Patent ID: 7739922

Claim:
A triaxial force sensor comprising: a protruding load action element provided on a center of one surface of a strain causing plate part; and a plurality of strain sensitive elements arranged on the other surface of the strain causing plate part for detecting strains in an X-axial direction, a Y-axial direction, each of the plurality of strain sensitive elements in the X-direction and in the Y-direction being formed by a grid pattern of reciprocating straight lines, and a Z-axial direction caused by a force acting on the load action element, wherein the same number of strain sensitive elements are arranged at one side and the other side in the X-axial direction relative to the center of the strain causing plate part, and the same number of the strain sensitive elements are arranged at one side and the other side in the Y-axial direction relative to the center of the strain causing plate part; thus an X-axial bridge circuit for detecting a component of force in the X-axial direction is formed with the strain sensitive elements arranged at the one side and the other side in the X-axial direction; and a Y-axial bridge circuit for detecting a component of force in the Y-axial direction is formed with the strain sensitive elements arranged at the one side and the other side in the Y-axial direction; and an entirety of the X-axial bridge circuit and an entirety of the Y-axial circuit being connected by a pair of opposite sides, respectively; and a Z-axial bridge circuit for detecting a component of force in the Z-axial direction by an output signal obtained in accordance with a change in a combined resistance value of the X-axial bridge circuit and a change in the combined resistance value of the Y-axial bridge circuit.