Patent ID: 8314444

Claim:
A piezoresistive pressure sensor comprising a diaphragm disposed on a silicon substrate, and a plurality of piezo elements of which resistance values are changed according to deformation of the diaphragm, wherein each of the piezo elements is so configured that at least three semiconductor resistive layers are arranged in parallel at predetermined intervals on a surface of the diaphragm, and the respective semiconductor resistive layers arranged in parallel are electrically connected in series by semiconductor interconnection layers having a lower resistance than that of the semiconductor resistive layers, and the semiconductor resistive layers on both sides of the arrangement are electrically connected to semiconductor connection layers having a lower resistance than that of the semiconductor resistive layers, respectively, and wherein in the case where a ratio of sheet resistance of the semiconductor interconnection layers to sheet resistance of the semiconductor resistive layers is about 0.06 to about 0.28, the shortest distance between the semiconductor interconnection layer and the semiconductor connection layer is about 5 μm to about 20 μm.