| 摘要 |
PROBLEM TO BE SOLVED: To provide constant directional characteristics, without being affected by the environment when the microphone is used.SOLUTION: A microphone has a tubular first acoustic tube 12, a first opening 121 provided in the wall surface of the first acoustic tube 12, a tubular second acoustic tube 13 provided while having a gap 15 between the inside of the wall surface of the first acoustic tube 12, a second opening 131 provided in the wall surface of the second acoustic tube 13, a microphone unit provided in the second acoustic tube 13, and acquiring external sound waves, and a sound wave introduction path formed of the first opening 121, the gap 15 and the second opening 131, and transmitting the external sound wave to the microphone unit.SELECTED DRAWING: Figure 2 |
