Patent ID: 7898081

Claim:
A MEMS device, comprising: a substrate; a MEMS structure disposed on the substrate, the MEMS structure comprises: at least an electrode disposed within or on the substrate, and a micro-machined metal mesh disposed over the substrate such that a first chamber is formed between the micro-machined metal mesh and the substrate; and a vent hole structure disposed on a same side of the substrate on which the MEMS structure is disposed, the vent hole structure adjoining the MEMS structure with a first etch stop structure therebetween, wherein the first etch stop structure comprises a plurality of metal layers and a plurality of trench-shaped vias alternately stacking each other, and the vent hole structure comprises: a metal layer disposed over the substrate, a second chamber formed between the metal layer and the substrate and communicating with the first chamber through beneath the first etch stop structure, and a plurality of vent holes throughout the metal layer to communicate with the second chamber.