Multilayer ceramic capacitor with reduced equivalent series inductance

Patent metadata

Field	Value
Publication number	US-12040136-B2
Application number	US-202117506925-A
Country	US
Kind code	B2
Filing date	Oct 21, 2021
Priority date	Nov 6, 2020
Publication date	Jul 16, 2024
Grant date	Jul 16, 2024

Abstract

A multilayer ceramic capacitor includes end-surface external electrodes and side-surface external electrodes. The end-surface external electrodes are respectively provided at end surfaces of a multilayer body and are respectively connected to end-surface connecting internal electrodes. The side-surface external electrodes are respectively provided at the side surfaces of the multilayer body and respectively connected to side-surface connecting internal electrodes. The end-surface connecting internal electrodes each include end surface opposing portion opposing the side-surface connecting internal electrode 15 B adjacent in a lamination direction, and an end surface lead-out portion extending from the end surface opposing portion to one of the end-surface external electrodes. The side-surface connecting internal electrodes each include a side surface opposing portion opposing the end-surface connecting internal electrodes adjacent in the lamination direction, and a side surface lead-out portion extending from the side surface opposing portion to one of the side-surface external electrodes.

First claim

What is claimed is:

1. A multilayer ceramic capacitor comprising:
a multilayer body including:
two end surfaces opposing each other in a length direction intersecting a lamination direction;
two side surfaces opposing each other in a width direction intersecting the lamination direction and the length direction;
internal electrodes including end-surface connecting internal electrodes and side-surface connecting internal electrodes alternately provided with each other in the lamination direction; and
dielectrics alternately laminated with the internal electrodes in the lamination direction;

end-surface external electrodes which are respectively provided at the two end surfaces of the multilayer body and to which the end-surface connecting internal electrodes are connected;
side-surface external electrodes which are respectively provided at the two side surfaces of the multilayer body and to which the side-surface connecting internal electrodes are connected; and
two main surfaces opposing in the lamination direction; wherein
the end-surface connecting internal electrodes each include:
an end surface opposing portion opposing the side-surface connecting internal electrodes adjacent in the lamination direction; and
an end surface lead-out portion extending from the end surface opposing portion to one of the end-surface external electrodes;

the side-surface connecting internal electrodes each include:
a side surface opposing portion opposing the end-surface connecting internal electrodes adjacent in the lamination direction; and
a side surface lead-out portion extending from the side surface opposing portion to one of the side-surface external electrodes;

a distance between the side surface lead-out portions in the lamination direction is larger than a distance between the side surface opposing portions in the lamination direction; and
in a first cross section passing through the width direction and the lamination direction at a middle portion in the length direction, a largest dimension of the multilayer body in the lamination direction is offset from the two side surfaces.

2. The multilayer ceramic capacitor according to claim 1 , wherein in the first cross section passing through the width direction and the lamination direction at the middle portion in the length direction, the two main surfaces each include a raised portion which is raised from a middle portion in the width direction toward the respective side surfaces.

3. The multilayer ceramic capacitor according to claim 2 , wherein the raised portion is provided at a portion on the main surface where end portions of both of the side surface opposing portion and the end surface opposing portion in the width direction are located inside in the lamination direction, and the raised portion extends in the length direction on the main surface.

4. The multilayer ceramic capacitor according to claim 3 , wherein at least one of the side-surface external electrodes covers a portion of the raised portion.

5. The multilayer ceramic capacitor according to claim 3 , wherein at least one of the end-surface external electrodes covers a portion of the raised portion.

6. The multilayer ceramic capacitor according to claim 2 , wherein the raised portion is provided at a portion on the main surface where end portions of both of the side surface opposing portion and the end surface opposing portion in the length direction are located inside in the lamination direction, and the raised portion extends in the width direction on the main surface.

7. The multilayer ceramic capacitor according to claim 6 , wherein at least one of the side-surface external electrodes covers a portion of the raised portion.

8. The multilayer ceramic capacitor according to claim 6 , wherein at least one of the end-surface external electrodes covers a portion of the raised portion.

9. The multilayer ceramic capacitor according to claim 1 , wherein the multilayer body includes a rounded corner portion where three surfaces of the multilayer body intersect, and a rounded ridge line portion where two surfaces of the multilayer body intersect.

10. The multilayer ceramic capacitor according to claim 1 , wherein the dielectrics include ceramic sheets and conductive paste.

11. The multilayer ceramic capacitor according to claim 1 , wherein the multilayer body includes an inner layer portion including the internal electrodes and the dielectrics, and an outer layer made of a same or substantially a same material as the dielectrics and having a predetermined substantially constant thickness.

Assignees

• Murata Manufacturing Co

Inventors

• Ishizuka Akira
• Kokawa Shinichi
• Shimada Yasuyuki

Classifications

• H01G4/30

  Stacked capacitors (H01G4/33 takes precedence) · CPC title

• H01G4/248

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

• H01G4/012 Primary

  Form of non-self-supporting electrodes · CPC title

• H01G4/232 Primary

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