| 摘要 |
The invention relates to a sound-reproducing transducer (60) connected to a printed circuit (50). This transducer (60) has the shape of a hollow cylinde r whose cylindrical wall (66) delimits two circular faces, one front face (66c ) and one rear face (66d) that are opposed and planar. The transducer (60) comprises at least one diaphragm (64) that makes it possible to convert electric signals into sound waves and conversely. This diaphragm (64) is a circular membrane parallel to the front face (66c) and rear face (66d) of th e transducer (60). The diaphragm (64) delimits two distinct volumes in the transducer (60), the first volume being bordered on one side by the circular face (66c) of the transducer (60) and on the other by the diaphragm (64) whi le forming a front acoustic cavity (61), and the second volume being bordered o n one side by the circular face (66d) of the transducer (60) and on the other by the diaphragm (64) while forming a rear acoustic cavity (62). The invention is characterized in that the cylindrical wall (66) of the transducer (60) has a t least one perforation (72, 74, 76, 77, 78).
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