Advanced magnetic circuit to improve both the solenoidal and magnetic functions of string instrument pickups with co-linear coil assemblies
First Claim
Patent Images
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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Abstract
An electromagnetic pickup for a stringed musical instrument incorporating a magnetic structure placed between two elongated collinear coils of opposing polarity. The magnetic structure includes a number of ferromagnetic polepieces that extend through the collinear coils and two ferromagnetic moderator bars adjacent to and on opposite sides of the polepieces (within the area between the two coils) that are charged with one polarity by high coercive permanent magnets attached to the outer surface of the moderator bars.
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Citations
26 Claims
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1. A magnetic pickup for stringed musical instruments having ferromagnetic strings, comprising:
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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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A magnetic pickup for stringed musical instruments, comprising:
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first and second bobbins having upper and lower flange plates physically separated by spacers; first and second coils wound around the first and second bobbins, respectively; a plurality of ferromagnetic poles each extending through the first and second coils; first and second ferromagnetic moderator bars each having an outward face oriented perpendicular to the flange plates of the first and second bobbins, the first and second ferromagnetic moderator bars being disposed between the first and second bobbins on opposite sides of the plurality of ferromagnetic poles; and first and second permanent magnets affixed to the outward face of the first and second ferromagnetic moderator bars, respectively. - View Dependent Claims (10, 11, 12, 13, 14)
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15. A magnetic pickup for stringed musical instruments, comprising:
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first and second bobbins physically separated by spacers; first and second coils wound around the first and second bobbins, respectively; a plurality of ferromagnetic poles each extending through the first and second coils; first and second ferromagnetic moderator bars disposed between the first and second bobbins on opposite sides of the plurality of ferromagnetic poles; and first and second permanent magnet affixed to an outward face of the first and second ferromagnetic moderator bars, respectively. - View Dependent Claims (16, 17, 18, 19)
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20. A method of making a magnetic pickup for stringed musical instruments, comprising:
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providing first and second bobbins physically separated by spacers; winding first and second coils around the first and second bobbins, respectively; disposing a plurality of ferromagnetic poles through the first and second coils; disposing first and second ferromagnetic moderator bars between the first and second bobbins on opposite sides of the plurality of ferromagnetic poles; and affixing first and second permanent magnets to an outward face of the first and second ferromagnetic moderator bars, respectively. - View Dependent Claims (21, 22, 23, 24, 25)
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26. A magnetic pickup for stringed musical instruments having ferromagnetic strings, the pickup comprising:
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a primary upper coil, placed below the strings, to transduce magnetic energy of the vibrating strings into an electrical signal; a secondary coil for neutralizing external oscillating fields, cancelling Eddy currents caused by the ferromagnetic poles, and determining harmonic spectrum of the signal generated by the primary coil; a plurality of ferromagnetic poles extending through the primary and the secondary coils, the coils being axially spaced to extend perpendicular to a length of the strings; first and second ferromagnetic bars disposed adjacent to each side of the ferromagnetic poles separating the primary and the secondary coils; and high coercive rare earth permanent magnets affixed to the sides of the first and second ferromagnetic bars opposite the plurality of ferromagnetic poles.
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Specification