| 摘要 |
PROBLEM TO BE SOLVED: To provide a noise filter and a compound coil that can be used as a component of it, of which the variation in performance caused by a difference of manufacturing conditions is suppressed for stable frequency characteristics, and which is easy in manufacturing. SOLUTION: A third winding 13 is wound on a part of the outer peripheral surface of a first core 40 where first and second windings 11 and 12 are wound. Therefore, compared to the case that the third winding 13 is wound on a separate third core, the number of components is decreased and a variation in performance caused by a difference of manufacturing conditions of cores is suppressed, resulting in stable frequency characteristics. A first core 40 and a second core 50 are arranged side by side so that parts of outer peripheral surfaces of them face one another. By adjusting an interval D between the facing outer peripheral surfaces and facing areas, an inductance value L3 can be easily adjusted by the third winding 13. COPYRIGHT: (C)2007,JPO&INPIT
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