Patent ID: 6997058
Filing Date: 2006-02-14
Classification: G01L

Abstract:
1. A pressure sensor comprising: a metal stem having a diaphragm which is deformable in accordance with an applied pressure; a semiconductor substrate attached to a surface of the diaphragm, wherein the semiconductor substrate is a laminated structure in which an insulation layer is inserted between first and second semiconductor layers; and a plurality of strain gauges, formed on a predetermined area of the first semiconductor layer of the semiconductor substrate, for converting a bending of the diaphragm to an electrical signal, wherein: the strain gauges have pattern shapes insulated and separated from each other by trenches each of which extends from a surface of the first semiconductor layer to the insulation layer; the semiconductor substrate has a recess portion, which is recessed from a surface of the second semiconductor layer to the insulation layer and is provided at a position corresponding to the predetermined area; and the diaphragm is inserted into the recess portion, and the insulation layer is attached to a surface of the diaphragm in the recess portion.