Patent ID: 7497125

Claim:
A pressure sensor comprising: a diaphragm which is deformable in response to a pressure applied on a front surface of the diaphragm; a pressure transmitting member which receives the pressure from the diaphragm in response to a deformation of the diaphragm; and a sensing element which detects the pressure transmitted from the pressure transmitting member,wherein the diaphragm has a first layer with the front surface and a second layer, the pressure transmitting member receives the pressure from the second layer of the diaphragm in response to the deformation of the diaphragm, and a thermal expansion coefficient of the second layer is larger than a thermal expansion coefficient of the first layer, and wherein the diaphragm has a shape so as to shift the second layer of the diaphragm toward a side opposite to the pressure transmitting member in response to a heat applied to the diaphragm.