Electricity: measuring and testing – Magnetic – Displacement
Reexamination Certificate
2005-08-10
2008-09-23
Assouad, Patrick (Department: 2862)
Electricity: measuring and testing
Magnetic
Displacement
C324S207250
Reexamination Certificate
active
07427859
ABSTRACT:
A moving body detecting apparatus including at least a gear1as a magnetic moving body including at least one of a projected portion or a recessed portion, a bias magnet5for applying a bias magnetic field thereto, and two pairs of spin valve type giant magneto resistive elements R1, R2and R3, R4, 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 gear1, for example, linearly. In a first state in which a change in a magnetic field by the projected portion2of the gear1is not substantially received, the magnetic field at positions of the elements R1through R4includes a component forwardly in parallel or in anti-parallel with the magnetizing directions of the pinned layers of the elements R1through R4, and in a second state of receiving the change in the magnetic field by the projected portion2, a direction of a component of the magnetic field at the positions of the elements R1through R4in parallel with the magnetizing directions of the pinned layers is inversed.
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Fukuoka Seiji
Kido Toshinao
Assouad Patrick
Schindler David M.
TDK Corporation
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