National Taiwan University

Jia-Lun Chen

Chih-Kung Lee

Wen-Jong Wu

Wen-Hsin Hsiao

Wen-Ching Ko

Shih-Yuan Lee

Ing Yih Leu

Chih-Chiang Cheng

Jen-Hsuan Ho

Ing-Yih Leu

Ji-De Huang

A method of making a nonfluoropolymer electret film is provided. The method may include: providing a polymer-containing solution, the polymer-containing solution comprising at least one polymer material, at least one solvent, and at least one surfactant, spreading the polymer-containing solution to provide a wetting polymer film, removing at least a portion of the solvent in the wetting polymer film to provide a polymer film, and conducting a Corona charging to the polymer film to form the electret film.

Method of manufacturing an electret film

A sound-generating device comprises at least two first enclosures and a thin film. The at least two first enclosures with at least one first bendable element coupled between two neighboring first enclosures. The thin film comprising at least one electrode and at least one piezoelectric layer, the at least one electrode being coupled with a terminal of an audio signal output, wherein the at least one piezoelectric layer is configured to respond to a signal supplied by the audio signal output and to generate sound waves. The thin film and the at least two first enclosures are coupled together forming at least two first cavities between the thin film and the first enclosure, and the first bendable element is attached to the thin film.

Flexible piezoelectric sound-generating devices

A sound-generating device comprises 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, and a first bendable element coupled between the first and second enclosures. The at least one first electrode is coupled with the first terminal of the audio signal output. 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.

A speaker comprises at least one electrode electrically coupled with an audio signal input and a film comprising at least one electret layer. The film is configured to interact with the electrode in response to an audio signal supplied by the audio signal input and to vibrate to generate sound waves. The electret layer is formed from a polymer-containing solution.

Electret materials, electret speakers, and methods of manufacturing the same

A flexible actuator comprises a thin film and at least one first enclosure with at least one first bendable element coupled to the first enclosure. The thin film may comprise a conductive layer and a first electret layer over a first surface of the conductive layer. The thin film is configured to be bendable. The first enclosure have a first electrode layer as part of the first enclosure. The first enclosure is provided over the first electret layer with the first electrode layer being spaced apart from the first electret layer. The first electrode layer is coupled with a first terminal of an audio signal input. 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.

Flexible electret actuators and methods of manufacturing the same

A speaker system that includes an audio signal-receiving interface, a modulating circuit, a phase-control circuit, and a number of speaker units. The audio signal-receiving interface is configured to receive an audio signal, and the modulating circuit is coupled with the audio signal-receiving interface. The modulating circuit is configured to modulate a low frequency component of the audio signal and to generate a modulated signal. The phase-control circuit is coupled with the modulating circuit and the audio signal-receiving interface. The phase-control circuit is configured to receive the modulated signal and a high-frequency component of the audio signal and to control a phase of the modulated signal, a phase of the high-frequency component of the audio signal, or both. The speaker units are coupled with the phase-control circuit and configured to generate sound waves based on signals supplied by the phase-control circuit.

Growing community of inventors

Tainan, Taiwan

Jia-Lun Chen