Patent ID: 7191659

Claim:
A pressure sensor having a pressure detecting chamber sectionally formed by a diaphragm for receiving measured pressure and a case, wherein a semiconductor chip having a pressure-sensitive portion is disposed in the pressure detecting chamber, wherein electrically insulating pressure transmitting liquid for transmitting the measured pressure received by the diaphragm to the semiconductor chip is sealingly filled in the pressure detecting chamber, wherein an electrical circuit for signal processing is disposed around the pressure-sensitive portion at the surface site of the semiconductor chip, wherein the electrical circuit is coated by a protection film, the pressure sensor comprising: electrical conducting film set to ground potential formed as the uppermost layer of the semiconductor chip on the surface of the protection film coating the electrical circuit, wherein the electrical conducting film is included on the semiconductor chip in areas other than where the pressure-sensitive portion is included, and wherein the electrical conducting film removes charges resulting from electrification when the electrically insulating pressure transmitting liquid is polarized by static electricity.