ULTRASONIC TRANSDUCER AND MULTI-FEED DETECTION SENSOR

摘要

The present invention achieves an ultrasonic transducer that has a structure suitable for use in the high-frequency band, and that is less likely to be affected by capacitive coupling noise. The ultrasonic transducer (1) is provided with a transducer (11) and metal terminals (5, 6). The transducer (11) is provided with a matching layer (11A) and a piezoelectric element layer (11B). The piezoelectric element layer (11B) is formed by alternately layering electrode layers (11D1-11D5) of which there are an odd number and piezoelectric body layers (11C1-11C4) of which there are an even number, and performs thickness vibration. Electrode layers (11D1, 11D3, 11D5) that are provided at odd-numbered positions in the layering order are connected to a reference potential via the metal terminal (5). Electrode layers (11D2, 11D4) that are provided at even-numbered positions in the layering order are connected to a signal potential via the metal terminal (6).