Differential condenser microphone with double layer vibrating membrane

摘要

The back plate, the first vibrating membrane which is insulatedly supported by the first surface of the back plate and constitutes the first variable capacitance together with the back plate, and the second surface of the back plate which is insulated and supported together with the back plate. A differential condenser microphone having a two-layer vibrating membrane including a second vibrating membrane constituting two variable capacitances, the back plate having at least one connection hole, and the second vibrating membrane being a back plate. It is characterized in that it has a recess recessed in the direction of the above, and the recess is insulatedly connected to the first vibrating membrane through the connection hole. The differential condenser microphone having the two-layer vibrating membrane has a higher signal-to-noise ratio.