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:
Feb. 13, 2001
Filed:
Jul. 13, 1999
Takashi Sabato, Matsusaka, JP;
Kazuhiro Oshika, Matsusaka, JP;
Matsushita Electric Industrial Co., Ltd., Osaka, JP;
Abstract
A flat loudspeaker of superior quality for use in audio appliances, in which loudspeaker the generation of abnormal sounds is eliminated by placing a voice coil with a high accuracy in the magnetic gap. A diaphragm is split into a main diaphragm (,) and a sub-diaphragm (,); a voice coil (,) is connected to the inner circumference of the main diaphragm (,) whose inner diameter is substantially identical with the diameter of the magnetic gap (,). In the loudspeaker, the voice coil (,) is placed in a right positioning without inclination and eccentricity relative to the magnetic gap (,), abnormal sounds are eliminated, and a thinner configuration and a lower rejection rate are made compatible.