Patent ID: 8126167
Filing Date: 2012-02-28
Classification: H04R

Abstract:
1. A condenser microphone comprising: a diaphragm having a conductivity, which includes a center portion and a plurality of arms extended externally in a radial manner and which vibrates due to sound waves; a back plate having a conductivity, which is positioned opposite to the diaphragm; a substrate having a cavity that is positioned opposite to the back plate so as to face the diaphragm; a first support for supporting the diaphragm above the substrate while insulating tip ends of the arms of the diaphragm from the substrate, thus forming a passage between the substrate and the diaphragm; and a second support, which is positioned between the arms of the diaphragm so as to support the back plate above the substrate while insulating an external periphery of the back plate from the substrate, thus forming a gap between the center portion of the diaphragm and the back plate, wherein the distance from the center of the back plate to an outer end thereof is shorter than the distance from the center of the center portion of the diaphragm to the distal end of the arm.