| 摘要 |
PROBLEM TO BE SOLVED: To provide what is called a dynamic type electro-acoustic transducer that is reducible in the number of necessary components and assembly man-hour. SOLUTION: A magnetic circuit configuration member including a yoke 2 with a fixed permanent magnet 4 forms a cylindrical magnetic gap, and a voice coil 7 which is fixed to a diaphragm 6 and vibrates integrally with the diaphragm 6 is arranged in the magnetic gap. The yoke 2 is held by a frame 1, an outer peripheral edge of the diaphragm 6 is fixed to the frame 1, and a thin air layer is formed between the yoke 2 and frame 1. The thin air layer operates as a damper which links an air chamber formed on a back side of the diaphragm 6 to the outside with suitable acoustic resistance. COPYRIGHT: (C)2013,JPO&INPIT |
