Patent ID: 6578426
Filing Date: 2003-06-17
Classification: G01L

Abstract:
A pressure sensor comprising:a metallic stem having a diaphragm for sensing a pressure applied thereto, the metallic stem being contained in a housing; a semiconductor sensor chip mounted on a front surface of the diaphragm with an insulation layer interposed therebetween; a strain gage for converting distortion of the diaphragm caused by the pressure applied thereto into an electrical signal, the strain gage being formed on the semiconductor sensor chip; and a grounded shield layer for electrically interrupting the strain gage from the metallic stem that is interposed between the strain gage and insulation layer, wherein: the semiconductor sensor chip comprises a silicon semiconductor chip having a first-type conduction layer contacting the insulation layer and a second-type conduction layer formed on the first-type conduction layer; the first-type conduction layer functions as the grounded shield layer; and the strain gage is formed by a first-type conduction region formed in the second-type conduction layer and separated from the first-type conduction layer.