Multilayer Capacitor Terminal Electrode Thickness Profile
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Solution Overview
Problem
Multilayer capacitors face damage during laser processing for via hole formation in substrates due to irradiation of terminal electrodes, and existing designs struggle with height reduction and connection reliability.
Innovation Solution
A multilayer capacitor design with a rectangular parallelepiped element body featuring alternately disposed internal electrodes and terminal electrodes, where the terminal electrodes have specific thickness and structural configurations to minimize laser damage and enhance flatness, allowing for reduced height and improved connection reliability with substrate wiring.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of stationary object
If the terminal electrode is made thinner to reduce the height of the multilayer capacitor, then the height is reduced, but the electrode becomes more susceptible to laser beam damage
Solution Approach 1:
The patent applies local quality by creating different thickness regions within the terminal electrode structure. The electrode has a first region with a first thickness and a second region with a second thickness greater than the first thickness. This localized thickness variation allows the overall electrode height to be reduced while maintaining a thicker protective region that resists laser beam damage during via hole formation in the substrate.
2Reliability
If the terminal electrode is made thicker to resist laser beam damage, then reliability against laser damage improves, but the height of the multilayer capacitor increases
Solution Approach 1:
The terminal electrode structure implements local quality by having different thicknesses in different regions. The second region has a greater thickness than the first region, providing enhanced laser damage resistance where needed, while the first region maintains a thinner profile to control overall capacitor height. This localized differentiation resolves the contradiction between height reduction and laser damage resistance.
3Ease of manufacture
If the terminal electrode has uniform thickness, then manufacturing is simpler, but the electrode surface lacks the flatness needed for reliable wiring connections
Solution Approach 1:
The patent applies local quality by creating a non-uniform thickness distribution in the terminal electrode. The first region has a first thickness while the second region has a second thickness greater than the first thickness. This localized thickness variation improves surface flatness in critical areas for wiring connections, enhancing connection reliability while remaining compatible with standard manufacturing processes.
Data Source
AI summary
A length in a first direction of an element body is smaller than a length in a second direction of the element body and smaller than a length in a third direction of the element body, the second direction being perpendicular to the first direction, the third direction being perpendicular to the first and second direction. A difference between a maximum thickness and a minimum thickness of a first electrode portion is smaller than a difference between a maximum thickness and a minimum thickness of a second electrode portion. A difference between a maximum thickness and a minimum thickness of a third electrode portion is smaller than a difference between a maximum thickness and a minimum thickness of a fourth electrode portion. The maximum thickness of the first electrode portion and the maximum thickness of the third electrode portion are larger than thicknesses of respective outer layer portions.