Vibratory elements for audio equipment

Details Vibratory elements for audio equipment Vibratory elements for audio equipment

1981-03-09

1982-08-10

Van Balen, William J.

Acoustics

Diaphragm

Critically defined material or coating

428338, 428408, 524496, B32B 900, B32B 516, G10K 1300

Patent

active

043433766

ABSTRACT:
Vibratory elements for use in audio equipment are fabricated from a kneaded mixture comprising post-chlorinated polyvinyl chloride 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 desird 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: 2996489 (1961-08-01), Dannis et al.
patent: 3399103 (1968-08-01), Salyer et al.
patent: 3399104 (1968-08-01), Ball et al.
patent: 4221773 (1980-09-01), Tsukagoshi et al.
patent: 4254184 (1981-03-01), Tsukagoshi et al.
patent: 4261580 (1981-04-01), Tsukagoshi et al.
patent: 4265952 (1981-05-01), Caines
patent: 4269416 (1981-05-01), Yoshino et al.
patent: 4282288 (1981-08-01), Yoshino et al.

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