Strain sensor for detecting movement of measurement target

A sensor, comprising:

• a fixed member comprising a frame;
• and
• a first strain sensor element and a second strain sensor element,
• wherein the first strain sensor element and the second strain sensor element extend across the frame and are disposed such that the first strain sensor element and the second strain sensor element cross each other, and
• wherein the fixed member comprises a first reinforcing part and a second reinforcing part, each of the first reinforcing part and the second reinforcing part being rod-shaped or plate-shaped, and the first reinforcing part and the second reinforcing part extending in mutually opposite directions outwards from outer edges of the frame and along a lengthwise direction of the first strain sensor element.

A sensor, comprising:

• a fixed member comprising a frame;
• a first strain sensor element and a second strain sensor element;
• and
• a first flexible substrate configured to be detachably attached to a measurement target,
• wherein the first strain sensor element and the second strain sensor element extend across the frame and are disposed such that the first strain sensor element and the second strain sensor element cross each other,
• wherein the frame is disposed on the first flexible substrate, and is configured to deform in response to a movement of the measurement target,
• wherein in a first case where the measurement target moves in a first direction, the first strain sensor element elongates in a lengthwise direction of the first strain sensor element, the second strain sensor element shortens in a lengthwise direction of the second strain sensor element, and the movement of the measurement target in the first direction is detectable based on the elongation of the first strain sensor element in the lengthwise direction of the first strain sensor element, and
• wherein in a second case where the measurement target moves in a second direction different from the first direction, the first strain sensor element shortens in the lengthwise direction of the first strain sensor element, the second strain sensor element elongates in the lengthwise direction of the second strain sensor element, and the movement of the measurement target in the second direction is detectable based on the elongation of the second strain sensor element in the lengthwise direction of the second strain sensor element.