Stretchable device

1 . A stretchable device comprising:

a stretchable substrate extending in a planar direction including a first direction and a second direction intersecting the first direction; and

a pair of stretchable resin layers with the stretchable substrate interposed therebetween in a stacking direction intersecting the planar direction, wherein

one of the stretchable resin layers has a surface facing a side opposite to the stretchable substrate,

the surface has, when viewed in the stacking direction, a center region positioned at the center of the surface and a frame region positioned at ends of the surface and surrounding the center region,

the stretchable substrate comprises a resin base member and an array layer disposed in the stacking direction,

the resin base member comprises a hinge meandering and extending in the planar direction,

the hinge comprises a plurality of arcs formed in an arc shape when viewed in the stacking direction,

the arcs have a center region arc disposed in the center region and a frame region arc disposed in the frame region, and

the radius of curvature of the frame region arc is smaller than the radius of curvature of the center region arc.

2 . The stretchable device according to claim 1 , wherein the frame region arc and the center region arc are similar in shape.

3 . The stretchable device according to claim 2 , wherein

the resin base member comprises a plurality of the hinges,

the hinges comprise:

a center region hinge disposed in the center region and having the center region arc; and

a frame region hinge disposed in the frame region and having the frame region arc, and

the frame region hinge and the center region hinge are similar in shape.

4 . The stretchable device according to claim 3 , wherein

the resin base member comprises a plurality of bodies to which ends of a plurality of the hinges are coupled,

the bodies comprise:

a center region body disposed in the center region and coupled to the center region hinge; and

a frame region body disposed in the frame region and coupled to the frame region hinge,

the frame region body and the center region body are similar in shape, and

a reduction ratio of the frame region hinge to the center region hinge is equal to a reduction ratio of the frame region body to the center region body.

5 . The stretchable device according to claim 1 , wherein

the array layer includes a plurality of wiring lines disposed in the frame region and circumferentially extending outside the center region,

the wiring lines comprise:

an inner peripheral wiring line; and

an outer peripheral wiring line disposed on an outer side than the inner peripheral wiring line, and

the width of the outer peripheral wiring line is larger than the width of the inner peripheral wiring line.

6 . The stretchable device according to claim 1 , wherein

the resin base member comprises a plurality of the hinges,

the hinges comprise a frame region hinge disposed in the frame region and having the frame region arc,

the frame region hinge is provided with a plurality of wiring lines extending along the frame region hinge, and

the frame region hinge has a slit that is formed between the wiring lines when viewed in the stacking direction and that divides the frame region hinge in a width direction.

7 . The stretchable device according to claim 1 , wherein

the resin base member comprises a dummy portion not provided with wiring, and

the dummy portion overlaps an imaginary line indicating a boundary between the center region and the frame region when viewed in the stacking direction.