Patent ID: 9631992
Date: 2017-04-25
CPC Classifications: G01L

Claim:
1. A physical quantity sensor comprising: a plurality of diaphragm portions configured to bend and deform due to pressure changes; and four piezoresistive elements disposed in each of the diaphragm portions, the four piezoresistive elements being located at different locations from each other, wherein a first piezoresistive element in a first of the diaphragm portions is electrically connected with a corresponding first piezoresistive element in a second of the diaphragm portions in series between a first pair of electrodes, and a resistance value of both first piezoresistive elements decreases when the first of the diaphragm portions and the second of the diaphragm portions are deformed, wherein a second piezoresistive element in the first of the diaphragm portions is electrically connected with a corresponding second piezoresistive element in the second of the diaphragm portions in series between a second pair of electrodes, and a resistance value of both second piezoresistive elements decreases when the first of the diaphragm portions and the second of the diaphragm portions are deformed, wherein a third piezoresistive element in the first of the diaphragm portions is electrically connected with a corresponding third piezoresistive element in the second of the diaphragm portions in series between a third pair of electrodes, and a resistance value of both third piezoresistive elements increases when the first of the diaphragm portions and the second of the diaphragm portions are deformed, and wherein a fourth piezoresistive element in the first of the diaphragm portions is electrically connected with a corresponding fourth piezoresistive element in the second of the diaphragm portions in series between a fourth pair of electrodes, and a resistance value of both fourth piezoresistive elements increases when the first of the diaphragm portions and the second of the diaphragm portions are deformed.