LIQUID DISCHARGE DEVICE AND CONTROL METHOD OF LIQUID DISCHARGE DEVICE

To prevent liquid droplets from being discharged unstably.SOLUTION: A liquid discharge device comprises a plurality of discharge parts including a nozzle, a pressure chamber and a driving element, and a signal generating part that generates a driving signal for making the nozzle discharge a plurality of liquid droplets integrally until the liquid droplets impact on a medium. The driving signal includes a plurality of drive waveforms and a first connection waveform connecting the last drive waveform to the second drive waveform from the last, of the plurality of drive waveforms so that a potential of the drive signal is maintained at a reference potential. Each of the plurality of drive waveforms includes an expand waveform which expands volumes of the pressure chamber so that the potential of the drive signal varies from the reference potential and a constricting waveform that constricts volumes of the pressure chamber expanded by the expand waveform so that the potential of the drive signal varies so as to make the nozzle discharge liquid droplets. Pressure fluctuation of liquid in the pressure chamber caused by the constricting waveform is larger in the last drive waveform than in the second waveform from the last, and a period of the first connection waveform is 0.8 times or more natural vibration periods of the discharge parts.SELECTED DRAWING: Figure 6 【課題】液滴の吐出が不安定になることを抑制する。【解決手段】液体吐出装置は、ノズル、圧力室及び駆動素子を含む複数の吐出部と、ノズルから複数の液滴を媒体に着弾するまでに合体するように吐出させる駆動信号を生成する信号生成部と、を備え、駆動信号は、複数の駆動波形と、複数の駆動波形のうちの最後の駆動波形と最後から２番目の駆動波形とを接続し、駆動信号の電位が基準電位に維持される第１接続波形と、を含み、複数の駆動波形の各々は、圧力室の容積を膨張させるように、駆動信号の電位が基準電位から変化する膨張波形と、膨張波形により膨張した圧力室の容積を収縮させてノズルから液滴を吐出させるように、駆動信号の電位が変化する収縮波形と、を含み、収縮波形により生じる圧力室内の液体の圧力変動は、最後から２番目の駆動波形よりも最後の駆動波形の方が大きく、第１接続波形の期間は、吐出部の固有振動周期の０．８倍以上である。【選択図】図６