Magnetic pickup for stringed musical instrument

A magnetic pickup for a musical instrument having strings, comprising:

• (a) a coil common to a plurality of the strings;
• (b) a flat inner ferromagnetic polepiece of uniform thickness common to said strings and partially disposed in the coil;
• (c) magnet means common to said strings and magnetically coupled to said inner polepiece and inducing a single polarity in said inner polepiece;
• and
• (d) two flat separate outer ferromagnetic polepieces common to a plurality of the strings, each being magnetically coupled to said magnet means and disposed on opposite sides of said coil.

A magnetic pickup for a musical instrument having strings, comprising:

• (a) coil means common to a plurality of the strings;
• (b) a flat inner ferromagnetic polepiece of uniform thickness disposed in the coil and common to the plurality of the strings, said inner polepiece having a corresponding plurality of integral pole legs, there being one pole leg for each string and all said pole legs having the same height;
• (c) magnet means magnetically coupled to said inner pole-piece to induce a single polarity in each pole leg;
• and
• (d) two flat separate outer ferromagnetic polepieces common to the plurality of strings, each being magnetically coupled to said magnet means and disposed on opposite sides of said coil means, said outer polepiece each having one pole leg per string and all of said outer polepiece pole legs having the same height

A magnetic pickup for a stringed musical instrument, having a plurality of ferromagnetic strings supported generally in a single plane in side by side relation, comprising:

• (a) a coil;
• (b) a flat permanent magnet juxtaposed with said coil for inducing magnetic flux within said coil and within a plurality of said strings;
• and
• (c) a plurality of separate flat polepieces magnetically coupled with said permanent magnet and shaped to form a plurality of paths for magnetic flux through the turns of said coil, each of said paths including one of said strings, at least one of said polepieces being a thin flat sheet of ferromagnetic material juxtaposed with said permanent magnet and disposed in a plane generally normal to the plane of said strings, said sheet having an edge configuration spaced from each of said strings by a selected non uniform distance so that the length of the magnetic flux path through each of said string is individually determined in accordance with the shape of said edge.