| 摘要 |
PURPOSE:To assemble a voice coil in a magnetic gap of a magnetic circuit without eccentricity, by providing a hole having the same or over the voice coil diameter for the center of a flat diaphragm, assembling the voice coil in the hole and coupling the coil with the flat diaphragm via a drive cone. CONSTITUTION:A magnetic circuit 14 consists of a plate 16 having a center pole 15, a ring shape magnet 17, and a ring shaped upper plate 18. A circumference of an edge 22 sticked to the circumference of a flat diaphragm 21 is coupled to the circumference of a frame 19 together with a gasket 20. A hole 23 is provided at the center of the diaphragm 21 and a cap 28 is sticked to the hole 23. A drive cone 24 is sticked to the lower surface of the diaphragm 24 and a voice coil 25 is coupled. |
