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:
Apr. 19, 2011
Filed:
Jan. 31, 2006
Applicants:
Tomohiro Sugiura, Tokyo, JP;
Shunji Yoshida, Tokyo, JP;
Inventors:
Tomohiro Sugiura, Tokyo, JP;
Shunji Yoshida, Tokyo, JP;
Assignee:
Mitsubishi Denki Engineering Kabushiki Kaisha, Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H04R 25/00 (2006.01);
U.S. Cl.
CPC ...
Abstract
An acoustic apparatus has permanent magnetsand, which have north poles and south poles magnetized alternately in a stripe-like fashion, at the front and back of a diaphragm, respectively; and has a conductor circuitwired on the diaphragmalong the stripe-like poles of the permanent magnetsand. This offers an advantage of being able to prevent an echo. The diaphragm, permanent magnetsand, conductor circuit, spacer, and iron platesandare installed in a baffle