POSITION DETECTING DEVICE

摘要

PURPOSE:To eliminate the error data as the invalid data even when two pieces of error data are continuous by performing the prescribed arithmetic operations to the coordinate data inputted continuously in order to identify the valid and invalid data respectively. CONSTITUTION:When a stylus B is moved on a tablet plate A, the X and Y data on the points (Pn, Pn+1 and Pn+2) are inputted to a data processing means D form a data generating means C every fixed time. Then the means D calculates the formulas ¦Pn+2-Pn+1¦=D1 and ¦Pn+1-Pn¦=D2 for the optional coordinate data Pn, Pn+1 and Pn+2 which are continuously inputted. Then at least one of these three coordinate data is defined as a valid data when both D1 and D2 are kept within the relative distance value L. Otherwise an invalid data is decided. Thus it is possible to eliminate the error data as the invalid data even when two pieces of error data are continuous.