MAGNETIC THREE-DIMENSIONAL POSITION DETECTOR AND DETECTION METHOD

PROBLEM TO BE SOLVED: To provide a magnetic three-dimensional position detector and detection method capable of expressing actual magnetic field pattern with sufficient accuracy and raising the accuracy of position estimation of a reception coil. SOLUTION: The magnetic three-dimensional position detector produces alternating magnetic fields with frequencies different for a plurality of transmission coils S1 to S6 and a three-dimensional position of the reception coil are measured by using the reception signal induced by the reception coil. By using a magnetic field function of divided polynomial function having coordinates position in the measuring region as an explanatory variable, signal intensity induced in the reception coil is expressed for the relative position relation among the transmission coils S1 to S6 . Furthermore, the position of the reception coil is measured with a means for calculating the three-dimensional position of the reception coil and a means above, so that the difference between the signal intensity predicted from the magnetic field function and that actually measured becomes minimum.