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:
Dec. 25, 2007
Filed:
Apr. 19, 2007
Katsutoshi Kuroiwa, Gunma, JP;
Koichi Iguchi, Gunma, JP;
Tomoo Kashiwa, Gunma, JP;
Masaki Okamoto, Gunma, JP;
Takahiro Samata, Gunma, JP;
Katsutoshi Kuroiwa, Gunma, JP;
Koichi Iguchi, Gunma, JP;
Tomoo Kashiwa, Gunma, JP;
Masaki Okamoto, Gunma, JP;
Takahiro Samata, Gunma, JP;
Taiyo Yuden Co., Ltd., Tokyo, JP;
Abstract
A surface-mounting choke coil has a resin coating material with magnetic powder which is filled a space between the upper flange and the lower flange of a drum-type ferrite core, while covering the circumferential of the winding. The resin coating material with magnetic powder has a glass transition temperature Tg of about −20° C. or lower, more preferably about −50° C. or lower in a course of transferring from a glass state to a rubber state during changing of shear modulus with respect to temperature as a physical property when hardening, and the thickness of the upper flange of the drum-type ferrite core is about 0.35 mm or less, and a value of a ratio L/Lof an outer diameter Lof the upper flange to a diameter Lof the winding core of the drum-type ferrite core is about 1.9 or more.