Patent ID: 7666152

Claim:
An acoustic wave device comprising: an acoustic wave transducer adapted to generate an acoustic wave in a propagation liquid, said acoustic wave transducer having an inner contour defined by rotating a curve about a rotation axis of symmetry, wherein the curve and the acoustic wave are not parallel to the rotation axis of symmetry; and a focusing lens arranged with respect to said acoustic wave transducer so as to focus the acoustic wave emanating from said acoustic wave transducer to a focal point, wherein said focusing lens at least partially circumscribes said rotation axis of symmetry and has an inner contour that defines an inner volume, which is axisymmetric about said rotation axis of symmetry and is at least partially filled with said propagation liquid, and has an outer volume defined by a space between an outer contour of said focusing lens and said acoustic wave transducer and which is at least partially filled with said propagation liquid, wherein said inner contour of said focusing lens is radially inwards towards said rotation axis of symmetry relative to said outer contour.