Bose Corporation

Mark A Pircaro

Mark P Temple

Subarna Basnet

Circumferential mode vibrations, in a diaphragm of an acoustic transducer, are damped by defining at least one elongated opening extending radially along a portion of a length from the central area to the outer perimeter being covered by a material having higher damping properties than the material of the cone.

Acoustic transducer with vibration damping

An apparatus includes a voice coil bobbin for an electroacoustic driver. The bobbin has a plurality of cutouts for venting an interior of the bobbin. The bobbin includes a plurality of integral flanges at the end of the bobbin which can be used to secure a diaphragm to the end of the bobbin. Each of the flanges extends from the bobbin at an angle that is no more than about thirty nine degrees relative to a plane that is substantially perpendicular to an intended direction of travel of the bobbin during operation of the driver. An electrically conductive voice coil is wound around the bobbin.

Voice coil bobbin for an electroacoustic transducer

Breakup of an electro-acoustic transducer is disrupted by introducing discontinuities that do not conform to a configuration having n-fold radial symmetry. This may be accomplished by using irregular azimuthal spacing and/or by having a junction point of the discontinuities offset relative to the geometric center of the moving surface. The discontinuities may be implemented on one or more of the moving sound producing components, such as on a diaphragm and/or dust cap of the electro-acoustic transducer. A bridging member may be introduced to span the discontinuities to stiffen the sound producing components.

Sound producing system

A loudspeaker comprising a frame, a voice coil assembly disposed within the frame, a magnet assembly disposed within the frame and a first suspension element having an outer edge and an inner edge, wherein the outer edge is coupled to the voice coil assembly and the inner edge is coupled to the magnet assembly.

Loudspeaker suspension

A loudspeaker suspension structure has an inner circumferential border, and an outer circumferential border, and grooves each extending from the inner circumferential border to the outer circumferential border at an angle with respect to a normal to the inner circumferential border, a profile of a circumferential section of the suspension structure having continuous curvature. Each of the grooves varies from the inner border to the outer border, the variation corresponding to a variation of a principal contour of the suspension structure.

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Yuma, AZ, United States of America

Mark A Pircaro