Patent ID: 6529107
Filing Date: 2003-03-04
Classification: H01F,H04R

Abstract:
A speaker comprising a magnetic gap formed by a pole surface of a ring magnet and a ferromagnetic yoke, and a voice coil movable along a center axis of said ring magnet in said magnetic gap, wherein said ring magnet comprises at least one first radially anisotropic region having a radial anisotropy direction of 89Â° or more relative to said center axis thereof, and at least one second radially anisotropic region having a radial anisotropy direction of 40Â° or more and less than 89Â° relative to said center axis thereof, said first and second radially anisotropic regions being arranged along said center axis such that a space magnetic flux density distribution on an inner or outer surface of said ring magnet has increased linearity and/or peak value.