Multilayer ceramic capacitor

Patent metadata

Field	Value
Publication number	US-12374501-B2
Application number	US-202318242569-A
Country	US
Kind code	B2
Filing date	Sep 6, 2023
Priority date	Apr 22, 2020
Publication date	Jul 29, 2025
Grant date	Jul 29, 2025

Abstract

A multilayer ceramic capacitor includes a multilayer body and external electrodes. The multilayer body includes an inner layer portion including dielectric layers and internal electrode layers alternately stacked, and first and second outer layer portions on opposite sides of the inner layer portion in a stacking direction, side gap portions on opposite sides in a width direction, main surfaces on opposite sides in the stacking direction, side surfaces on opposite sides in the width direction, and end surfaces on opposite sides in a length direction. Each external electrode is provided at one end surfaces of the multilayer body, and extends from the end surface to a portion of the main surface. A difference in location between ends at the side surface of two adjacent internal electrode layers is about 0.5 μm or less. The second outer layer portion is thicker than the first outer layer portion.

First claim

What is claimed is:

1. A multilayer ceramic capacitor comprising:
a multilayer body; and
external electrodes; wherein the multilayer body includes:
a multilayer main body including an inner layer portion including dielectric layers and internal electrode layers stacked, and a first outer layer portion and a second outer layer portion on both sides of the inner layer portion in a stacking direction;
side gap portions on both sides of the multilayer main body in a width direction intersecting the stacking direction;
a first main surface and a second main surface opposing each other in the stacking direction;
a first side surface and a second side surface opposing each other in the width direction; and
a first end surface and a second end surface opposing each other in a length direction intersecting the stacking direction and the width direction;

the external electrodes each being provided at the first end surface and the second end surface;
the first outer layer portion is thinner than the second outer layer portion;
in a cross section of the width direction and the stacking direction passing through a center or approximate center of the multilayer body, a line connecting ends of adjacent internal electrode layers in the stacking direction is convex towards an outside;
the side gap portions are provided on ends in the width direction of each of the internal electrode layers; and
a positional deviation between the ends in the width direction of any two adjacent ones of the internal electrode layers in the stacking direction is about 0.5 μm or less.

2. The multilayer ceramic capacitor according to claim 1 , wherein an interface is provided between the multilayer main body and each of the side gap portions.

3. The multilayer ceramic capacitor according to claim 1 , wherein magnesium is segregated at a portion of each of the side gap portions in contact with the internal electrode layers.

4. The multilayer ceramic capacitor according to claim 1 , wherein
each of the side gap portions includes:
an inner side gap layer in contact with the multilayer main body; and
an outer side gap layer in contact with the inner side gap layer.

5. The multilayer ceramic capacitor according to claim 1 , wherein
each of the external electrodes includes:
a foundation electrode layer including a conductive metal and a glass component, and in contact with the multilayer body; and
a conductive resin layer including a thermosetting resin and a metal component, and in contact with the foundation electrode layer.

6. The multilayer ceramic capacitor according to claim 1 , wherein the multilayer body includes rounded corners and ridges.

7. The multilayer ceramic capacitor according to claim 1 , wherein the multilayer body has a dimension in the length direction is about 0.2 mm or more and about 10 mm or less, a dimension in the width direction is about 0.1 mm or more and about 10 mm or less, and a dimension in the stacking direction is about 0.1 mm or more and about 5 mm or less.

8. The multilayer ceramic capacitor according to claim 1 , wherein each of the dielectric layers has a thickness of about 0.5 μm or less.

9. The multilayer ceramic capacitor according to claim 1 , wherein each of the dielectric layers includes BaTiO 3 as a main component.

10. The multilayer ceramic capacitor according to claim 1 , wherein each of the dielectric layers includes at least one of Mn compounds, Fe compounds, Cr compounds, Co compounds, and Ni compounds as a sub-component.

11. The multilayer ceramic capacitor according to claim 1 , wherein each of the internal electrode layers includes at least one of Ni, Cu, Ag, Pd, Au, or Ag—Pd alloy.

12. The multilayer ceramic capacitor according to claim 1 , wherein each of the internal electrode layers has a thickness of about 0.5 μm or more and about 2.0 μm or less.

13. The multilayer ceramic capacitor according to claim 1 , wherein the second outer layer portion is about five times thicker than the first outer electrode portion.

14. The multilayer ceramic capacitor according to claim 1 , wherein
a thickness of the first outer layer portion is about 20 μm or more and about 60 μm or less; and
a thickness of the second outer layer portion is about 100 μm or more and about 300 μm or less.

15. The multilayer ceramic capacitor according to claim 1 , wherein
a thickness of the first outer layer portion is about 40 μm or less; and
a thickness of the second outer layer portion is about 200 μm or more.

Assignees

• Murata Manufacturing Co

Inventors

• Ikeda Mitsuru

Classifications

• H01G4/012

  Form of non-self-supporting electrodes · CPC title

• H01G4/248

  the terminals embracing or surrounding the capacitive element, e.g. caps (H01G4/252 takes precedence) · CPC title

• H01G4/1227

  based on alkaline earth titanates · CPC title

• Y02E60/13

  Energy storage using capacitors · CPC title

• H01G2/02

  Mountings · CPC title