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US 4,308,094 AGranted
Diaphragm for speaker and method of producing same
AssigneeSanyo Electric Co., Ltd.
InventorsYasushi Miyoshi, Yasuhiro Ishii
Life of this patent
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Abstract
A diaphragm for a speaker obtained by forming a diaphragm base by screen processing a mixture of carbon fiber, pulp and polyvinyl alcohol fiber as a binder in a manner similar to that employed for making paper, depositing a thermosetting resin on the diaphragm base by impregnation or coating, and subjecting the diaphragm base, on which the thermosetting resin has been deposited, to electroless plating to deposit a metal film in the interstices between fibers and on the entire fiber surface.
Claims35
A method of producing a speaker diaphragm comprising the steps of:
- forming a fiber matrix diaphragm base by paper making screen processing an aqueous or water slurry of paper-making pulp fibers in an amount from about 10% to about 50% and carbon fibers in an amount of from about 90% to about 50%, providing a material for binding the matrix of pulp and carbon fibers, and
- subjecting said formed diaphragm base to electroless plating to deposit a metal film of at least about 12% by weight of the diaphragm base for covering substantially the entire surface and intersections of the fibers forming said diaphragm base to further bind the fibers together.
Dependencies are inferred from the claim text.