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Brief description of the drawings
FIG. 1 is a perspective view of a first embodiment of the present invention, and FIG. 3 is a side
view of each of the second, third and fourth embodiments of the present invention, and FIG. 3 is
a diagram showing frequency response characteristics of the embodiment of the present
invention and the prior art. 1: Piezoelectric body 2, 21 to 25: Matching layer, 3: Backing layer.