Loudspeaker vibrating diaphragm and methods for its production
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United States of America Patent
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Aug 11, 1998
Issued Date -
N/A
app pub date -
Jul 2, 1997
filing date -
Nov 30, 1994
priority date (Note) -
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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.
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