Multilayer Ceramic Capacitor Asymmetric Electrode Humidity Resistance
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Multilayer ceramic capacitors lack high humidity resistance due to internal electrode layers being exposed, which affects their performance in high-frequency applications and noise resistance.
Innovation Solution
A multilayer ceramic capacitor design with a rectangular parallelepiped shape, featuring first and second external electrodes covering specific surface regions, where internal electrode layers are alternately stacked with a ceramic dielectric layer, and a mark on one end face aids in alignment and humidity resistance by ensuring the second internal electrode is shifted further on the lower face, reducing exposure and enhancing operational performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If internal electrode layers are exposed to the surface to achieve asymmetrical structure and low loss in high frequency range, then operation performance is improved, but humidity resistance deteriorates
Solution Approach 1:
The patent divides the surface into multiple regions: a first region where the first internal electrode layer is exposed, a second region where the second internal electrode layer is exposed, and a third region where neither electrode layer is exposed. This segmentation allows different portions of the surface to serve different functions - some for electrical connection and some for humidity protection.
Solution Approach 2:
The patent applies different properties to different regions of the surface. The first and second regions have electrode layer exposure for electrical functionality, while the third region has no electrode exposure providing enhanced humidity resistance. This local differentiation resolves the contradiction by allowing both exposed electrodes and protected areas to coexist.
2Reliability
If second internal electrode is shifted further on lower face side to achieve asymmetrical structure, then capacity variation is minimized, but manufacturing complexity increases
Solution Approach 1:
The patent implements asymmetry by shifting the second internal electrode layer further toward the lower face than the first internal electrode layer is toward the upper face. This creates an asymmetric electrode configuration that minimizes capacity variation. The asymmetry is controlled and defined, making it manufacturable despite the non-symmetric appearance.
Solution Approach 2:
This principle is not applicable to this patent as the solution does not involve pneumatic or hydraulic mechanisms.
3Manufacturing precision
If mark is added to indicate shifted position for alignment, then mounting precision is improved, but device complexity increases
Solution Approach 1:
The patent uses a mark with a color different from the dielectric layer to indicate the shifted position of the second internal electrode layer. This color contrast provides visual guidance for correct mounting orientation without adding complex structural elements. The mark serves purely as an informational indicator.
Data Source
AI summary
A ceramic electronic device includes: a multilayer chip having a first and a second internal electrode layers; a first and a second external electrodes covering a first a second regions of a surface of the multilayer chip, wherein: a mark is shifted on a side of one of two end faces on an upper face; the first internal electrode layer is exposed to the first region and connected to the first external electrode; the second internal electrode layer is exposed to the second region and connected to the second external electrode; the second internal electrode is shifted further on a side of the lower face than on a side of the upper face; the second internal electrode layer is shifted further on a side of the lower face than the upper face; the second region is a region of a half of the surface on the lower face side.