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US 2007/0182406 A1Published application
Encoder
AssigneeNok Corporation
InventorsKenichi Yarimizu, Shinji Nagasawa, Yoshiaki Ono, Naoto Kobayashi
Life of this patent
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AssigneeNok Corporation
InventorsKenichi Yarimizu, Shinji Nagasawa, Yoshiaki Ono, Naoto Kobayashi
Estimating the term…
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.
An encoder (1) in which N poles (5) and S poles (6) of magnets are arranged alternately in a circumferential direction at an equal pitch and an unequal pitch portion (8) is provided in a part on a circumference, wherein said unequal pitch portion (8) is formed by arranging said N poles (5) and said S poles (6) at an equal pitch all over the circumference and forming a shielding body (7) shielding a magnetism in a part on the circumference.
An encoder (1) in which N poles (5) and S poles (6) of magnets are arranged alternately in a circumferential direction at an equal pitch and an unequal pitch portion (8) is provided in a part on a circumference, wherein said unequal pitch portion (8) is formed by arranging said N poles (5) and said S poles (6) at an equal pitch all over the circumference and forming a cut portion (9) in a part on the circumference.
Dependencies are inferred from the claim text.