Patent ID: 8720022

Claim:
A method of producing an acoustic wave device, comprising: forming an interdigital transducer having a pair of comb-shaped electrodes on a piezoelectric substrate; forming a barrier film so as to cover the interdigital transducer; forming a medium on the barrier film; measuring a frequency characteristic of an acoustic wave excited by the interdigital transducer; forming, within an excitation region directly over the pair of comb-shaped electrodes where the acoustic wave is excited by the pair of comb-shaped electrodes, an adjustment region having a surface area T as viewed from a top view and a thickness different from other portions of the excitation region in the same layer of the barrier film by patterning the barrier film or further providing an adjustment film; and adjusting a frequency characteristics of the acoustic wave by adjusting the surface area T of the adjustment region when forming the adjustment region.