Patent ID: 8077903
Filing Date: 2011-12-13
Classification: H04R

Abstract:
1. A loudspeaker transducer for receiving an electrical signal and transmitting an acoustical signal through a transmission medium, wherein said acoustical signal is representative of said electrical signal, and wherein said transducer comprises: a) a cone type direct radiating diaphragm further comprising a voice coil former having a top inside diameter and a top outside diameter and a bottom inside diameter and a bottom outside diameter, all of said diameters being disposed uniformly about a central axis; b) a transducer cone type diaphragm of a semi-rigid polypropylene membrane of self supporting shape having an inside diameter and an outside diameter disposed uniformly about the central axis, wherein the inside diameter of the transducer cone diaphragm is firmly attached to the top outside diameter of the voice coil former, and c) a surround, comprising a flexible suspension member having an inside diameter and an outside diameter disposed uniformly about the central axis, with the inside diameter being attached to the outside diameter of the transducer cone type diaphragm, and d) a transducer basket frame uniformly disposed about the central axis and encircling the surround, further encircling the transducer cone type diaphragm, and further encircling the voice coil former, the transducer basket frame further attached to the outside diameter of the surround allowing for motion of the transducer cone type diaphragm and voice coil former relative to the stationary transducer basket frame, and a series of precisely defined and located areas of altered mechanical impedance relative to the mechanical impedance of adjacent areas of the semi-rigid self supporting membrane of the cone type diaphragm wherein the diaphragm material is polypropylene plastic and the localized areas of altered mechanical impedance are heated above ambient temperature but below polypropylene plastic's flow temperature.