Carbonaceous acoustic diaphragm and method for manufacturing the same
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United States of America Patent
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Oct 1, 2013
Grant Date -
Oct 6, 2011
app pub date -
Dec 8, 2009
filing date -
Dec 18, 2008
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Abstract
A carbonaceous acoustic diaphragm whose density is reduced while retaining the required stiffness is provided. Carbon nanofibers and spherical particles of PMMA are mixed into a carbon-containing resin such as a polyvinyl chloride resin, and the mixture is carbonized to vaporize the spherical particles of PMMA, thereby forming a porous structure having pores with the carbon nanofibers in a powdered form uniformly dispersed through amorphous carbon. By forming a multilayer structure by combining the porous layer with a layer that does not use PMMA, the density can be further reduced while retaining the stiffness.
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