| 摘要 |
An electromagnetic pickup assembly for a musical instrument, such as a guitar, strung with ferromagnetic strings, comprises two elongated high permeability ferromagnetic (steel or iron) cores each long enough to span some but not all of the strings; preferably, there are several thin steel laminations in the core. Two electrically conductive pickup coils are wound in coil forms, usually plastic; one such coil form encompasses each core. There are two vertically magnetized main permanent magnets, each having a high energy product (BxH); each main magnet engages the bottom edge of one core and maintains that core at a given polarity. A housing or other mounting members mount the cores, the coils, and the main permanent magnets in spaced relation to the strings so that the pickup generates two magnetic fields that, together, encompass all of the strings, whereby movement of any string or combination of strings generates electrical signals in the coils. Auxiliary permanent magnets of low energy product (BxH) material shield the sides of the cores and their coils; one such auxiliary permanent magnet may shield both cores.
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