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. 01, 2005
Filed:
Dec. 20, 2001
Dongzhi Jin, Tokyo, JP;
Fumihiko Abe, Tokyo, JP;
Masahiro Hasegawa, Tokyo, JP;
Tsuyoshi Nakamoto, Tokyo, JP;
Kengo Tanaka, Tokyo, JP;
Kazuhiko Matsuzaki, Tokyo, JP;
Kosuke Yamawaki, Tokyo, JP;
Dongzhi Jin, Tokyo, JP;
Fumihiko Abe, Tokyo, JP;
Masahiro Hasegawa, Tokyo, JP;
Tsuyoshi Nakamoto, Tokyo, JP;
Kengo Tanaka, Tokyo, JP;
Kazuhiko Matsuzaki, Tokyo, JP;
Kosuke Yamawaki, Tokyo, JP;
The Furukawa Electric Co., Ltd., Tokyo, JP;
Abstract
The rotation sensor () has a cylindrical first rotor () made of an insulating magnetic material, having conductor layers () arranged circumferentially, the first rotor being attached to a rotating first shaft () at a predetermined axial position; a fixed core () having an exciting coil (), the core being fixed to a fixing member with a space secured in the axial direction with respect to the first shaft; a second rotor () having nonmagnetic metal bodies () arranged circumferentially to oppose the conductor layers respectively, the second rotor being attached to a second shaft located adjacent to and rotating relative to the first shaft () and being located between the first rotor () and the fixed core (); and oscillating device connected to the exciting coil (), the oscillating device transmitting an oscillation signal of a specific frequency. The rotation sensor has rotation guides () for guiding rotation of the first and second rotors () respectively with respect to the fixed core ().