| 摘要 |
PURPOSE: A sound converter is provided to configure the central part of a vibration plate in a depressed shape, thereby realizing a waterproof function under high water pressure. CONSTITUTION: A magnetic circuit is installed in a frame(110). The magnetic circuit forms a magnetic field between gaps. One part of a coil unit(160) is inserted into the magnetic circuit. A vibration plate(150) is attached to the upper end of the coil unit and the frame. The vibration plate is made of a waterproof film. The central part of the vibration plate has a depressed dome shape. The peripheral unit of the vibration plate is combined with the upper side of the frame by waterproof glue. |
