Patent ID: 8422702
Filing Date: 2013-04-16
Classification: H04R

Abstract:
1. A condenser microphone, comprising: a first insulating layer formed on a lower silicon layer; a back plate formed on the first insulating layer and having a plurality of sound holes passing through the back plate; a second insulating layer formed on an edge of the back plate such that the sound holes are not plugged; and a flexure hinge-shaped diaphragm vibrating due to an external sound pressure, the diaphragm including a contact region in contact with the second insulating layer, a vibration region upwardly projecting from the contact region and forming an air gap with the back plate, and a plurality of air holes passing through the vibration region, wherein each of the plurality of air holes has a shape of a slot, each slot, taken from a plan view, extends in an angular direction about a center of the vibration region, and all slots formed by the air holes are concentric to one another.