Patent ID: 8012360
Filing Date: 2011-09-06
Classification: G01L,Y10T

Abstract:
1. A method for producing a pressure sensor comprising the steps of: (a) creating a via through a ceramic substrate, said via extending from a first aperture, defining a perimeter, on a top surface of said ceramic substrate to a second aperture on a bottom surface of said ceramic substrate; (b) depositing a sacrificial layer on a portion of said top surface said ceramic substrate wherein said sacrificial layer covers said first aperture of said via; (c) screen printing a diaphragm having an upper surface and side walls on said ceramic substrate wherein said diaphragm covers said sacrificial layer; (d) depositing an upper sensor element on at least a portion of said upper surface of said diaphragm and extending to at least a portion of a second region of said top surface of said substrate; (e) depositing a termination electrode on said second region of said substrate; (f) introducing an etchant into said second aperture of said via; and (g) etching said sacrificial layer with said etchant to release said upper surface of said diaphragm to allow said upper surface of said diaphragm to flex in response to an applied pressure differential across a portion of said diaphragm.