Inductor devices – Core forms casing
Reexamination Certificate
2007-04-24
2007-04-24
Mai, Anh (Department: 2832)
Inductor devices
Core forms casing
C336S232000, C336S200000
Reexamination Certificate
active
11022110
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 L2/L1of an outer diameter L2of the upper flange to a diameter L1of the winding core of the drum-type ferrite core is about 1.9 or more.
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Iguchi Koichi
Kashiwa Tomoo
Kuroiwa Katsutoshi
Okamoto Masaki
Samata Takahiro
Knobbe Martens Olson & Bear LLP
Mai Anh
Taiyo Yuden Co. Ltd.
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