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Advanced magnetic circuit to improve both the solenoidal and magnetic functions of string instrument pickups with co-linear coil assemblies

  • US 7,227,076 B2
  • Filed: 01/15/2005
  • Issued: 06/05/2007
  • Est. Priority Date: 01/15/2005
  • Status: Active Grant
First Claim
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1. A magnetic pickup for stringed musical instruments having ferromagnetic strings, comprising:

  • first and second bobbins each having upper and lower flange plates;

    a plurality of spacers disposed between the first and second bobbins to create a gap between the flange plates of the first and second bobbins;

    first and second coils wound around the first and second bobbins, respectively, the first and second coils each having an axis oriented perpendicular to a length of the ferromagnetic strings;

    a plurality of ferromagnetic poles each extending through both of the first and second coils;

    first and second ferromagnetic moderator bars each having an outward face oriented perpendicular to the upper and lower flange plates of the first and second bobbins and disposed in the gap between the first and second bobbins on opposite sides of the plurality of ferromagnetic poles, the first and second ferromagnetic moderator bars extending substantially a length of the first and second coils; and

    a plurality of high coercive permanent magnets affixed to the outward face of the first and second ferromagnetic moderator bars.

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