Patent ID: 8305074

Claim:
A magnetostrictive transducer comprising: a magnetostrictive patch that is attached to a surface of a plate member and has a plane fan-shape; a static magnetic field forming unit comprising two magnets that are respectively installed on both sides of the magnetostrictive patch so that a magnetic field is formed in parallel to an arc direction of the magnetostrictive patch; and a dynamic magnetic field forming unit comprising a wound coil comprising a plurality of curved portions, wherein each of the curved portions of the dynamic magnetic field forming unit has a shape that extends in parallel to an arc direction and corresponds to each of divided portions of the magnetostrictive patch in a parallel direction to an arc of the magnetostrictive patch, and the curved portions are separated apart from one another in a radius direction with respect to a center point of the magnetostrictive patches, and a direction in which the coil is wound differs between the curved portions that are adjacent to another, and thus a direction of a magnetic field formed by the coil differs between the adjacent curved portions when current flows through the coil.