PIEZOELECTRIC CERAMIC ELEMENT AND PORTABLE DEVICE

摘要

A piezoelectric ceramic element (1) comprises an upper piezoelectric active layer (5) and a lower piezoelectric active layer (6). An upper insulating layer (2) and a lower insulating layer (3) are arranged respectively outside of the upper piezoelectric active layer (5) and the lower piezoelectric active layer (6) in the thickness direction of the piezoelectric ceramic element (1) so that the upper and lower piezoelectric active layers are interposed between the upper and lower insulating layers. Two electrode pads (8, 9) are formed on the surface of the upper insulating layer (2). The electrode pads (8, 9) are respectively connected to an upper electrode layer (7a) and a lower electrode layer (7b) via a wire-connecting member (12), and a voltage is applied from the electrode pads (8, 9) to the upper piezoelectric active layer (5) and the lower piezoelectric active layer (6). The insulating layers (2, 3, 4) and the piezoelectric active layers (5, 6) are made of the same material and integrated with one another through firing.