Asymmetric Electrode Capacitor for Warpage Reduction
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Solution Overview
Problem
Current multilayer ceramic capacitors face limitations in increasing capacitance due to challenges in developing high-permittivity materials and reducing dielectric layer thickness, which also affects miniaturization and mounting density on electronic devices.
Innovation Solution
The capacitor component design includes internal electrodes with different polarities, connection electrodes that penetrate the body, and upper and lower electrodes with varying thicknesses and contact areas, allowing for improved distinguishability and bending properties during mounting.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the thickness of dielectric layers and internal electrodes is decreased to increase capacitance, then capacitance is improved, but manufacturing complexity and reliability worsen due to process limitations
Solution Approach 1:
The patent applies asymmetry by making the upper electrode and lower electrode have different thicknesses. The first electrode (upper) has a first thickness while the second electrode (lower) has a second thickness different from the first. This asymmetric design allows the capacitor to achieve high capacitance without requiring uniformly thin dielectric layers throughout, thereby reducing manufacturing complexity and improving reliability while maintaining high capacitance performance.
2Quantity of substance
If the area of overlap between internal electrodes is increased to increase capacitance, then capacitance is improved, but mounting area and device size increase
Solution Approach 1:
The patent transitions from a two-dimensional approach (increasing overlap area in the plane) to a three-dimensional approach by varying the thickness of electrodes in the vertical dimension. The asymmetric electrode thicknesses create different contact areas with the body at the upper and lower surfaces, allowing high capacitance to be achieved through vertical dimensional variation rather than horizontal area expansion, thus reducing mounting area while maintaining high capacitance.
3Ease of manufacture
If upper and lower electrodes have the same thickness and contact area, then manufacturing is simplified, but distinguishability and bending properties during mounting worsen
Solution Approach 1:
The patent deliberately introduces asymmetry between the upper and lower electrodes to improve reliability during mounting. The first electrode has a different thickness than the second electrode, creating asymmetric contact areas with the body. This asymmetry provides better distinguishability between upper and lower surfaces and improves bending properties during mounting operations, while the manufacturing process remains feasible through standard ceramic capacitor fabrication techniques.
4Volume of moving object
If dielectric layer thickness is reduced to achieve miniaturization, then capacitor size is reduced, but reliability and adhesion strength worsen
Solution Approach 1:
The patent applies local quality by creating different electrode thicknesses at different locations (upper vs. lower surfaces). The asymmetric electrode design allows thinner effective dielectric paths in critical areas for capacitance while maintaining adequate thickness in other areas for mechanical strength and adhesion. This local variation in electrode dimensions enables miniaturization while preserving reliability and adhesion strength.
Data Source
AI summary
A capacitor component includes a body, a plurality of internal electrodes disposed in the body, connection electrodes extended in a thickness direction of the body and electrically connected to the plurality of internal electrodes, upper electrodes disposed on an upper surface of the body and electrically connected to the connection electrodes, and lower electrodes disposed on a lower surface of the body and electrically connected to the connection electrodes A thickness of the upper electrodes is different from that of the lower electrodes, and an area of contact between the upper electrodes and the body is different from an area of contact between the lower electrodes and the body.