Back plate structure of directional electret condenser microphone

摘要

The present invention relates to a directional electret condenser microphone in which micropores are formed in the back electrode to have a phase delay function so that the directivity can be obtained. In the condenser microphone having the back electrode, the forward directivity can be obtained. It is characterized in that to form a micro-pores in the back electrode to delay the phase of the rear incident sound through the rear incident sound. According to the present invention configured as described above, the micropores for delaying the phase of the rear incident sound can be formed in the rear electrode to obtain directivity characteristics in the omnidirectional condenser microphone without a separate phase delay. In addition, since a separate phase delay element is not inserted, the number of parts of the condenser microphone can be reduced and the production process can be simplified.;Directional Condenser Microphone, Phase Delay, Back Electrode, Micropores