Patent ID: 8098855

Claim:
A flexible actuator, comprising: a thin film comprising a conductive layer and a first electret layer over a first surface of the conductive layer, the thin film is configured to be bendable; and at least one first enclosure having a plurality of protrusion portions with at least one first bendable element which is conformally coupled onto the first enclosure and being a connecting part of the first enclosure to connect to the thin film, the first enclosure having a first electrode layer and being provided over the first electret layer with the first electrode layer being spaced apart from the first electret layer and a plurality of separated cavities formed between the plurality of protrusion portions and the thin film, the first electrode layer being coupled with a first terminal of an audio signal input, wherein the thin film is configured to interact with the first enclosure in response to audio signals supplied by the audio signal input and to generate sound waves.