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. 16, 2002
Filed:
Aug. 13, 2001
Mitsuhiro Masuda, Sizuoka, JP;
Takahiro Sone, Sizuoka, JP;
Star Micronics Co., Ltd., Shizouka, JP;
Abstract
An electroacoustic transducer is provided with a diaphragm which is made of a magnetic material, and to which a magnetic piece is fixed; a magnetic core which is placed in proximity to the diaphragm ; a coil which supplies an oscillating magnetic field to the magnetic core ; a housing which accommodates the diaphragm , the magnetic core , and the coil , and which has a sound release opening in a top plate opposed to the diaphragm , the sound release opening being larger than the magnetic piece . A beam portion is formed integrally with the housing which extends from a peripheral portion of the sound release opening to another peripheral portion passing above the magnetic piece . A gap Ga between the diaphragm and the magnetic core , and a gap Gb between the magnetic piece and the beam portion satisfy relationships of Ga≦Gb≦5Ga.