MAGNETIC DETECTION DEVICE

摘要

A magnetic field component in a Z direction is guided by a magnetic field guide layer and applied to a magnetic sensor in an X direction that is the same as a sensitivity axis direction thereof, and a detection output is obtained. A bridge circuit is formed with a plurality of magnetic sensors and configured such that an output is not provided for a magnetic field component in the X direction. However, when an external magnetic field in the X direction is drawn to the magnetic field guide layer, variation of sensitivity for the X direction may occur. Thus, soft magnetic characteristics of a first portion of the magnetic field guide layer are deteriorated to decrease the magnetic permeability of the first portion.

主权项

1. A magnetic detection device comprising:
a magnetic field guide layer configured to guide a magnetic field component in a first direction; and a magnetic sensor disposed on a virtual surface facing an end portion of the magnetic field guide layer, the magnetic sensor having a sensitivity axis in a second direction perpendicular to the first direction, wherein the magnetic field guide layer includes a first portion facing the magnetic sensor and a second portion away from the magnetic sensor, and a magnetic permeability of the first portion is lower than that of the second portion.