Patent ID: 7183620
Filing Date: 2007-02-27
Classification: G01L

Abstract:
1. A differential pressure sensor apparatus, comprising: a semiconductor wafer having a top surface and a bottom surface, said top surface having a central active area containing a plurality of piezoresistive elements, a plurality of contact terminals, each of said contact terminals associated with and connected to a piezoresistive element, a solid insulating layer covering said active area and said piezoresistive elements, a peripheral semiconductor frame surrounding said active area, and an insulating inner frame layer also surrounding said active area; and a glass cover member having a central aperture for communicating with said active area, said glass cover member electrostatically bonded to said wafer at said peripheral semiconductor frame, with said inner frame forming a compression bond with said glass wafer, said glass wafer having contact through holes each associated and communicating with an associated contact terminal when said cover member is bonded to said wafer.