Patent ID: 6528992
Filing Date: 2003-03-04
Classification: G01R

Abstract:
A magnetic detector comprising:magnetic field generating means for generating a magnetic field; a moving member of magnetic material rotating about a rotational axis and disposed a predetermined distance apart from said magnetic field generating means for changing the magnetic field generated by said magnetic field generating means; and a magnetic field sensing device for detecting changes in the magnetic field by movement of said moving member of magnetic material, said magnetic field sensing device comprising a single magnetoresistive device disposed relative to said magnetic field generating means so that a first center axis of an upper surface of said magnetoresistive device and a center axis of an upper surface of said magnetic field generating means lie in a common plane, and a magnetic field acting on said magnetic field sensing device changes from positive to negative and from negative to positive with the movement of said moving member of magnetic material, wherein said magnetic field sensing device is not interposed between said magnetic field generating means and said moving member of magnetic material.