Electrostatic input device with high-accuracy position detection using capacitance threshold ratios

An electrostatic input device, comprising:

• a plurality of sensor electrodes disposed corresponding to a plurality of operation regions on an operation surface on which an operation input is performed;
• and
• a computer including a memory storing one or more programs and a processor coupled to the memory, the computer being configured to compare a plurality of capacitance thresholds, which are assigned to the plurality of sensor electrodes, respectively, with capacitance of the plurality of sensor electrodes, respectively, and check one or more sensor electrodes having the capacitance exceeding the capacitance threshold assigned to a corresponding sensor electrode,
• wherein, the computer is configured to, when the one or more sensor electrodes having the capacitance exceeding the capacitance threshold assigned to the corresponding sensor electrode include two or more sensor electrodes and the two or more sensor electrodes are adjacent to each other, identify, among the two or more sensor electrodes, the sensor electrode on which the operation input is performed based on a ratio between the capacitance of each of the two or more sensor electrodes and the capacitance threshold assigned to the corresponding sensor electrode.