Patent ID: 8094844

Claim:
A micro acoustic transducer, comprising: a substrate with at least one first cavity and one second cavity which is above the first cavity, wherein the first cavity and the second cavity are communicated with each other; a backplate formed on the substrate, wherein the backplate has a plurality of acoustic holes; a diaphragm formed on the backplate, wherein a plurality of rings is formed around the diaphragm; and a plurality of pillars formed on the substrate, wherein the position of each of the pillars corresponds to that of each of the rings, respectively; wherein an air gap is formed between the diaphragm and the backplate, the air gap, the second cavity, and the first cavity are communicated with each other through each of the acoustic holes; each of the rings hitches the corresponding pillar, respectively; and the diameter of the hole of each ring is larger than that of each pillar.