PROBLEM TO BE SOLVED: To provide a compact ultrasonic transducer where lead wires hardly fall off.SOLUTION: The ultrasonic transducer has: a piezoelectric ceramic sheet piece 2 which has a retracted portion 1, extending along a thickness, on a side face an upper electrode layer 3 placed on an upper surface of the ceramic sheet piece 2, and a terminal electrode layer 4 for the upper electrode layer that is connected to the upper electrode layer 3 a lower electrode layer 5 placed on the lower surface of the sheet piece 2 an electro-conductive layer 6 that is placed on the retracted portion 1 and connected to the lower electrode layer 5 a terminal electrode layer 7 for the lower electrode layer that is placed on the upper surface of the sheet piece 2 and connected to the electro-conductive layer 6 lead wires 9a and 9b connected to the terminal electrode layer 4 for the upper electrode layer and the terminal electrode layer 7 for the lower electrode layer an acoustic matching layer 10 placed on the upper surface of the upper electrode layer 3 and a sound absorbing layer 11 placed on the lower surface of the lower electrode layer 5. The lead wires 9a and 9b are temporarily fixed halfway with an adhesive 13 on a surface of an extension portion 12 of the sound absorbing layer 11 extended beyond side face having the retracted portion 1 of the piezoelectric ceramic sheet piece 2, and then further extend outward.COPYRIGHT: (C)2009,JPO&INPIT【課題】小型で、かつリード線が外れにくい構造の超音波探触子を提供する。【解決手段】厚み方向に伸びた凹部1を側面に有する圧電セラミックシート片2、シート片2の上面に備えられた上側電極層3と上側電極層3に接続する上側電極層用端子電極層4、シート片2の下面に備えられた下側電極層5、下側電極層5に接続する凹部1に備えられた導電層6、導電層6に接続するシート片2の上面に備えられた下側電極層用端子電極層7、上側電極層用端子電極層4と下側電極層用端子電極層7とに付設されたリード線9a、9b、上側電極層3の上面に備えられた音響整合層10、そして下側電極層5の下面に備えられた吸音層11からなり、リード線9a、9bはそれぞれ、圧電セラミックシート片2の凹部1を有する側面を超えて延長された吸音層11の延長部12の表面に、接着剤13によって途中で一旦固定され、次いで更に外に伸びている超音波探触子。【選択図】図1
