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. 17, 2006
Filed:
Oct. 03, 2000
Shinya Mizone, Tsu, JP;
Keiji Ishikawa, Matsusaka, JP;
Shoouji Nakajima, Tsu, JP;
Akira Kabumoto, Tokyo, JP;
Satoshi Ono, Kawasaki, JP;
Shinya Mizone, Tsu, JP;
Keiji Ishikawa, Matsusaka, JP;
Shoouji Nakajima, Tsu, JP;
Akira Kabumoto, Tokyo, JP;
Satoshi Ono, Kawasaki, JP;
Matsushita Electric Industrial Co., Ltd., Osaka, JP;
The Furukawa Electric Co., Ltd., Tokyo, JP;
Abstract
The present invention is directed to a speaker using lightweight, highly rigid diaphragm having excellent frequency characteristic and improving resistance to environment (including resistance to UV and resistance to fading). For this end, the speaker utilizes a cone-shaped diaphragm made from foamed or cellular resin such as polyethylene terephthalate (PET) resin or polyethylene naphthalate (PEN) resin with 30 μm average cell size. The use of such cone-shaped diaphragm is effective to improve sound quality of the speaker.