Patent ID: 6584854
Filing Date: 2003-07-01
Classification: A61B,G01L

Abstract:
A pressure sensor comprising:a semiconductor substrate having a pressure introduction passage therethrough; a thin-film diaphragm covering the semiconductor substrate with a predetermined distance therefrom forming a pressure directing path and a pressure detecting chamber therebetween, the thin-film diaphragm covering the pressure detecting chamber being distorted in response to pressure transmitted into the pressure detecting chamber through the pressure introduction passage via the pressure directing path to enable the pressure sensor to detect a pressure based upon a change of the predetermined distance between the semiconductor substrate and the thin-film diaphragm covering the pressure detecting chamber; and a buffer concavity formed in the semiconductor substrate at the pressure directing path, wherein pressure transmitted into the pressure detecting chamber through the pressure introduction passage is buffered in the buffer concavity so that distortion of the thin-film diaphragm covering the pressure detecting chamber due to an instantaneous pressure is prevented.