Laminated Ceramic Capacitor Color Contrast Electrode Orientation
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Solution Overview
Problem
The manufacturing of laminated ceramic electronic components with small dimensions is complicated due to the difficulty in distinguishing the surface direction of internal electrodes, leading to potential variations in stray capacitance and properties when mounting on a circuit board.
Innovation Solution
A laminated ceramic electronic component design featuring an inner layer with internal electrodes and an outer layer with a differently colored ceramic dielectric layer, made of perovskite compounds including Ca and Zr or Ba and Ti, and a glass layer to prevent moisture ingress and enhance reliability, allowing easy identification of the internal electrode direction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a mark is formed using ceramic paste through printing and drying, then the indication mark becomes permanent after sintering, but the manufacturing process becomes complicated with extra steps and positional displacement occurs
Solution Approach 1:
The indication mark formation process is merged with the ceramic dielectric layer formation process. The mark-forming ceramic paste is applied together with the dielectric ceramic paste in the same printing step, and both are sintered simultaneously in a single firing process. This eliminates separate printing and drying steps for the mark, reducing manufacturing complexity while ensuring the mark becomes permanently integrated into the ceramic structure after sintering.
2Ease of manufacture
If the laminated ceramic electronic component has a square cross section, then the component design is simplified, but it becomes difficult to distinguish the surface direction of the internal electrode from appearance
Solution Approach 1:
The indication mark uses a ceramic paste with a different color from the dielectric ceramic paste to create visual contrast. This color difference allows the mark to be clearly visible on the square cross-section component, enabling easy identification of the internal electrode surface direction while maintaining the simple square design. The colored mark becomes permanently visible after sintering along with the ceramic layers.
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 simplifies manufacturing by clearly indicating the internal electrode direction and improves reliability by preventing moisture entry and ensuring secure electrode fixation, thus maintaining consistent properties and performance.
Implementation Method 1
the outer ceramic dielectric layer being made of a perovskite type compound including Ca and Zr, the inner ceramic dielectric layer and the inner layer portion being made of a perovskite type compound including Ba and Ti
Implementation Method 2
a glass layer to prevent moisture ingress and enhance reliability
Data Source
AI summary
A laminated ceramic capacitor includes a laminate including an inner layer portion including a ceramic dielectric layer and an internal electrode, and an outer layer portion defined by a ceramic dielectric layer. At both end portions of the laminate, external electrodes are connected to the internal electrode. In the outer layer portion, a glass layer is provided. An outer ceramic dielectric layer positioned outwardly of the glass layer has a different color from the color of an inner ceramic dielectric layer positioned inwardly of the glass layer.