Patent ID: 8685778
Filing Date: 2014-04-01
Classification: B81B,B81C,H01H,H01L,Y10S,Y10T

Abstract:
1. A method of forming at least one Micro-Electro-Mechanical System (MEMS), comprising: forming a first sacrificial cavity layer; forming a layer over the first sacrificial layer; forming a second sacrificial cavity layer over the first sacrificial layer and in contact with the layer; forming a lid on the second sacrificial cavity layer; forming at least one vent hole in the lid, exposing a portion of the second sacrificial cavity layer; and venting or stripping the second sacrificial cavity layer such that a top surface of the second sacrificial cavity layer is no longer touching a bottom surface of the lid, before venting or stripping the first sacrificial cavity layer thereby forming a first cavity and second cavity, respectively, and the first sacrificial cavity layer being etched at a slower rate than the second sacrificial cavity layer.