Surface-mounting coil component and method of producing the...

Details Surface-mounting coil component and method of producing the... Surface-mounting coil component and method of producing the...

2007-12-25

2007-12-25

Nguyen, Tuyen T. (Department: 2832)

Metal working

Method of mechanical manufacture

Electrical device making

C336S200000

Reexamination Certificate

active

11788588

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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