| 摘要 |
A rotation detecting device is provided that detects the rotation of a rotating object by means of a biasing permanent magnet and multiple sensor chips. The sensor chips are disposed on front and back sides of a mounting chip along the rotation direction of the rotating object, aligned with a line perpendicular to the direction or rotation of the rotating object, so as to convert magnetic vectors of a magnetic field to a plurality of sensor signals. A selection circuit is connected to the magnetoresistance sensors and selects the one of the sensor signals whose magnitude is the largest.
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