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:
Jun. 29, 2004
Filed:
Nov. 19, 2001
Hiroyuki Takewa, Kaizuka, JP;
Mikio Iwasa, Katano, JP;
Mitsukazu Kuze, Osaka, JP;
Shinya Tabata, Mie Pref., JP;
Shinya Mizone, Tsu, JP;
Yoshiyuki Takahashi, Matsuzaka, JP;
Satoshi Koura, Mie Pref., JP;
Takashi Suzuki, Mie Pref., JP;
Teruo Doi, Tsu, JP;
Kiyoshi Ikeda, Matsuzaka, JP;
Hiroko Yamazaki, Matsuzaka, JP;
Matsushita Electric industrial Co., Ltd., Kadoma, JP;
Abstract
A diaphragm is gained by the co-molded of a dome part, a voice coil junction part, a cone part and a peripheral part through the injection mold of thermoplastic resin. The thickness of the central part of the dome is made great so that the resonance amplitude in this part becomes small. In addition, an annular rib is integrally provided to the voice coil junction part so as to increase the junction strength between the diaphragm and the voice coil bobbin. Thus, the electromagnetic driving force of the voice coil can be effectively transmitted to the diaphragm so that a loud speaker with excellent characteristics can be gained.