Multilayer Ceramic Structure With Asymmetric Ridge Curvature
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Solution Overview
Problem
The side sections in conventional multilayer ceramic electronic devices become thinner toward the edges, reducing the impact-reducing effect against external impacts.
Innovation Solution
A multilayer ceramic electronic device design featuring a protection section with a ridge portion having a first ridgeline portion with a larger radius of curvature than a second ridgeline portion, and a manufacturing method that includes forming these ridgelines with specific curvatures to enhance impact resistance and stress distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the side section is made thinner towards the edges in the stacking direction of internal electrodes, then the device complexity is reduced, but the impact-reducing effect against external impacts deteriorates
Solution Approach 1:
The patent applies asymmetry by making the first ridgeline portion (adjacent to cover section) have a larger radius of curvature than the second ridgeline portion (adjacent to side margin section). This asymmetric design allows the side section to have varying thickness with different curvature radii, optimizing both structural integrity and impact resistance without requiring uniform thickness throughout.
Solution Approach 2:
The patent uses curvature by forming ridgeline portions with specific radius of curvature values at the corners where cover section and side margin section meet. The first ridgeline portion has a larger radius of curvature while the second has a smaller radius, creating smooth transitions that distribute impact forces effectively while maintaining a compact structure.
2Ease of manufacture
If the side section is made thinner towards the edges in the stacking direction of internal electrodes, then the manufacturing process is simplified, but the structural integrity under impact deteriorates
Solution Approach 1:
The asymmetric configuration of ridgeline portions with different radius of curvature values provides varying thickness in the side section, which simplifies the manufacturing process by reducing material usage while maintaining structural integrity through optimized geometry at critical stress points.
Solution Approach 2:
The patent applies local quality by providing different radius of curvature values at different locations - the first ridgeline portion adjacent to the cover section has a larger radius while the second ridgeline portion adjacent to the side margin section has a smaller radius. This localized variation optimizes strength where needed while maintaining ease of manufacture overall.
3Reliability
If the radius of curvature of the first ridgeline portion is made larger than the second ridgeline portion, then the impact force distribution is improved, but the manufacturing precision requirements increase
Solution Approach 1:
The asymmetric design with different radius of curvature values for the two ridgeline portions optimizes impact force distribution by creating a gradient in curvature. The first ridgeline portion has a larger radius and the second has a smaller radius, which naturally distributes stresses more effectively during impact events.
Solution Approach 2:
The patent changes the geometric parameter of radius of curvature to different values for the two ridgeline portions. By setting R1 (first ridgeline) > R2 (second ridgeline), the design optimizes impact resistance while the specific parameter range can be adjusted based on manufacturing capabilities to balance performance and precision requirements.
Data Source
AI summary
A multilayer ceramic electronic device includes a ceramic element body. The active section includes a plurality of internal electrodes stacked in a second direction orthogonal to a first direction. The protection section includes a cover section stacked on the active section along the second direction and a side margin section covering the active section from a third direction orthogonal to the first direction and the second direction. The ridge portion includes a first ridgeline portion on a side of the cover section and a second ridgeline portion on a side of the side margin section, with the recess between the first ridgeline portion and the second ridgeline portion. In a cross section including the second direction and the third direction, a radius of curvature R1 of the first ridgeline portion is larger than a radius of curvature R2 of the second ridgeline portion.