Multilayer ceramic capacitor

Patent metadata

Field	Value
Publication number	US-12340947-B2
Application number	US-202318122177-A
Country	US
Kind code	B2
Filing date	Mar 16, 2023
Priority date	Mar 26, 2022
Publication date	Jun 24, 2025
Grant date	Jun 24, 2025

Abstract

A multilayer ceramic capacitor includes a ceramic body including ceramic layers, first internal electrodes, and second internal electrodes laminated in a height direction, a first external electrode on at least part of a first end surface and on part of a first main surface and not on a second main surface, the first external electrode being electrically connected to the first internal electrodes, a second external electrode on at least part of a second end surface and on part of the first main surface and is not on the second main surface, the second external electrode being electrically connected to the second internal electrodes, at least two penetration portions penetrating the ceramic body between the first and second main surfaces, and a reinforcing layer on at least part of the second main surface, the reinforcing layer covering the at least two penetration portions exposed from the ceramic body.

First claim

What is claimed is:

1. A multilayer ceramic capacitor comprising:
a ceramic body including a plurality of ceramic layers, a plurality of first internal electrodes, and a plurality of second internal electrodes laminated in a height direction, the ceramic body including a first main surface and a second main surface facing each other in the height direction, a first end surface and a second end surface facing each other in a length direction orthogonal to the height direction, and a first side surface and a second side surface facing each other in a width direction orthogonal to the height direction and the length direction;
a first external electrode that is provided on at least part of the first end surface and on part of the first main surface and is not provided on the second main surface, the first external electrode being electrically connected to the plurality of first internal electrodes;
a second external electrode that is provided on at least part of the second end surface and on part of the first main surface and is not provided on the second main surface, the second external electrode being electrically connected to the plurality of second internal electrodes;
at least two penetration portions penetrating the ceramic body between the first main surface and the second main surface; and
a reinforcing layer provided on at least part of the second main surface of the ceramic body, the reinforcing layer covering the at least two penetration portions exposed from the ceramic body; wherein
the at least two penetration portions are made of a non-conductive resin or a non-conductive rubber; and
at least one of the at least two penetration portions is in contact with the first external electrode provided on the first main surface.

2. The multilayer ceramic capacitor according to claim 1 , wherein
the plurality of first internal electrodes are electrically connected to the first external electrode on the first end surface of the ceramic body; and
the plurality of second internal electrodes are electrically connected to the second external electrode on the second end surface of the ceramic body.

3. The multilayer ceramic capacitor according to claim 1 , wherein each of the at least two penetration portions has a columnar shape.

4. The multilayer ceramic capacitor according to claim 1 , wherein each of the at least two penetration portions has a tubular shape.

5. The multilayer ceramic capacitor according to claim 1 , wherein the reinforcing layer is made of diamond-like carbon.

6. The multilayer ceramic capacitor according to claim 1 , wherein the ceramic body has a height dimension of about 100 μm or less.

7. The multilayer ceramic capacitor according to claim 1 , further comprising a second reinforcing layer provided on the first main surface of the ceramic body.

8. The multilayer ceramic capacitor according to claim 7 , wherein the second reinforcing layer is provided on a portion of the first main surface of the ceramic body, both the first external electrode and the second external electrode being not provided on the portion.

9. The multilayer ceramic capacitor according to claim 7 , wherein
the second reinforcing layer is provided entirely on the first main surface of the ceramic body; and
a portion of the first external electrode and a portion of the second external electrode are each provided on the second reinforcing layer.

10. The multilayer ceramic capacitor according to claim 1 , wherein each of the at least two penetration portions has a cylindrical shape.

11. The multilayer ceramic capacitor according to claim 1 , wherein each of the at least two penetration portions has a height equal or substantially equal to a height of the ceramic body.

12. The multilayer ceramic capacitor according to claim 1 , wherein the reinforcing layer has a thickness of about 5 μm.

13. The multilayer ceramic capacitor according to claim 1 , wherein the reinforcing layer only covers the at least two penetration portions.

14. The multilayer ceramic capacitor according to claim 1 , wherein each of the first external electrode and the second external electrode are L-shaped or substantially L-shaped.

15. The multilayer ceramic capacitor according to claim 1 , wherein each of the at least two penetration portions has a circular tubular shape, a quadrangular tube shape, or a pentagonal tube shape.

16. The multilayer ceramic capacitor according to claim 1 , wherein each of the at least two penetration portions has a hollow tubular shape.

17. The multilayer ceramic capacitor according to claim 1 , wherein at least one of the at least two penetration portions is in contact with each of the first external electrode provided on the first main surface and the reinforcing layer.

Assignees

• Murata Manufacturing Co

Inventors

• Onishi Kosuke
• Muramatsu Satoshi
• Watanabe Yukie
• Nishimura Ryo

Classifications

• H01G4/232

  electrically connecting two or more layers of a stacked or rolled capacitor · CPC title

• H01G2/065

  for surface mounting, e.g. chip capacitors · CPC title

• H01G4/12

  Ceramic dielectrics {(H01G4/085 takes precedence)} · CPC title

• H01G4/012

  Form of non-self-supporting electrodes · CPC title

• H01G4/005

  Electrodes · CPC title