Patent ID: 7628462

Claim:
A droplet discharge device comprising: a pressure chamber storing liquid to be discharged; an actuator applying pressure to the liquid within the pressure chamber when the actuator receives a signal; a nozzle connected to the pressure chamber and discharging a droplet when the actuator receives the signal; and a driver that transmits the signals sequentially to the actuator within a period of discharging droplets toward a target position, wherein when a number of the signals transmitted by the driver to the actuator within the period is greater than or equal to three signals, consecutive three signals transmitted by the driver satisfy the following condition: a first interval between a first signal and a second signal of the consecutive three signals is substantially equal to a product of an integer and a cycle time of a pressure wave generated within the pressure chamber, wherein the integer is two or more, and a second interval between the second signal and a third signal of the consecutive three signals is substantially equal to the cycle time, wherein each of the consecutive three signals corresponds to a transition from a lower voltage to a higher voltage.