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. 10, 2012
Filed:
Oct. 30, 2007
Kazuyuki Kosuda, Neyagawa, JP;
Yuki Hatanaka, Daito, JP;
Kazuyuki Kosuda, Neyagawa, JP;
Yuki Hatanaka, Daito, JP;
SANYO Electric Co., Ltd., Moriguchi-shi, Osaka, JP;
Abstract
An electroacoustic transducer of the present invention includes a diaphragmhaving a periphery as a fixed end, a coilhaving an axis perpendicular to the diaphragmandattached centrally to the diaphragm, and a direct current magnetic field generator fixed in position as spaced apart from the coilby a gap provided axially of the coil. The diaphragmis driven by applying to the coila magnetic flux emitted from a surface of the direct current magnetic field generator that faces the coil. The direct current magnetic field generator includes a ring-shaped outer magnetlocated coaxially with the axis of the coiland magnetized in the direction perpendicular to the axis, and an inner coreincluding a ferromagnet and located in the central hole of the outer magnet