Patent ID: 6932464

Claim:
A piezoelectric actuator manufacturing method, comprising: a first process for forming a multi-layer plate, the first process comprising: laminating an upper electrode layer formed of conduction material on one surface of a piezoelectric layer formed of piezoelectric material; laminating a vibration layer on the other surface of said piezoelectric layer through a lower electrode layer formed of conduction material; and laminating and forming a reinforcement layer having a prescribed strength in which openings having prescribed sizes and shapes are provided on one surface side or the other surface side of said multi-layer plate together with said multi-layer plate; a second process for processing said multi-layer plate; and a third process for separating a part of said multi-layer plate that is exposed from said openings of said reinforcement layer from the other part of said multi-layer plate, wherein a voltage is placed across a face surface portion of the electrode layers, which are on opposite sides of the multi-layer plate, such that layer is polarized in a direction of the thickness of the layer.