Patent ID: 6952201
Filing Date: 2005-10-04
Classification: G06F

Abstract:
1. A three-dimensional information detecting device, comprising: an indicator having at least one indicating coil; a plurality of sensor coils that are disposed along a detection surface so as to intersect each other, and that are electromagnetically coupled to said indicating coil; a selector that selectively switches said sensor coils; a signal generator that generates signals to be communicated between the indicating coil and the selected sensor coil, by electromagnetic coupling; a signal detector that detects signals received by the selected sensor coil or the indicating coil; and a calculator that calculates a position and a direction of said indicator in a three-dimensional space, based on the detection signals detected by said signal detector, wherein said calculator calculates an X-axis coordinate and a Y-axis coordinate of said indicator, based on signals of at least three points in the vicinity of the peak value of the detection signals detected by said signal detector; and wherein said calculator determines a height of said indicator from the width of the coordinate at a predetermined level value of the detection signals.