Patent ID: 6178252
Filing Date: 2001-01-23
Classification: H04R

Abstract:
An electroacoustic transducer (1) comprising a voice coil (17) and a diaphragm (19) for cooperating with an air mass in an acoustic free space situated in front of the diaphragm (19), said diaphragm capable of being set into vibration by the voice coil (17) substantially parallel to an axis of the electroacoustic transducer, said diaphragm having an annular outer zone (24), a central zone (21) which is convex with respect to the acoustic free space situated in front of the diaphragm, and a peripheral zone (23) which diverges towards the acoustic free space, said peripheral zone (23) being connected to the central zone (21) by an annular intermediate zone (22) and terminating in the outer zone (24) of the diaphragm (19), the annular intermediate zone (22) of the diaphragm (19) being constructed for securing the voice coil (17) of the transducer (1) to the diaphragm (19), characterized in that the annular intermediate zone (22) has angularly spaced-apart trough portions (29) which are substantially trough-shaped in cross-section and which are each bounded by a trough bottom wall (30) and two trough side walls (31, 32), of which each radially inner trough side wall (31) adjoins the central zone (21) and each radially outer trough side wall (32) adjoins the peripheral zone (23), and in each of these trough portions (29) the trough bottom wall (30) is connected to the trough side walls (31, 32) at those ends (33, 34) of the trough side walls (31, 32) which are remote from the acoustic free space in front of the diaphragm (19).