Patent ID: 9733140
Date: 2017-08-15
CPC Classifications: G01L

Claim:
1. A double diaphragm pressure sensor comprising: a metal container having a concave portion with an opening portion; a pressure sensor unit mounted on a bottom of the container; a metal diaphragm airtightly bonded to the opening portion of the concave portion of the container; a pressure transmission medium filling a space formed by the metal diaphragm and the concave portion of the container; and a metal terminal penetrating the bottom of the container and being electrically insulated from the container, wherein the metal diaphragm is formed from a lamination of an outer side diaphragm part having a high thermal expansion coefficient and an inner side diaphragm part having a low thermal expansion coefficient than that of the outer side diaphragm so that change of internal pressure caused by volume expansion/contraction of the pressure transmission medium according to temperature is absorbed by thermal deformation of the metal diaphragm.