Patent ID: 7105988

Claim:
A piezoelectric device comprising: a supporting substrate; a first conductive trace on a first surface of the supporting substrate; a second conductive trace on the first surface of the supporting substrate and spaced from the first conductive trace; a third conductive trace on a second surface of the supporting substrate; a fourth conductive trace on the second surface of the supporting substrate and spaced from the third conductive trace; a first piezoelectric material layer having first and second surfaces, the first surface of the first piezoelectric material layer being secured to the first surface of the supporting substrate and electrically connected to the second conductive trace, the second surface of the first piezoelectric material layer being electrically connected to the first conductive trace; a second piezoelectric material layer having first and second surfaces, the first surface of the second piezoelectric material layer being secured to the second surface of the supporting substrate and electrically connected to the fourth conductive trace, the second surface of the second piezoelectric material layer being electrically connected to the third conductive trace; a first protective coating extending over at least the second surface of the first piezoelectric material layer so that at least a portion of the first and second conductive traces are exposed; and a second protective coating extending over at least the second surface of the second piezoelectric electric material layer so that at least a portion of the third and fourth conductive traces are exposed.