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:
Oct. 12, 2004
Filed:
May. 08, 2001
Mitsuhiro Masuda, Shizuoka, JP;
Takahiro Sone, Shizuoka, JP;
Star Micronics Co., Ltd., Shizuoka, JP;
Abstract
An electroacoustic transducer includes a base made of a magnetic material; a magnetic core made of a magnetic material and upstanding on the base ; a diaphragm made of a magnetic material and spaced from a leading end of the magnetic core; a magnetic field generating member cooperating with the base , the magnetic core and the diaphragm to constitute a magnetic circuit, for supplying a static magnetic field; a coil placed around the magnetic core, for supplying an oscillating magnetic field to the magnetic circuit. The magnetic field generating member constitutes a multiplex ring structure in which a magnet a and a support ring are integrated together, whose faces opposing the diaphragm have respectively magnetic poles of the same polarity.