Patent ID: 7620191
Filing Date: 2009-11-17
Classification: H04R

Abstract:
1. A condenser microphone comprising: a microphone unit; and a housing shaped to enclose the microphone unit to mechanically protect the microphone unit, the housing having a front end wall, the microphone unit comprising: an annular retainer having a front face oriented to face against the front end wall of the housing and a rear face; a movable diaphragm having a front face, a rear face and a peripheral edge attached to the rear face of the annular retainer, the movable diaphragm being placed in confronting relation to the front end wall of the housing and vibrated in response to an incident sound pressure wave through the front end wall of the housing; an annular spacer having a front face attached to the rear face of the movable diaphragm at the peripheral edge of the movable diaphragm and a rear face; a substrate connected to the rear face of the annular spacer, the substrate including a back electrode having an electric disposed on the back electrode and oriented in confronting relation to the movable diaphragm, the back electrode being operatively associated with the movable diaphragm to constitute a condenser, the condenser having a variable electrical capacitance; and a printed circuit board connected to the substrate and including an electronic component for generating an electric signal in response to the variable electrical capacitance, the microphone unit being mounted in the housing and further comprising an electrically joining member made from an electrically conductive adhesive that sealingly connecting the front face of the annular retainer to the front end wall of the housing.