Patent ID: 7408444
Filing Date: 2008-08-05
Classification: H04R

Abstract:
1. Sound-reproducing transducer connected to a printed circuit, the transducer having the shape of a hollow cylinder whose cylindrical wall delimits two circular faces: a front face and a rear face that are opposed and planar, the transducer comprising: at least one diaphragm for converting electrical signals into sound waves and vice-versa, the diaphragm being a circular membrane parallel to the front face and the rear face of the transducer, the diaphragm delimiting two distinct volumes in the transducer: the first volume, bordered on one side by the circular face of the transducer and on the other side by the diaphragm, this first volume forming a front acoustic cavity, and the second volume, bordered on one side by the circular face of the transducer and on the other side by the diaphragm, this second volume forming a rear acoustic cavity, wherein said cylindrical wall of the transducer includes at least one perforation, wherein said perforation is of substantially rectangular shape.