Inductance element and method for manufacturing inductance element

Abstract

The invention provides an inductance element and a method for manufacturing the inductance element. The inductance element can prevent short circuit even though the inductance element gets close to an inductance element which contains Ag on a surface electrode layer on an installing substrate. The inductance element comprises a press powder core body, a coil buried in the press powder core body, and a terminal portion electrically connected with the coil through welding. The terminal portion comprises a Cu base material and a surface electrode layer formed on the surface of the Cu base material. The surface electrode layer is formed by Ag or alloy of Ag. The terminal portion comprises a solder joint portion which is joined with a welding portion welded on the coil relative to the installing substrate by a solder. The thickness of the side of the surface electrode layer which is provided with the welding portion is thicker than the thickness of the side of the solder joint portion.

Description

technical field [0001] The present invention relates to an inductance element in which a coil is embedded in a magnetic core and a manufacturing method thereof. Background technique [0002] Patent Document 1 discloses an invention related to a coil-encapsulated compressed powder core. The coil-enclosed dust core has a dust core, a coil covering the dust core, and a terminal portion electrically connected to the coil. The dust core is formed of magnetic powder of Fe-based amorphous alloy and binder resin. Both the coil and the terminal portion are formed of a Cu (copper) base material. Surface treatment by plating is applied to the terminal part for soldering with an external circuit. [0003] In order to improve the magnetic properties of the powder core body formed of the magnetic powder of the Fe-based amorphous alloy and the binder resin, heat treatment is preferably performed after molding, so the metal used for the surface treatment of the terminal part needs to be ...

AI Technical Summary

Problems solved by technology

[0005] However, if a surface electrode layer mainly composed of Ag is formed on the surface of the terminal portion as in the coil-enclosed powder core body described in Patent Document 1, when the core bodies are mounted close to each other on the mounting substrate, or with When other electronic components are mounted close to each other, when the coil and the terminal are energized, the Ag contained in the surface electrode layer is exposed due to the action of the battery, and there is a possibility of a short circuit between adjacent terminals due to the exposed Ag.

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