Patent ID: 10600951

Abstract:
A vibrating plate is provided between a substrate and a piezoelectric element formed of electrodes and a piezoelectric layer and includes a first layer which is formed of a silicon oxide and a second layer which is formed of a ceramic having a Young's modulus larger than that of the silicon oxide. Under the condition in which the following expression (1) has a constant value, where in the expression (1), Ev1, dv1, Ev2, and dv2 represent Young's modulus of the first layer, the thickness thereof, Young's modulus of the second layer, and the thickness thereof, Ev1×dv12+Ev2×dv22  (1) when the combination of dv1 and dv2 which sets the value of the following expression (2) in a range of from the minimum value to +2% thereof is represented by (Dv1, Dv2), Ev1×dv13+Ev2×dv23  (2) the thickness of the first layer and the thickness of the second layer are represented by Dv1 and Dv2.