Patents Assigned to Sennheiser Electronic GmbH & Co. K.G.
  • Patent number: 6208743
    Abstract: An electrodynamic acoustic transducer with a coil which projects into an air gap subject to an electromagnetic field, wherein an acoustic short circuit is prevented. The electrodynamic transducer has a membrane comprising two differently profiled portions, an acoustically effective central portion with a convexity in form of a spherical cap, and a ring-shaped bead which borders the central portion and serves to elastically support the membrane. The ring-shaped bead is arranged beneath the central portion and extends radially inwards starting from a coil seat of the coil. The air gap is sealed by means of a liquid or solid medium, such as ferrofluid, such that an acoustic short circuit between the front volume and the rear volume of the transducer is prevented.
    Type: Grant
    Filed: March 18, 1997
    Date of Patent: March 27, 2001
    Assignee: Sennheiser Electronic GmbH & Co. K.G.
    Inventors: Stefan Marten, Rainer Wiggers