Patent ID: 8418557
Filing Date: 2013-04-16
Classification: B81B,G01P

Abstract:
1. A physical quantity sensor comprising: a support substrate; an anchor portion fixed to a top surface of the support substrate; a movable portion positioned above the support substrate and supported by the anchor portion with a plurality of support portions provided therebetween such that the movable portion is movable in a height direction; and a detection portion for detecting a displacement of the movable portion, wherein each support portion includes a beam portion provided between the movable portion and the anchor portion such that a spring portion is provided between the beam portion and each of the movable portion and the anchor portion, the beam portion having a rigidity higher than a rigidity of the spring portion, wherein the movable portion translates in the height direction owing to twisting of the spring portion and a displacement in the height direction of a distal end of the beam portion, the movable portion being supported at the distal end, wherein the support portions are provided so as to extend from the anchor portion and the beam portions of the respective support portions are connected to each other with a connection spring at proximal ends of the beam portions opposite to the distal ends, the connection spring having a high flexural rigidity in the height direction, and wherein the anchor portion is positioned inside an area defined by the outermost periphery of the movable portion, and the beam portion is positioned outside the outermost periphery of the movable portion, the beam portion being connected to the anchor portion with the spring portion provided between the beam portion and the anchor portion.