Acoustics – Diaphragm – Critically defined material or coating
Patent
1979-10-16
1981-09-29
Chin, Peter
Acoustics
Diaphragm
Critically defined material or coating
162104, 162145, 162146, 162231, 181170, G10K 1300
Patent
active
042917816
ABSTRACT:
A diaphragm for a speaker which is prepared by heating a conjugated sheet obtained by paper-making polyethylene short fibers with other short fibers which have a high modulus of elasticity, such as carbon fiber, to melt and solidify polyethylene short fibers in the conjugated sheet; the process for the production thereof. The diaphragm for a speaker of the invention has a high modulus of elasticity and a high internal loss and a speaker prepared with such a diaphragm has the advantage of having a wider reproducing frequency response and lower distortion. Furthermore, the process for production of the invention possesses another advantage in that diaphragms for speakers can be produced in a continuous process of successively pressing out the speaker diaphragm with a cold mold press.
REFERENCES:
patent: 3253970 (1966-05-01), Williams
patent: 3256138 (1966-06-01), Welch et al.
patent: 3265557 (1966-08-01), DeFries
patent: 3907063 (1975-09-01), Nakazawa et al.
patent: 3930130 (1975-12-01), Boszor
patent: 3935924 (1976-02-01), Nagao et al.
patent: 3946832 (1976-03-01), Takano et al.
patent: 3960794 (1976-06-01), Sander et al.
patent: 4096313 (1978-06-01), Fujita et al.
Ieki Mitsuru
Niguchi Hirotoshi
Chin Peter
Matsushita Electric - Industrial Co., Ltd.
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