| 摘要 |
PROBLEM TO BE SOLVED: To provide a compact multi-rotation angle detection device capable of acquiring a high reduction ratio. SOLUTION: A first tooth part 1b is provided on the outer circumferential surface of a multi-rotatable first rotator 1, and an outer tooth part 7a of an outer ring gear 7 of a planetary gear mechanism 4 is engaged with the first tooth part 1b. The planetary gear mechanism 7 includes a sun gear 8, a planetary gear 9, and a second rotator 2 arranged coaxially with the sun gear 8, and a first magnet 10 is mounted on the second rotator 2, and a first magnetic detection element 12 facing to the first magnet 10 is mounted on a circuit board 5. The planetary gear 9 has a first gear part 9a and a second gear part 9b having each mutually different number of teeth, and the second gear part 9b having the smaller number of teeth is engaged with a second tooth part 2a of the second rotator 2, and thereby the second rotator 2 is rotated at a prescribed reduction ratio following rotation of the first rotator 1. COPYRIGHT: (C)2011,JPO&INPIT
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