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Sandwich-Construction Loudspeaker Diaphragm with Foamed High-Polymer and Carbon Fiber
In the loudspeaker diaphragm described in this paper, acrylic foam is used for the core and carbon fiber for the skin material, to achieve more rigidity, lower density, easier formability and a higher Young's modulus. Unlike a honeycomb construction, this diaphragm material is relatively easy to form into a curved cone shape. The new diaphragm is at least 300 times more resistant to bending than a paper diaphragm, while nearly equal to paper in internal loss characteristics. The importance of diaphragm rigidity is confirmed by modal analysis and tone-burst tests.
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