| 摘要 |
PROBLEM TO BE SOLVED: To obtain a boundary microphone generating no spark discharge in a switch operation.SOLUTION: A boundary microphone includes: a microphone unit 6; and a switch section (a button 4, a tube 9, a detection section 10, a comparator, and a switch circuit) that turns on/off an output signal of the microphone unit 6. The switch section (a button 4, a tube 9, a detection section 10, a comparator, and a switch circuit) includes an air chamber 9 and a control section to perform on/off control on the basis of an air pressure of the air chamber 9.SELECTED DRAWING: Figure 2 |
