Position detecting apparatus.

摘要

A position detecting apparatus for detecting a position pointed by an input pen which comprises: a position detection section (11) constituted by first and second coil groups (67, 73) each composed of a plurality of loop coils; an input pen (12) having a tuning circuit (86) having a predetermined frequency as a tuning frequency; selector means (13, 14) for successively selecting the loop coils of the first and second coil groups of the position detection section one by one; signal generation means (28) for supplying an A.C. signal of the predetermined frequency to the loop coils; signal detection means (24 to 27) for detecting the A.C. signal of the predetermined frequency from the loop coils; and controller means (29) for identifying the position pointed by the position pointer on the basis of the A.C. signal detected by the signal detection means from among the loop coils of the first and second coil groups, whereby the position pointed by the input pen can be detected on the basis of the induced voltages obtained in the first and second coil groups. Because each of the first and second coil groups is constituted by a plurality of patterned coil portions, the position detecting apparatus can be made so as to have high resolution with the reduced number of coils.