Patent ID: 6584209
Filing Date: 2003-06-24
Classification: H04R

Abstract:
An open-type magnetic circuitry of loudspeaker, comprising a lower yoke having a central portion upward projected by a predetermined length to form a bobbin, a magnet positioned on top of said bobbin, and a voice coil wound around said bobbin and said magnet; said magnetic circuitry being characterized in that said lower yoke is provided at an upper side surrounding said bobbin with a plurality of radially equally spaced supporting posts, a top end of which being higher than at least a bottom side of said magnet, that a ring-shaped upper yoke having a central hole is covered onto the top end of said supporting posts, so that said voice coil wound around said bobbin and said magnet upward extends along said central hole of said ring-shaped upper yoke to connect to a root portion of a diaphragm of said loudspeaker, and that an upper frame is provided around an outer side of said diaphragm to connect to said ring-shaped upper yoke to form a complete housing for an upper part of said loudspeaker.