Electricity: measuring and testing – Magnetic – Displacement
Patent
1996-10-31
1998-09-01
Snow, Walter E.
Electricity: measuring and testing
Magnetic
Displacement
32420721, 338 32R, G01B 714, G01R 3306, F62B 5306
Patent
active
058015299
ABSTRACT:
The invention provides a sensing device capable of outputting a correct signal precisely corresponding to a particular position (angle) of, for example a protruding or recessed portion of a rotating member made of a magnetic material. The sensing device includes: a magnet for generating magnetic field; a rotary member of magnetic material for changing a magnetic field generated by the magnet, the rotary member of magnetic material being disposed a predetermined distance apart from the magnet; and a giant magnetoresistance device for detecting the varying magnetic field, the operating range of the giant magnetoresistance device being set such that the change in resistance of the giant magnetoresistance device is uniform over the entire operating range in both directions of change in the magnetic field induced by the rotary member of magnetic material, wherein the giant magnetoresistance device is disposed in such a manner that the center of the magnetic field sensing plane of the giant magnetoresistance device deviates from the center of the magnet in a direction parallel to a plane containing the displacement direction of the rotary member of magnetic material.
REFERENCES:
patent: 5021736 (1991-06-01), Gonsalves et al.
Journal of Magnetics Society of Japan, vol. 15, No. 51991, pp. 813 to 820 (No Translation).
Fukui Wataru
Hiraoka Naoki
Ohashi Yutaka
Umemoto Hideki
Yokotani Masahiro
Mitsubishi Denki & Kabushiki Kaisha
Snow Walter E.
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