Patent ID: 8320218

Claim:
In combination in an electroacoustic transducer, a partial transducer, a thin sheet of material, and a method of acoustically connecting said partial transducer to said thin sheet of material so that the thin sheet of material become part of the resonator structure of said electroacoustic transducer, said partial transducer characterized in that it contains a partial resonator structure consisting of at least one piezoelectric component having a forward and rear parallel plane surface, an electrode attached to said parallel plane surface, electrical conducting means attached to each said electrode, a front partial acoustic transmission line, a rear acoustic transmission line, said acoustic transmission lines characterized in that they each contain two parallel surfaces, and one of the parallel surfaces of each acoustic transmission line is further characterized in that they are connected by attachment means, one to each of said parallel plane surfaces of said piezoelectric component, and said rear transmission line is further characterized in that the length between the two parallel surfaces plus half of the thickness of said piezoelectric component is approximately ¼ wavelength in the vicinity of the frequency of the length resonance, f L , of said resonating structure, attachment means for acoustically coupling the front surface of the front partial acoustic transmission line to said thin sheet of material so that the forward portion of said resonator structure consists of the combination of said thin sheet of material, said front partial acoustic transmission line, plus half of the thickness of said piezoelectric component, and the forward portion of said resonator structure is further characterized in that the length of the combined structure is approximately ¼ wavelength in the vicinity of the frequency of the length resonances, f L , of said resonating structure.