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:
May. 11, 2004
Filed:
Sep. 11, 2000
Shigeru Watanabe, Yamagata, JP;
Other;
Abstract
In a speaker, a magnet is disposed at a mid position of a voice coil bobbin mounted on a cone . A couple of voice coils and are put around the circumferential outer surface of the voice coil bobbin at the positions thereof facing one end and the other end of the magnet . A magnet is disposed within the voice coil bobbin , and develops two magnetic fields in a state that the first and second voice coils and are located between the one and other ends of the first magnet . Dampers and support the voice coil bobbin at positions such that the voice coil bobbin is axially vibratory. Those positions are located on both sides of and symmetrical with respect to those portions of the voice coil bobbin which are respectively wound with the voice coils and