Stretchable device

A stretchable device comprising:

• a resin base member;
• a plurality of strain gauges disposed on the resin base member;
• electrical wiring configured to detect an amount of change in resistance of each of the strain gauges;
• and
• a housing that accommodates the resin base member, the strain gauges, and the electrical wiring, wherein the housing comprises a detection region configured to detect an applied load and a peripheral region having a frame-like shape and surrounding the detection region, when viewed in a direction orthogonal to a planar direction in which the resin base member extends,
• the resin base member comprises:
• a plurality of bodies disposed in the detection region and separated from one another;
• and
• a plurality of hinges disposed in the detection region and coupling the bodies while meandering,
• the strain gauges each comprise:
• a first strain gauge extending from a first end of the hinge to a second end of the hinge;
• and
• a second strain gauge extending from the second end of the hinge to the first end of the hinge,
• a first end of the first strain gauge and a first end of the second strain gauge are coupled to each other at the second end of the hinge,
• the electrical wiring comprises:
• a first potential line disposed over the peripheral region, the bodies, and the hinges and configured to apply a first potential to a second end of the first strain gauge;
• a second potential line disposed over the peripheral region, the bodies, and the hinges and configured to apply a second potential lower than the first potential to a second end of the second strain gauge;
• a coupling line disposed in the peripheral region and coupling the first potential line to the second potential line;
• a first signal line disposed over the peripheral region, the bodies, and the hinges and configured to detect a predetermined potential;
• and
• a second signal line disposed in the peripheral region and configured to detect a predetermined potential,
• the predetermined potential detected by the first signal line is a third potential at a first coupling point at which the first end of the first strain gauge and the first end of the second strain gauge are coupled,
• the predetermined potential detected by the second signal line is a fourth potential at a midpoint of the coupling line,
• one of the first strain gauge and the second strain gauge is an inner peripheral strain gauge disposed on an inner periphery of the hinge,
• the other one of the first strain gauge and the second strain gauge is an outer peripheral strain gauge disposed on an outer periphery of the hinge, and
• the amount of change in resistance of each strain gauge is detected based on a potential difference between the third potential detected from the first signal line and the fourth potential detected from the second signal line.