Stretchable device

A stretchable device comprising:

• a resin base member extending in a planar direction comprising a first direction and a second direction intersecting the first direction;
• 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 the planar direction,
• the resin base member comprises:
• a plurality of bodies disposed in the detection region and separated from one another in the first direction and the second direction;
• a plurality of longitudinal hinges each disposed in the detection region, meandering and extending in the first direction, and coupling the bodies adjacently disposed in the first direction;
• and
• a plurality of lateral hinges each disposed in the detection region, meandering and extending in the second direction, and coupling the bodies adjacently disposed in the second direction,
• the strain gauges comprise:
• a longitudinal strain gauge disposed on the longitudinal hinge;
• and
• a lateral strain gauge disposed on the lateral hinge,
• the electrical wiring comprises:
• an electrical wiring line for longitudinal strain configured to detect an amount of change in resistance of the longitudinal strain gauge;
• and
• an electrical wiring line for lateral strain configured to detect an amount of change in resistance of the lateral strain gauge,
• the electrical wiring line for longitudinal strain and the electrical wiring line for lateral strain each comprise:
• a first potential line disposed over the peripheral region, the bodies, and the longitudinal hinges and configured to apply a first potential to a first end of a corresponding one of the strain gauges;
• a second potential line disposed over the peripheral region, the bodies, and the longitudinal hinges and configured to apply a second potential lower than the first potential to a second end of a corresponding one of the strain gauges;
• 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 longitudinal 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 second end of a corresponding one of the strain gauges is coupled to the second potential line,
• the predetermined potential detected by the second signal line is a fourth potential at a midpoint of the coupling line, 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.