Patent ID: 6944308

Claim:
A capacitive transducer, comprising: a ring-shaped member defining an axis, the ring-shaped member having an outer annular wall and an inner annular wall rigidly connected to the outer annular wall, the inner annular wall having an opening; a diaphragm secured to the outer annular wall of the ring-shaped member and overlaying the opening, the diaphragm having an outer periphery and an electrically conductive portion, the diaphragm and the electrically conductive portion being movable in response to sound pressure; and a disc-shaped member secured in the opening of the inner annular wall and in parallel relationship to the diaphragm, the disc-shaped member having a first side with a first electrically conductive surface portion, and a second side opposite the first side, the second side having a second electrically conductive surface portion in electrical contact with the first electrically conductive surface portion, the first electrically conductive surface portion being spaced from the ring-shaped member and facing the diaphragm in a predetermined distance therefrom, whereby the diaphragm and the first electrically conductive surface portion form an electrical capacitor, wherein the second electrically conductive surface portion is directly accessible.