Patent ID: 7696672
Filing Date: 2010-04-13
Classification: G01S,G10K,Y10T

Abstract:
1. An ultrasonic sensor for detecting ultrasonic waves reflected on an object to be detected, comprising: a piezoelectric element sandwiched between a first electrode and a second electrode; an acoustic matching member having a receiving surface for receiving the reflected ultrasonic waves and a connecting surface connected to the piezoelectric element via a conductive layer that is formed on and extends only along the connecting surface of the acoustic matching member; and a processing circuit for processing signals outputted from the piezoelectric element, the processing circuit being electrically connected to the first and the second electrodes of the piezoelectric element, wherein: a surface area of the conductive layer formed on the connecting surface of the acoustic matching member is larger than a surface area of the first electrode formed on the piezoelectric element, so that an overhang area not connected to the first electrode is formed on the conductive layer.