Stretchable device
A stretchable device includes a resin base member, a signal line, and a strain gauge. The resin base member includes: bodies disposed separately from each other; and hinges that couple the bodies while meandering. Each hinge includes: a base and bends. The bends include a first bend coupled to the base. The first bend includes a first inner peripheral portion and a first outer peripheral portion with respect to a center in a width direction orthogonal to a length direction in which the hinge extends. The base includes an inner peripheral coupling portion coupled to the first inner peripheral portion and an outer peripheral coupling portion coupled to the first outer peripheral portion with respect to the center in the width direction. The signal line is provided to the hinge. An imaginary center line passing through the center of the signal line overlaps the outer peripheral coupling portion.
1 . A stretchable device comprising:
a resin base member; and
a signal line and a strain gauge stacked on the resin base member, wherein
the resin base member comprises:
a plurality of bodies disposed separately from each other; and
a plurality of hinges that couple the bodies while meandering,
the hinges each comprise:
a base linearly extending from the body; and
a plurality of bends,
the bends include a first bend coupled to the base,
the first bend comprises a first inner peripheral portion positioned on an inner peripheral side and a first outer peripheral portion positioned on an outer peripheral side with respect to a center in a width direction serving as a boundary, the width direction being orthogonal to a length direction in which the hinge extends,
the base comprises an inner peripheral coupling portion coupled to the first inner peripheral portion and an outer peripheral coupling portion coupled to the first outer peripheral portion with respect to the center in the width direction serving as a boundary,
the signal line is provided to the hinge, and
an imaginary center line passing through the center of the signal line in the width direction overlaps the outer peripheral coupling portion when viewed in a stacking direction in which the signal line is stacked on the resin base member.
2 . The stretchable device according to claim 1 , wherein
the bends include a second bend coupled to the first bend,
the second bend comprises a second inner peripheral portion positioned on the inner peripheral side and a second outer peripheral portion positioned on the outer peripheral side with respect to the center in the width direction serving as a boundary,
the second inner peripheral portion is coupled to the first outer peripheral portion,
the second outer peripheral portion is coupled to the first inner peripheral portion,
the strain gauge is provided to the hinge,
the strain gauge comprises:
two strain detectors overlapping the first inner peripheral portion and the second inner peripheral portion or the first outer peripheral portion and the second outer peripheral portion when viewed in the stacking direction; and
an intersection that extends in the width direction and couples the two strain detectors, and
a corner between the strain detector and the intersection has a tapered shape.
3 . The stretchable device according to claim 1 , wherein each of the hinges is S-shaped.
4 . The stretchable device according to claim 1 , wherein the signal line crosses the strain gauge in areas of each of the hinges, the areas being between the bends adjacent to each other.
5 . A stretchable device comprising:
a resin base member; and
a signal line and a strain gauge stacked on the resin base member, wherein
the resin base member comprises:
a plurality of bodies disposed separately from each other; and
a plurality of hinges that couple the bodies while meandering,
the hinges each comprise:
a base linearly extending from the body; and
a plurality of bends,
the bends include:
a first bend coupled to the base; and
a second bend coupled to the first bend,
the first bend comprises a first inner peripheral portion positioned on an inner peripheral side and a first outer peripheral portion positioned on an outer peripheral side with respect to a center in a width direction serving as a boundary, the width direction being orthogonal to a length direction in which the hinge extends,
the second bend comprises a second inner peripheral portion positioned on the inner peripheral side and a second outer peripheral portion positioned on the outer peripheral side with respect to the center in the width direction serving as a boundary,
the second inner peripheral portion is coupled to the first outer peripheral portion,
the second outer peripheral portion is coupled to the first inner peripheral portion,
the strain gauge is provided to the hinge,
the strain gauge comprises:
strain detectors overlapping the first inner peripheral portion and the second inner peripheral portion or the first outer peripheral portion and the second outer peripheral portion when viewed in a stacking direction in which the signal line is stacked on the resin base member; and
an intersection that extends in the width direction at a boundary between the first bend and the second bend and couples the strain detectors, and
a corner between the strain detector and the intersection has a tapered shape.