Monolithic ceramic capacitor, monolithic ceramic capacitor array, and monolithic ceramic capacitor mounting structure

Patent metadata

Field	Value
Publication number	US-9818544-B2
Application number	US-201615351517-A
Country	US
Kind code	B2
Filing date	Nov 15, 2016
Priority date	Feb 10, 2014
Publication date	Nov 14, 2017
Grant date	Nov 14, 2017

Abstract

A monolithic ceramic capacitor includes a plurality of first and second inner electrodes in a ceramic body. A direction in which the first and second inner electrodes are stacked is a stacking direction, a direction perpendicular or substantially perpendicular to the stacking direction in the ceramic body is a length direction, and a direction perpendicular or substantially perpendicular to the stacking direction and the first direction is a width direction. The ceramic body includes an effective portion, a first outer layer portion, a second outer layer portion, a first side portion, and a second side portion. A ratio A/B is about 0.04 or less when a dimension of each of the first side portion and the second side portion in the width direction is A and a dimension of the effective portion in the stacking direction is B.

First claim

What is claimed is:

1. A monolithic ceramic capacitor comprising:
a ceramic body including dielectric layers; and
a plurality of inner electrodes stacked so as to oppose each other via one of the dielectric layers interposed therebetween; wherein
a direction in which the plurality of inner electrodes are stacked is a stacking direction, a direction that is perpendicular or substantially perpendicular to the stacking direction is a length direction, and a direction that is perpendicular or substantially perpendicular to the stacking direction and to the first direction is a width direction;
the ceramic body includes an effective portion including the plurality of the inner electrodes, a first outer layer portion and a second outer layer portion sandwiching the effective portion in the stacking direction, and a first side portion, and a second side portion sandwiching the effective portion in the width direction; and
A/B is about 0.027 or more and about 0.030 or less when a dimension of each of the first side portion and the second side portion in the width direction is A and a dimension of the effective portion in the stacking direction is B.

2. The monolithic ceramic capacitor according to claim 1 , wherein
an outer surface of the first outer layer portion that is perpendicular or substantially perpendicular to the stacking direction is a mounting surface; and
when a dimension of the first outer layer portion in the stacking direction is C, C>A is satisfied.

3. The monolithic ceramic capacitor according to claim 1 , wherein
an outer surface of the first outer layer portion that is perpendicular or substantially perpendicular to the stacking direction is a mounting surface; and
when a dimension of the first outer layer portion is C and a dimension of the second outer layer portion is D, C>D is satisfied.

4. The monolithic ceramic capacitor according to claim 1 , wherein
an outer surface of the first outer layer portion that is perpendicular or substantially perpendicular to the stacking direction is a mounting surface; and
when a dimension of the first outer layer portion is C in the stacking direction and a dimension of the second outer layer portion in the stacking direction is D, C>D>A is satisfied.

5. The monolithic ceramic capacitor according to claim 1 , wherein the dimension A is about 17 μm or less.

6. The monolithic ceramic capacitor according to claim 1 , wherein a density of dielectric ceramic in each of the first side portion and the second side portion is less than a density of dielectric ceramic in one of the dielectric layers of the effective portion.

7. The monolithic ceramic capacitor according to claim 1 , wherein
the ceramic body contains dielectric ceramic and glass; and
a content ratio of glass in each of the first side portion and the second side portion is less than a content ratio of glass in one of the dielectric layers of the effective portion.

8. The monolithic ceramic capacitor according to claim 1 , wherein
the ceramic body includes voids; and
a ratio of voids in each of the first side portion and the second side portion is less than a ratio of the voids in one of the dielectric layers of the effective portion.

9. A monolithic ceramic capacitor array comprising:
a carrier tape including a plurality of cavities; and
a plurality of the monolithic ceramic capacitors according to claim 1 that are accommodated in the respective cavities; wherein
the inner electrodes of each monolithic ceramic capacitor are parallel or substantially parallel to a bottom surface of the corresponding cavity.

10. A monolithic ceramic capacitor mounting structure comprising:
a board; and
the monolithic ceramic capacitor according to claim 1 that is mounted on a surface of the board; wherein
the stacking direction is perpendicular or substantially perpendicular to the surface of the board, and the first outer layer portion is positioned closer to the board than the second outer layer portion.

11. The monolithic ceramic capacitor mounting structure according to claim 10 , wherein
an outer surface of the first outer layer portion that is perpendicular or substantially perpendicular to the stacking direction is a mounting surface; and
when a dimension of the first outer layer portion is C, C>A is satisfied.

12. The monolithic ceramic capacitor mounting structure according to claim 10 , wherein
an outer surface of the first outer layer portion that is perpendicular or substantially perpendicular to the stacking direction is a mounting surface; and
when a dimension of the first outer layer portion is C in the stacking direction and a dimension of the second outer layer portion in the stacking direction is D, C>D is satisfied.

13. The monolithic ceramic capacitor mounting structure according to claim 10 , wherein
an outer surface of the first outer layer portion that is perpendicular or substantially perpendicular to the stacking direction is a mounting surface; and
when a dimension of the first outer layer portion in the stacking direction is C and a dimension of the second outer layer portion in the stacking direction is D, C>D>A is satisfied.

14. The monolithic ceramic capacitor mounting structure according to claim 10 , wherein the dimension A is about 17 μm or less.

15. The monolithic ceramic capacitor mounting structure according to claim 10 , wherein a density of dielectric ceramic in each of the first side portion and the second side portion is less than a density of dielectric ceramic in one of the dielectric layers of the effective portion.

16. The monolithic ceramic capacitor mounting structure according to claim 10 , wherein
the ceramic body contains dielectric ceramic and glass; and
a content ratio of glass in each of the first side portion and the second side portion is less than a content ratio of glass in one of the dielectric layers of the effective portion.

17. The monolithic ceramic capacitor mounting structure according to claim 10 , wherein
the ceramic body includes voids; and
a ratio of the voids in each of the first side portion and the second side portion is less than a ratio of the voids in one of the dielectric layers of the effective portion.

Assignees

• Murata Manufacturing Co

Inventors

• Fujita Yukihiro
• Yamada Tadateru

Classifications

• H05K1/183

  associated with components mounted in and supported by recessed areas of the PCBs · CPC title

• H01G4/129

  containing a glassy phase, e.g. glass ceramic · CPC title

• H05K2201/10015

  Non-printed capacitor · CPC title

• H01G4/12 Primary

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

• H01G4/248

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