| 摘要 |
PROBLEM TO BE SOLVED: To provide a microphone directivity of which is adjusted easily.SOLUTION: A microphone has a diaphragm, a fixed pole 44 constituting a capacitor between the diaphragm, a support 47 for supporting the fixed pole 44, and an acoustic resistor 5 covering a sound hole 47h formed in the support 47. A sound wave passes through a first acoustic resistance material 45, and a second acoustic resistance material 46, and passes from the sound hole 47h through a sound wave passing body 51 constituting the acoustic resistor 5. Acoustic resistance value of the acoustic resistor 5 is set depending at least on the radial length of the sound hole 47h of the acoustic resistor 5.SELECTED DRAWING: Figure 9 |
