Patent ID: 6931937
Filing Date: 2005-08-23
Classification: G01L

Abstract:
1. A pressure sensor comprising: a casing having an inner through hole with an opening; a sensor chip with a gauge resistor disposed on a surface of the sensor chip; a boss disposed on the gauge resistor; a metallic diaphragm capable of distorting in accordance with a pressure; and a load transmission member disposed between the metallic diaphragm and the boss and being movable in accordance with a distortion of the metallic diaphragm so that a load corresponding to the pressure applied to the metallic diaphragm is transmitted to the boss through the load transmission member, wherein the casing accommodates the sensor chip, the boss and the load transmission member inside the inner through hole of the casing, the opening of the casing is covered with the metallic diaphragm, the pressure applied to the diaphragm is detected in such a manner that the load corresponding to the pressure is applied to the gauge resistor through the metallic diaphragm, the load transmission member and the boss so that a resistance of the gauge resistor is changed, and that the pressure is measured on the basis of a resistance change of the gauge resistor, and the gauge resistor is larger than the boss, seeing from a load transmission member side, so that the boss is covered with the gauge resistor.