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. 16, 2013
Filed:
Nov. 17, 2009
Hiroyuki Takewa, Osaka, JP;
Atsushi Inaba, Mie, JP;
Hiroyuki Takewa, Osaka, JP;
Atsushi Inaba, Mie, JP;
Panasonic Corporation, Osaka, JP;
Abstract
An elongated loudspeaker having high sound quality includes an elongated flat-plate-shaped diaphragm, a frame having an opening portion larger than the diaphragm, an edge placed between an inner periphery of the frame around the opening portion and an outer periphery of the diaphragm allowing the diaphragm to vibrate, a coupling cone extending from a rear surface of the diaphragm and including two elongated portions arranged parallel to a longitudinal direction of the diaphragm, a voice coil wound around at least the two elongated portions, and a magnetic circuit that imparts, to the voice coil, a driving force for generating sound. A distance between the two elongated portions of the coupling cone is smaller at end positions than at root positions. The elongated portions are shaped/sized such that the entire two elongated portions are included within magnetic gaps of the magnetic circuit when the coupling cone vibrates along with the diaphragm.