PROBLEM TO BE SOLVED: To provide an ultrasonic transducer which is simply constructed to prevent its electrode from corrosion without reducing sonic power of an ultrasonic wave.SOLUTION: The ultrasonic transducer 30 includes a piezoelectric device 40 in which a piezoelectric body 43 is sandwiched between an upper electrode 44 and a lower electrode 45, wherein the upper electrode 44 has the upper surface the end of which is covered with a wire protection layer 47, and also has all the other surfaces covered with a sonic adjustment layer 41 and a corrosion-proofing layer 49 is disposed just beneath the boundary between the sonic adjustment layer 41 and the wire protection layer 47 to prevent an electric material-corrosive factor from penetrating.COPYRIGHT: (C)2010,JPO&INPIT【課題】簡単な構成で、超音波の音響パワーを低下させることなく、超音波トランスデューサの電極の腐食を防止する。【解決手段】超音波トランスデューサ30は、圧電体43の上下を上部電極44及び下部電極45で挟んだ圧電素子40を備えている。上部電極44の上面は、端部が配線保護層47で覆われており、残りの全ての部分が音響整合層41で覆われている。この音響整合層41と配線保護層47の境界の直下には、電気的部材の腐食因子を透過させない腐食防止層49が設けられている。【選択図】図3
