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:
Dec. 14, 2010
Filed:
Oct. 29, 2007
Masamichi Yamada, Hitachinaka, JP;
Nobuyasu Kanekawa, Hitachi, JP;
Kenji Nakabayashi, Hitachinaka, JP;
Masamichi Yamada, Hitachinaka, JP;
Nobuyasu Kanekawa, Hitachi, JP;
Kenji Nakabayashi, Hitachinaka, JP;
Hitachi, Ltd., Tokyo, JP;
Abstract
A highly accurate displacement sensor using GMR elements for detecting displacement of a physical quantity such as angle provides a diminished waveform distortion of output voltage. At least two Wheatstone bridge circuits having a predetermined angular offset are installed, with each bridge circuit including a plurality of GMR elements. Each of the GMR elements has a fixed magnetic layer set to a predetermined magnetization direction. An AC power supply is used, and displacement of a physical quantity, such as a rotational angle, is detected on the basis of AC-modulated outputs from the bridge circuits.