Patent ID: 8628174
Filing Date: 2014-01-14
Classification: B41J,H01L,Y10T

Abstract:
1. A piezoelectric element comprising: a supporting body; a lower electrode that is formed over the supporting body; a piezoelectric layer that is formed over the lower electrode; and an upper electrode that is formed over the piezoelectric layer so as to oppose the lower electrode via the piezoelectric layer, the piezoelectric layer including a first portion at a lower electrode side and a second portion at an upper electrode side, a step portion being formed at a peripheral portion of the first portion of piezoelectric layer such that a surface of the piezoelectric layer at the lower electrode side is larger than a surface of the piezoelectric layer at the upper electrode side, the step portion having a top surface substantially parallel to the lower electrode, a side surface of the step portion at a first substantially constant angle θ