Multilayer Ceramic Capacitor Electrodes With Concave-Convex Lead-Out Parts
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Solution Overview
Problem
Multilayer ceramic capacitors face limitations in increasing capacitance while minimizing defects and short circuits due to lateral displacement and overlap issues between internal electrodes during cutting, especially when using the lower surface as a mounting surface.
Innovation Solution
The design incorporates internal electrodes with lead-out parts having concave-convex portions alternating in the overlap area, exposed on one surface, and covered by an insulating layer, allowing for increased capacitance and reduced risk of short circuits by minimizing the overlap area and preventing defects from lateral displacement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the overlap area between internal electrodes is increased to increase capacitance, then capacitance is improved, but the possibility of short circuits increases due to lateral displacement during cutting
Solution Approach 1:
The patent applies local quality by creating concave portions in specific regions of the internal electrodes (lead-out parts) while maintaining flat or convex portions in other regions. This localized structural modification allows the electrodes to have different geometries in different areas, enabling the lead-out parts to be exposed on the lower surface without increasing overall short circuit risk, thus resolving the contradiction between increasing capacitance and maintaining reliability.
2Ease of operation
If lead-out parts of internal electrodes are exposed to the lower surface for mounting, then ease of mounting is improved, but manufacturing precision deteriorates due to lateral displacement defects during cutting
Solution Approach 1:
The patent creates concave portions in the lead-out parts of internal electrodes, which are specifically positioned to be exposed on the lower surface. This localized geometric modification allows these specific regions to serve as mounting surfaces while the rest of the electrode structure maintains its integrity during cutting, thereby improving ease of mounting without sacrificing manufacturing precision.
Solution Approach 2:
The concave portions are formed in the internal electrodes before the cutting process. This preliminary structural preparation ensures that when cutting occurs, the lead-out parts with concave portions are already positioned to be exposed on the lower surface, preventing lateral displacement defects and ensuring precise exposure of the intended mounting areas.
3Volume of moving object
If internal electrodes are made thinner for miniaturization, then device size is reduced, but manufacturing precision deteriorates due to increased susceptibility to lateral displacement
Solution Approach 1:
The patent introduces concave portions in specific regions of the thin internal electrodes, creating localized structural features that provide geometric constraints. These concave portions act as reference features during cutting and assembly, improving the effective manufacturing precision of thin electrodes without increasing overall device size, thus resolving the contradiction between miniaturization and manufacturing precision.
Data Source
AI summary
There is provided a multilayer ceramic capacitor including: a ceramic body in which a plurality of dielectric layers are stacked; a plurality of first and second internal electrodes alternately formed on the plurality of dielectric layers and including first and second lead-out parts having an overlap area exposed to one surface of the ceramic body, respectively; first and second external electrodes formed on one surface of the ceramic body and electrically connected to the first and second lead-out parts, respectively; and a first insulating layer formed on one surface of the ceramic body to cover exposed portions of the first and second lead-out parts, wherein the first and second lead-out parts are formed to have concave-convex portions alternating with each other in the overlap area therebetween.