LIQUID EJECTION DEVICE

To further suppress occurrence of burn in a liquid discharge device to improve durability thereof.SOLUTION: A liquid ejection device comprises: a recording element substrate provided with an ejection port for discharging liquid and voltage applying means for applying voltages to the recording element substrate. The recording element substrate includes: a first layer member provided with the ejection port formed on a surface thereof; and a second layer member fixed to a rear surface of the first layer member. The first layer member is provided with a first passage communicating with the ejection port. The second layer member is provided with: a second passage communicating with the first passage; a heat generation resistance element positioned to oppose to the ejection port; and an electrode that covers a surface on the first layer member side of the heat generation resistance element and that is exposed toward the first passage. The voltage applying means applies voltages so that potential of the electrode is minus potential.SELECTED DRAWING: Figure 6 【課題】液体吐出装置におけるコゲの発生を一層抑制し、その耐久性を向上する。【解決手段】液体を吐出するための吐出口が設けられた記録素子基板と、記録素子基板に電圧を印加するための電圧印加手段と、を備える液体吐出装置であって、記録素子基板は、表面に吐出口が設けられた第１層部材と、第１層部材の裏面に固定された第２層部材と、を有し、第１層部材には、吐出口に連通する第１流路が設けられ、第２層部材には、第１流路に連通する第２流路と、吐出口に対向するように位置する発熱抵抗体と、発熱抵抗体の第１層部材側の表面を覆うとともに第１流路に露出する電極と、が設けられ、電圧印加手段は、電極がマイナス電位になるように電圧を印加する。【選択図】図６