Condenser microphone

A condenser microphone comprising:

• a case having a number of sound holes formed on an end thereof;
• a diaphragm received in the case and electrically connected to the case and capable of vibrating in accordance with sound pressure introduced through the sound holes;
• an electrode plate received in the case and disposed opposing the diaphragm with a spacer interposed therebetween;
• an insulating ring received in the case and positioned for insulating the electrode plate from the case;
• a printed circuit board embedded in the case on the opposite end from the end defining the sound holes and defining a chamber with the electrode plate, comprising:
• a signal line passing through the printed circuit board;
• a ground line aside the signal line passing through the printed circuit board;
• and
• a plurality of through holes defined on the printed circuit board and adjacent to the signal line and the ground line and the inner wall of each of the through holes being coated with a conductive material;
• and
• a conductive pattern received in the chamber and electrically connected with the electrode plate and the printed circuit board.

A printed circuit board embedded into a condenser microphone, comprising:

• a first via formed on the printed circuit board for a signal line passing therethrough;
• a second via aside to the first via formed on the printed circuit board for a ground line passing therethrough;
• and
• a plurality of through holes formed on the printed circuit board and surrounding the first via and the second via of the printed circuit board respectively, the inner wall of each of the through holes being coated with a conductive material.