Patent ID: 6400009
Filing Date: 2002-06-04
Classification: B81B,B81C,H01L

Abstract:
A packing having a cavity with a height for having a micro-electromechanical systems (MEMS) device and sealing the MEMS device in the cavity to protect the MEMS device against deleterious conditions present in an environment of the package, comprising:a first substrate for defining a base on which the MEMS device is fabricated; a firewall fabricated on the first substrate and having a bottom surface engaged with the first substrate, said firewall forming walls of the cavity which extend upwardly away from the bottom surface for fully surrounding the MEMS device within the cavity which is bounded and formed by the firewall and the first substrate, said firewall comprising alternating stacks of poly-silicon and silicon dioxide encapsulated by poly-silicon; and a second substrate bonded to the first substrate over the firewall and in sealed engagement with the firewall for creating a cavity-closing seat for the cavity within which the MEMS device is fully enclosed against the deleterious conditions present in the environment of the package so that the MEMS device is packaged protectedly within the cavity and remote from the deleterious conditions.