| 摘要 |
PROBLEM TO BE SOLVED: To prevent the whole ferrite core from twisting and to hereby enable highly precise polishing. SOLUTION: A flat recess 6A is formed at the center of a rear face 6 of a ferrite core 1 to form an installation surface 7 with part of an end of the rear face 6 left, and regions extending from the recess 6A to the installation surface 7 are formed to be arcuate parts 6B and 6B. Thus, thermal deformation of the ferrite core 1 in baking or deformation in cooling can be eliminated, thereby highly precisely polishing surfaces of outer legs 2 and a center leg 3. COPYRIGHT: (C)2006,JPO&NCIPI
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