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:
Sep. 23, 2008
Filed:
Aug. 10, 2005
Seiji Fukuoka, Tokyo, JP;
Toshinao Kido, Tokyo, JP;
Seiji Fukuoka, Tokyo, JP;
Toshinao Kido, Tokyo, JP;
TDK Corporation, Tokyo, JP;
Abstract
A moving body detecting apparatus including at least a gearas a magnetic moving body including at least one of a projected portion or a recessed portion, a bias magnetfor applying a bias magnetic field thereto, and two pairs of spin valve type giant magneto resistive elements R, Rand R, R, in which the moving body detecting apparatus is arranged such that magnetizing directions of pinned layers of the paired spin valve type giant magneto resistive elements are directed to direct substantially in a forward direction and substantially in an opposite direction relative to the direction of moving the gear, for example, linearly. In a first state in which a change in a magnetic field by the projected portionof the gearis not substantially received, the magnetic field at positions of the elements Rthrough Rincludes a component forwardly in parallel or in anti-parallel with the magnetizing directions of the pinned layers of the elements Rthrough R, and in a second state of receiving the change in the magnetic field by the projected portion, a direction of a component of the magnetic field at the positions of the elements Rthrough Rin parallel with the magnetizing directions of the pinned layers is inversed.