| 摘要 |
PURPOSE:To decrease the transmission loss of a driving force produced in a voice coil, by incorporating a cone part contacted with node circles of the primary resonance frequency of a flat diaphragm and a bobbin with the voice coil. CONSTITUTION:A voice coil 9 is wound on the outer circumference of a bobbin 8 of a coupling body 6 incorporatedly formed with a cone 7 and the bobbin 8. The coupling 6 is supported with a damper 11 to a frame 10 provided with an upper plate 1 so that the voice coil 9 is possible for piston movement in a magnetic gap 5. A cone 7 of the coupling 6 is contacted to node circles of the primary resonance frequency in a flat diaphragm 12 and supported to the frame 10 at an edge 13 so as to be possible for piston movement. Thus, the absorption of the vibrating energy due to an adhesives can be reduced, allowing to deliver sure driving force. |
