Patent ID: 7573181

Claim:
A multilayer piezoelectric substrate assembly, comprising: a first piezoelectric substrate having a first electrode layer formed on a first and a second main surface and a first and a second side surface thereof, the first piezoelectric substrate having a first and a second discontinuity on the first and the second main surface to divide the first electrode layer into a first electrode and a second electrode isolated from each other; and a second piezoelectric substrate having a second electrode layer formed on a first and a second main surface and a first and a second side surface thereof, the second piezoelectric substrate having a third and a fourth discontinuity to divide the second electrode layer into a third and a fourth electrode isolated from each other, the third discontinuity being formed on the first main surface, with the fourth discontinuity being an abraded edge portion, wherein the first and the second piezoelectric substrates are coupled each other such that the second and the third discontinuities are faced each other, to thereby form a first electrode node and a second electrode node, the first electrode node having the first and the third electrodes and the second electrode node having the second and the fourth electrodes.