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. 01, 2004
Filed:
Apr. 26, 2002
Applicant:
Inventors:
Kazumi Miyamoto, Yamanashi-ken, JP;
Masahito Furuya, Yamanashi-ken, JP;
Assignee:
Citizen Electronics Co., Ltd., Fujiyoshida, JP;
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H04R 9/02 ;
U.S. Cl.
CPC ...
H04R 9/02 ;
Abstract
A loudspeaker has first and second diaphragms provided in a case. A first voice coil is provided for vibrating the first diaphragm, and a second voice coil is provided for vibrating the second diaphragm. A first permanent magnet is provided for applying a magnetic flux to the first voice coil, and a second permanent magnet is provided for applying a magnetic flux to the second voice coil.