Patent ID: 8379888

Claim:
A sound-generating device, comprising: a first enclosure having at least one first electrode and a first piezoelectric layer; a first terminal of an audio signal output being coupled to the at least one first electrode of the first enclosure; a second enclosure having at least one first electrode and a first piezoelectric layer, the at least one first electrode being coupled with the first terminal of the audio signal output; and a first bendable element coupled between the first and second enclosures, wherein the first enclosure, the second enclosure and the first bendable element are joined together by its ends, one end to another forming into a wave-shaped continuous structure, wherein the first piezoelectric layer of the first enclosure and the first piezoelectric layer of the second enclosure are configured to respond to the signal supplied by the audio signal output and to generate sound waves, wherein one or more wall structures of the first and second enclosures are substantially rigid to limit spacing variation in an enclosed space, wherein the first and second enclosures providing rigidity by thicker thickness on inner standing wall structures of the first and second enclosures than a thickness of the first bendable element.