Patent ID: 6678383
Filing Date: 2004-01-13
Classification: H04R,Y10T

Abstract:
A capacitor microphone comprising:a case having an end wall defining an opening for a sound hole; a capacitor portion comprising a diaphragm, a back plate and a spacer, the diaphragm opposing to the back plate via the spacer, the capacitor portion being accommodated in the case in such a manner as the diaphragm is placed on the side of the end wall; and a substrate accommodated in the case farther from the end wall than the capacitor portion, the substrate having an impedance conversion element mounted on a surface thereof facing the capacitor portion, wherein a communicating opening is provided around the back plate in a position opposing to the impedance conversion element for communicating spaces on the front and back sides of the back plate; and the communicating opening has a larger area than that of the top of the impedance conversion element; and wherein the top of the impedance conversion element is inserted into the communicating opening.