| 摘要 |
<p>A plurality of magnetosensitive portions (20b), (20c), (20d) of a plurality of magnetic resistance elements (2b), (2c), (2d); and a plurality of magnets (5b), (5c), (5d) are aligned substantially linearly to be orthogonal to a moving direction of a detection object, and directions of magnetic poles of the magnets (5b), (5c), (5d) are alternately inversed so that directions of magnetic fluxes, which are perpendicular to a surface on which the magnetosensitive portions of the magnetic resistance elements (2b), (2c), (2d) are formed, of the continuously disposed magnets, are alternately inversed. If a magnetic substance (101cd) of the detection object is present, the intensity of the magnetic flux, which comes out from the magnet (5c), then passes through the magnetosensitive portions (20c), (20d), and then comes into the magnet (5d), is changed. Accordingly, such a magnetic substance (101cd) can be detected due to the change in resistances of the magnetic resistance elements (2c), (2d).</p> |
