Method executed by sensor controller of electromagnetic resonance system, sensor controller, and position detection device

Abstract

A position detection device includes a plurality of linear electrodes extending in a first direction, a plurality of coils extending in a second direction, and a sensor controller configured to: in a first half of each of pen signal detection periods, send an alternating magnetic field by supplying first and second alternating currents to the plurality of linear electrodes; in a second half of each of the pen signal detection periods, connect a defined number of two or more coils selected from the plurality of coils in connection modes having different connection polarities in the pen signal detection periods and detect a pen signal level result value; and separately acquire the pen signal level for each of the defined number of two or more coils by performing a restoration operation according to the connection polarities on the result values detected in the pen signal detection periods.