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US 8,077,903 B2Granted
Method and apparatus for controlling material vibration modes in polymer and paper high performance speaker diaphragms
OwnerMark Douglas McKenzieinventor
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OwnerMark Douglas McKenzieinventor
Estimating the term…
A method for reducing the radiation amplitude of material vibration modes (division vibrations) from a loudspeaker transducer diaphragm mechanically vibrated for the purpose of transforming an electrical signal into an acoustic signal. The diaphragm material may consist of formed paper or plastic sheet materials or molded paper pulp. The amplitude reduction of material vibration modes and pressure waves within the diaphragm material is accomplished by impressing small, shaped structures within the diaphragm material at critical locations determined by measurement with laser vibration analysis or position sensitive transient analysis of a loudspeaker transducer. The method is applied to the diaphragm material after it has been formed into the shape of a loudspeaker transducer diaphragm, either before or after the diaphragm has been assembled into a loudspeaker transducer.
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 method of altering the mechanical impedance of the material comprising a diaphragm for use with an electro-acoustic transducer where the diaphragm is formed of one or more uniform materials where the mechanical impedance of one or more of the uniform materials is made non uniform using a shaped die or dies smaller in dimensions than the total surface area of the formed diaphragm, applied after the diaphragm has been formed into the shape of a diaphragm for use in a electro-acoustic transducer wherein the alteration of the localized area of diaphragm material mechanical impedance result in a diaphragm (or diaphragm section when the diaphragm is made of more than one uniform material) wherein the diaphragm (or section of diaphragm) has an irregular or non uniform mechanical impedance, and where the areas of irregular or non uniform mechanical impedance are comprised of three dimensional structures formed after the diaphragm material has been formed into the shape of the electro-acoustic transducer diaphragm.
Dependencies are inferred from the claim text.