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:
Jan. 20, 2004
Filed:
Feb. 07, 2002
Applicant:
Inventor:
Koji Maekawa, Tendo, JP;
Assignee:
Other;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H04R 2/500 ;
U.S. Cl.
CPC ...
H04R 2/500 ;
Abstract
An electromechanical and electroacoustic transducer is compact and has a simple drive circuit. Two independent magnetic circuits share a single permanent magnet. A voice coil is placed in one of the magnetic circuits, and a magnetic weight is placed in the other magnetic circuit. A switching element is turned on and off upon movements of the magnetic weight.