SMD type biased condenser microphone

Details SMD type biased condenser microphone SMD type biased condenser microphone

2007-09-11

2007-09-11

Kuntz, Curt (Department: 2614)

Electrical audio signal processing systems and devices

Electro-acoustic audio transducer

Microphone capsule only

C381S113000

Reexamination Certificate

active

10985609

ABSTRACT:
A surface mounted device (SMD) type biased condenser microphone includes two terminals for a surface mounting process. The SMD type biased condenser microphone includes a grounding terminal for connecting with an external circuit, a diaphragm/backplate set, one end of which is connected to the grounding terminal, for varying a capacity according to an intensity of sound pressure and converting sound into an electric signal, a DC-DC converter for providing a bias voltage so as to form an electrostatic field at one side of the diaphragm/backplate set, a buffer IC for amplifying the electric signal from the diaphragm/backplate set, and a decoupling capacitor for preventing the bias voltage output from the DC-DC converter from being directly applied to the buffer IC and transferring the electric signal from the diaphragm/backplate set to the buffer IC.

REFERENCES:
patent: 4491697 (1985-01-01), Tanaka et al.
patent: 6057737 (2000-05-01), Pritchard
patent: 7146016 (2006-12-01), Pedersen

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