Multi-layer membrane

Abstract

The invention relates to an acoustic membrane (16) intended to be coupled to a movable coil (20) via a coil support (22). The membrane (16) comprises a coupling portion (32) for the coil support, which delimits a central portion and a peripheral portion of the membrane. The membrane (16) has a central zone (38) extending into the central portion, having a first stiffness; and a reinforcing ring (40) comprising the coupling portion (32), having a second stiffness greater than the first stiffness. The reinforcing ring (40) extends around the coupling portion (32) for 5% to 60% of the distance between the coupling portion (32) and the center of the membrane (C), and for 50% to 100% of the distance between the coupling portion (32) and a peripheral edge of the membrane. Figure for the abstract: Fig. 1