Multilayer Substrate Supplementary Member for Component Overlap Stress
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Solution Overview
Problem
In multilayer substrates with densely packed electronic components, positional overlap can lead to component breakage, especially when the substrate is bent, as existing technologies do not adequately address the stress and rigidity issues in such configurations.
Innovation Solution
A multilayer substrate design incorporating a supplementary member with higher rigidity than the insulating base materials, positioned to overlap only the projected area of a first component without overlapping a second component, which helps distribute stress and prevent breakage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If components are densely packed with positional overlap in a single resin multilayer substrate, then component integration density is improved, but component breakage risk increases due to stress concentration
Solution Approach 1:
The patent transitions from a two-dimensional planar arrangement to a three-dimensional stacked arrangement by placing components at different height levels (first level and second level) within the multilayer substrate. This vertical stacking allows components to overlap in plan view while being separated in the thickness direction, achieving high integration density without direct contact that would cause breakage
Solution Approach 2:
The patent introduces a supplementary member as an intermediary element between overlapping components at different levels. This supplementary member has higher rigidity than the insulating base materials and is positioned to support the lower component while allowing the upper component to overlap its projection, thereby preventing stress transmission that would cause breakage
2Adaptability or versatility
If the substrate is made flexible to allow bending, then adaptability is improved, but stress on overlapping components increases causing breakage
Solution Approach 1:
The patent applies local quality by creating regions of different rigidity within the substrate. The supplementary member provides localized high rigidity exactly where components overlap vertically, while other regions maintain the flexibility of the insulating base materials. This localized reinforcement prevents breakage at critical points without compromising overall substrate flexibility
Solution Approach 2:
The patent uses composite material structure by combining insulating base materials with a supplementary member having different mechanical properties (higher rigidity). This composite construction allows the substrate to exhibit both flexibility from the base materials and localized strength from the supplementary member, resolving the contradiction between flexibility and breakage resistance
Data Source
AI summary
A multilayer substrate comprises: a stack having a plurality of insulating base materials; a first component arranged within the stack at a first level in a thickness direction of the stack; a second component arranged within the stack at a second level different from the first level and arranged so that, in a plan view, at least a portion of the second component overlaps with a portion of the first component; and a supplementary member arranged to at least partly exist in a range, in a thickness direction, as high as or higher than a lower end of the second component and as high as or lower than an upper end of the second component, and in a plan view, within a region of a projected area of the first component not overlapped with the second component, the supplementary member having a rigidness higher than the insulating base materials.