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:
Dec. 12, 2006
Filed:
Jan. 14, 2003
Ryo Kuribayashi, Mie, JP;
Kazuyoshi Umemura, Mie, JP;
Hiroyuki Morimoto, Mie, JP;
Michitaka Oda, Mie, JP;
Ryo Kuribayashi, Mie, JP;
Kazuyoshi Umemura, Mie, JP;
Hiroyuki Morimoto, Mie, JP;
Michitaka Oda, Mie, JP;
Matsushita Electric Industrial Co., Ltd., Osaka, JP;
Abstract
A magnetic circuit of the present invention uses a yoke, wherein a thickness of a bottom portionof the yokeis thicker than a thickness of a cylindrical peripheral portionof the yoke. The magnetic circuit of the present invention includes the yoke, a magnetbonded to the bottom portion of the yoke, and a top platebonded to the magnet, the top plate forming a magnetic gap with the cylindrical peripheral portion in between. According to a configuration of the present invention, it is possible to reduce the magnetic saturation in the bottom portion of the yoke and to improve the efficiency of the magnetic circuit. As a result, the configuration contributes to improve the performance and efficiency of a loudspeaker using the magnetic circuit of the present invention.