Patent ID: 8787592

Claim:
A boundary microphone comprising: a base; a microphone unit installed in the base and converting sound into an electrical signal; and a membrane pressure-sensitive switch turning on/off the output signal of the microphone unit, the membrane pressure-sensitive switch comprising: a circuit board provided with an electrode pattern detecting electrical conductivity; a membrane having a conductive surface; and a spacer interposed between the membrane and the circuit board, wherein the electrode pattern on a front surface of the circuit board is surrounded by a first ground pattern on the front surface of the circuit board, wherein the first ground pattern on the front surface is connected to a second ground pattern on a rear surface of the circuit board, wherein the spacer comprises a conductive material, wherein the conductive surface of the membrane, the first ground pattern on the front surface of the circuit board, and the spacer are electrically conducted, and wherein the electrode pattern is disposed between the conductive surface of the membrane and the second ground pattern on the rear surface of the circuit board.