The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Oct. 13, 2009
Filed:
Sep. 26, 2006
Applicants:
Satoshi Hachiya, Yamagata, JP;
Koji Matsumoto, Yamagata, JP;
Shunji Takeda, Ehime, JP;
Inventors:
Assignees:
Pioneer Corporation, Tokyo, JP;
Tohoku Pioneer Corporation, Tendo-Shi, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
C08J 9/00 (2006.01); G10K 11/00 (2006.01);
U.S. Cl.
CPC ...
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.