An improved electro-acoustic transducer element.

摘要

An electro-acoustic transducer element includes a polymer, preferably polyvinylidene fluoride, piezoelectric film of an acoustic impedance Z0 and at least one, preferably polymeric, additional layer of like acoustic impedance Z coupled to one side surface of the film, either directly or indirectly. Adequate adjustment in thickness of the additional layer enables free change in frequency characteristics of its acoustic effect without any change in dimensions of the polymer piezoelectric film.