Patent ID: 6066882
Filing Date: 2000-05-23
Classification: G01L,Y10S

Abstract:
A semiconductor pressure detecting device comprising:a semiconductor sensor element capable of detecting a strain and/or stress that occurs on a thin-walled pressure receiving portion;a pedestal seat for joining and supporting the semiconductor sensor element;a base member for joining and supporting the pedestal seat; anda cap member welded and joined to the base member so as to cover the base member, the pedestal seat and the semiconductor sensor element,wherein a fluid pressure that acts on a pressure chamber formed between an inner wall of the semiconductor sensor element including the pressure receiving portion and a sensor element supporting surface of the pedestal seat is detected by the semiconductor sensor element,the base member has a body portion of a specified thickness and a thin-walled flange portion formed integrally with an outer circumferential portion of the body portion and forming an L-shaped cross-section therewith,a flange portion is provided at an opening end of the cap member and is welded and joined to the flange portion of the base member, anda thickness of the flange portion of the base member is substantially equal to or less than a thickness of the flange portion of the cap member.