MAGNETIC FIELD DETECTION DEVICE

摘要

PROBLEM TO BE SOLVED: To provide a magnetic field detection device in which the number of components of a differential calculation section is reduced and the differential calculation section is downsized.SOLUTION: The magnetic field detection device includes; a first magnetic field generating section 110 having a first magnetic field generating conductor 111; a first magnetic field detecting section 410 having a first magnetic field detection element 10 and a first differential calculation section 210 which receives a first output of the first magnetic field detection element corresponding to an environmental magnetic field and feeds first feedback current through the first magnetic field generating conductor such that the first magnetic field generating section imparts a first feedback current magnetic field in a direction opposite the environmental magnetic field to the first magnetic field detection element; a second magnetic field generating section 120 having a second magnetic field generating conductor 121 through which second current corresponding to the first feedback current flows; and a second magnetic field detecting section 420 having a second magnetic field detection element 20. The second magnetic field generating section provides the second magnetic field detection element with a magnetic field corresponding to the second current in a direction opposite the environmental magnetic field, and the second magnetic field detecting section detects a detection magnetic field.