Laminated ceramic capacitor

Patent metadata

Field	Value
Publication number	US-9607766-B2
Application number	US-201214406905-A
Country	US
Kind code	B2
Filing date	Oct 24, 2012
Priority date	Jun 19, 2012
Publication date	Mar 28, 2017
Grant date	Mar 28, 2017

Abstract

A laminated ceramic capacitor is characterized in that when the section constituted by two internal electrode layers positioned adjacent to each other in the laminating direction and one dielectric layer present between the two internal electrode layers is considered a unit capacitor, then the respective capacitances of the unit capacitors arranged in the laminating direction are distributed in such a way the capacitance at the center in the laminating direction is lower than the capacitances at both ends in the laminating direction. The laminated ceramic capacitor is resistant to deterioration of insulation resistance.

First claim

What is claimed is:

1. A laminated ceramic capacitor with a capacitor body having a structure in which multiple internal electrode layers are laminated with dielectric layers placed in between, wherein when a section constituted by two internal electrode layers positioned adjacent to each other in a laminating direction and one dielectric layer present between the two internal electrode layers is considered a unit capacitor, then respective capacitances of multiple unit capacitors arranged in the laminating direction are distributed in such a way that the capacitance at a center in the laminating direction is lower than the capacitances at both ends in the laminating direction,
wherein the respective capacitances of multiple unit capacitors arranged in the laminating direction are distributed in such a way that they gradually decrease from the unit capacitors at both ends in the laminating direction toward the unit capacitor at the center in the laminating direction.

2. A laminated ceramic capacitor according to claim 1 , wherein the dielectric layers each have a thickness of 1.0 μm or less.

3. A laminated ceramic capacitor according to claim 1 , wherein a number of the internal electrode layers is 100 or more.

4. A laminated ceramic capacitor according to claim 2 , wherein a number of the internal electrode layers is 100 or more.

5. A laminated ceramic capacitor according to claim 1 , wherein the capacitance distribution in the laminating direction is formed as a result of sintering a laminate for the laminated ceramic capacitor at a temperature rising rate of 5,000° C./hr to 10,000° C./hr.

6. A laminated ceramic capacitor according to claim 1 , wherein unit capacitors at both ends in the laminating direction contain more sintering auxiliaries than do unit capacitors at the center in the laminating direction.

7. A laminated ceramic capacitor according to claim 1 , wherein the capacitor body further comprises two different external electrodes, and the multiple internal electrode layers are alternately connected to the different external electrodes in the laminating direction.

Assignees

• Taiyo Yuden Kk

Inventors

• Saito Kenji

Classifications

• H01G4/30 Primary

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

• H01G4/1236

  based on zirconium oxides or zirconates (H01G4/1263 takes precedence) · CPC title

• 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

• H01G4/12

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