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:
Nov. 26, 2013
Filed:
Nov. 14, 2006
Susanne Windischberger, Vienna, AT;
Josef Lutz, Rohrau, AT;
Susanne Windischberger, Vienna, AT;
Josef Lutz, Rohrau, AT;
Knowles Electronics Asia PTE. Ltd., Singapore, SG;
Abstract
A moving system () for a piezoelectric speaker () may include a membrane () and a piezoelectric layer () attached thereto, wherein a movement of the moving system () in a main direction (MD) is substantially caused by dilatation/contraction of the piezoelectric layer () transverse to the main direction (MD). To provide an advantageous frequency response of the moving system (), it is built up asymmetrically with respect to the moving characteristics. Accordingly, the modes are frequency shifted on the one hand and of less influence on the other. Hence, the frequency response of an inventive speaker () has less elevations and depressions in the frequency response. In a preferred embodiment the local compliance and/or the shape of the moving system () is asymmetric with respect to any point in the plane of the moving system ().