US 6,584,209 B1Granted

Open-type magnetic circuitry of loudspeaker

OwnerAlex Wanginventor

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Abstract

An open-type magnetic circuitry of loudspeaker includes a lower yoke having a central portion upward projected to form a bobbin, a magnet positioned on top of the bobbin, a voice coil wound around the bobbin and the magnet, and a diaphragm connected at a root portion to the voice coil. The magnetic circuitry of loudspeaker is characterized in that the lower yoke is provided at an upper side surrounding the bobbin with a plurality of radially equally spaced supporting posts, a top end of which being higher than at least a bottom side of the magnet, and that a ring-shaped upper yoke having a central hole is covered onto the top end of the supporting posts, such that heat produced by the voice coil during working could quickly dissipate via the spaces among the supporting posts. Since no heat would accumulate in the loudspeaker, the loudspeaker could always maintain good sound quality.

Claims3

Dependent claims

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.

Dependencies are inferred from the claim text.