Vibratory elements for audio equipment

Details Vibratory elements for audio equipment Vibratory elements for audio equipment

1981-03-18

1982-12-07

Van Balen, William J.

Stock material or miscellaneous articles

Hollow or container type article

Polymer or resin containing

428338, 428408, 524431, B32B 108, B32B 500, B32B 900

Patent

active

043627722

ABSTRACT:
Vibratory elements for use in audio equipment are fabricated from a kneaded mixture comprising polypropylene and flaky graphite powder. The kneaded mixture is rolled into a sheet in which graphite flakes are oriented parallel to the surface, and the sheet is then formed into a desired shape, for example, a dome- or cone-shaped diaphragm and a cantilever, as by vacuum forming, air-pressure forming or press molding. The mixture may further include polymethyl methacrylate and/or rubber-like material. The elements are characterized by improved temperature resistance.

REFERENCES:
patent: 3923697 (1975-12-01), Ellis
patent: 4199628 (1980-04-01), Caines
patent: 4254184 (1981-03-01), Tsukagoshi et al.
patent: 4261580 (1981-04-01), Tsukagoshi et al.
patent: 4269416 (1981-05-01), Yoshino et al.
patent: 4282288 (1981-08-01), Yoshino et al.

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