| 摘要 |
PURPOSE:To improve the reliability by adopting a type of material having excellent expanding/contracting property in a flat shape for a flat diaphragm edge. CONSTITUTION:The plane edge 9 formed with a mold plane at the upper/lower part of the flat diaphragm 3 and its outer circumference is placed to the frame 2 in a magnetic circuit 1 so as to clip the plate 3. Moreover, a diaphragm assembly with a gascket 5 adhered to the outer circumference of the edge 9 is adhered, the voice coil 5 fitted in the magnetic gap of the circuit 1 is supported by a damper 7 at the center and the coil is driven by a coupling 8 to deliver the torque of the coil 6 to the node of the diaphragm 3. The amplitude of the diaphragm 3 depends on the expansion/contraction of the material itself (mold plane, urethane, rubber or the like) forming the edge. Thus, the deterioration in the transient characteristic at a low sound range is prevented, the deterioration in the distortion factor is improved to improve the reliability.
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