Acoustics – Diaphragm – Critically defined material or coating
Patent
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.
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Arai Yasuyuki
Hagiwara Sumio
Tsukagoshi Tsunehiro
Uchidoi Masataka
Yokozeki Shinichi
Pioneer Electronic Corporation
Van Balen William J.
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