Wire wound electronic part

Abstract

The invention provides a wire wound electronic part of a termination electrode which has a peeling strength identical with that of an existent Ag termination electrode without forming a coating; the wire wound electronic part (10) includes a ferrite core (11) comprising ferrite having a columnar wound core part (11a) and flanges (11b),(11c) formed at both ends thereof, a coil conductor (12) wound around the wound core part of the ferrite core, and at least a pair of terminal electrodes (16A) having a Cu conduction layer disposed to the outer surface of the flange, in which both ends of the coil conductor wound around the wound core part are conductively connected to the terminal electrodes. The terminal electrode is formed by coating an electrode paste containing a Cu powder and a glass frit to the outer surface of the ferrite core, and then applying a heat treatment to the ferrite core. There is a reaction layer (16d) of a portion of the ferrite core and the glass frit at a boundary between the ferrite core and the Cu conduction layer. So the terminal electrode has the peeling strength identical with that of the existent Ag terminal electrode.

Description

technical field [0001] The present invention relates to a wire-wound electronic component used in portable electronic devices, thin electronic devices, and the like. Background technique [0002] Wound-type electronic components are used as coils for DC / DC power supply buck-boost circuits in portable electronic devices such as mobile phones and digital still cameras, or as choke coils for peripheral circuits of various flat-panel displays. . Especially for the above-mentioned applications, electronic components are required to have a small and thin external dimension capable of high-density mounting or low-profile mounting while ensuring desired inductance characteristics. [0003] Patent Document 1 describes an example of the above-mentioned wire wound electronic component. A wound wire type electronic component has, for example, a ferrite core, a pair of terminal electrodes provided on the ferrite core, and a coil wire wound around the ferrite core. Oxygen core, while i...

AI Technical Summary

Problems solved by technology

[0012] However, as described in the above-mentioned Patent Document 2, for example, a conductive paste mainly composed of copper is coated on the outer edge of the magnetic core to form a pair of electrodes for lead wire extraction, and then the magnetic core is placed in the H 2 , CO gas and other reducing atmosphere or N 2 , Ar gas and other neutral atmosphere in an oxygen concentration of

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