Loudspeaker diaphragm

Details Loudspeaker diaphragm Loudspeaker diaphragm

1976-03-15

1978-02-28

Tomsky, Stephen J.

Acoustics

Diaphragm

Critically defined material or coating

181166, 181169, 427412, D10K 1300, H04R 700, D06N 318

Patent

active

040760987

ABSTRACT:
This invention relates to loudspeaker diaphragms and methods of making such diaphragms. It is an object of the invention to improve damping of standing waves formed in a loudspeaker diaphragm. To this end a diaphragm in accordance with the invention is made of textile material impregnated with a stiffening material which does not completely fill the spaces between the threads of the textile material, said spaces being partially filled with damping material. The textile material is preferably a woven glass-fiber fabric or a fabric woven or knitted from an aramid fiber. The stiffening material is preferably a synthetic resin, for example, a phenolic, epoxy or melamine resin and the damping material is preferably a polyvinyl-acetate emulsion or a vinyl resin-based thermoplastic material of the kind used as a cone edge dampener.

REFERENCES:
patent: 1118675 (1914-11-01), Owen et al.
patent: 2171389 (1939-08-01), Cate
patent: 2549091 (1951-04-01), Hopkins
patent: 3093207 (1963-06-01), Bozak
patent: 3627567 (1971-12-01), Tensho
patent: 3937905 (1976-02-01), Manger

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