A telephone handset with a reduced thickness of the earpiece

摘要

Telephone handset comprising at least one earpiece part and comprising a housing (1), said housing containing at least one support plate (11) of electronic components (12) and a disc piezo electric - (3) connected to a support disk (4) is electrically conductive, said support disc (4) is held in place on its periphery between two holding parts and separating a first volume called the rear volume (16) is delimited, on the one hand by the assembly formed of the disk piezo electric - (3) and its support disk (4) and, on the other hand, by a rear wall by screws - to - screw of the said assembly (3, 4) and a circular lateral wall (19), the rear wall and the lateral wall constituting a rear part (14), said rear part (14) being arranged so as to allow the passage of the micro - leaks in order to constitute with the rear volume (16), a damping device, and a second volume, called the front volume (17), situated on the other side of said assembly and forming, with holes (21) formed in a wall (20) of the front volume facing the assembly (3 - 4), a helmoltz resonator, characterized in that said support plate (11) is applied directly against the rear wall (18) of the rear volume (16).