectric element; a detection unit that detects change of an electromotive force of the piezoelectric element as a residual vibration signal based on the change of the pressure in the inside of the pressure chamber, which is generated after the driving signal is supplied to the piezoelectric element; a determination unit that determines an ejection state of the liquid in the ejection unit based on the detection result of the detection unit in a case where the driving signal for inspection is supplied to the piezoelectric element; and a decision unit that is capable of performing a first process of deciding a waveform of the driving signal for inspection such that the liquid is not ejected from the nozzles when the driving signal for inspection is supplied to the piezoelectric element and a second process of correcting the waveform decided in the first process and deciding the corrected waveform as a waveform of the driving signal for inspection, wherein, in the second process, the decision unit decides the corrected waveform such that the liquid is not ejected from the nozzles when the driving signal for inspection which has the corrected waveform is supplied to the piezoelectric element.