Patent ID: 6441451
Filing Date: 2002-08-27
Classification: H04R

Abstract:
A pressure transducer comprising:a substrate having a first surface and a second surface opposed to the first surface; a fixed electrode formed in the first surface of said substrate; a diaphragm attached at a peripheral portion thereof to the first surface of said substrate and extending above said first surface so as to form a cavity between a central portion thereof and said fixed electrode above said first surface, said diaphragm having a moving electrode opposed to said fixed electrode through the cavity and being deformed in response to an applied pressure to change a distance between the moving electrode and said fixed electrode as a function of the applied pressure; a hole formed in said substrate which extends from the second surface to the cavity; and at least one radial groove which is formed in the first surface of said substrate within the cavity and which communicates at a first end thereof with said hole.