| 摘要 |
PROBLEM TO BE SOLVED: To grasp the location of a rotator in the circumferential direction with high accuracy and eliminate magnetic effects to another track. SOLUTION: In a polarized area formed in the outer circumferential part of the rotator 11, different magnetic poles are arranged alternately along the circumferential direction, and comprise a recording polarized part 11a formed in part over the whole circumference of the outer circumferential part. By magnetically detecting point in a track which contains the recording polarized part 11a, this rotation sensor determines whether the detected point is a point on the recording polarized part 11a or a point which is not on the polarized area. By narrowing the interval between the adjacent magnetic poles on the recording polarized part 11a, the polarized area becomes an aggregate of relatively fine magnetic poles to weaken magnetic forces.
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