Patent ID: 8194908

Claim:
A side-entry condenser microphone, comprising: a metallic head case portion having a metallic guard net, and a metallic base ring situated at one side of the metallic guard net and having a step portion and an opening, a microphone unit disposed in an internal space of the head case portion to pick up sound through the metallic guard net, a support member attached to the microphone unit to dispose the microphone unit in the internal space along a longitudinal direction of the head case, a metallic body portion attached under the support member, for supporting the head case portion at an upper end thereof, and a circuit board having an audio output circuit with an impedance converter on one side, said circuit board being arranged substantially perpendicularly to the longitudinal direction of the head case, and fitted in the opening of the base ring so that the opening is closed by the circuit board with the audio output circuit facing an inside of the head case portion, wherein the circuit board has a ground pattern connected electrically to the head case portion so that an electro static shield space is formed in the head case portion, wherein the circuit board includes an allover pattern formed of copper foil over a whole back surface on a side opposite to a circuit mounting surface, and wherein the step portion engages a circumferential edge of the circuit board to position the circuit board with respect to the head case portion and establish an electrical connection between the base ring and the allover pattern.