Bend inducible self-folding Origami flexures and microsystems
The present disclosure relates to a spatio-temporal stimulus responsive foldable structure. The structure may have a substrate having at least a region formed to provide engineered weakness to help facilitate bending or folding of the substrate about the region of engineered weakness. The substrate is formed to have a first shape. A stimulus responsive polymer (SRP) flexure is disposed at the region of engineered weakness. The SRP flexure is responsive to a predetermined stimulus actuation signal to bend or fold in response to exposure to the stimulus actuation signal, to cause the substrate to assume a second shape different from the first shape.
1. A spatio-temporal stimulus responsive foldable structure, comprising:
a substrate having at least a region formed to provide engineered weakness to help facilitate bending or folding of the substrate about the region of engineered weakness, the substrate formed to have a first shape; and
a stimulus responsive polymer (SRP) flexure disposed at the region of engineered weakness, the SRP flexure being responsive to a predetermined stimulus actuation signal to bend or fold in response to exposure to the stimulus actuation signal, to cause the substrate to assume a second shape different from the first shape.
2. The structure of claim 1 , wherein the engineered weakness in the substrate comprises a groove, and the SRP flexure is disposed in the groove.
3. The structure of claim 1 , wherein the engineered weakness forms a gap in the substrate to separate the substrate into two discrete portions, and the SRP flexure is disposed in the gap.
4. The structure of claim 1 , wherein the region of engineered weakness comprises an entire portion of the substrate.
5. The structure of claim 4 , wherein the substrate forms a planar substrate having opposing surfaces, and the SRP flexure is disposed on at least a portion of one of the opposing surfaces.
6. The structure of claim 1 , wherein the substrate further comprises at least one electrically responsive probe-like element formed thereon.
7. The structure of claim 1 , wherein the first shape comprises a planar shape, and the second shape comprises a non-planar, 3D shape wherein portions of the substrate are folded to extend at least one of:
non-parallel to one another; or
parallel to one another.
8. The structure of claim 1 , wherein the SRP flexure is responsive to an optical signal.
9. The structure of claim 8 , wherein the SRP flexure is responsive to the optical signal when the optical signal has a specific predetermined wavelength.
10. The structure of claim 1 , wherein the SRP flexure is responsive to at least one of:
a thermal signal;
a magnetic field signal;
an electric field signal;
a voltage signal;
a current signal; or
a fluid signal;
which is applied by the predetermined stimulus actuation signal.
11. The structure of claim 1 , wherein the SRP flexure is formed from a plurality of distinct layers which each respond differently to the predetermined stimulus actuation signal.
12. The structure of claim 11 , wherein the plurality of distinct layers configures the SRP flexure to provide a depth differentiated response gradient in response to the stimulus actuation signal.
13. The structure of claim 1 , wherein the SRP flexure is configured to produce at least one of a tensile stress or a compressive stress in response to the predetermined stimulus actuation signal.
14. The structure of claim 1 , further comprising an additional SRP flexure disposed on the substrate at an additional region of engineered weakness of the structure, wherein the additional region of engineered weakness is spaced apart from the region of engineered weakness, to produce portions of the substrate which fold in opposite directions extending away from one another in response to the predetermined stimulus actuation signal.