Patent ID: 7612485

Claim:
An ultrasonic sensor for detecting an ultrasonic wave, which is output from an ultrasonic generator and reflected by an object to be detected, the ultrasonic sensor comprising: an acoustic matching layer having a first surface and a second surface, the first surface which receives the ultrasonic wave, and the second surface which is opposite to the first surface; an ultrasonic detection element including a vibration member; and a transmission member disposed between the vibration member and the acoustic matching layer member, wherein the vibration member is coupled with the second surface of the acoustic matching layer, the acoustic matching layer is repeatedly deformable in accordance with a standing wave, which is generated in the acoustic matching layer by the received ultrasonic wave, the vibration member resonates with the repeat deformation of the acoustic matching layer, and the transmission member transmits the repeat deformation of the acoustic matching layer to the vibration member.