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:
Apr. 12, 2011
Filed:
Aug. 21, 2009
Toru Takahashi, Iwata, JP;
Shintarou Ueno, Iwata, JP;
Toru Takahashi, Iwata, JP;
Shintarou Ueno, Iwata, JP;
NTN Corporation, Osaka, JP;
Abstract
A rotation detection device includes a plurality of magnetic encoders of a ring shape arranged coaxially and having different numbers of magnetic poles, a plurality of magnetic sensors each operable to detect the magnetic field of the corresponding magnetic encoder and having a function of detecting positional information within a single magnetic pole of the corresponding magnetic encoder, a phase difference detector to determine the phase difference of magnetic field signals detected respectively by the magnetic sensors, and an angle calculator to calculate an absolute rotation angle of the magnetic encoders based on the detected phase difference.