AUTOMATIC COORDINATE DETERMINING DEVICE

摘要

An electrical device for determining the position coordinates of patterns such as graphs and characters which are plotted on a drawing. The device includes a tablet on which a plurality of conductive lines are formed parallel to each other, and a probe consisting of circular coils which are in mutual inductive relation with the conductive lines. The device determines the coordinate of the probe on the tablet, by selecting and filtering the mixed signal which is produced when scanning signals to the conductive lines combine with induced signals between the probe and the conductive lines. A wireless probe may be used and a plurality of probes can be used on one tablet.