Is a
Patent attributes
Patent Jurisdiction
Patent Number
Patent Inventor Names
Shunji Takeda0
Koji Matsumoto0
Satoshi Hachiya0
Date of Patent
October 13, 2009
0Patent Application Number
115265750
Date Filed
September 26, 2006
0Patent Primary Examiner
Patent abstract
A diaphragm for a speaker is made by forming acrylic foam. As the material of the acrylic foam, using maleic anhydride and methacrylic amide are contained. Thereby, the coefficient of saturated water absorption can be reduced. When the diaphragm thus manufactured is used for a speaker device, the decrease of strength due to the water absorption and the deterioration of the sound quality can be prevented even in a humid environment.
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