| 摘要 |
<p>An electromagnetic pickup (10) for use in sensing the mechanical motion of strings includes a ferromagnetic housing (11) of elongate, longitudinally recessed form in which a ferromagnetic core is received. The core includes a plurality of coplanar, spaced, finger-like projections (36, 37) directed at the walls (13, 14) of the recess. Both the walls (13, 14) of the recess and the finger-like projections of the core are permanently magnetized to a common magnetic polarity and thus by magnetic repulsion will concentrate the flux into the gaps between the projections (36, 37). A coil (29) wound around the core then senses the flux changes of these concentrated flux fields due to string motion.</p> |
