The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Mar. 24, 2009
Filed:
Apr. 14, 2005
Kenichi Yarimizu, Fukushima, JP;
Shinji Nagasawa, Fukushima, JP;
Yoshiaki Ono, Fukushima, JP;
Naoto Kobayashi, Fukushima, JP;
Kenichi Yarimizu, Fukushima, JP;
Shinji Nagasawa, Fukushima, JP;
Yoshiaki Ono, Fukushima, JP;
Naoto Kobayashi, Fukushima, JP;
NOK Corporation, Tokyo, JP;
Abstract
To easily manufacture an encoder, in which N-poles and S-poles of magnets are arranged alternately in a circumferential direction and in which an unequal pitch portion 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 is formed by arranging the N-poles and the S-poles at an equal pitch all over the circumference and then providing a part on the circumference with a shielding member for shielding a magnetism. Alternatively, the unequal pitch portion is formed by arranging the N-poles and the S-poles at an equal pitch all over the circumference and then providing a part on the circumference with a cut portion.