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:
Feb. 05, 1991
Filed:
Sep. 21, 1989
Toshitugu Ueda, Tokyo, JP;
Fusao Kohsaka, Tokyo, JP;
Toshi Iino, Tokyo, JP;
Kunio Kazami, Tokyo, JP;
Hiroshi Nakayama, Tokyo, JP;
Yoshiaki Kudou, Tokyo, JP;
Yasuhiro Sakamaki, Tokyo, JP;
Yokogawa Electric Corporation, Tokyo, JP;
Abstract
A multi-turn absolute encoder comprising a shaft angle encoder for measuring the turning angle of a rotating shaft, and a turn detector for detecting the number of turns of the rotating shaft, wherein the turn detector uses a magnetic bubble element for sequentially transferring magnetic bubbles in a pattern in accordance with a magnetic field generated by a permanent magnet turned by the shaft, and a detector to detect the number of turns of the shaft from the positions of the magnetic bubbles which are transferred in the pattern.