Patent ID: 6308575
Filing Date: 2001-10-30
Classification: G01L

Abstract:
A method for manufacturing piezo-resistive micro pressure sensors, comprising the steps of:(a) providing a bulk silicon wafer having an upper face;(b) forming a plurality of piezo-resistors on the upper face of said bulk silicon wafer(c) forming circuit pattern on the upper face of said bulk silicon wafer to connect said plurality of piezo-resistors and providing a plurality of contact pads:(d) defining a cutoff in an upper side portion of said bulk silicon wafer:(e) providing a glass substrate having an upper face defined therein a shallow cavity:(f) forming a plurality of contact pads on the upper face of said glass substrate;(g) bonding said bulk silicon wafer to said glass substrate in such a manner that the upper face of said bulk silicon wafer is attached to the upper face of said glass substrate and the plurality of contact pads on said bulk silicon wafer securely attach to the plurality of contact pads on said glass substrate;(h) etching to reduce said bulk silicon wafer down to a thin membrane; and(i) etching said bulk silicon wafer to expose the contact pads on said glass substrate.