Magnetic field shaping in an acoustic pick-up assembly

Details Magnetic field shaping in an acoustic pick-up assembly Magnetic field shaping in an acoustic pick-up assembly

1987-07-14

1989-03-07

Grimley, Arthur T.

Music

Instruments

84 116, G10H 308, G10H 318

Patent

active

048095788

ABSTRACT:
An electromagnetic pickup for use in sensing the mechanical motion of strings includes a ferromagnetic housing of elongate, longitudinally recessed form in which a ferromagnetic core is received. The core includes a plurality of coplanar, spaced, finger-like projections directed at the walls of the recess. Both the walls of the recess and the finger-like projections of the core are permanently magnetized to a common magnetic polarity and thus will concentrate by magnetic repulsion the flux into the gap between the projections. A coil wound around the core then senses the flux changes of these concentrated flux fields due to string motion.

REFERENCES:
patent: 2089171 (1937-08-01), Beauchamp
patent: 2896491 (1959-07-01), Lover
patent: 3066567 (1962-12-01), Kelley, Jr.
patent: 3183296 (1965-05-01), Miessner
patent: 3236930 (1966-02-01), Fender
patent: 3588311 (1971-06-01), Zoller
patent: 3983778 (1976-10-01), Bartolini

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