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:
Sep. 30, 2003
Filed:
Dec. 22, 2000
Kazushige Tajima, Shizuoka, JP;
Star Micronics Co., Ltd., Shizuoka, JP;
Abstract
An electroacoustic transducer is constituted by a base formed of magnetic material; a magnetic core formed of magnetic material and provided erectly on the base ; a diaphragm formed of magnetic material and supported with an air gap between the diaphragm and a forward end of the magnetic core; a magnet constituting a magnetic circuit together with the base , the magnetic core and the diaphragm so as to provide a magnetostatic field; a coil disposed around the magnetic core for applying an oscillating magnetic field to the magnetic circuit; a housing molded integrally with the base and the magnet , and so on. The housing has notch holes extending from a bottom surface thereof to the magnet