Patent ID: 7658118
Filing Date: 2010-02-09
Classification: G01L

Abstract:
1. A strain detector comprising: a substrate having a mounting area; a first fixed member fixed to the mounting area of the substrate on a first surface of the substrate, the first fixed member having a first longitudinal axis located at a center of the mounting area; a second fixed member fixed to a second surface of the substrate, the second surface of the substrate being opposed to the first surface, the second fixed member having a second longitudinal axis coaxial with the first longitudinal axis; a bridge circuit provided on the substrate and including at least two strain resistance elements, the strain resistance elements being disposed outside of the mounting area in a radial direction relative to the first longitudinal axis; and a circuit portion provided on the substrate, the circuit portion being electrically connected to the strain resistance elements, wherein the second fixed member is fixed to the second surface of the substrate at a region disposed outside of the strain resistance elements in a radial direction relative to the first longitudinal axis, wherein at least one of the first fixed member and the second fixed member is fixed to the substrate by one of welding and adhesion, wherein the second fixed member is fixed to the substrate by one of welding and adhesion, and wherein a periphery of the substrate in a region where the second fixed member is fixed is flush with a periphery of the second fixed member such that the periphery of the substrate and the periphery of the second fixed member form a flat edge for welding or adhesion.