| 摘要 |
2110288 9222076 PCTABS00018 A yoked magnetic structure has a pair of spaced magnetized members defining a cavity, and an end ferromagnetic structure closing said cavity and abutting an end of the magnetized members. The end structure comprising at least a first element (91) of triangular cross section having one side abutting an end of one of said magnetized member and a second element (100) of triangular cross section having one side abutting the adjacent side of said cavity. The first and second elements have second sides away from the magnetized member and cavity defining at least part of an equipotential line whereby the flux density on the side of the equipotential line away from the magnetized structure is zero. A region of .mu.=$m(w) material is provided adjacent the magnetized member to minimize the effect of perturbations.
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