Patent ID: 7781936

Claim:
A surface acoustic wave device comprising: a base substrate having a surface; a first surface acoustic wave filter mounted on the surface of the base substrate, the first surface acoustic wave filter including a first piezoelectric substrate having a first main surface facing the surface of the base substrate, and a first comb-electrode provided on the first main surface; a second surface acoustic wave filter mounted on the surface of the base substrate, the second surface acoustic wave filter including a second piezoelectric substrate located away from the first piezoelectric substrate via a gap, the second piezoelectric substrate having a second main surface facing the surface of the base substrate, and a second comb-electrode provided on the second main surface; and a sealer provided on the surface of the base substrate, the sealer covering the first surface acoustic wave filter and the second surface acoustic wave filter; wherein the first piezoelectric substrate further has a first back surface opposite to the first main surface, and a first edge surface connected to the first main surface and the first back surface; wherein the second piezoelectric substrate further has a second back surface opposite to the second main surface, and a second edge surface connected to the second main surface and the second back surface; wherein the gap is provided between the first edge surface of the first piezoelectric substrate and the second edge surface of the second piezoelectric substrate, and has a first opening and a second opening, the first opening being located between the first main surface and the second main surface, the second opening being located between the first back surface and the second back surface; and wherein a width of the gap becomes smaller from the first opening to the second opening such that the gap narrows in a direction extending away from the surface of the base substrate.