Patent ID: 6877383

Claim:
A semiconductor pressure sensor comprising a diaphragm which is deformed in correspondence with a pressure of fluid to be measured, wherein said diaphragm is made of an electrically conductive polycrystalline silicon film formed by using a process for etching a sacrifice layer on one surface of a silicon substrate, a pressure receiving surface of said diaphragm which is contacted to said fluid is covered with an insulation film, and said pressure receiving surface covered with said insulation film is further covered with an electrically conductive film for electromagnetic shielding which is made of an electrically conductive polycrystalline silicon film and is in a grounded state said insulation film and said electrically conductive film for said electromagnetic shielding are formed on a surface of said silicon substrate where said diaphragm is not formed, a lead for grounding is formed so as to be covered with said insulation film and said electrically conductive film for said electromagnetic shielding, and said electrically conductive film for said electromagnetic shielding is connected to said lead for grounding through a hole provided on said insulation film.