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:
Apr. 15, 2014
Filed:
Aug. 16, 2012
Chih-kung Lee, Taipei, TW;
Yu-chi Chen, Nantou County, TW;
Han-lung Chen, New Taipei, TW;
Hsu-ching Liao, Taichung, TW;
Wen-hsin Hsiao, Taoyuan County, TW;
Chih-Kung Lee, Taipei, TW;
Yu-Chi Chen, Nantou County, TW;
Han-Lung Chen, New Taipei, TW;
Hsu-Ching Liao, Taichung, TW;
Wen-Hsin Hsiao, Taoyuan County, TW;
National Taiwan University, Taipei, TW;
Abstract
An electret loudspeaker device including a diaphragm, a first perforated electrode and a first spacer is provided. The diaphragm has an electret layer and an electrode layer. The first perforated electrode is stacked on a side of the diaphragm near the electret layer, and has multiple holes. The first spacer is stacked between the diaphragm and the first perforated electrode, and includes a first distribution area and plural second distribution areas. The first distribution area has first openings penetrating through the first spacer, and each first opening has a first opening space volume between the diaphragm and the first perforated electrode. Each second distribution area has second openings penetrating through the first spacer, and each second opening has a second opening space volume between the diaphragm and the first perforated electrode. A difference between the first and the second opening space volumes is greater than 10%.