Patent ID: 9491550
Filing Date: 2016-11-08
CPC Classification: H03H,H04R

Claim Text:
1. A piezoelectric stack transducer comprising: a transducer portion comprising a plurality of piezoelectric transducers, wherein the plurality of piezoelectric transducers are continuously stacked and each of the plurality of piezoelectric transducers has a circular cross-section shape; and a stacked electrode portion coupled to each of the plurality of piezoelectric transducers, wherein the stacked electrode portion supplies an electric signal having a first frequency to all of the plurality of piezoelectric transducers, wherein a natural frequency of each of the plurality of piezoelectric transducers is determined by a diameter of the each of the plurality of piezoelectric transducers, and wherein at least two of the plurality of piezoelectric transducers have different diameters from one another, and the transducer portion outputs a constant amplitude.