Inductors and methods for manufacturing inductors

Abstract

The present invention increases the fixing strength between a lead-out portion and an external electrode and reduces DC resistance by preventing an insulation coating of a lead-out portion conductive wire from being exposed on the surface of an element body.　This inductor comprises: a coil conductor having a pair of lead-out portions each composed of a conductive wire comprising a conductor and an insulation film coating the periphery of the conductor; an element body containing magnetic particles and resin and enclosing the coil conductor; and an external electrode connected to an exposed part of each lead-out portion exposed from the surface of the element body. In the exposed part of at least one of the lead-out portions, the conductor of the conductive wire is exposed from an opening in the insulation film and extends on the surface of the element body. The area of the exposed surface of the conductor extending on the surface of the element body is greater than the area of the opening in the insulation film.

Claims

1. A coil conductor having a pair of lead-out portions, each consisting of a wire having a conductor and an insulating coating covering the periphery of the conductor, A base body containing magnetic particles and resin, which encloses the coil conductor, An external electrode connected to the exposed portion of the extraction section that is exposed from the surface of the base body, Equipped with, The pair of extensions, at least one of which has an exposed portion, The conductor of the aforementioned wire is exposed from the opening in the insulating coating and extends onto the surface of the substrate. The area of ​​the exposed surface of the conductor extending on the surface of the substrate is larger than the area of ​​the opening of the insulating coating. Inductor.

2. The coil conductor has a winding portion in which a conductor wire is wound, and an extension portion drawn out from the winding portion. The inductor according to claim 1.

3. The opening in the insulating coating is covered by the conductor extending onto the surface of the substrate, and the insulating coating is not exposed to the surface of the substrate. The inductor according to claim 1.

4. The boundary line between the exposed surface of the conductor extending onto the surface of the substrate and the surface of the substrate includes irregularities. The inductor according to claim 1.

5. In the exposed portion of the aforementioned pull-out section, The surface roughness of the exposed surface of the conductor is greater than the surface roughness of the portion of the conductor where the insulating coating has not been removed. The inductor according to any one of claims 1 to 4.

6. A step of embedding the coil conductor in a substrate such that the lead portions of the coil conductor, which have a pair of lead portions, are exposed from the surface of the substrate containing magnetic particles and resin, The process involves grinding or polishing the surface of the base body in which the lead portion is exposed to remove the insulating coating of the coil conductor wire along the surface of the base body, thereby forming an opening in the insulating coating, and spreading the conductor wire exposed from the opening in the insulating coating on the surface of the base body to form an exposed surface of the conductor, A step of forming an external electrode on the surface of the base body including the exposed surface, Having, A method for manufacturing inductors.

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