Vibratory elements for audio equipment
AssigneePioneer Electronic Corporation
InventorsTsunehiro Tsukagoshi, Shinichi Yokozeki, Sumio Hagiwara, Masataka Uchidoi, Toshikazu Yoshino, Yasuyuki Arai
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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.
Claims12
An acoustic vibratory element fabricated from a kneaded mixture comprising polypropylene, polymethyl methacrylate and flaky graphite powder, the graphite flakes being oriented substantially parallel to the surface of the element.
Dependencies are inferred from the claim text.