Loudspeaker vibrating diaphragm and methods for its production

Details Loudspeaker vibrating diaphragm and methods for its production Loudspeaker vibrating diaphragm and methods for its production

1997-07-02

1998-08-11

Dang, Khanh

Acoustics

Diaphragm

Critically defined material or coating

181170, G10K 1300

Patent

active

057930023

ABSTRACT:
A loudspeaker vibrating diaphragm with has a foam layer and two un-foamed skin layers formed on both sides of the foam layer. The average foaming magnification including the foam layer and two un-foamed skin layers is 1.1-3.0. The average foaming magnification is the ratio of the thickness of the resin after foaming (which equals the sum of the thicknesses of the foamed layer and the two un-foamed layers) to the thickness of the resin before foaming. The foam layer contains foaming bubble cells which are formed with their longer axes arranged in the thickness direction of the diaphragm. The thickness of each un-foamed skin layer is 0.05-0.20 mm.

REFERENCES:
patent: 3834486 (1974-09-01), Tsuge et al.
patent: 4395597 (1983-07-01), Suzuki et al.
patent: 4410768 (1983-10-01), Nakamura et al.
patent: 4478309 (1984-10-01), Kawamura et al.

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