Apparatus and method for determining the position of a driven coil within a grid of spaced conductors

摘要: A digitizing system includes a first plurality of spaced parallel grid conductors and second orthogonal to the conductors. The location movable coil arranged on pen or cursor is determined for each coarsely by sampling voltage induced in one from signal applied determine whether above below this conductor. Through careful selection, very few can be sampled quickly locate two immediately adjacent center driven coil. ratio voltages present these matched against list known ratios representing various positions between