Load sensor and load detecting device
AssigneeAlps Electric Co., Ltd.
InventorsMitsuru Saito, Mikio Sekine
Life of this patent
Estimating the term…
Abstract
A load sensor is provided with a seat mounting hole between both end parts of a rectangular plate-like main body portion of a load receiving member. A plurality of strain detecting elements the resistance value of each of which changes depending on the amount of strain of the main body portion are disposed around the seat mounting hole. In plan view of the load receiving member, the center point of the seat mounting hole is offset from the center point of the arrangement of the plurality of strain detecting elements toward a part of the load receiving member that has relatively high rigidity.
Claims12
A load sensor comprising:
- a plate-like load receiving member having side body mounting holes formed at respective sides of the plate-like load receiving member, a seat mounting hole formed at a center position between the side body mounting holes, a pair of supporting portions and a load receiving portion provided between the pair of supporting portions;
- and
- a plurality of strain detecting elements disposed around the load receiving portion, the resistance value of each of the respective plurality of strain detecting elements changing depending on the amount of strain of the load receiving member,
- wherein in plan view of the load receiving member, the center point of the load receiving portion is offset from the center point of the arrangement of the plurality of strain detecting elements toward a part of the load receiving member that has relatively high rigidity.
A load sensor comprising:
- a plate-like load receiving member having side body mounting holes formed at respective sides of the plate-like load receiving member, a seat mounting hole formed at a center position between the side body mounting holes, a pair of supporting portions and a load receiving portion provided between the pair of supporting portions;
- and
- a plurality of strain detecting elements disposed around the load receiving portion, the resistance value of each of the respective plurality of strain detecting elements changing depending on the amount of strain of the load receiving member,
- wherein the plurality of strain detecting elements form four resistance units, and a first circuit part in which two of the four resistance units are connected in series and a second circuit part in which the other two of the four resistance units are connected in series are connected in parallel to form a Wheatstone bridge circuit,
- the first circuit part is disposed between one of the pair of supporting portions and the load receiving portion,
- the second circuit part is disposed between the other of the pair of supporting portions and the load receiving portion,
- in a state where no load is applied to the load receiving member, the ratio of the resistance value of the positive-side resistance unit to the resistance value of the negative-side resistance unit in the first circuit part is set smaller than the ratio of the resistance value of the positive-side resistance unit to the resistance value of the negative-side resistance unit in the second circuit part, and
- in plan view of the load receiving member, the center point of the load receiving portion is offset from the center point of the arrangement of the plurality of strain detecting elements toward the second circuit part.
Dependencies are inferred from the claim text.