Patent ID: 7958789

Claim:
A capacitive sensor comprising: a dielectric layer made of an elastomer and having stretchability; and a pair of electrodes arranged via the dielectric layer, wherein the pair of electrodes is constituted by an elastomer composition containing the elastomer and conductive fillers, in a percolation curve expressing a relationship between a blended amount of the conductive fillers and an electric resistance in the elastomer composition, the blended amount (critical volume fraction: φc) of the conductive fillers at a first polarity change point at which the electric resistance decreases to cause a transition between insulator and conductor is 25 vol % or less, the pair of electrodes is expandable and contractible in accordance with a deformation of the dielectric layer and exhibits little conductivity variation when the pair of electrodes expands and contracts, at least one of the dielectric layer and the electrodes is formed by a printing method using a dielectric layer coating containing a formation component of the dielectric layer or an electrode coating containing a formation component of the electrode, and the capacitive sensor detects a deformation on the basis of an electrostatic capacity variation between the pair of electrodes, and has stretching flexibility.