Patent ID: 7213463
Filing Date: 2007-05-08
Classification: G01L

Abstract:
1. A pressure sensor comprising; a case having a pressure sensing chamber; a liquid confined in the pressure sensing chamber; a pressure receiving metal diaphragm that has contact with the liquid and seals the pressure sensing chamber; and a pressure sensing element to which a connecting member for electrical connection is attached, and arranged in the pressure sensing chamber in a position that pressure from the liquid is receivable; an O-ring arranged around an edge of the pressure receiving diaphragm and the pressure sensing chamber between the pressure receiving diaphragm and the case; and a welding ring arranged around the edge of the pressure receiving diaphragm and the pressure sensing chamber between the pressure receiving diaphragm and the case more adjacent to the pressure receiving diaphragm than the O-ring, wherein the pressure receiving diaphragm is fixed to the case via the O-ring and the welding ring, and the welding ring has a hole formed such that an inner portion of the welding ring is placed between the pressure receiving diaphragm and at least one of the pressure sensing element and the connecting member in a longitudinal direction in the pressure sensing chamber.