| 摘要 |
PROBLEM TO BE SOLVED: To provide a small-sized magnetic encoder not requiring high accuracy in the attachment of a magnetic field detection element onto a magnetism generator. SOLUTION: The magnetic encoder is equipped with the magnetism generator 2, and magnetic detection elements 5a, 5b, 5c and 5d arranged in the gap 4 of the magnetism generator 2, and constituted so as to process the signals outputted from the magnetic detection elements by relative rotation to detect a rotational speed or a rotary position. The magnetism generator 2 is constituted of a permanent magnet formed into a cylindrical shape and magnetized so as to generate a parallel magnetic field B in one direction equal in a vertical direction with respect to the center axis in the central gap 4. A soft magnetic body 10 for forming a magnetic circuit is provided to the outer periphery of the magnetic body 2, and the magnetic field detection elements 5a, 5b, 5c and 5d are arranged in the gap 4 with mechanical phase difference of 90 deg. each other.
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