Multilayer ceramic capacitor

Details Multilayer ceramic capacitor Multilayer ceramic capacitor

2005-12-13

2005-12-13

Thomas, Eric W. (Department: 2831)

Electricity: electrical systems and devices

Electrostatic capacitors

Fixed capacitor

C361S312000

Reexamination Certificate

active

06975502

ABSTRACT:
A multilayer ceramic capacitor including an internal electrode layer, an internal dielectric layer having a thickness of less than 2 μm, and an external dielectric layer is provided, wherein the internal dielectric layer and external dielectric layer contain a plurality of dielectric particles, and when assuming that an average particle diameter of the entire dielectric particles in the internal dielectric layer is D50a (unit: μm), an average particle diameter of the entire dielectric particles existing at a position being away at least by 5 μm from the outermost internal electrode layer in the thickness direction is D50b (unit: μm), a ratio (D50a/D50b) of the D50a and D50b is y (no unit), standard deviation of a particle size distribution of the entire dielectric particles in the internal dielectric layer is σ (no unit), and a ratio that dielectric particles (coarse particles) having an average particle diameter of 2.25 times of the D50a exist in the entire dielectric particles is p (unit: %), the y and x satisfy a relationship of y<−0.75x+2.015 and y>−0.75x+1.740, the σ satisfies σ<0.091 and the p satisfies p<2.85%; by which a TC bias characteristic can be expected to be improved while maintaining various electric characteristics, particularly a sufficient permittivity, even when the internal dielectric layer is made thin.

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