| 摘要 |
To easily manufacture an encoder ( 1 ), in which N-poles ( 5 ) and S-poles ( 6 ) of magnets are arranged alternately in a circumferential direction and in which an unequal pitch portion ( 8 ) is provided in a part on a circumference, without using a magnetizing head of a special shape having an unequal pitch portion, the unequal pitch portion ( 8 ) is formed by arranging the N-poles ( 5 ) and the S-poles ( 6 ) at an equal pitch all over the circumference and then providing a part on the circumference with a shielding member ( 7 ) for shielding a magnetism, or the unequal pitch portion ( 8 ) is formed by arranging the N-poles ( 5 ) and the S-poles ( 6 ) at an equal pitch all over the circumference and then providing a part on the circumference with a cut portion.
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