Patent ID: 6298141
Filing Date: 2001-10-02
Classification: H04R

Abstract:
An electronic device comprising:a shell having an interior, an exterior and a resonant frequency;a transducer located in said interior of said shell, said transducer comprising:a first ferrite torroid affixed to said shell,first coils wound around said first ferrite torroid,a compliant material having a first end and a second end, said first end affixed to said shell and protruding through the center of said first ferrite torroid,a second ferrite torroid of a lesser size than said first ferrite torroid affixed to said second end of said compliant material thereby elevating said second ferrite torroid above said first ferrite torroid, andsecond coils wound around said second ferrite torroid;control circuitry operatively coupled to said transducer, said control circuitry capable of sending a low frequency audio signal to said transducer;said transducer causing said shell to vibrate around the resonant frequency of said shell, responsive to said control circuitry sending said low frequency signal; andwherein a low frequency sound is produced by the vibration of said shell.