Specified Position Detection Device

摘要

To improve accuracy of coordinate specified results.;In a coordinate position specifying surface 3 that has an edge region surrounding an inner region, based on detection outputs V4 and V3 of an edge-region first loop coil J4 and adjacent inner-region second loop coil J3, and a coil pitch K02 between the first and second loop coils J4 and J3, a coordinate deviation from the first loop coil J4 to a peak coordinate value p of a specified coordinate detection output W0 is detected. Therefore, it is possible to realize a specified position detection device that can expand, with high accuracy, position coordinates specified by a position specifying tool 5 in such a way as to cover the edge region.

主权项

1. A specified position detection device that obtains, when a position is specified by an electromagnetic coupling-type position specifying tool on a coordinate position specifying surface on which a plurality of loop coils making up an XY coordinate system are disposed, a specified coordinate detection output from a loop coil electromagnetically coupled with the position specifying tool among the loop coils located at the specified position, characterized in that:
based on a first position detection output value, which is obtained from a first loop coil located in an edge region surrounding an inner region among the plurality of loop coils, a second position detection output value, which is obtained from second loop coils located in the inner region that are adjacent to an inner side of the first loop coil, and a first coil pitch between the first and second loop coils, an interpolation operation is performed of a coordinate deviation value from the first loop coil to a peak coordinate value of the specified coordinate detection output in order to detect coordinates of the position specified by the position specifying tool; and the first coil pitch is a different value from a value of the second coil pitch between the second loop coils located in the inner region.