US Patent 8223996 Moving armature receiver

A compact moving armature receiver where the diaphragm element is positioned in the air gap of the magnet assembly and where a suspension element is provided for defining the front chamber, the suspension element has a stiffness of at the most 500 N/m. The suspension element and the diaphragm element may be made from the same sheet of a foil, and the suspension element may be formed by bent or curved peripheral parts of the foil.