C & N Inc.

Masahito Ito

Yasuhiro Tamura

A control devicecalibrates a magnetic-field sensorby computation. A computation unitcalculates the magnetic-field intensity based upon the outputs of X-axis, Y-axis, and Z-axis magnetic-field detection devices of the magnetic-field sensor. Such calculation is performed for four or more different points. The calculation is performed such that at least one point is not positioned on a plane including the other points. The computation unitconverts the outputs from the X-axis, Y-axis, and Z-axis magnetic-field detection devices of the magnetic-field sensorinto three-dimensional spatial coordinate points. Then, the computation unitcreates a sphere on which the four or more coordinate points thus obtained are positioned. The coordinate point of the center of the sphere thus created represents the magnetic-field offset. The interfering magnetic-field components in the X-axis, Y-axis, and Z-axis directions thus obtained are subtracted from the outputs of the X-axis, Y-axis, and Z-axis magnetic-field detection devices of the magnetic sensor, whereby calibration is made.

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Saitama, Japan

Masahito Ito