Electronic component

Patent metadata

Field	Value
Publication number	US-12020852-B2
Application number	US-202117371793-A
Country	US
Kind code	B2
Filing date	Jul 9, 2021
Priority date	Jul 16, 2020
Publication date	Jun 25, 2024
Grant date	Jun 25, 2024

Abstract

An electronic component includes a composite body made of a composite material of resin and magnetic metal particles, an inner electrode which is provided in the composite body and which has an end surface exposed from an outer surface of the composite body, and a metal film provided on the outer surface of the composite body and on the end surface of the inner electrode. The metal film includes a first region provided on the end surface of the inner electrode and a second region which is in contact with the magnetic metal particles exposed at the outer surface of the composite body and which is provided on the outer surface of the composite body. The thickness of the first region is less than the thickness of the second region.

First claim

What is claimed is:

1. An electronic component comprising:
a composite body made of a composite material of resin and magnetic metal particles;
an inner electrode which is provided in the composite body and which has an end surface exposed from an outer surface of the composite body; and
a metal film provided on the outer surface of the composite body and on the end surface of the inner electrode, wherein
the metal film includes a first region provided on the end surface of the inner electrode and a second region which is provided on the outer surface of the composite body and which is in contact with the magnetic metal particles exposed at the outer surface of the composite body, and
a thickness of the first region is less than a thickness of the second region.

2. The electronic component according to claim 1 , further comprising:
a cover layer covering the metal film.

3. The electronic component according to claim 1 , wherein
the cover layer includes a first cover layer covering the metal film, and
the first cover layer is made of Ni.

4. The electronic component according to claim 3 , wherein
the cover layer further includes a second cover layer covering the first cover layer, and
the second cover layer is made of Au.

5. The electronic component according to claim 2 , wherein
the metal film is made of Cu, and
in the second region, the thickness of the metal film is greater than the thickness of the cover layer.

6. The electronic component according to claim 1 , wherein
the end surface of the inner electrode is lower than the outer surface of the composite body.

7. The electronic component according to claim 1 , wherein
the magnetic metal particles include Fe-based magnetic particles.

8. The electronic component according to claim 1 , further comprising:
an inductor wiring provided in the composite body, wherein
the metal film defines at least part of an external terminal electrically connected to the inductor wiring with the inner electrode interposed therebetween.

9. The electronic component according to claim 2 , wherein
the cover layer includes a first cover layer covering the metal film, and
the first cover layer is made of Ni.

10. The electronic component according to claim 3 , wherein
the metal film is made of Cu, and
in the second region, the thickness of the metal film is greater than the thickness of the cover layer.

11. The electronic component according to claim 4 , wherein
the metal film is made of Cu, and
in the second region, the thickness of the metal film is greater than the thickness of the cover layer.

12. The electronic component according to claim 2 , wherein
the end surface of the inner electrode is lower than the outer surface of the composite body.

13. The electronic component according to claim 3 , wherein
the end surface of the inner electrode is lower than the outer surface of the composite body.

14. The electronic component according to claim 4 , wherein
the end surface of the inner electrode is lower than the outer surface of the composite body.

15. The electronic component according to claim 5 , wherein
the end surface of the inner electrode is lower than the outer surface of the composite body.

16. The electronic component according to claim 2 , wherein
the magnetic metal particles include Fe-based magnetic particles.

17. The electronic component according to claim 3 , wherein
the magnetic metal particles include Fe-based magnetic particles.

18. The electronic component according to claim 4 , wherein
the magnetic metal particles include Fe-based magnetic particles.

19. The electronic component according to claim 2 , further comprising:
an inductor wiring provided in the composite body, wherein
the metal film defines at least part of an external terminal electrically connected to the inductor wiring with the inner electrode interposed therebetween.

20. The electronic component according to claim 3 , further comprising:
an inductor wiring provided in the composite body, wherein
the metal film defines at least part of an external terminal electrically connected to the inductor wiring with the inner electrode interposed therebetween.

Assignees

• Murata Manufacturing Co

Inventors

• Otani Shinji
• Imaeda Hiroki
• Sasajima Namiko
• Sunaga Tomohiro
• Okado Masami
• Yoshioka Yoshimasa

Classifications

• H01F27/2804 Primary

  Printed windings · CPC title

• H01F27/255

  made from particles (H01F27/26 takes precedence) · CPC title

• H01F2027/2809

  on stacked layers · CPC title

• H01F19/04

  Transformers or mutual inductances suitable for handling frequencies considerably beyond the audio range (resonant circuits H03H) · CPC title

• H01F27/292 Primary

  Surface mounted devices · CPC title