MAGNETIC SUBSTANCE DETECTION SENSOR AND MAGNETIC SUBSTANCE DETECTING APPARATUS
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United States of America Patent
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Issued Date -
Oct 2, 2008
app pub date -
Mar 27, 2008
filing date -
Mar 29, 2007
priority date (Note) -
Abandoned
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Abstract
The present invention aims at providing a magnetic substance detection sensor: which permits a high sensitivity magnetic field detection element to be effectively operative even in the vicinity of a magnet; which permits quantitative detection without depending upon the magnetic characteristic of a medium, e.g., soft magnetic material, etc.; which is compact and permits realization of reduced space; and which has high productivity. In addition, the present invention aims at providing a compact and high performance magnetic substance detecting apparatus. Specifically, in a magnetic substance detection sensor including a magnet producing a magnetic field, and a magnetic field detection element for detecting change of the magnetic field, the magnetic field detection element is disposed on a plane intersecting with the NS axis of the magnet at a point except for the middle point thereof with the NS direction of the magnet being as normal so that the magnetic field detection direction becomes in parallel to the plane, and a bias magnetic field is formed by the magnet.
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