Input device

An input device comprising:

• a position detection sensor of an electromagnetic induction type;
• a plurality of operation parts respectively including a plurality of position indicators that, in operation, respectively indicate a plurality of positions through a plurality of interactions with the position detection sensor and accepts a plurality of predetermined operations, the operation parts being disposed on an input surface that serves as a position detection region of the position detection sensor;
• an operation detection circuit that, in operation, detects the operations accepted by the operation parts, based on the interactions between the position indicators of the operation parts and the position detection sensor;
• and
• a control signal output circuit that, in operation, outputs a plurality of control signals corresponding to the operation detected by the operation detection circuit,
• wherein the position indicators of the operation parts include a plurality of coils of a plurality of resonant circuits including a plurality of capacitors and the coils,
• wherein the coils, in operation, are coupled with the position detection sensor through electromagnetic induction,
• wherein the plurality of resonant circuits respectively have a plurality of resonant frequencies that are different from each other,
• wherein the operation detection circuit, in operation, identifies the operation parts based on the resonant frequencies that are different from each other,
• wherein one of the operation parts, in operation, accepts an operation that changes a height position of one of the position indicators with respect to the input surface,
• wherein the one of the operation parts includes an operation element, a variable capacitor, a substrate coupled to an end surface of the operation element, a pressure transmission member that extends through a hole formed in the substrate, and an elastic member that, in operation, is elastically displaced when a pressing force is applied to the operation element and that returns the operation element to an original height position when the pressing force is no longer applied to the operation element,
• wherein one of the capacitors of one of the position indicators included in the one of the operation parts is electrically coupled in parallel with the variable capacitor,
• wherein the one of the capacitors is disposed on the substrate at a position that is different from a position of the hole formed in the substrate,
• wherein a capacitance of the one of the capacitors of the one of the position indicators included in the one of the operation parts, in operation, varies based on the pressing force applied to the operation element,
• wherein the operation detection circuit, in operation, detects a change in the capacitance of the capacitor of the one of the position indicators included in the one of the operation parts based on the operation accepted by the one of the operation parts,
• wherein the control signal output circuit, in operation, outputs a control signal corresponding to the change in capacitance of the capacitor of the one of operation parts that is detected by the operation detection circuit.