| 摘要 |
PROBLEM TO BE SOLVED: To solve the problem wherein an ultrasonic wave transceiver using a conventional cylindrical case with a bottom is damaged with external stress and its sensor characteristics are deteriorated. SOLUTION: In an ultrasonic wave transceiver, at least one layer of elastic high molecular material (silicon, urethane, or synthetic rubber, etc.) of Poisson's ratio 0.45 to 0.49 with a thickness of 0.1 mm or more and 1.5 mm or less is prepared, as coated films applied to a vibration plane of a cylindrical resin case with a bottom. The total thickness of coated films on the vibration plane is set to 1.6 mm or less to secure ultrasonic wave transmission/reception. Thereby, external stress can be eased, and deterioration in sensor characteristics can be prevented. COPYRIGHT: (C)2009,JPO&INPIT
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