US Patent 9933867 Active pen capacitive displacement gauge

An active capacitive pen including: a tip; a first electrode mechanically connected to the tip that displaces in response to a force applied to the tip; a second electrode that is isolated from the tip, where the first electrode and the second electrode are of different types (e.g., transmitter electrode, receiver electrode); and a measurement module that detects a change in capacitance resulting from displacement of the first electrode relative to the second electrode.