Magnetic Field Measuring Device

A magnetic field measuring device that detects the strength of a magnetic field produced from a magnetic field-producing body, comprising:

• first to fourth magnetoelectric transducers;
• magnetic convergence plates made up of a magnetic body;
• and
• a calculation unit that calculates the strength of a magnetic field applied in a horizontal direction and/or a vertical direction with respect to a magneto-sensing surface of the magnetoelectric transducers;
• wherein the magnetic convergence plates are placed in the vicinity of the first to fourth magnetoelectric transducers so as to
• convert magnetic field vectors produced in a horizontal direction with respect to the magneto-sensing surface of the first magnetoelectric transducer and the magneto-sensing surface of the second magnetoelectric transducer into magnetic field vectors in a vertical direction with respect to the magneto-sensing surface of the first magnetoelectric transducer and the magneto-sensing surface of the second magnetoelectric transducer, and also in opposite directions at the respective magneto-sensing surfaces, and further,
• convert magnetic field vectors produced in a horizontal direction with respect to the magneto-sensing surface of the third magnetoelectric transducer and the magneto-sensing surface of the fourth magnetoelectric transducer into magnetic field vectors in a vertical direction with respect to the magneto-sensing surface of the third magnetoelectric transducer and the magneto-sensing surface of the fourth magnetoelectric transducer, and also in opposite directions at the respective magneto-sensing surfaces, and
• wherein the calculation unit comprises a first calculation block that adds or subtracts outputs from the first to fourth magnetoelectric transducers to output a calculation result.