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:
Mar. 15, 2016
Filed:
Dec. 19, 2013
Panasonic Corporation, Osaka, JP;
Toshiyuki Matsumura, Osaka, JP;
Shuji Saiki, Nara, JP;
Abstract
A speaker device includes: a magnetic circuit including a plate, a magnethaving no through-hole, and a yokeforming a magnetic gap; a voice coildisposed in the magnetic gap; a diaphragmdirectly or indirectly fixed to the voice coil; and a magnetic fluiddisposed in at least a space between an outer peripheral surface of the voice coiland an inner peripheral surface of the yoke. A rear surface side space between a rear surface of the diaphragmand a front surface of the platecommunicates with a space outside the speaker device through a gap-for-communicationwhich is formed in at least a part, in a peripheral direction of the voice coil, of the space between the outer peripheral surface of the plateand the inner peripheral surface of the voice coil