| 摘要 |
PURPOSE:To eliminate the peak of a secondary resonance by having air having a projection at a part of a part bonded to a driving cone, a plane diaphragm bonded with a skin material at one direction of a side reverse to the driving cone, and having the adhesives layer of a viscosity with a constant width between a secondary resonance and a peak. CONSTITUTION:In the frequency of the secondary resonance, a plane diaphragm and a driving cone 8 are rigid bodies, and therefore, they are going to be the resonance state, but since adhesives 7 of the viscosity, for which a constant range is determined, absorb the resonace at a projection 10, the peak does not occur and thereafter, the high area characteristic is smoothly attenuated. Thus, for the plane speaker, the wide frequency band is expanded and the transient response comes to be satisfactory. The network element to eliminate the conventional peak is not necessary and the network circuit can be simplified.
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