| 摘要 |
PROBLEM TO BE SOLVED: To provide an ultrasonic wave transceiver capable of preventing misdetection due to ground or the like in the case of detecting a longer distance as compared with a conventional case. SOLUTION: In the ultrasonic wave transceiver constituting a unimorph vibrator of sticking a piezoelectric element to the inside of a bottom of a bottomed cylindrical case on which a ditch having comparatively longer width B in one direction and comparatively shorter width A in the other direction is formed and transmitting/receiving ultrasonic waves on the outer surface of the case of the vibrator, an aperture part whose size does not exceed the width A is formed on the comparatively shorter side side-face of the bottomed cylindrical case, so that directivity is more narrowed as compared with a conventional apparatus. COPYRIGHT: (C)2007,JPO&INPIT
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