Low-Profile Multilayer Ceramic Capacitor Layout for Bending Strength
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Solution Overview
Problem
Multilayer ceramic capacitors require a low-profile design to fit within the structural limitations of substrates and electronic devices, but this poses a challenge in ensuring both handleability and sufficient bending strength.
Innovation Solution
A multilayer ceramic capacitor design featuring a ceramic body with specific dimensions and electrode configurations, including ridges covered by external electrodes, internal electrodes arranged in an X-shape, and optimized external electrode dimensions to enhance stability and handleability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of stationary object
If the multilayer ceramic capacitor is designed with a low-profile shape (first dimension ≤110 μm) to fit substrate structural limitations, then the profile height is reduced and space is saved, but the bending strength and handleability deteriorate
Solution Approach 1:
The patent transitions from a square planar shape (where length≈width) to a rectangular planar shape (where length>width, specifically 1.15≤length/width<1.40). This dimensional change in the planar configuration allows the capacitor to maintain sufficient bending strength through increased length while keeping the profile height low, thus resolving the contradiction between low-profile design and bending strength requirement.
2Strength
If the multilayer ceramic capacitor is designed with a square shape (0.85≤W/L≤1) to maintain bending strength, then the bending strength is preserved, but the handleability and ease of use during manufacturing deteriorate
Solution Approach 1:
The patent applies asymmetry by designing the capacitor with a rectangular planar shape where length≠width (specifically 1.15≤length/width<1.40), rather than a symmetric square shape. This asymmetric design provides clear directional orientation (longitudinal and lateral directions) that improves handleability during manufacturing and assembly, while the increased length dimension maintains sufficient bending strength.
3Ease of operation
If the multilayer ceramic capacitor is designed with a rectangular shape (length>width) to improve handleability, then the ease of handling is improved, but the bending strength may be compromised if not properly optimized
Solution Approach 1:
The patent optimizes specific geometric parameters to resolve the contradiction: the length/width ratio is controlled within 1.15≤length/width<1.40, and the profile height is limited to ≤110 μm. These parameter changes ensure that the rectangular shape provides improved handleability while the dimensional constraints maintain sufficient bending strength.
Data Source
AI summary
A multilayer ceramic capacitor includes a ceramic body and first to fourth external electrodes. The ceramic body has first to fourth side surfaces, first to fourth ridges connecting the two side surfaces, and first and second internal electrodes. External electrodes cover the respective ridges and are connected to internal electrodes. The multilayer ceramic capacitor has a height dimension T of 110 μm or less, and a ratio of a width dimension W to a length dimension L of 0.5 or more and less than 0.85. The internal electrodes extend obliquely outward relative to the X-axis and Y-axis directions from the facing portions, and have lead-out portions towards the ridges.