| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a magnetic rotation sensor capable of acquiring great output with high sensitivity, even when being not arranged close to a gear which is a detection object. Ž<P>SOLUTION: This magnetic rotation sensor is equipped with: a bias magnet arranged on the outer circumference of a rotator having concavity and convexity on the outer circumference, for generating a magnetic flux in the same direction as a direction of a rotating shaft of the rotator; a board-like magnetic flux guide arranged close to the bias magnet so as to allow passage of the magnetic flux generated from the bias magnet; and a magnetic resistance element arranged closer to a position on the rotator side than the magnetic flux guide, for detecting a magnetic flux direction near the magnetic flux guide. The shape of the magnetic flux guide is constituted to be a shape enclosing a part except on the rotator side of the magnetic resistance element as a view from the same direction as the direction of the rotating shaft of the rotator so that the magnetic flux direction near the magnetic flux guide on a plane including a radial direction of the rotator is changed by being rotated at 360 degrees according to the position of concavity and convexity on the outer circumference of the rotator. Ž<P>COPYRIGHT: (C)2010,JPO&INPIT Ž
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