Approach position input device

摘要

The invention relates to an approach position input device which includes a plurality of antennas (lx, ly) arranged in the form of a lattice. An oscillator (3) applies a high-frequency ac voltage to the antennas. A signal processing circuit (15) processes signals from the antennas. A change-over switch (4) including switching elements (4a) sequentially changes over a connection between the antennas and the signal processing circuit. CPU (11) sends a selection signal to the change-over switch for antenna selection. CPU (11) calculates an approach position of a human body according to signals from the signal processing circuit (15). CPU (11) instructs the change-over switch (4) to apply the ac voltage from the oscillator (3) only to the antenna selected according to the selection signal.