| 摘要 |
PROBLEM TO BE SOLVED: To provide, at a low cost, an ultrasonic sensor capable of measuring the position and distance of an object to be detected with high precision while avoiding influence of a reverberation sound and an attenuated sound. SOLUTION: A reception section 10 comprises a pedestal 11 and receiving elements 12a to 12d which are in the same size shape and have the same constitution. The receiving elements 12a to 12d which are in the flat plate rectangular shape are arranged radially at equal angles of 45°around the center axis C of the pedestal 11 when the disk-like pedestal 11 is viewed from above. Further, the receiving elements 12a to 12d have their lengthwise one-end portions fitted and fixed on the top surface of the pedestal along the peripheral edge of the pedestal 11 at equal angles of 45°with respect to the top surface of the pedestal 11 while normals (n) of reception surfaces S of the receiving elements 12a to 12d cross one another at one point P on the center axis C of the pedestal 11 when the pedestal 11 is laterally viewed. COPYRIGHT: (C)2006,JPO&NCIPI
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