| 摘要 |
PURPOSE:To obtain a speaker which does not cause a reduction in the minimum resonance frequency, by providing an elastic material between the inside circumference of the voice coil bobbin, and the center pole, so that air of the part surrounded by said elastic material, the diaphragm and the dust cap does not leak to the outside. CONSTITUTION:An elastic material 12 such as edge, damper, etc. is provided between the inside circumference of the voice coil bobbin 5, and the tip of the projection part 11 of the center pole 9. Air of the part surrounded by said elastic material 12, the diaphragm 2 and the dust cap 7 is made not to leak to the outside. According to said constitution, the part surrounded by obliquie lines in the figure operates as air compliance, and its value becomes constant permanently, therefore it is possible to obtain a speaker of high performance, which is free from a drop of the minimum resonance frequency. |
