Capacitive sensor

Abstract

A capacitive sensor comprising a first electrically conductive wire that is flexible and stretchable, a compressible layer, an integral reinforcement structure, and a first electrode for measuring a capacitance and coupled to the first electrically conductive wire. The first electrically conductive wire is attached to a first joint for connecting the first wire to another electrically conductive structure, such as a flexible circuit board or a connector. The capacitive sensor is dividable to a first part of the capacitive sensor and to a second part of the capacitive sensor, the first and second parts extending through the sensor in a direction (Sz) of thickness of the sensor. The first electrically conductive wire extends from the first joint via the second part of sensor to the first part of the sensor and further to the first electrode. A resilience of the second part is improved. Therefore, [A] the second part of the sensor comprises a second part of the compressible layer, wherein an in-plane stiffness of the second part of the compressible layer is less than an in-plane stiffness of the first part of the compressible layer or [B] the compressible layer does not extend to the second part of the sensor.