ROTATION MAGNETIC FIELD SENSOR

• Main Authors: MOCHIZUKI SHINICHIRO, KAMI MASASHI
• Format: Patent
• Language: English
• Published: 24.02.2014
• Subjects: ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVEREDIN A SINGLE OTHER SUBCLASS; MEASURING; MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR; PHYSICS; TARIFF METERING APPARATUS; TESTING

PROBLEM TO BE SOLVED: To reduce errors caused by generation of magnetic anisotropy in a magnetic detection element.SOLUTION: A rotation magnetic field sensor 1 comprises: detection circuits 10, 20, and 30 for generating signals S1, S2, and S3 respectively; and arithmetic circuits 61 and 62. The detection circuit 10 comprises a first MR element, and the detection circuit 30 comprises a third MR element. The detection circuit 20 comprises a second MR element set with first magnetic anisotropy. The first arithmetic circuit 61 obtains correction information for correcting errors, generated in detection values s, and caused by second magnetic anisotropy generated in the first MR element, on the basis of a transition mode of a pair of the signals S1 and S2 obtained when the direction of rotation magnetic field rotates in a predetermined range. The arithmetic circuit 62 calculates correction amounts regarding the signals S1 and S3 with the signals S1 and S3 and the correction information, calculates the signals S1 and S3 corrected by reduction of the correction amounts from the signals S1 and S3, and, based on the corrected signals S1 and S3, calculates the detection values s.