Is a
Patent attributes
Patent Jurisdiction
Patent Number
Date of Patent
November 6, 2007
Patent Application Number
10503653
Date Filed
January 30, 2003
Patent Primary Examiner
Patent abstract
The present invention is an electret condenser microphone that includes an electro-acoustic transducer (M) having an electret portion (E) including a diaphragm (6) acting as an electrode and a stationary electrode (2, 25) disposed in opposition to the diaphragm (6), and a FET (10) effecting an impedance conversion on an output from the electro-acoustic transducer (M) and then outputting the converted output on a signal line (L). A capacitor (11) and a varistor (12) are provided in parallel between the signal line (L) and a ground (18) and a resistor (13) is incorporated in series in the signal line (L).
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