US 12,270,870 B2
Magnetic sensor and biomagnetic measurement device
Ippei Akita, Ibaraki (JP); Michiharu Yamamoto, Aichi (JP); Hitoshi Aoyama, Aichi (JP); and Takeshi Kawano, Aichi (JP)
Assigned to NATIONAL INSTITUTE OF ADVANCED INDUSTRIAL SCIENCE AND TECHNOLOGY, (JP); and AICHI STEEL CORPORATION, (JP)
Appl. No. 18/258,116
Filed by NATIONAL INSTITUTE OF ADVANCED INDUSTRIAL SCIENCE AND TECHNOLOGY, Tokyo (JP); and AICHI STEEL CORPORATION, Aichi (JP)
PCT Filed Dec. 21, 2021, PCT No. PCT/JP2021/047409
§ 371(c)(1), (2) Date Jun. 16, 2023,
PCT Pub. No. WO2022/138667, PCT Pub. Date Jun. 30, 2022.
Claims priority of application No. 2020-214191 (JP), filed on Dec. 23, 2020.
Prior Publication US 2024/0019506 A1, Jan. 18, 2024
Int. Cl. G01R 33/09 (2006.01); G01R 33/00 (2006.01); G01R 33/06 (2006.01); A61B 5/05 (2021.01)
CPC G01R 33/091 (2013.01) [G01R 33/0017 (2013.01); G01R 33/063 (2013.01); A61B 5/05 (2013.01)] 7 Claims
OG exemplary drawing
 
1. A magnetic sensor comprising:
a magneto-sensitive body whose electromagnetic properties change under an action of an external magnetic field;
a coil disposed to obtain an induced voltage proportional to the external magnetic field;
a sampler configured to sample the induced voltage generated in the coil and obtain a sampling voltage; and
an automatic correction circuit configured to relatively adjust a rise timing of a magneto-sensitive body clock for driving the magneto-sensitive body and a rise timing of a sampler clock for driving the sampler according to the sampling voltage, wherein
the automatic correction circuit detects a delay time until the sampling voltage reaches its first peak by observing displacement of the sampling voltage for a predetermined period after the magneto-sensitive body clock rises, and sets the rise timings of the magneto-sensitive body clock and the sampler clock by shifting the rise timings back and forth by a time corresponding to the delay time.