Patent ID: 8526664

Claim:
A capacitor microphone unit comprising: a diaphragm; a fixed electrode that is arranged opposite to the diaphragm with a space provided between the diaphragm and the fixed electrode so that a capacitor is formed between the diaphragm and the fixed electrode; an insulating base that is disposed on a rear side of the fixed electrode and supports the fixed electrode on a front side of said insulating base; a ring-shaped acoustic resistance material that is disposed on said front side of the insulating base; and a second acoustic resistance material positioned on said front side of said insulating base between said ring-shaped acoustic resistance material and said insulating base, wherein all of the diaphragm, the fixed electrode, the insulating base, the acoustic resistance material and the second acoustic resistance material are incorporated in a unit casing, and a skin layer is formed on at least one of a front side and a rear side of the acoustic resistance material, and the skin layer has a higher density than that inside the acoustic resistance material.