Patent ID: 7317663

Claim:
An ultrasonic sensor comprising: an ultrasonic transducer in a housing with a bottom and a cylindrical body, wherein the bottom of the housing has a piezoelectric element disposed on an inside surface, wherein the piezoelectric element has a connection pin electrically coupled with the element with one end extending out of the housing, and wherein the connection pin pierces a base that is disposed on the housing; a cylindrical elastic member that covers an outer peripheral surface and a connection pin pull-out surface of the transducer; a hollow case having an opening through which the transducer is inserted therein, wherein the case holds the transducer with the elastic member disposed thereon in the opening; a joining pin disposed in an exposing manner in a hollow space in the case, wherein an exposed portion of the joining pin is electrically coupled with the connection pin in the hollow space in the case, and wherein the joining pin warps in an insertion direction when the connection pin is pressed in the insertion direction of the transducer into the opening; and a circuit board disposed in the hollow space of the case in an electrically coupled condition with the piezoelectric element, wherein the electrically coupled condition of the circuit board with the piezoelectric element is achieved by an electrical coupling of the circuit board with the joining pin and the connection pin.