Inductance element

Abstract

The invention provides an inductance element. Material covering the outer surface of a core main body of a magnetic core is not liable to deform due to temperature changes, and exhibits stable magnetic properties. An inductance element with a coil is embedded into the magnetic core. The magnetic core includes a core main body and a cover resin layer, wherein the core main body contains magnetic powder and is molded by compression, and the cover resin layer covers the outer surface of the core main body. At least a part of terminals made of metal and connected to the coil is exposed instead of being covered by the cover resin layer on the outer surface of the core main body. A terminal conductive layer formed by conductive material and adhesive resin is arranged on the surface of the magnetic core. The terminal conductive layer is connected to the cover resin layer and the terminals. The cover resin layer is formed by epoxy modified organic silicon resin.

Description

technical field [0001] The present invention relates to an inductance element in which a coil is embedded in a magnetic core. Background technique [0002] In an inductance element in which a coil is embedded in a magnetic core, a metal plate terminal extending from the coil is exposed on the outer surface of the magnetic core, and the metal plate terminal is usually connected by soldering and mounted on a receiving portion of an external circuit formed on a wiring board. [0003] In a small inductance element, since the size of the coil is small, the metal plate terminal protruding to the outside of the magnetic core is also small, and the connection area for soldering with the external circuit cannot be sufficiently ensured, and conduction reliability cannot be ensured. , and the fixing strength of the contact member on the substrate is also reduced. [0004] In the contact member described in Patent Document 1 below, a coil is provided by winding a covered lead wire arou...

AI Technical Summary

Problems solved by technology

[0010] For the contact member described in Patent Document 1, since epoxy resin and diallyl resin are used as the insulating resin material constituting the exterior resin, heating is performed for purposes other than curing the material. In the case where the use environment of the contact part reaches a high temperature, there is a problem that the stress is applied to the barrel core covered with the outer resin due to the deformation of the insulating resin material caused by the heat, and deformation occurs. change

[0011] Therefore, as the exterior resin, it is also considered to use an insulating resin material that is less deformed by heat, but in this case, due to the difference in adhesiveness with the conductive paste forming the above-mentioned connection terminal portion, it is impossible to ensure the contact between the conductive paste and the exterior. Due to the adhesiveness of the resin, the conductive paste is easy to peel off, the reliability of the conduction with the external circuit cannot be ensured, and there is a concern that the fixing strength of the contact parts on the wiring board may also decrease.

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