Multilayer coil component

Patent metadata

Field	Value
Publication number	US-12525381-B2
Application number	US-202218085983-A
Country	US
Kind code	B2
Filing date	Dec 21, 2022
Priority date	Jan 19, 2022
Publication date	Jan 13, 2026
Grant date	Jan 13, 2026

Abstract

A multilayer coil component includes an element body including an end surface, a coil disposed in the element body, and an external electrode disposed on an end portion of the element body and connected to the coil. The external electrode includes a conductive resin layer. The conductive resin layer includes resin and a plurality of metal particles and is in contact with the end surface. The conductive resin layer includes a metal particle group. The metal particle group consists a plurality of first metal particles included in the plurality of metal particles, and the plurality of first metal particles is adjacent to the end surface and separated from the end surface.

First claim

What is claimed is:

1 . A multilayer coil component comprising:
an element body including a plurality of metal magnetic particles and including a pair of end surfaces opposing each other; a coil disposed in the element body; and a pair of external electrodes respectively disposed on both end portions of the element body in a direction in which the pair of end surfaces oppose each other and connected to the coil, wherein each of the pair of external electrodes includes a conductive resin layer including resin and a plurality of metal particles and in contact with a corresponding end surface of the pair of end surfaces, and the conductive resin layer includes a metal particle group consisting of a plurality of first metal particles included in the plurality of metal particles, the plurality of first metal particles adjacent to the corresponding end surface and separated from the corresponding end surface.

2 . The multilayer coil component according to claim 1 , wherein
the conductive resin layer includes another metal particle group consisting of a plurality of second metal particles included in the plurality of metal particles, the plurality of second metal particles adjacent to the corresponding end surface and in contact with the corresponding end surface, and a position of an end of each of the plurality of first metal particles closest to the end surface and a position of an end of each of the plurality of second metal particles closest to the end surface are different in the direction in which the pair of end surfaces oppose each other.

3 . The multilayer coil component according to claim 1 ,
wherein the plurality of metal particles have an average particle diameter larger than 50% of an average particle diameter of the plurality of metal magnetic particles.

4 . The multilayer coil component according to claim 1 , wherein
the coil includes a plurality of coil conductors electrically connected to each other, the plurality of coil conductors include a pair of coil conductors each including a connection end exposed on the corresponding end surface, each of the pair of end surfaces includes:
a first region where the connection end is exposed; and
a second region opposing a coil conductor, among the plurality of coil conductors, excluding the coil conductor including the connection end exposed in the first region in the direction in which the pair of end surfaces oppose each other,
the conductive resin layer includes a first electrode portion in contact with the first region and a second electrode portion in contact with the second region, and the first electrode portion has a content ratio of the metal particle larger than a content ratio of the metal particle in the second electrode portion.

5 . The multilayer coil component according to claim 4 ,
wherein the content ratio of the plurality of metal particles in the first electrode portion is equal to or more than 80 wt % and equal to or less than 99 wt %, and the content ratio of the plurality of metal particles in the second electrode portion is equal to or more than 70 wt % and equal to or less than 90 wt %.

6 . The multilayer coil component according to claim 1 , wherein
the conductive resin layer includes:
a first electrode portion in contact with the corresponding end surface and including the metal particle group; and
a second electrode portion disposed on the first electrode portion, and
the first electrode portion has a content ratio of the metal particle smaller than a content ratio of the metal particle in the second electrode portion.

7 . The multilayer coil component according to claim 6 ,
wherein the content ratio of the plurality of metal particles in the first electrode portion is equal to or more than 70 wt % and equal to or less than 90 wt %, and the content ratio of the plurality of metal particles in the second electrode portion is equal to or more than 75 wt % and equal to or less than 95 wt %.

8 . The multilayer coil component according to claim 1 , wherein
each of the pair of end surfaces is formed with a recess, and the conductive resin layer is in contact with a surface portion defining the recess, the surface portion included in the corresponding end surface.

9 . The multilayer coil component according to claim 1 , wherein
the coil includes a plurality of coil conductors electrically connected to each other, each of the pair of end surfaces is formed with a recess, the conductive resin layer is in contact with a surface portion defining the recess, the surface portion included in the corresponding end surface, and each of the recesses is formed at a position not overlapping the plurality of coil conductors when viewed in the direction in which the pair of end surfaces oppose each other and a position different from the plurality of coil conductors in a direction intersecting the direction in which the pair of end surfaces oppose each other.

10 . The multilayer coil component according to claim 1 ,
wherein a ratio of an average particle diameter of the plurality of metal particles to an average particle diameter of the plurality of metal magnetic particles is larger than 0.5.

11 . The multilayer coil component according to claim 10 ,
wherein the average particle diameter of the plurality of metal magnetic particles is equal to or more than 1.0 μm and equal to or less than 50 μm, and the average particle diameter of the plurality of metal particles is equal to or more than 0.5 μm and equal to or less than 25 μm.

Assignees

• Tdk Corp

Inventors

• Nagai Yusuke
• Ebina Kazuhiro
• Kawasaki Kunihiko
• Kondo Shinichi
• ISHIMA Yuya
• Sato Shinichi
• Nakagawa Seiichi
• Ito Kosuke
• Yasuda Keito
• Iida Youhei

Classifications

• H01F27/292

  Surface mounted devices · CPC title

• H01F27/022

  Encapsulation · CPC title

• H01F1/36

  in the form of particles {(H01F1/346, H01F1/348 and H01F1/38 take precedence)} · CPC title

• H01F2017/048

  with encapsulating core, e.g. made of resin and magnetic powder · CPC title

• H01F1/26

  by macromolecular organic substances · CPC title