Patent ID: 6011855
Filing Date: 2000-01-04
Classification: G10K,H04R

Abstract:
A speaker device for emitting subsonic, sonic or ultrasonic compression waves, said device being comprised of:a generally hollow drum having a sidewall and first and second opposing ends;a rigid emitter plate attached to the first end of the drum, said plate having an outer face oriented away from the drum and an inner face disposed toward an interior cavity of the drum, said emitter plate having a plurality of apertures extending between the outer and inner faces;a thin piezoelectric film disposed across the apertures of the emitter plate;electrical contact means coupled to the piezoelectric film for providing an applied electrical input;pressure means coupled to the drum for developing a biasing pressure with respect to the thin film at the apertures to distend the film into an arcuate emitter configuration capable of constricting and extending in response to variations in the applied electrical input at the piezoelectric film to thereby create a compression wave in a surrounding environment.