Patent ID: 9636907
Date: 2017-05-02
CPC Classifications: B41J

Claim:
1. A liquid discharge apparatus comprising: a discharge unit including a piezoelectric element that is displaced in response to a drive signal, a pressure chamber of which an inner pressure is increased or decreased by the piezoelectric element, and a nozzle which is in communication with the pressure chamber and discharges liquid filling the pressure chamber, depending on an increase or a decrease in the inner pressure of the pressure chamber; a detection unit that detects residual vibration occurring in the discharge unit according to a potential change of the drive signal that is supplied to the piezoelectric element; and a determination unit that determines a discharge state of the liquid in the discharge unit, depending on a detection result of the detection unit, the detection unit outputting the determination unit determining the discharge state of the liquid in the discharge unit, based on the first detection signal and the second detection signal.