MAGNETIC SENSOR DEVICE

摘要

By providing a first magnet (6) and a second magnet (7) on the wall surfaces of a hollow section (2) where paper money (5) is conveyed such that different magnetic poles face each other, a gradient magnetic field is formed wherein both the magnetic field component in the opposing direction to the magnets and the magnetic field component in the conveyance direction of the paper money (5) include a zero point. An AMR element (10) is provided between the paper money (5) and the first magnet (6). The AMR element (10) is enclosed by a multi-layered substrate and covered with resin. The AMR element (10) is provided in an area where the magnetic field intensity is weak, which is where the magnetic field intensity in the gradient magnetic field in the conveyance direction is near zero. The paper money (5) passes through an area where the magnetic field intensity of the gradient magnetic field is strong.