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US 9,071,898 B2Granted
Acoustic loudspeaker
AssigneeFocal Jmlab
InventorArnaud Cazes Bouchet
Life of this patent
Estimating the term…
Abstract
Acoustic loudspeaker comprising: a movable membrane; a source of constant magnetic field, a coil mechanically secured to said membrane and interacting with the magnetic field so as to displace the membrane, when it is traversed by an alternating current, characterized in that the membrane carries the coil at its periphery, and in that the magnetic field source is formed by a set of at least one magnetized element disposed at the periphery of said membrane, around the coil, the magnetic field generated by said at least one magnetized element being in a plane parallel to the membrane.
Claims8
An acoustic loudspeaker comprising:
- a mobile membrane;
- a constant magnetic substantially homogeneous field source substantially parallel to the membrane;
- a winding secured to the periphery of said membrane, and interacting with the magnetic field to displace the membrane when it conducts an alternating current;
- and
- wherein the magnetic field source is formed of a set of magnetized elements distributed at the periphery of said membrane, around the winding, each magnetized element having a cylindrical surface opposite to the winding, the magnetic field generated by said magnetized elements having field lines emerging from said cylindrical surface along its entire height.
2 more elements
Dependencies are inferred from the claim text.