Patent ID: 6931140
Filing Date: 2005-08-16
Classification: H04R

Abstract:
1. An electro-acoustic transducer comprising a magnetic circuit having a first and a second gap, each of the first and second gaps having an upper and a lower portion, the magnetic circuit further comprising magnetic means so to establish a magnetic field in the first and second gaps, a first and a second diaphragm situated on opposite sides of the magnetic circuit, a first coil of electrically conducting wire fastened to the first diaphragm, the first coil having first and second gap portions of its wire situated in respective ones of the upper portions of the first and second gaps, the first coil further having bridging portions of wire interconnecting the first and second gap portions of wire, the first coil being fastened to the first diaphragm at least at the bridging portions of the wire, and a second coil of electrically conducting wire fastened to the second diaphragm, the second coil having first and second gap portions of its wire situated in respective ones of the lower portions of the first and second gaps, the second coil further having bridging portions of wire interconnecting the first and second gap portions or wire, the second coil being fastened to the second diaphragm at least at the bridging portions of the wire.