| 摘要 |
PROBLEM TO BE SOLVED: To obtain a sound tube which is easily manufactured and easily miniaturized and to obtain a directional microphone whose structure is simple and which is easily miniaturized by using the sound tube. SOLUTION: In the integrally molded sound tube 10, an acoustic resistance material 12 arranged on the inner peripheral surfaces of the sound tube 10 is integrated with the sound tube by molding of the sound tube 10. It is desirable that a material of the sound tube 10 is made into resin and the acoustic resistance material 12 is made into mesh of resin. The sound tube 10 has a slit-like acoustic resistance part 11 and it is desirable that the acoustic resistance material 12 exists in the acoustic resistance part 11. It is desirable that the directional microphone is constituted by using the sound tube 10. COPYRIGHT: (C)2007,JPO&INPIT |
