Inductor and method for manufacturing inductor

By using strip wire coil conductors and blank protective film to cover the insulating film in the inductor, combined with the overlapping design of external electrodes, the problems of external electrode depression and solder boiling in the inductor are solved, thereby improving the reliability and installation stability of the inductor.

CN122095446APending Publication Date: 2026-05-26MURATA MFG CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
MURATA MFG CO LTD
Filing Date
2024-11-22
Publication Date
2026-05-26

AI Technical Summary

Technical Problem

In existing inductors, the insulating film exposed on the surface of the blank at the lead-out portion of the coil conductor is difficult to completely remove, which increases the risk of surface depression of the external electrode and solder boiling.

Method used

The coil conductor uses a strip wire, and the insulating film of the lead-out part is covered by the protective film of the blank. During the plating process, the external electrode is overlapped on the overlapping part of the protective film to form an external electrode to cover the insulating film and avoid direct contact.

Benefits of technology

It effectively suppresses the formation of surface depressions on external electrodes and the risk of solder boiling, thereby improving the reliability and installation stability of the inductor.

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Abstract

The invention provides an inductor and a method for manufacturing the inductor, which can suppress the formation of an external electrode on an insulating film of a lead-out part on the surface of a blank, suppress the surface depression of the external electrode, and suppress the entry of moisture into the external electrode. The inductor includes: a coil conductor formed of a strip-shaped conductor having a conductor and an insulating film, the coil conductor having a pair of first and second lead-out portions; a green body containing magnetic particles and a resin and containing a coil conductor therein; a green body protective film covering the surface of the green body; and an external electrode connected to the first lead-out portion and the second lead-out portion exposed from the surface of the body. The green body has a mounting surface and a pair of end surfaces orthogonal to the mounting surface, one main surface of at least one of the first lead-out portion and the second lead-out portion is exposed from the end surfaces of the green body, and the shape of an exposed portion exposed from the end surfaces has two sides substantially parallel to the mounting surface of the green body in a plan view. The green body protective film includes an overlapping portion that covers a distant side of the exposed portion on a side distant from the mounting surface and overlaps the exposed portion, and the external electrode extends to a surface of the overlapping portion.
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Citation Information

Patent Citations

  • Surface mounting inductor and method of manufacturing the same

    JP2016058418A

  • Information processing device, method, and program

    JP2024024547A