Patent ID: 8661911
Filing Date: 2014-03-04
Classification: G01L

Abstract:
1. A piezo-resistive pressure sensor comprising: a planar diaphragm which has a peripheral edge; a support section which supports the diaphragm from surrounding; and first, second, third and fourth piezo-resistance sections which each comprise a plurality of piezo-resistance elements arranged in parallel and which are formed on the diaphragm near the peripheral edge of the diaphragm and near the support section, the first and second piezo-resistance sections being arranged opposite to each other in a first direction on a plane of the diaphragm, the third and fourth piezo-resistance sections being arranged opposite to each other in a second direction on the plane of the diaphragm, the second direction being perpendicular to the first direction, wherein the first, second, third and fourth piezo-resistance sections are the same as each other in area and in outer shape, wherein the first, second, third and fourth piezo-resistance sections comprise respective facing portions which face the support section, and the facing portions of the first, second, third and fourth piezo-resistance sections are the same as each other in size.