Patent ID: 6208742
Filing Date: 2001-03-27
Classification: H04R

Abstract:
An electro-acoustic speaker comprising:(a) an input terminal;(b) a first coil connected to said input terminal so as to generate a first magnetic flux in response to an electrical signal at said input terminal;(c) a second coil connected to said input terminal so as to generate a second magnetic flux in response to said electrical signal;(d) a first diode connected in series with said first coil;(e) a second diode connected in series with said second coil and in such a way as to place the series combination of said second diode and said second coil in parallel with the series combination of said first diode and said first coil and to cause said first magnetic flux to be generated in response to positive values of said electrical signal and said second magnetic flux to be generated in response to negative values of said electrical signal, said first magnetic flux and said second magnetic flux being complementary;(f) a third coil connected to said input terminal so as to generate a third magnetic flux in response to said electrical signal, said third magnetic flux extending in a first direction in response to positive values of said electrical signal and in a second direction reverse to said first direction in response to negative values of said electrical signal, said third magnetic flux being in a region of influence of said first and second magnetic fluxes, so that said electrical signal causes magnetic reaction forces in said first, second and third coils; and(g) a speaker cone mounted so as to be driven by said magnetic reaction forces.