To accurately detect the position of a sensor coil by reducing an error caused by crosstalk generated between coils.
The jaw movement measuring device detects the relative position of a sensor coil 2 with respect to an exciting coil 1 from an alternating-current signal induced from the exciting coil 1 connected to an alternating-current power source 3 to the sensor coil 2. The measuring device corrects an alternating-current signal induced to an X-axis coil 2a of the sensor coil 2 using a crosstalk signal induced from a Y-axis coil 2b and a Z-axis coil 2c of the sensor coil 2, corrects an alternating-current signal induced to the Y-axis coil 2b of the sensor coil 2 using the crosstalk signal induced from the X-axis coil 2a and the Z-axis coil 2c of the sensor coil 2, corrects an alternating-current signal induced to the Z-axis coil 2c of the sensor coil 2 using the crosstalk signal induced from the X-axis coil 2a and the Y-axis coil 2b of the sensor coil 2, and calculates the position of a tooth on which the sensor coil 2 is fixed using the alternating-current signal corrected by use of the crosstalk signal.
SHIGEMOTO SHUJI
SATSUMA TOYOKO
ISHIKAWA TERUAKI
Toshisu Koji