Yokogawa Electric Corporation

Yasuhiro Sakamaki

Hiroshi Nakayama

Fusao Kohsaka

Toshitugu Ueda

Kunio Kazami

Toshi Iino

Yoshiaki Kudou

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.

Growing community of inventors

Tokyo, Japan

Yasuhiro Sakamaki