Patent ID: 8760974

Claim:
An ultrasonic probe, comprising: a Capacitive Micro-Machined Ultrasonic Transducer, wherein the Capacitive Micro-Machined Ultrasonic Transducer comprises: a substrate comprising a first electrode and a lateral-wave sound velocity; and a diaphragm having a second electrode, wherein the diaphragm is connected at its peripheral edge to the substrate via a supporting wall which rises from the substrate, and a cavity is formed between the substrate and the diaphragm, wherein the lateral-wave sound velocity, at least in a fractional frequency band within a sensitive band of the ultrasonic probe, is not less than a longitudinal-wave sound velocity of a medium in contact with the substrate or the diaphragm, and wherein a coincidence frequency of the substrate with a medium in contact with the substrate or the diaphragm is present in the sensitive band.