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. 07, 2009
Filed:
Dec. 16, 2004
Hiroyuki Kobayashi, Yamagata, JP;
Kyoichi Matsuda, Yamagata, JP;
Hiroyuki Kobayashi, Yamagata, JP;
Kyoichi Matsuda, Yamagata, JP;
Pioneer Corporation, Tokyo, JP;
Tohoku Pioneer Corporation, Yamagata, JP;
Abstract
A speaker apparatus including: a first diaphragm; a second diaphragm arranged coaxial with the first diaphragm along a driving direction; a frame having diaphragm supporting portions; and a voice-coil bobbin, wherein outer circumferential portions of the first diaphragm and the second diaphragm are fixed to the diaphragm supporting portions respectively, inner circumferential portions of the first diaphragm and the second diaphragm are connected together and fixed to the voice-coil bobbin so as to make a sealed space between the first diaphragm, the second diaphragm and the frame, and the voice-coil bobbin is supported by springiness of a gas contained in the sealed space.