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:
Sep. 22, 2009
Filed:
Jun. 13, 2008
Applicant:
Toshio Itakura, Tsuru, JP;
Inventor:
Toshio Itakura, Tsuru, JP;
Assignee:
Citizen Electronics Co., Ltd, Yamanashi-Ken, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H01F 7/02 (2006.01); H04R 9/06 (2006.01);
U.S. Cl.
CPC ...
Abstract
An electroacoustic transducer has a magnetic circuit unit including a plate-shaped yoke, first and second magnets juxtaposed on the yoke, and first and second top plates mounted on the respective tops of the first and second magnets. One end of the first magnet is magnetized to one of north and south poles. The other end of the first magnet is opposite in polarity to the one end. The second magnet is magnetized to polarities opposite to those of the first magnet. A magnetic gap is formed between the first and second top plates.