Université Du Maine

Other

Renault S.a.s.

Orkidia Audio

Université Paris-Sud 11

Tokyo Marui Co., Ltd.

Université Paris—sud

Acoustical Beauty

Guy Lemarquand

Gaël Guyader

Mathias Remy

Valérie Lemarquand

Bernard Richoux

Elie Lefeuvre

Johan Moulin

Benoît Merit

Marion Alexandra Laurence Woytasik

Fabien Jean François Parrain

Bernard Nemoff

Claire Peteul-Brouillet

Benoit Merit

Elie Marie Lefeuvre

The invention relates to a device for projecting a projectile B using a compressed air, in particular provided to be built into a replica weapon, associated with a source of electrical energy. The device comprises a sheath () which receives an electromagnetic means () for moving a movable piston () within the sheath () between a thrust nose () sealing a front (-) of the sheath provided with a projection tube, and a breech () sealing a rear (-) of the sheath. The invention also relates to a method for controlling the device.

Device for projecting a projectile by compressed air using electromagnetic piston compression, associated control method

The present invention relates to the field of electrodynamic speakers. Particularly, the present invention relates to an electrodynamic speaker structure having MEMS technology. More particularly, the invention relates to such a structure comprising stator-forming means, diaphragm-forming means, and resiliently shape-changing means for connecting such means.

Electrodynamic speaker structure having MEMS technology

The invention relates to an electro-acoustic to enclosure () comprising walls defining two cavities (), each provided with an aperture () shut off by a loudspeaker (), noteworthy in that it is said to be 'enclosed' and in that each cavity () has a shape for which the intersection with any plane containing the central axis (X-X'; X, X&#x2032;) of said loudspeaker () is a portion of an ellipse (E; E), the major axes (X-X&#x2032;; X-X&#x2032;) of said ellipses (E; E) being substantially coincident with said central axis (X-X&#x2032;; X, X&#x2032;) of said loudspeaker (), said aperture () being secant to said ellipses (E; E) in such a way that the second extreme points (P&#x2032;; P&#x2032;) of each ellipse (E; E) are situated in said aperture ().

High fidelty electro-acoustic enclosure and method of manufacture

The invention relates to a voice coil support () for a coil transducer motor structure () having a first surface () towards one end and a second surface () towards the other end along an axis of displacement Z, the voice coil support being adapted to receive at least one coil (H,L) wound therearound an outer surface () arranged in use for displacing the voice coil support () along its axis of displacement Z, as a current is driven through the coils (H,L) when the voice coil support () is placed in a magnetic field, characterized in that the voice coil support () comprises a material adapted to prevent airflow communication between at least the first surface () and the second surface ().

Voice coil support for a coil transducer motor structure

The invention relates to a moving part for an electro-dynamic transducer, including at least one mandrel supporting a winding of at least one coiled wire. The mandrel includes at least one first element rigidly connected inside at least one second element for guiding the moving part inside the transducer. The first element has a winding support for the coiled wire so that the coil is located inside the mandrel, as well as vibration transmitter, such as a diaphragm, the vibration being generated by the movement of the coil induced by the flow of current in the coil wire. The invention also relates to an electro-dynamic transducer including such a moving part.

Moving part and electrodynamic transducer provided with such a moving part

The disclosure relates to an electrodynamic-transducer magnetic motor device () having a moving coil comprising a magnetic circuit consisting of a tied angular magnet (), characterized in that said tied annular magnet has a hollow annular structure, said hollow annular structure comprising an annular cavity () connected to an upper portion () of an external surface () of said hollow annular structure by a first annular channel () forming a first gap in which a first winding () of the moving coil can move.

Electrodynamic-transducer magnetic motor

The present disclosure relates to a coil transducer motor structure () including at least one coil (), at least one magnetic element () arranged in use to provide a path for magnetic flux between the ends of said coil (), wherein the magnetic element () has a structure providing a curvilinear path therethrough for said magnetic flux.

Ironless and leakage free coil transducer motor assembly

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.

Electrodynamic transducer and use thereof in loudspeakers and geophones

A magnetic structure generating a magnetic field for an ironless motor of an electrodynamic loudspeaker having a mobile coil, wherein the magnetic structure generates a magnetic field in a gap in which the coil is arranged. The magnetic structure includes of a stack of three magnets corresponding to one intermediate magnet and two top and bottom covering magnets, the magnets forming a straight gap border and being located side by side, the intermediate magnet having a radial magnetic polarization, the covering magnets having identical magnetic polarizations and remanent magnetizations. The covering magnets have a radial or axial magnetic polarization. When magnetic polarization of the covering magnets is radial, remanent magnetization of each covering magnet is higher than remanent magnetization of the intermediate magnet, and when magnetic polarization of the covering magnets is axial, remanent magnetization of each covering magnet is lower than remanent magnetization of the intermediate magnet. Motors are provided.

Growing community of inventors

Le Mans, France

Guy Lemarquand