Patent ID: 7941909
Filing Date: 2011-05-17
Classification: H04R,Y10T

Abstract:
1. A method of fabricating a condenser microphone, comprising the steps of: (a) forming a plurality of condenser microphones on a substrate, each of the condenser microphones including a first electrode film formed on the substrate, a dielectric film formed on the first electrode film and a second electrode film formed above the dielectric film, the substrate is formed under a periphery portion of the first electrode film and includes an opening under the dielectric film; (b) fixing charges to the dielectric film of each of the plurality of the condenser microphones formed in the step (a); (c) inspecting an amount of deposited charges of the dielectric film of each of the plurality of the condenser microphones by measuring capacitance of each condenser microphone while applying bias between the first electrode film thereof and the second electrode film thereof; and (d) dicing the substrate whereon the plurality of the condenser microphones is formed and separating each condenser microphone, wherein at least the step (b) is performed in a substrate state where the plurality of the condenser microphones is formed on the substrate,