Patent ID: 7570048
Filing Date: 2009-08-04
Classification: G01R

Abstract:
1. A magnetic sensor for detecting an object comprising: a detection portion including at least one half bridge, wherein the at least one half bridge has two spin valve type electro-magnetic transformation devices disposed on a substrate; and a magnet disposed near the detection portion, wherein the magnet has a magnetic field changeable in accordance with influence of the object, wherein the spin valve type electro-magnetic transformation devices are arranged with respect to the magnet in such a manner that a direction of a magnetic field to be applied to one of the spin valve type electro-magnetic transformation devices is opposite to a direction of a magnetic field to be applied to the other one of the spin valve type electro-magnetic transformation devices, wherein the magnet has an opening, wherein the opening of the magnet is disposed on an edge surface of the magnet so that the opening of the magnet faces the object, wherein all of the one of the spin valve type electro-magnetic transformation devices is disposed on an inside of the opening from the edge surface, and wherein all of the other one of the spin valve type electro-magnetic transformation devices is disposed on an outside of the opening from the edge surface.