Patent ID: 8948419
Filing Date: 2015-02-03
Classification: H04R

Abstract:
1. A MEMS microphone comprising: a backplate having a backplate interior surface; a diaphragm having a plurality of through-holes, the diaphragm spaced from the backplate and facing the backplate interior surface, the diaphragm being movably coupled with the backplate to form a variable capacitor, the backplate having a plurality of through-holes, substantially all of the through-holes each having an inner dimensional shape on the backplate interior surface, each inner dimensional shape having a plurality of convex portions and a plurality of concave portions, each inner dimensional shape also having at least a curved portion, wherein the inner dimensional shape has a hub and a plurality of lobes extending from the hub; and a plurality of springs suspending the diaphragm above the backplate, the plurality of springs forming a pattern of openings along the periphery of the diaphragm, wherein the plurality of diaphragm through-holes have long meandering perimeters, further wherein the inner dimensional shape is generally cross-shaped to generally form a clover shape.