Surface-mounting coil component and method of producing the same
First Claim
1. A method of producing a surface-mounting coil component, comprising:
- preparing a drum-type ferrite core in which an upper flange and a lower flange are formed as one body, wherein the lower flange is disposed on the other end of the upper flange facing toward the upper flange;
providing external electrodes that are direct-mounted to the core on the bottom surface of the lower flange;
wrapping a winding around the winding core of the drum-type ferrite core and conductively connecting both ends of the winding to the external electrodes;
filling a paint of a resin coating material with magnetic powder in a space range defined between the upper flange and the lower flange in opposition to this upper flange; and
hardening the paint of the resin coating material with magnetic powder, wherein the filling of the paint of the resin coating material with magnetic powder uses a paint of the resin coating material with magnetic powder having the glass transition temperature of about −
20°
C. or lower in the course of transferring from the glass state to the rubber state during changing of shear modulus with respect to temperature as the physical property when hardening.
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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.
21 Citations
7 Claims
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1. A method of producing a surface-mounting coil component, comprising:
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preparing a drum-type ferrite core in which an upper flange and a lower flange are formed as one body, wherein the lower flange is disposed on the other end of the upper flange facing toward the upper flange;
providing external electrodes that are direct-mounted to the core on the bottom surface of the lower flange;
wrapping a winding around the winding core of the drum-type ferrite core and conductively connecting both ends of the winding to the external electrodes;
filling a paint of a resin coating material with magnetic powder in a space range defined between the upper flange and the lower flange in opposition to this upper flange; and
hardening the paint of the resin coating material with magnetic powder, wherein the filling of the paint of the resin coating material with magnetic powder uses a paint of the resin coating material with magnetic powder having the glass transition temperature of about −
20°
C. or lower in the course of transferring from the glass state to the rubber state during changing of shear modulus with respect to temperature as the physical property when hardening. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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Specification