Magnetism sensor using a magnetism detecting device of a magnetic impedance effect type and control apparatus using the same

摘要

A magnetism detecting device of a magnetic impedance effect type includes a high-permeability magnetic film formed on a side of an approximately rectangular parallelepipedic, non-magnetic substrate. The high-permeability magnetic film is formed as a folded pattern having end portions extending in opposite directions and at least one folded portion disposed between the end portions, a longitudinal direction of the high- permeability magnetic film being parallel to a magnetic-field detecting direction. The high-permeability magnetic film is imparted magnetic anisotropy so that a direction of an axis of easy magnification of the high-permeability film is perpendicular to the longitudinal direction of the high-permeability magnetic film in a film plane thereof. Conductive films are formed at both ends of the high-permeability magnetic film as terminals. The high-permeability magnetic film and the conductive films are formed on the side of the non-magnetic substrate, which side is approximately perpendicular to a surface of a printed circuit board, so that the conductive films are directly soldered to a wiring pattern on the printed circuit board on which to mount the magnetism detecting device.