| 摘要 |
PURPOSE:To prevent rasping sound due to approached mouth to a microphone device, by forming a wall and a projected wall at the back of a case and forming sound introducing holes for the walls. CONSTITUTION:The back side of a case of a handset is provided with a ring shaped wall 3 forming the 1st opening 2 and a projected wall 5 forming the 2nd opening 4 apart from the wall at the inside of the wall 3. A sound introducing hole 6 is formed for the wall 3 of the case, a sound introducing space 7 is for the projected wall 5 at the end of the 2nd opening 4. The front side ride having a sound introducing hole 9 is inserted to the 1st opening 2 of the wall 3, the end is closed to the end surface of the wall 5 and the entire surface of the 2nd opening 4 is covered with the end surface of the microphone main body. |
