CN-115132474-B - Coil component and method for manufacturing coil component

CN115132474BCN 115132474 BCN115132474 BCN 115132474BCN-115132474-B

Abstract

A coil component includes an outer body, a coil, and a pair of terminal electrodes. The coil is disposed in the outer body. The pair of terminal electrodes are electrically connected to the coil and are disposed on the exterior body. The outer package has a first portion that covers the coil and is made of resin, and a second portion that includes side surfaces on which a pair of terminal electrodes are arranged. The second portion includes a material having a lower relative permittivity than that of the resin, and is disposed between the coil and the pair of terminal electrodes.

Inventors

Be Junichiro
KATOH HAJIME
MATSUURA TOSHINORI
Asuda Kazuya
Shiga people
Takubo Yuichi
Kazuta Yangyi
Hamachi Kishiaki

Assignees

TDK株式会社

Dates

Publication Date: 20260508
Application Date: 20220221
Priority Date: 20210311

Claims (8)

1. A coil component, wherein, The device is provided with: An outer body; a coil disposed in the outer body, and A pair of terminal electrodes electrically connected to the coil and disposed on the exterior body, The longitudinal direction of the terminal electrode is along the axial direction of the coil, The outer package has: a first part covering the coil and made of resin, and A second portion provided with the pair of terminal electrodes, The second portion includes a material having a lower relative permittivity than that of the resin, and is disposed between the coil and the pair of terminal electrodes, The dielectric constant of the resin of the first portion and the dielectric constant of the material of the second portion are 4 or less.
2. The coil component of claim 1, wherein, The coil comprises a wire-wound body, The winding has a first winding portion in a spiral shape and a pair of second winding portions, Each of the pair of second winding portions is continuous with a corresponding one of the pair of terminal electrodes, Each of the terminal electrodes has a flat plate shape.
3. The coil component according to claim 2, wherein, The second portion includes a flat side surface provided with the pair of terminal electrodes, Each of the second winding portions has an inner portion disposed in the outer body and an outer portion disposed on the outer body and continuous with the corresponding terminal electrode, The inner portion extends in a direction intersecting the side face, and the outer portion extends in a direction along the side face.
4. The coil component according to claim 2, wherein, The wire has a wire and a coating layer covering the wire and having electrical insulation.
5. The coil component according to claim 3, wherein, The wire has a wire and a coating layer covering the wire and having electrical insulation.
6. The coil component according to any one of claim 1 to 5, wherein, Also provided is a core part which is arranged on the inner side of the coil, The core is composed of a resin.
7. A method for manufacturing a coil component, wherein, Comprising the following steps: a step of preparing a coil; a step of forming an exterior body so as to cover the coil, and A step of disposing a pair of terminal electrodes electrically connected to the coil on the exterior body, The step of forming the exterior body includes: a step of forming a first portion of the coil from resin, and A step of forming a predetermined second portion in which the pair of terminal electrodes are arranged from a predetermined material, In the step of disposing the pair of terminal electrodes, the pair of terminal electrodes are disposed on the package such that the second portion is disposed between the coil and the pair of terminal electrodes, the longitudinal direction of the terminal electrodes is along the axial direction of the coil, The prescribed material has a lower relative permittivity than that of the resin, The dielectric constant of the resin of the first portion and the dielectric constant of the material of the second portion are 4 or less.
8. The method for manufacturing a coil component according to claim 7, wherein, The step of preparing the coil includes preparing the coil composed of a wire, and forming the pair of terminal electrodes continuous with the wire by pressing both end portions of the wire before the step of disposing the pair of terminal electrodes.

Description

Coil component and method for manufacturing coil component Technical Field The present disclosure relates to a coil component and a method of manufacturing the coil component. Background A known coil component includes a coil formed of a wire, a core around which the wire is wound, a resin member covering substantially the entire coil and core, and terminal electrodes electrically connected to the coil and disposed on the side surfaces of the resin component (for example, refer to japanese patent application laid-open No. 2015-70154). Disclosure of Invention In the conventional coil component described above, stray capacitance is generated by the coil and the terminal electrode facing each other. This stray capacitance may have an influence on the characteristics of the coil block. For example, stray capacitance results in a decrease in the self-resonant frequency in the coil component. Therefore, a technique of suppressing the decrease in the self-resonant frequency is desired. An object of one embodiment of the present invention is to provide a coil component in which a decrease in the self-resonant frequency is suppressed. Another object of the present invention is to provide a method for manufacturing a coil component, which suppresses a decrease in the self-resonant frequency. A coil component according to one embodiment of the present invention includes an exterior body, a coil, and a pair of terminal electrodes. The coil is disposed in the outer body. The pair of terminal electrodes are electrically connected to the coil and are disposed on the exterior body. The exterior body has a first portion which covers the coil and is made of resin, and a second portion in which a pair of terminal electrodes are arranged. The second portion includes a material having a lower relative permittivity than that of the resin, and is disposed between the coil and the pair of terminal electrodes. In the coil component, a second portion including a low dielectric constant material having a lower relative dielectric constant than that of the resin of the first portion is disposed between the coil and the terminal electrode. Accordingly, the stray capacitance generated between the coil and the terminal electrode is reduced by the low dielectric constant material of the second portion, and the reduction of the self-resonance frequency in the coil part is suppressed. In one embodiment, the coil may include a winding wire. The winding may also have a helical first winding portion and a pair of second winding portions. Each of the pair of second winding portions may be continuous with a corresponding one of the pair of terminal electrodes. Each terminal electrode may have a flat plate shape. For example, in the case where physical impact is applied to the coil part, the electrical connection of the terminal electrode and the coil may be cut off. In the structure in which the terminal electrode and the second winding portion of the winding are continuous, even in the case where physical impact is applied to the coil member, the electrical connection between the terminal electrode and the coil is difficult to be cut off. The terminal electrodes each have a flat plate-shaped structure, and electrical connection between the terminal electrodes and other electronic components can be easily achieved when the coil component is mounted on the other electronic components. In the above-described aspect, the second portion may include a flat side surface on which the pair of terminal electrodes are disposed. Each of the second winding portions may have an inner portion disposed in the exterior body and an outer portion disposed on the exterior body and continuous with the corresponding terminal electrode. The inner portion may extend in a direction intersecting the side surface, and the outer portion may extend in a direction along the side surface. In this case, the coil covered by the exterior body and the terminal electrode arranged on the exterior body are more reliably connected by the second winding portion. In one embodiment, the wire may have a wire and a coating layer covering the wire and having electrical insulation. In this case, since the wire of the wire is protected by the coating layer, the wire is hardly damaged even when the wire is bent. In the above-described aspect, the coil component may further include a core portion disposed inside the coil. The core may also be composed of a resin. The other method for manufacturing the coil component includes a step of preparing a coil, a step of forming an exterior body so as to cover the coil, and a step of disposing a pair of terminal electrodes electrically connected to the coil on the exterior body. The step of forming the exterior body includes a step of forming a first portion of the cover coil from a resin and a step of forming a predetermined second portion of the cover coil from a predetermined material, the predetermined second portion being provided with a pair of