Patent ID: 6883379

Claim:
An absolute-pressure type of pressure sensor, in which a pressure detecting device having a metal diaphragm with two surfaces is placed, one of the two surfaces being formed to sustain a strain gauge placed thereon and the other surface being formed to contact fluid to be introduced for measurement, the pressure sensor comprising: a lid made of metal and disposed for providing a reference pressure space facing the strain gauge on the metal diaphragm; a relay board electrically connected to the strain gauge and composed of laminated ceramic members having both of through holes formed to pass through both sides of the relay board and a protrusion formed outwardly; two seal rings located to face the two sides of the relay board, respectively, one seal ring having two circumferential ends air-tightly connected with the one side of the relay board and a circumferential end of the diaphragm, the other seal ring having two circumferential ends air-tightly connected with the other side of the relay board and a circumferential end of the lid so that the reference pressure space is formed; and an input/output terminal electrically connected to the relay board and mounted on the protrusion of the relay board so that the input/output terminal extends outwardly.