Surface-mounting coil component and method of producing the same
First Claim
1. A surface-mounting coil component, comprising:
- a drum-type ferrite core comprising a winding core, and upper and lower flanges provided on each ends of the winding core;
external electrodes provided on a surface of either of the flanges; and
a winding wound around the winding core of the drum-type ferrite core and conductively connected to the external electrodes on both ends,wherein the surface-mounting coil component has a resin coating material with magnetic powder that fills a space between the upper flange and the lower flange of the drum-type ferrite core, covering the winding between the upper flange and the lower flange,and wherein the physical property of the resin coating material with magnetic powder upon hardening is, regarding changes of modulus in torsion to temperature, that a glass transition temperature of about −
20°
C. or lower in a course of transferring from a glass state to a rubber state.
1 Assignment
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Accused Products
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/L1 of an outer diameter L2 of the upper flange to a diameter L1 of the winding core of the drum-type ferrite core is about 1.9 or more.
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Citations
13 Claims
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1. A surface-mounting coil component, comprising:
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a drum-type ferrite core comprising a winding core, and upper and lower flanges provided on each ends of the winding core; external electrodes provided on a surface of either of the flanges; and a winding wound around the winding core of the drum-type ferrite core and conductively connected to the external electrodes on both ends, wherein the surface-mounting coil component has a resin coating material with magnetic powder that fills a space between the upper flange and the lower flange of the drum-type ferrite core, covering the winding between the upper flange and the lower flange, and wherein the physical property of the resin coating material with magnetic powder upon hardening is, regarding changes of modulus in torsion to temperature, that a glass transition temperature of about −
20°
C. or lower in a course of transferring from a glass state to a rubber state. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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Specification