Electricity: measuring and testing – Magnetic – Magnetometers
Reexamination Certificate
2006-11-21
2006-11-21
Ledynh, Bot (Department: 2862)
Electricity: measuring and testing
Magnetic
Magnetometers
C324S249000, C033S35500D
Reexamination Certificate
active
07138798
ABSTRACT:
An azimuth meter using spin-valve giant magneto-resistive elements, which is simple in manufacturing process, can be made compact in size and contribute to power saving, is disclosed. The azimuth meter comprises a quadrilateral plane coil having two pairs of parallel opposed sides and four spin-valve giant magneto-resistive element pairs, each pair of the elements disposed on a plane parallel to the coil. The longitudinal directions of two elements of each pair orthogonally cross each other, and cross only a respective side or only the same side of a pair of the opposed sides of the plane coil at substantially 45 degrees. The pinned layer of one of the two elements is magnetized in its longitudinal direction, and that of the other element is magnetized in the same direction as the pinned layer of that one element. The paired elements are connected to each other at one end. While a voltage for measurement is being applied between the other ends, a midpoint potential is taken out of the ends of the elements connected to each other to determine an azimuth.
REFERENCES:
patent: 6556007 (2003-04-01), Abe et al.
patent: 2004/0104724 (2004-06-01), Sato
patent: 2004/0189295 (2004-09-01), Sato et al.
Abe Yasunori
Suzuki Kazuo
Hitachi Metals Ltd.
Ledynh Bot
LandOfFree
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