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. 07, 2014
Filed:
Jan. 12, 2011
Applicants:
Yoshimichi Kajihara, Mie, JP;
Yohei Jin, Mie, JP;
Toru Fujii, Shiga, JP;
Inventors:
Assignee:
Panasonic Corporation, Osaka, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H04R 1/00 (2006.01); H04R 31/00 (2006.01); H04R 7/12 (2006.01);
U.S. Cl.
CPC ...
H04R 31/003 (2013.01); H04R 2499/13 (2013.01); H04R 7/12 (2013.01); H04R 2307/021 (2013.01);
Abstract
A diaphragm is formed of paper manufactured from a first fiber material and a second fiber material. The first fiber material is beaten to have a given freeness, and the second fiber material is made by carbonizing bamboo fiber that has been fibrillated into a microfibril state. This structure allows the second fiber material to increase a rigidity of the diaphragm and also increase an internal loss, so that sound quality of the speaker that employs this diaphragm can be improved.