Patent ID: 9736590
Date: 2017-08-15
CPC Classifications: H04R

Claim:
1. A microfabricated structure comprising: a cavity disposed in a substrate; a first clamping layer overlying the substrate; a deflectable membrane overlying the first clamping layer; a second clamping layer overlying the deflectable membrane, wherein a portion of the second clamping layer overlaps the cavity; and a sensing layer overlying the second clamping layer and comprising outermost perforations in a peripheral portion of the sensing layer that are evenly spaced along a first perimeter, the first perimeter surrounding a central portion of the sensing layer, wherein the central portion of the sensing layer is disposed directly over the cavity and comprises additional perforations, wherein the additional perforations in the central portion of the sensing layer are larger than the outermost perforations in the peripheral portion of the sensing layer.