| 摘要 |
[PROBLEMS] In a sensor provided with a Hall element in a housing, the Hall element is arranged exactly in the nonflux region of a U-shaped magnet. [MEANS FOR SOLVING PROBLEMS] The sensor comprises a U-shaped magnet (50) having a pair of portions (51) opposing each other through an interval with a nonflux region A being formed between them, a Hall element (80) producing an output voltage variable depending on the density of passing flux, a spacer (40) for regulating positional relation of the Hall element (80) and the U-shaped magnet (50) such that the Hall element (80) is positioned in the nonflux region A of the U-shaped magnet (50), and a housing (10) covering the spacer (40).
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