Patent ID: 6694032
Filing Date: 2004-02-17
Classification: H04R,Y10T

Abstract:
An electret condenser microphone comprising:a case 50 having an opening formed at a upper side thereof and a plurality of sound holes 52 formed at a central portion of a underside thereof, the sound holes 52 serving to collect and pass sound there-through; a vibratory diaphragm 70 disposed above an inner bottom surface 50a of the case 50 and spaced from the inner bottom surface 50a of the case 50 at a given distance (&Dgr;t), the vibratory diaphragm 70 being vibrated by sound pressure coming in through the sound holes 52 of the case 50 so as to transform a sound signal into a voltage signal; a vibratory diaphragm support member 80 formed of a semiconductor wafer and disposed on the vibratory diaphragm 70, the vibratory diaphragm support member 80 serving to transmit the voltage signal from the vibratory diaphragm 70 and having a concave groove 84 formed at a underside thereof and a concave portion 82 at a upper side thereof, the concave groove 84 being formed such that the vibratory diaphragm support member 80 is spaced apart from at a given distance, the concave portion 82 having a plurality of sound holes 82a which are formed at a bottom surface thereof such that the vibratory diaphragm 70 is vibrated easily; an integrated circuit 100 attached to the vibratory diaphragm support member 80 and serving to transform the voltage signal into an electrical signal and amplify the transformed electrical signal; an insulating cap 110 covering the opening formed on the case 50 while electrically insulating the vibratory diaphragm support member 80 from the case 50; and, a pair of contact pins 120 and 130 disposed on the insulating cap 110 and serving to transmit amplified electrical signal from the integrated circuit 100 to an outside of the electret condenser microphone.