Patent ID: 7969068

Claim:
An ultrasonic transducer comprising a rectangular piezoelectric ceramic sheet piece which has a retracted portion on a side face, an upper electrode layer placed on an upper surface of the ceramic sheet piece, a first terminal electrode that is placed on the upper surface of the ceramic sheet piece and electrically connected to the upper electrode layer, a lower electrode layer placed on the lower surface of the ceramic sheet piece, an electro-conductive layer that is placed on the retracted side face and electrically connected to the lower electrode layer, a second terminal electrode that is placed on the upper surface of the ceramic sheet piece and is electrically connected to the electro-conductive layer, a first lead wire electrically connected to the first terminal electrode, a second lead wire electrically connected to the second terminal electrode, an acoustic matching layer placed on the upper electrode layer, and an acoustic absorbing layer placed on the surface of the lower electrode layer.