Patent ID: 7484422

Claim:
A mechanical-quantity measuring device having a Wheatstone bridge circuit formed of p-type impurity-diffused layers, and a slit or slits provided on a single side or both sides of said Wheatstone bridge circuit in the direction perpendicular to the strain-measuring direction or a region or regions of a lower elasticity than that of said semiconductor substrate on said single side or both sides of said Wheatstone bridge circuit in the direction perpendicular to the strain measuring direction, said Wheatstone bridge circuit being formed of a combination of p-type impurity-diffused layers built so that the direction in which the resistance change of said p-type impurity-diffused layers due to the current flow in said layers is measured can be made in parallel to the <110> direction of said semiconductor single crystalline substrate, and p-type impurity-diffused layers built so as to measure their resistance change due to the current caused to flow in the direction rotated 90° on said single crystalline substrate from the direction of said current flow in said first-mentioned impurity-diffused layers.