Patent ID: 8608292
Filing Date: 2013-12-17
Classification: B41J

Abstract:
1. A liquid jet head comprising: a flow channel forming plate having a pressure generation chamber to communicate with a nozzle ejecting liquid droplets; and a piezoelectric element provided above one surface of the flow channel forming plate, the piezoelectric element having a lower electrode, a piezoelectric material layer, and an upper electrode, wherein the lower electrode comprises a portion disposed in a region corresponding to the pressure generation chamber, and the portion of the lower electrode has a width smaller than the width of the corresponding pressure generation chamber, and an upper surface and an end surface of the portion of the lower electrode in a direction of the width are covered with the piezoelectric material layer, and the piezoelectric material layer is covered with the upper electrode, and the piezoelectric material layer in the region corresponding to the pressure generation chamber has a sloped portion along the end surface of the portion of the lower electrode, and the relationship between a thickness D