Patent ID: 7429093
Filing Date: 2008-09-30
Classification: B41J

Abstract:
1. A droplet discharging device comprising: a head unit including: a driving unit for outputting a driving signal to drive each of the piezoelectric actuators of the droplet discharging heads; a nozzle selecting unit for selecting each of the nozzles of the droplet discharging heads and supplying the driving signal from the driving unit to the piezoelectric actuator corresponding to the nozzle thus selected; a residual vibration detecting unit for detecting a residual vibration of the vibrating plate connected to each of the piezoelectric actuators; a first switch unit having a first current capacitance which can connect an electrode on a ground side of the piezoelectric actuator and the ground; a second switch unit having a second current capacitance which can connect the electrode on the ground side of the piezoelectric actuator and the ground; and a switch control unit for carrying out a predetermined opening and closing control of each of the first switch unit and the second switch unit when detecting a discharge abnormality of the nozzle, wherein said first current capacitance is greater than said second current capacitance.