| 摘要 |
PROBLEM TO BE SOLVED: To provide a rotation sensor capable of preventing detection from being affected by the backlash of gears or the like as much as possible, and excellent in detection precision. SOLUTION: The rotation sensor measures a rotation angle of a rotator 50 to be measured by using measuring rotors other than the rotator, and is provided with a first measuring rotator 10 which rotates with a number of revolutions approximately the same as that of the rotator to be measured, and a second measuring rotator 20 which rotates being interlocked with the first body by a number of revolutions smaller than that of the first body. The rotator to be measured and the first measuring rotator are united with gears, the first measuring rotator and the second rotator are united with gears, and the second measuring rotator intermittently rotates with the rotation of the first measuring rotator. In each measuring rotor, a permanent magnet having a radial magnetic field is arranged at the center, and moreover a predetermined number of magnetic field detecting elements are arranged respectively at spots where changes in the radial direction in a magnetic field generated by each magnet can be detected, independently of the rotation of the measuring rotators. COPYRIGHT: (C)2008,JPO&INPIT
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