Multilayer Ceramic Capacitor Electrode Layout for Flexural Strength
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Solution Overview
Problem
Multilayer ceramic capacitors face challenges in achieving high flexural strength and reliability, particularly in applications requiring miniaturization and integration, where existing structures do not adequately address the need for improved mechanical stress resistance.
Innovation Solution
A multilayer ceramic electronic component design featuring a ceramic body with internal and external electrodes, where the external electrodes extend onto the ceramic body's surfaces, with specific ratios of shortest to longest distances (A/BW) and lengths (BW/L) optimized to enhance flexural strength and reliability, and the use of dielectric layers with varying thicknesses to prevent dielectric breakdown.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the multilayer ceramic capacitor is miniaturized to meet electronic product requirements, then the size is reduced, but the flexural strength and reliability deteriorate
Solution Approach 1:
The patent changes the geometric parameters of the external electrode extension, specifically controlling the ratio of the shortest distance A to the longest distance BW from both ends of the ceramic body to an end of the external electrode to be 0.95≤A/BW<1.0. This parameter optimization allows the external electrode to provide sufficient mechanical support and stress distribution, maintaining high flexural strength even in miniaturized components.
2Strength
If the external electrode extension is increased to improve flexural strength, then the reliability is improved, but the device complexity increases
Solution Approach 1:
The patent optimizes the extension length of the external electrode by controlling the ratio A/BW to be within 0.95≤A/BW<1.0. This parameter-based approach achieves improved flexural strength without requiring complex structural modifications, maintaining manufacturing simplicity while enhancing mechanical properties.
3Strength
If the ratio A/BW is increased to improve flexural strength, then the reliability is improved, but the manufacturing precision requirements increase
Solution Approach 1:
The patent specifies a practical parameter range of 0.95≤A/BW<1.0 for the external electrode extension geometry. This range is optimized to provide sufficient flexural strength while remaining achievable with conventional manufacturing tolerances, avoiding excessively stringent precision requirements.
Data Source
AI summary
A multilayer ceramic electronic component includes a ceramic body having first and second surfaces opposing each other in a first direction, third and fourth surfaces opposing each other in a second direction, and fifth and sixth surfaces opposing each other in a third direction; and an external electrode disposed on one of the third and fourth surfaces and extending onto the first and second surfaces of. A relational expression of 0.9≤A/BW<1.0 is satisfied, where a shortest distance, in the second direction, from an end portion of the ceramic body which the external electrode is disposed at to an end portion of the external electrode disposed on one of the first and second surfaces, is denoted by “A”, and a longest distance, in the second direction, from the end portion of the ceramic body to the end portion of the external electrode, is denoted by “BW”.