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Glass-Fiber and Graphite-Flake Reinforced Polyimide Composite Diaphragm for Loudspeakers

A newly developed diaphragm material especially suitable for loudspeaker drivers is described. The new diaphragm using this material features a high Young's modulus and an appropriate mechanical loss. The diaphragm is composed of a glass-fiber fabric base with a polyimide matrix polymer and a flaked graphite filler. Young's modulus for the new diaphragm is ten times higher than that of commonly used paper pulp diaphragms, with about the same mechanical loss.

JAES Volume 31 Issue 10 pp. 723-728; October 1983
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