Magnetic field detection device

摘要

A magnetic field detection device that detects two components of an external magnetic field. The device uses the magneto-impedance effect in ferromagnetic amorphous wire (10). A detection coil (11) wrapped around the amorphous wire detects the magnetic flux change of the amorphous wire, which is proportional to the external magnetic field. The sensitivity of the device is increased due to circuitry (15,16) that extracts the initial output pulse. It is also increased with the use of negative feedback (17,12) and with the comparison of differential outputs. The two sets of detection elements are placed orthogonally for greatest sensitivity. Resin molding is employed for easy handling. This detection device can be used as part of a compass. <IMAGE>