Capacitive force and/or pressure sensor having stretchable electrodes

A capacitive force and/or pressure sensor comprising:

• an elastic and stretchable layer comprising a stretchable layer having a first Young's modulus and a first yield strain,
• at least a first stretchable electrode and a second stretchable electrode attached to the elastic and stretchable layer and arranged a first distance apart from each other,
• a flexible foil having a second Young's modulus,
• an electrically conductive wiring attached to the flexible foil, and
• a first electrically conductive layer, wherein
• at least a part of the electrically conductive wiring is coupled to the first stretchable electrode in an electrically conductive manner,
• at least a part of the electrically conductive wiring is coupled to the second stretchable electrode in an electrically conductive manner,
• the stretchable layer, the first and second stretchable electrodes, the flexible foil, and the electrically conductive wiring are left on a same side of the elastic deformable layer,
• the elastic and stretchable layer is arranged in a direction of thickness of the sensor in between the first electrically conductive layer and the first stretchable electrode,
• the first yield strain is at least 10%,
• the first Young's modulus is less than the second Young's modulus, wherein
• the thickness of the flexible foil is at most 0.5 mm,
• a total effective cross-sectional area of the stretchable electrodes is at least 50% of the total cross-sectional area of the stretchable layer, and
• the elastic and stretchable layer comprises an elastic deformable layer;
• and wherein the sensor comprises
• an additional elastic deformable layer and
• a second electrically conductive layer, such that
• the first electrically conductive layer and the second electrically conductive layer are left on opposite sides of the first stretchable electrode, and
• the additional elastic deformable layer is arranged in a direction of thickness of the sensor in between the second electrically conductive layer and the first stretchable electrode.