Method of making metal coated foil speaker diaphragm

Details Method of making metal coated foil speaker diaphragm Method of making metal coated foil speaker diaphragm

1979-12-28

1984-09-11

Childs, Sadie L.

Acoustics

Diaphragm

Critically defined material or coating

204192C, 204192N, 427209, 4272481, 427309, 427405, 427409, 427410, 428457, G10K 1300, H04R 700

Patent

active

044704798

ABSTRACT:
A speaker diaphragm of the present invention is prepared in a manner such that a boron layer is formed on one face of a dome-shaped metal foil by means of a physical vapor deposition method such as ion-plating, cathode sputtering, vacuum evaporation or the like, when necessary the metal foil is thinned by etching, and then, if necessary, another boron layer is formed on the other face of the metal foil. Alternatively, a metal layer is formed on the surface of the boron layer. The resultant speaker diaphragm is light in weight and high in modulus and also has appropriate internal mechanical resistance against vibration, thereby providing a speaker of high efficiency and satisfactory characteristics.

REFERENCES:
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patent: 2484519 (1949-10-01), Martin
patent: 2528454 (1950-10-01), Schlesinger et al.
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patent: 3443983 (1969-05-01), Golding et al.
patent: 3499799 (1970-03-01), Patterson
patent: 3702261 (1972-11-01), Feakes et al.
patent: 3712798 (1973-01-01), Van Thyne et al.
patent: 3811930 (1974-05-01), Kuehl et al.
patent: 4135601 (1979-01-01), Tsukagoshi et al.

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