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:
Nov. 19, 2002
Filed:
Feb. 21, 2001
Dongzhi Jin, Chiba, JP;
Fumihiko Abe, Chiba, JP;
Kengo Tanaka, Chiba, JP;
Kazuhiko Matsuzaki, Ichihara, JP;
Masahiro Hasegawa, Kameyama, JP;
Kosuke Yamawaki, Suzuka, JP;
The Furukawa Electric Co., Ltd., Tokyo, JP;
Abstract
A rotation sensor ( ) provided with a first rotor ( ) fixed to a predetermined position in the axial direction of the shaft, a second rotor ( ) fixed to the shaft ( ) adjoining the first rotor, and a magnetic material core (13) having a resonance coil ( ) arranged around the first rotor and forming a magnetic circuit working with the first rotor. The first rotor ( ) is formed by a magnetic material comprised of an insulator, an irregular magnetic field is formed with the magnetic material core, and the second rotor ( ) is provided with a conductor cutting across areas of different intensities of the irregular magnetic field in accordance with the difference of the angle of rotation when a difference in the angle of relative rotation occurs at a shaft position where the first rotor is fixed and a shaft position where the second rotor is fixed.