Patent ID: 8861753

Claim:
An acoustic transducer comprising: a substrate; a vibrating membrane, formed above the substrate, which includes a vibrating electrode; and a fixed membrane, formed on an upper surface of the substrate, which includes a fixed electrode, said acoustic transducer converting an acoustic wave into an electrical signal according to a change in capacitance between the vibrating electrode and the fixed electrode, wherein the fixed membrane having a plurality of sound holes formed therein in order to allow the acoustic wave to reach the vibrating membrane from outside, wherein the sound holes are arranged such that a distance between the centers of the sound holes adjacent to each other is shorter than a sum of diameters of the sound holes adjacent to each other, wherein the fixed electrode being formed so that, when seen from an angle of a line normal to the surface of the substrate, a boundary of an edge portion of the fixed electrode does not intersect the sound holes, and wherein the sound holes are arranged such that the sound holes are both inside and outside of the boundary of the edge portion.