Patent ID: 6975736

Claim:
A microphone comprising: a diaphragm having a first face and a second face; a back plate that opposes the second face of the diaphragm spaced apart from the second face of the diaphragm with a fixed gap in between; a support for holding the diaphragm and the back plate; a mechanoelectric transducer coupled with the back plate; and a case for housing the diaphragm, the back plate, the support and the mechanoelectric transducer, wherein the diaphragm divides interior space of the case into a first space that is in contact with the first face and a second space that is in contact with the second face; and wherein the back plate is housed in the second space inside the case and the case has a through hole on the part that is in contact with the second space, said case sealed on a side of said case where said first space is located.