Coordinate input device, control method therefor, and control program for implementing the method

摘要: A coordinate input device which is capable of performing accurate and appropriate detection a pen-up/pen-down state over the entire surface, based on motion an indication tool or like in direction substantially perpendicular to realizing function equivalent that equipped with communication without using tool. light-shaded position shaded from light surface by detected, then coordinates are calculated. Further, determined temporal change shading position.