Multilayer coil component

Patent metadata

Field	Value
Publication number	US-12354785-B2
Application number	US-202117490411-A
Country	US
Kind code	B2
Filing date	Sep 30, 2021
Priority date	Oct 2, 2020
Publication date	Jul 8, 2025
Grant date	Jul 8, 2025

Abstract

A multilayer coil component includes: an element body containing a plurality of metal magnetic particles; a coil disposed in the element body; and an external electrode disposed on a surface of the element body and electrically connected to the coil. At least a part of a void part between the metal magnetic particles in the element body is filled with a first resin, the external electrode has a resin electrode containing a second resin and a conductor powder dispersed in the second resin, and the second resin connected from the resin electrode extends into the element body.

First claim

What is claimed is:

1. A multilayer coil component comprising:
an element body containing a plurality of metal magnetic particles;
a coil disposed in the element body; and
an external electrode disposed on a surface of the element body and electrically connected to the coil, wherein
at least a part of a space between the metal magnetic particles in the element body is filled with a first resin,
the external electrode has a resin electrode containing a second resin and a conductor powder dispersed inside of the second resin,
the second resin connected from the resin electrode penetrates inside of the element body,
the external electrode has a base baking electrode between the resin electrode and the element body, and
the second resin wraps around the base baking electrode so as to extend into the element body and further extends to a part where the element body and the base baking electrode are in contact with each other in the element body.

2. The multilayer coil component according to claim 1 , wherein the first resin and the second resin are bonded to each other in the element body.

3. The multilayer coil component according to claim 2 , wherein the first resin and the second resin are the same kind of resin.

4. The multilayer coil component according to claim 1 , wherein the second resin extends to a part where the element body and the resin electrode are not in contact with each other in the element body.

5. The multilayer coil component according to claim 1 , wherein second resin penetrates inside of the element body so as to fill a void of the element body existing entirely beyond a boundary of the element body.

Assignees

• Tdk Corp

Inventors

• Nagai Yusuke
• Suzuki Takashi
• Ebina Kazuhiro
• Kawasaki Kunihiko
• Kondo Shinichi
• ISHIMA Yuya
• Sato Shinichi
• Nakagawa Seiichi
• Yasuda Keito
• Wada Ryuichi

Classifications

• H01F1/28

  dispersed or suspended in a bonding agent · CPC title

• H01F2017/048

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

• H01F27/292 Primary

  Surface mounted devices · CPC title

• H01F27/24

  Magnetic cores · CPC title

• H01F27/04

  Leading of conductors or axles through casings, e.g. for tap-changing arrangements · CPC title