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:
Aug. 05, 2008
Filed:
Jul. 19, 2004
Stéphane Dufosse, Cormeilles En Parisis, FR;
Jean-christophe Villain, Ounans, FR;
Eric Menu, Paris, FR;
Yves Le Baudour, Franconville, FR;
Stéphane Dufosse, Cormeilles En Parisis, FR;
Jean-Christophe Villain, Ounans, FR;
Eric Menu, Paris, FR;
Yves Le Baudour, Franconville, FR;
T & A Mobile Phones Limited, Hong Kong, CN;
Abstract
The invention relates to a sound-reproducing transducer () connected to a printed circuit (). This transducer () has the shape of a hollow cylinder whose cylindrical wall () delimits two circular faces, one front face () and one rear face () that are opposed and planar. The transducer () comprises at least one diaphragm () that makes it possible to convert electric signals into sound waves and conversely. This diaphragm () is a circular membrane parallel to the front face () and rear face () of the transducer (). The diaphragm () delimits two distinct volumes in the transducer (), the first volume being bordered on one side by the circular face () of the transducer () and on the other by the diaphragm () while forming a front acoustic cavity (), and the second volume being bordered on one side by the circular face () of the transducer () and on the other by the diaphragm () while forming a rear acoustic cavity (). The invention is characterized in that the cylindrical wall () of the transducer () has at least one perforation ().