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:
Aug. 16, 2011
Filed:
Jan. 25, 2006
Shinji Hori, Tokyo, JP;
Shinichiro Iizuka, Tokyo, JP;
Tomoaki Toratani, Tokyo, JP;
Shinya Saito, Tokyo, JP;
Kousuke Yamawaki, Tokyo, JP;
Shinji Hori, Tokyo, JP;
Shinichiro Iizuka, Tokyo, JP;
Tomoaki Toratani, Tokyo, JP;
Shinya Saito, Tokyo, JP;
Kousuke Yamawaki, Tokyo, JP;
The Furukawa Electric Co., Ltd., Tokyo, JP;
Abstract
A rotation sensor including: a main rotor that integrally rotates with a rotor to be measured; a sub-rotor that rotates in accordance with rotation of the main rotor with a different number of revolutions from that of the main rotor; a first detector detecting rotation of the main rotor; and a second detector detecting rotation of the sub-rotor. The rotation sensor detects an absolute rotation angle of the rotor to be measured from detection signals from the first detector and the second detector. Respective detection signals obtained from the first detector and the second detector are cyclically output in accordance with rotation of each rotor, and the following relationship is satisfied:()×(i and n are positive integers),wherein Tc is a cycle of the detection signal from the first detector, and Tm is a cycle of the detection signal from the second detector.