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Université Du Maine

Acoustical Beauty

Bernard Richoux

Guy Lemarquand

Valérie Lemarquand

The invention relates to an electrodynamic transducer () with a dome type diaphragm (), comprising an electrodynamic motor with a coil () borne by a mandrel () integral with the diaphragm suspended to a yoke (), the coil being placed in an air gap of a vertical free space in which it can move and which is defined, toward the center, by an internal magnetic construction (), and toward the periphery, by an external magnetic construction (), wherein the suspension comprises neither peripheral suspension nor internal suspension, the transducer comprises at least two magnetic field confinement means () in the air gap in order to form by mean of a ferromagnetic liquid at least two ferrofluidic seals () stepped in the air gap, fulfilling at least the guidance of the coil and the pneumatic tightness between the front and rear faces of the diaphragm, at least one of the ferrofluidic seals being continuous. Application to loudspeakers.

Electrodynamic transducer including a dome with a ferrofluid suspension

An electrodynamic transducer includes a frame and contains at least one electric coil which is placed in a static magnetic field and which can move about a rest position in a vertical free space. The coil(s) is wound around and fixed to a mandrel and a return member is used to return the coil-bearing mandrel to the rest position in the absence of an external bias, the straight cylinder defining an inner volume and an outer volume. The magnetic field is produced by outer and inner magnetic structures which each comprise at least one fixed permanent magnet in the form of a ring. The motor does not contain any ferromagnetic or magnetic part between the outer volume and the inner volume. At least the part of the frame that is used to fix the magnets is made from a non-ferromagnetic and non-magnetic material.

Growing community of inventors

Montoire, France

Bernard Richoux