Patent ID: 6252759
Filing Date: 2001-06-26
Classification: G01L

Abstract:
A captive pressure sensor comprising:a substance made of ceramic material, the substrate having a first surface,a first metallic electrode disposed on the first surface,a glass layer formed from a original glass frit disposed on the first metallic electrode,a space formed from the original glass frit,a diaphragm made of ceramic material permanently joined and pressure-sealed to the substrate by means of the glass layer and spacer holding the diaphragm and the substrate at a defined distance form each other to form a cavity, the diaphragm including a cavity side facing toward the cavity,a second metallic electrode disposed on the cavity side of the diaphragm; anda thin insulating layer made of at least one of the ceramic material of the substrate and a high-temperature glass disposed on the glass layer covering the first electrode, wherein the diaphragm is permanently joined to the insulating layer by the spacer.