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:
Aug. 21, 2018
Filed:
Dec. 03, 2015
Applicant:
Panasonic Intellectual Property Management Co., Ltd., Osaka, JP;
Inventors:
Yuichi Kobayashi, Okayama, JP;
Masahiko Miyazaki, Okayama, JP;
Assignee:
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H04B 1/00 (2006.01); H04R 9/06 (2006.01); H04R 7/18 (2006.01); H04R 7/12 (2006.01); H04R 9/02 (2006.01);
U.S. Cl.
CPC ...
H04R 9/06 (2013.01); H04R 7/12 (2013.01); H04R 7/18 (2013.01); H04R 9/025 (2013.01); H04R 2201/028 (2013.01); H04R 2499/13 (2013.01);
Abstract
A loudspeaker includes a bottom plate, an internal magnet, an internal plate, an external magnetic part, a frame, a diaphragm, and a voice coil. The internal plate includes a cutout portion so that the internal plate is smaller than the internal magnet when viewed from the top surface of the internal plate. Between the voice coil and the internal plate, there are a holding portion holding magnetic fluid and a void part having a void. The magnetic fluid is held in part of the cutout portion.