Patent ID: 7418108

Claim:
A transducer comprising: an upper spring assembly having an upper spring; a magnet assembly having a magnet positioned on a stud; a main plate assembly having a main plate with an aperture; a coil assembly having a first coil, a second coil, and an electrical power source attached to each coil; and a lower spring assembly having a lower spring, wherein: the upper spring and the lower spring are comprised of surfaces and are secured at a peripheral region thereof to the main plate assembly; the coil assembly is secured to the main plate so as to position the first coil and second coil adjacent opposite sides of the aperture and the electrical power source is attached to the first coil and the second coil so that the first and second coils are positioned in said a south-to-south configuration; and the stud of the magnet assembly is secured to the upper spring assembly and the lower spring assembly and suspends the magnet within the aperture and coil assembly.