ULTRASONIC HANDSET AND UNDERWATER DETECTOR

PROBLEM TO BE SOLVED: To suppress grating lobes in the vertical direction, and to minimize directivity deviations by devising the arrangement of a vibrator in a handset, comprising a cylindrical section and a hemispherical section. SOLUTION: The vibrator 10a is arranged so that six vibrators adjacent to one vibrator are positioned at each apex of a regular hexagon 8 in the cylindrical section 1A, and a set of facing sides 9 of the regular hexagon 8 are arranged so that they face a perpendicular direction. When a figure, obtained by projecting a regular pentagon for composing a regular dodecahedron inscribed to the spherical surface of the hemispherical section 1B, is set to be a spherical pentagon 5 in the hemispherical section 1B, a vibrator 10b is arranged at the apex of the spherical triangle 6 for constituting the components of the spherical pentagon 5, a point for equally dividing each side of the spherical triangle 6, and the center of gravity of a small spherical triangle formed by an arc for connecting the equal division points. COPYRIGHT: (C)2006,JPO&NCIPI