US 12,117,506 B2
Magnetic field detection device and magnetic field detection device array
Takato Fukui, Tokyo (JP); Tamon Kasajima, Tokyo (JP); Yuichiro Yamaji, Tokyo (JP); Taiju Akushichi, Tokyo (JP); Osamu Harakawa, Tokyo (JP); and Makoto Kameno, Tokyo (JP)
Assigned to TDK Corporation, Tokyo (JP)
Appl. No. 17/927,134
Filed by TDK Corporation, Tokyo (JP)
PCT Filed May 10, 2021, PCT No. PCT/JP2021/017622
§ 371(c)(1), (2) Date Nov. 22, 2022,
PCT Pub. No. WO2021/241174, PCT Pub. Date Dec. 2, 2021.
Claims priority of application No. 2020-092889 (JP), filed on May 28, 2020.
Prior Publication US 2023/0204686 A1, Jun. 29, 2023
Int. Cl. G01R 33/00 (2006.01); G01R 33/09 (2006.01)
CPC G01R 33/0041 (2013.01) [G01R 33/091 (2013.01)] 14 Claims
OG exemplary drawing
 
1. A magnetic field detection device comprising:
a bobbin;
a cancel coil wound around a winding core part of the bobbin;
first and second magnetic sensors fixed to mutually different positions of the bobbin and configured to detect a magnetic field component in mutually a same direction; and
a feedback circuit that makes a cancel current flow in the cancel coil according to an output signal of the first magnetic sensor to cancel an environmental magnetic field in a cancel space,
wherein the second magnetic sensor is disposed within the cancel space.