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:
Nov. 26, 2002
Filed:
Feb. 26, 2001
Shigeru Sugiyama, Sizuoka, JP;
Hajime Kitamura, Sizuoka, JP;
Naohiro Fujinami, Shizuoka, JP;
Masami Kushida, Shizuoka, JP;
Hisashi Kubota, Shizuoka, JP;
Star Micronics Co., Ltd., Shizuoka, JP;
Abstract
By forming a flange portion ( ) protruding inward in the radial direction at an upper end portion ( ) of a voice coil ( ), a coiling sectional shape of the voice coil ( ) is set to a L-shape. And, the upper end portion ( ) of this voice coil ( ), is bonded and fixed to a central flat portion ( ) of a diaphragm ( ). Hereby, by only increasing slightly the weight of the usual voice coil having an I-shaped coiling section, the large bonding area can be obtained between the voice coil ( ) and the diaphragm ( ), so that separation of the voice coil ( ) can be prevented. Further, since other portions of the voice coil ( ) than the upper end portion ( ) thereof have the usual coil thickness, it is not necessary to expand the width of a cylindrical magnetic gap G in a magnetic circuit unit ( ), whereby it is prevented that electroacoustic conversion efficiency of a speaker ( ) lowers.