The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jan. 07, 2014
Filed:
Dec. 28, 2010
Kuan-wei Chen, Taichung County, TW;
Ming-daw Chen, Hsinchu, TW;
Chang-ho Liou, Changhua County, TW;
Kuo-hua Tseng, Taipei County, TW;
Kuan-Wei Chen, Taichung County, TW;
Ming-Daw Chen, Hsinchu, TW;
Chang-Ho Liou, Changhua County, TW;
Kuo-Hua Tseng, Taipei County, TW;
Industrial Technology Research Institute, Hsinchu, TW;
Abstract
A flat speaker unit is provided herein. The flat speaker unit includes a first porous electrode, a second porous electrode, and a vibrating membrane with an electret layer disposed there between. In one embodiment, a plurality of supporting members may be configured between the vibrating membrane and the first porous electrode, or between the vibrating membrane and the second porous electrode. In one embodiment, a flat speaker device is provided with at least two flat speaker unit stacked together. By electrically connecting two ends of a signal source respectively to the first and second porous electrodes, or, in another embodiment, electrically connecting one end of the signal source to both of the first and second porous electrodes and connecting another end of the signal source to the vibrating membrane, a sound with low THD is generated accordingly from the flat speaker unit.