| 摘要 |
PROBLEM TO BE SOLVED: To obtain a rotation detector which detects accurate rotation without being affected even by scattering of sensitivity of magnetic sensors for magnetic rotors having a variety of rotor diameters and scattering of assembling of the device itself. SOLUTION: A pair of magnetic sensors 5 are provided in parallel. The sensor body 6 provided with a bias magnet 8 having a sensor center axis D which is perpendicular to the direction of the magnetic sensors 5 and passes the middle position of the pair of magnetic sensors 5 and having a direction of magnetism in its center axis direction, is arranged with an offset distance to the direction perpendicular to an extension line extended to the radial direction from the rotation center of the magnetic rotor 3 forming square teeth 4 on the periphery with a specific interval. A difference of a pair of sensor outputs is obtained, which is made a pulse signal to obtain information on rotation, and sensitivity adjustment is individually added to the pair of sensor outputs. COPYRIGHT: (C)2005,JPO&NCIPI
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