Patent ID: 9199450
Filing Date: 2015-12-01
Classification: B41J

Abstract:
1. A liquid discharge apparatus comprising: a head having a piezoelectric element configured and arranged to vibrate a diaphragm, a pressure chamber where an interior pressure is increased or decreased by vibration of the diaphragm, and a nozzle communicating with the pressure chamber and configured and arranged to discharge a liquid inside the pressure chamber according to increasing and decreasing of the interior pressure of the pressure chamber; a drive unit configured and arranged to output a drive signal to the piezoelectric element such that the drive signal becomes a first potential during a first period, becomes a second potential during a second period following the first period, and becomes a third potential, which is a potential between the first potential and the second potential, during a third period following the second period; a detection unit configured and arranged to detect a residual vibration inside the pressure chamber that is produced by the drive signal; and a control unit configured to modify the potential of the third potential of the drive signal within a range between the first potential and the second potential.