| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a boundary microphone capable of protecting a pressure sensitive switch from intrusion of electromagnetic waves from the outside, such as of a mobile phone, and preventing a boundary microphone body from causing a malfunction and noise due to adverse effects of electromagnetic waves. <P>SOLUTION: A pressure sensitive switch 1 comprises: a circuit board 2 on which an electrode pattern 5 for detecting electrical conduction is formed; a membrane 4 having a conductive surface; and a spacer 3 sandwiched by the membrane 4 and the circuit board 2. The electrode pattern 5 is surrounded by a ground pattern 20 formed on the surface of the circuit board. The ground pattern on the surface is connected to a ground pattern 21 on the reverse surface of the circuit board 2. A spacer 3 is made of conductive material, and the conductive surface of the membrane 4. The conductive surface of the membrane 4, the ground pattern 20 on the surface of the circuit board 2, and the spacer 3 are electrically conducted to each other. The electrode pattern 5 is arranged between the conductive surface of the membrane 4 and the ground pattern 21 on the reverse surface of the circuit board 2. <P>COPYRIGHT: (C)2012,JPO&INPIT |
