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:
Feb. 14, 2012
Filed:
Feb. 05, 2007
Applicant:
Kazuyoshi Umemura, Mie, JP;
Inventor:
Kazuyoshi Umemura, Mie, JP;
Assignee:
Panasonic Corporation, Osaka, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H04R 9/02 (2006.01);
U.S. Cl.
CPC ...
Abstract
A magnetic circuit part of a loudspeaker is formed of a plate, a magnet, and a yoke. A step is disposed in the plate that comes into contact with a disc-like magnet and forms a magnetic gap. A loudspeaker is provided where the step moves a voice coil away from the leakage magnetic field of the yoke, the influence of the leakage magnetic field is eliminated even when the output is large, the distortion is small, and the sound quality is high.