| 摘要 |
In a coordinate input apparatus, a compensation loop is installed to surround a main loop, each main loop is scanned thereby rough region where a coordinate indicating tool exists can be detected, compensation value stored in a first memory means is referred corresponding to the detected rough region and current value to be transmitted to the compensation loop is adjusted thereby shift of the polarity inversion position of the magnetic field intensity is suppressed and interpolation value in the rough region is calculated, and correction value stored in a second memory means is drawn for the interpolation value.
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