High stiffness speaker cone

Details High stiffness speaker cone High stiffness speaker cone

1977-03-23

1978-09-05

Van Balen, William J.

Stock material or miscellaneous articles

Structurally defined web or sheet

Discontinuous or differential coating, impregnation or bond

179181R, 181166, 156245, 156285, 428 66, 428288, 428317, 428320, B32B 714

Patent

active

041121686

ABSTRACT:
An improved lightweight, stiff member for use as a speaker diaphram is formed from a porous layer of high stiffness fibers. The fibers are randomly oriented, spaced-apart, and crossover each other at given points to form a porous layer with a given thickness. The fibers are bonded to each other at the given crossover points. A gastight film is also bonded to the layer of fibers thereby providing a gastight member having high flexural stiffness.
A method for making a lightweight, stiff member by the application of a dilute solution of an epoxy resin and a solvent to a porous layer of randomly oriented, spaced-apart, high stiffness fibers. The solvent is removed, leaving a thin layer of epoxy resin on the fibers. The porous layer of fibers and a gastight overlying sheet are pneumatically formed into a predetermined configuration. The epoxy resin binder is then heated and cured under heat and pressure, thereby flowing to and forming rigid bonds between the fibers at the crossover points and securing the gastight sheet to the fibers.

REFERENCES:
patent: 2568144 (1951-09-01), Cremer et al.
patent: 2974204 (1961-03-01), Supitilov
patent: 3183996 (1965-05-01), Capaul
patent: 3617654 (1971-11-01), Heidrich
patent: 3649435 (1972-03-01), Varlas
patent: 3930130 (1975-12-01), Boszor

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