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AssigneesSony Corporation, Dai Nippon Ink and Chemicals, Inc.
InventorsMasaru Uryu, Kunihiko Tokura, Yoshio Ohashi, Satoshi Idemura, Michiya Nakashima, Katsuji Takahashi
Estimating the term…
A loudspeaker in which the input resistance is improved and the effect of humidity on the playback frequency response is suppressed, and a method for the preparation of the loudspeaker. A sheet-like product, containing glass particles with a particle size of 8 nm to 300 nm and polyamide resin, and prepared by application of a paper-making technique, is used as the diaphragm. The content of the glass particles in the compound material is 5 weight % to 70 weight %. In preparing the diaphragm, a phase of an aqueous solution containing diamine and water glass is contacted with a phase of an organic solution containing a dicarboxylic acid halide to generate a compound material containing glass particles and the polyamide resin. The compound material so prepared is formed into a sheet by a paper-making technique. In the process of the preparation by the paper-making technique, the compound material mixed with other fibrous material may also be used as a starting material.
A loudspeaker diaphragm comprising an operatively formed sheet-like member made of a compound material comprising glass particles having a particle size of 8 nm to 300 nm and a polyamide resin.
A loudspeaker comprising a diaphragm comprising a sheet-like member operatively formed into a cone, the sheet-like member being made of a compound material K comprising a polyamide resin and glass particles having a particle size of 8 nm to 300, the diaphragm being sufficiently thermally stable for inputs of 40 to 80 watts for a period of 100 hours using EIJA testing standards.
A loudspeaker comprising a diaphragm comprising a sheet-like member operatively formed into a cone, the sheet-like member being made of a compound material comprising a polyamide resin and glass particles having a particle size of 8 nm to 300, the loudspeaker exhibiting substantially the same frequency response characteristics when prior to and after storage in an atmosphere having a temperature of 25 degrees Celsius and 95 percent humidity.
Dependencies are inferred from the claim text.