Patent ID: 6351542
Filing Date: 2002-02-26
Classification: B42D,B60R,G06F,G07F,H04R

Abstract:
A loudspeaker comprising an enclosure having an opening, an acoustic radiator, a compliant suspension mounting the radiator in the opening for pistonic movement relative to the enclosure, and an air pump in fluid communication with the enclosure and responsive to an electrical audio signal for cyclically varying the air pressure in the enclosure to cause the radiator to move pistonically in accordance with the audio signal to produce an audio output, the radiator being a resonant member and having a vibration transducer mounted thereon to apply bending wave energy thereto responsive to an electrical audio signal to vibrate the radiator to cause it to resonate to provide an acoustic output when resonating, wherein the air pump comprises a subsidiary enclosure, a pistonic driver mounted in the subsidiary enclosure and a conduit coupling the interiors of said enclosures such that air pressure waves produced by motion of the pistonic driver are transmitted to the first said enclosure.