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:
Oct. 31, 2006
Filed:
Mar. 02, 2004
Katsuhiko Tsumori, Kobe, JP;
Akira Nishikawa, Kobe, JP;
Hiroshi Kowaki, Kobe, JP;
Hiroyuki Yoshii, Ikoma, JP;
Katsuhiko Tsumori, Kobe, JP;
Akira Nishikawa, Kobe, JP;
Hiroshi Kowaki, Kobe, JP;
Hiroyuki Yoshii, Ikoma, JP;
Fujitsu Ten Limited, Hyogo, JP;
Timedomain Corporation, Nara, JP;
Abstract
A weight is attached to the rear side of a magnetic circuit of a speaker unit. The tip of a boss that projects from the front side of the weight is joined to the rear side of a center pole of the magnetic circuit with a bolt. Even if reactive force that is generated when an electrical signal is converted into mechanical vibration by the magnetic circuit and a voice coil and sound waves are emitted from a vibration plate is transmitted to the magnetic circuit, the vibration of the magnetic circuit is suppressed by the weight. In this manner, sound quality with a good transient characteristic can be obtained.