| 摘要 |
PURPOSE:To miniaturize the sound field system by designing the diaphragm in a way that at least one part of the cross-sectional shape of the diaphragm in the radiating direction entirely differs from other parts. CONSTITUTION:A magnet 2 is adhered onto a plate 1 with a ball piece and a top plate 3 is adhered. A coil 9 of a voice coil 8 whose surrounding is supported by a damper 7 fixed to a frame 6 is arranged to a magnetic gap 5 so as not to be in contact with the surrounding. A diaphragm 10 is adhered to the coil 8 and the outer circumference of the diaphragm 10 is adhered to the frame 6 via an edge 11. A dust cap 12 is adhered to the tip of the coil 8. A basic shape 10a is adopted for the left half of the diaphragm and other shape 10b is employed for the right half. Since plural speakers are replaced into one speaker in this way, the sound field system is miniaturized.
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