Multilayer Capacitor Segmented Metal Oxide Moisture Protection
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Solution Overview
Problem
Multilayer ceramic capacitors face challenges in maintaining moisture resistance reliability while minimizing size and capacitance, as thick cover layers increase component size and reduce capacitance.
Innovation Solution
A multilayer capacitor design featuring a stack structure with dielectric and internal electrodes, external electrodes, and a multilayer metal oxide structure that includes a discontinuous first metal oxide layer and a covering second metal oxide layer to prevent moisture and plating solution intrusion, with the second metal oxide layer having a multilayer structure and filling grooves on the body surface.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a thick cover layer is formed to improve moisture resistance reliability, then moisture resistance reliability is improved, but component size increases and capacitance decreases
Solution Approach 1:
The protective cover layer is segmented into a first metal oxide layer and a second metal oxide layer with different functions. The first layer provides baseline protection while the second layer with protrusions provides enhanced protection at critical areas, allowing thinner overall coverage while maintaining reliability
Solution Approach 2:
The second metal oxide layer forms protrusions that concentrate protective coverage at specific locations where moisture penetration is most likely to occur, such as around internal electrode terminals, rather than uniformly thickening the entire cover layer
2Reliability
If a thick cover layer is formed to prevent moisture penetration, then moisture resistance reliability is improved, but capacitance decreases at the same size
Solution Approach 1:
The cover layer is divided into two functional layers: the first metal oxide layer providing general protection and the second metal oxide layer with protrusions providing targeted protection at high-risk areas, enabling reduced overall material usage while maintaining protection effectiveness
Solution Approach 2:
The second metal oxide layer concentrates its protective function at specific locations (protrusions) where moisture penetration is most likely, allowing the majority of the capacitor body to maintain optimal dimensions for capacitance while still achieving reliable moisture protection
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The design enhances moisture resistance reliability while maintaining a small component size and capacitance by effectively blocking external moisture and plating solutions, ensuring improved performance in high-frequency applications.
Implementation Method 1
a first metal oxide layer disposed between the first and second electrode layers and having a discontinuous region; and a second metal oxide layer covering at least a portion of a surface of the body on which the external electrodes are not disposed
Data Source
AI summary
A multilayer capacitor includes a body including a stack structure in which a plurality of dielectric layers are stacked and a plurality of internal electrodes are stacked with the dielectric layers interposed therebetween, external electrodes formed on an external surface of the body to be connected to the internal electrodes, and including a first electrode layer covering a first surface of the body to which the internal electrodes are exposed, and a second electrode layer covering the first electrode layer, a first metal oxide layer disposed between the first and second electrode layers and having a discontinuous region, and a second metal oxide layer covering at least a portion of a surface of the body on which the external electrodes are not disposed and having a multilayer structure.