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:
Apr. 08, 2003
Filed:
Dec. 07, 2000
Applicant:
Inventors:
Yoshihisa Ishihara, Tochigi-ken, JP;
Takeshi Aoki, Imaichi, JP;
Satoshi Iwasaki, Utsunomiya, JP;
Hirotoshi Kakuta, Utsunomiya, JP;
Assignee:
JSP Corporation, Tokyo, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G10K 1/300 ; H04R 7/00 ;
U.S. Cl.
CPC ...
G10K 1/300 ; H04R 7/00 ;
Abstract
The present invention provides a speaker unit comprising a diaphragm of 0.5 to 10 mm thick aromatic polycarbonate with a density of 0.03 to 0.6 g/cm , and a mechanism for driving the diaphragm. The aromatic polycarbonate used for the diaphragm is preferably derived from bisphenol with a viscosity average molecular weight of 25,000 to 70,000. The invention further provides a speaker system comprising such a speaker unit attached to a cabinet and a method for manufacturing the speaker diaphragm.