公开(公告)号：US20230118914A1

公开(公告)日：2023-04-20

申请号：US17966066

申请日：2022-10-14

Applicant: TDK Corporation

Inventor： Takato FUKUI ,  Takeo GOKITA

IPC: G01D5/14

Abstract: Disclosed herein is a magnetic sensor that includes first and second magnetic structures each having an annular structure and arranged in a first direction with a magnetic gap interposed therebetween, a magnetosensitive element disposed on a magnetic path formed by the magnetic gap and has a sensitivity axis in the first direction, a first excitation coil wound around the first magnetic structure, and a second excitation coil wound around the second magnetic structure.

公开(公告)号：US20210116518A1

公开(公告)日：2021-04-22

申请号：US16981146

申请日：2019-03-11

Applicant: TDK CORPORATION

Inventor： Takeo GOKITA

IPC: G01R33/09

Abstract: An object of the present invention is to provide a magnetic sensor capable of detecting a magnetic field to be measured through closed loop control even when the magnetic field is weak. A magnetic sensor includes magnetic layers 41 and 42 opposed to each other through a magnetic gap G1, a magneto-sensitive element R1 disposed on a magnetic path formed by the magnetic gap G1, and a compensation coil 60 generating canceling magnetic flux ϕ4 to cancel magnetic flux ϕ2 applied to the magneto-sensitive element R1. According to the present invention, magnetic flux ϕ2 flowing in the magnetic layers 41 and 42 each functioning as a yoke is applied to the magneto-sensitive element R1, so that even when a magnetic field to be measured is weak, it can be detected.
In addition, closed loop control can be performed due to the presence of the compensation coil 60 that cancels magnetic flux ϕ2.