Patent ID: 7181038
Filing Date: 2007-02-20
Classification: H04R

Abstract:
1. A transducer for converting electrical energy into mechanical energy, the transducer comprising: a top portion of a housing having a circumference and a height adapted to flex in a controlled manner; a bottom portion of a housing having a circumference and a depth adapted to be rigid and stationary with respect to the top and supporting the top portion along the circumferences of the top and bottom portions when the top and bottom portions are placed to define an enclosure; and a conductive coil positioned between the top and bottom portions of the housing, to receive electrical signals and cause elastic deflections of the top in response to currents in the conductive coil caused by the electrical signals, the conductive coil comprising a bottom plate with a recess capable of being physically attached to the bottom portion, inside the housing; a magnet adapted to fit within the recess of the bottom plate; a top plate with a circular aperture through a symmetrical center, the top plate capable of being attached to the bottom plate; a pole cap adapted to fit within the circular aperture in the top plate; and a voice coil having a first end and a second end, the voice coil having a diameter smaller than the circular aperture of the top plate, the voice coil adapted to oscillate with the second end in a space between the pole cap and the circular aperture of the top plate.