Capacitive sensor
First Claim
1. A capacitive sensor comprising:
- a dielectric layer made of an elastomer and having stretchability; and
a pair of electrodes arranged via the dielectric layer, whereinthe 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;
φ
c) 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, andthe capacitive sensor detects a deformation on the basis of an electrostatic capacity variation between the pair of electrodes, and has stretching flexibility.
2 Assignments
0 Petitions
Accused Products
Abstract
A capacitive sensor includes a dielectric layer made of an elastomer and a pair of electrodes arranged via the dielectric layer, and detects deformation on the basis of electrostatic capacity variation between the pair of electrodes. The pair of electrodes contain an elastomer and conductive fillers filled into the elastomer, are expandable and contractible in accordance with deformation of the dielectric layer, and exhibit little conductivity variation even when the pair of electrodes expand and contract. 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.
-
Citations
14 Claims
-
1. 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;
φ
c) 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. - View Dependent Claims (2, 3, 4, 5, 6)
-
-
7. A capacitive sensor comprising:
-
an integrally stretchable sensor main body including a dielectric layer made of an elastomer, at least one belt-shaped surface side electrode provided on a surface side of the dielectric layer, the surface side electrode being formed to include an elastomer and conductive fillers filled into the elastomer and including a surface side connection portion, at least one belt-shaped back side electrode provided on a back side of the dielectric layer, the back side electrode being formed to include an elastomer and conductive fillers filled into the elastomer and including a back side connection portion, a plurality of detection portions formed by an intersection between the surface side electrode and the back side electrode when seen from a surface-back direction, a surface side conductor that is connected to the surface side connection portion, formed to include an elastomer and conductive particles filled into the elastomer, and has a smaller electric resistance than the electric resistance of the surface side electrode, and a back side conductor that is connected to the back side connection portion, formed to include an elastomer and conductive particles filled into the elastomer, and has a smaller electric resistance than the electric resistance of the back side electrode; and a calculation portion that is electrically connected to the surface side conductor and the back side conductor, separates an electric resistance corresponding to a distance from the surface side connection portion of the surface side electrode to each of the detection portions and the electric resistance corresponding to a distance from the back side connection portion of the back side electrode to each of the detection portions from an impedance detected from the surface side conductor and the back side conductor, extracts an electrostatic capacity of the each detection portion, and calculates a surface pressure distribution on the sensor main body from the electrostatic capacity of the each detection portion. - View Dependent Claims (8, 9, 10, 11, 12, 13, 14)
-
Specification