LIQUID DISCHARGING APPARATUS

摘要

An ink jet printer is provided with a piezoelectric element which is provided corresponding to a pressure chamber in order to discharge liquid droplets, a driving signal generating section which generates a driving signal, a residual vibration detecting section which detects changes in an electromotive force of the piezoelectric element in accordance with the residual vibration inside the pressure chamber which occur after the driving signal is applied, a first switch which switches whether or not a driving signal is applied to the piezoelectric element, and a second switch which switches whether or not a change in the electromotive force is supplied to a first high-pass filter, where the second switch and the residual vibration detecting section are connected via a first capacitor of the first high-pass filter.

主权项

1. A liquid discharging apparatus comprising:
a nozzle which discharges liquid droplets; a pressure chamber which communicates with the nozzle; a piezoelectric element which is provided corresponding to the pressure chamber in order to discharge liquid droplets; a driving signal generating section which generates a driving signal for driving the piezoelectric element; a first high-pass filter which includes a first capacitor and a first resistor; a residual vibration detecting section which detects changes, in an electromotive force of the piezoelectric element in accordance with the residual vibration inside the pressure chamber, which occur after the driving signal is applied; a first switch which is arranged so as to be able to switch whether or not the driving signal is applied to the piezoelectric element; a second switch which is arranged so as to be able to switch whether or not a change in the electromotive force is supplied to the first high-pass filter; a first node which electrically connects the piezoelectric element, the first switch, and the second switch; a second node which electrically connects the driving signal generating section and the first switch; and a third node which electrically connects the second switch and the first high-pass filter, wherein changes in the electromotive force which are detected by the residual vibration detecting section are based on a first output signal which is passed through the first high-pass filter.