| 摘要 |
<p>PURPOSE:To attain the input of the coordinate data with use of plural wireless movable matters based on the coil output signal by setting a pair of coils which are separate from each other by a prescribed distance and energized with switch of the frequency. CONSTITUTION:The detection coils 26C - 29C containing a pair of coils con nected in an 8-shape respectively for mutual elimination of the induced voltage are set at the prescribed positions. These coils are energized by an energizing coil 24 with switch of the frequency. Therefore the position information on the resonance coils provided to the movable matters 35A and 35B are detected as the amplitude information on the output signals VX1, VX2, VY1 and VY2 with resonance frequency of the resonance coils and based on the center axis O of each detection coil. Thus it is possible to identify the matters 35A and 35B and to input the coordinate data with input of the phase comparison result obtained to the drive signal of the coil 24 carried out on the basis of the drive frequency of the coil 24.</p> |
