Patent ID: 6030851
Filing Date: 2000-02-29
Classification: G01L

Abstract:
A method for fabricating a mechanical overpressure stop on a pressure sensor having a silicon substrate and a sensing diaphragm comprising the steps ofdepositing a layer of sacrificial material to form a spacer on said silicon substrate adjacent to said sensing diaphragm,depositing a metalization layer on said silicon substrate and said spacer,depositing a layer of dry film resist upon said metalization layer, wherein said dry resist layer is deposited in successive layers each less than approximately twenty-five micrometers thick, each layer being patterned in registry with a previously deposited resist layer before deposit of a subsequent layer,removing a portion of said resist layer at locations adjacent to said spacer to partially expose said metalization layer,depositing a metal layer upon exposed positions of said metalization layer to form said mechanical overpressure stop, andremoving the remainder of said resist layer and said spacer.