| 摘要 |
PROBLEM TO BE SOLVED: To provide a magnetic field detection sensor with which it is possible to prevent a decline in detection accuracy due to fluctuations of an environment temperature, and to detect a minute magnetic field by taking into account positional deviation in manufacturing and the downsizing of a product.SOLUTION: The magnetic field detection sensor comprises: a bridge circuit to which are connected a plurality of magnetoresistance effect elements 10, 20, 30, 40 whose resistance values change in accordance with the direction of a detection magnetic field, and which is configured so as to output a differential voltage between prescribed connection points; a magnetic substance for collecting detection magnetic fields near the center of the bridge circuit and causing the direction of magnetic fields to change; a magnetic field generating conductor 100 for applying, to the magnetoresistance effect elements, a magnetic field whose direction is opposite the direction of the detection magnetic field; a differential arithmetic circuit to which the differential voltage of the bridge circuit is inputted, and which sends, to the magnetic field generating conductor, a feedback current for causing a magnetic field whose direction is opposite the direction of the detection magnetic field to be generated in the magnetic field generating conductor; and a voltage conversion circuit for outputting the feedback current as a voltage value, the magnetic field generating conductor and the magnetoresistance effect elements being formed in the same laminate 1. |
