Multilayer Substrate With Differential Gas Permeability Layers
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Solution Overview
Problem
Resin multilayer substrates face challenges in effectively ejecting gases generated during manufacturing and preventing moisture entry, which can lead to erosion and reduced performance.
Innovation Solution
A multilayer substrate configuration with liquid crystal polymer layers of varying gas permeability and crystallinity, where the first and third layers have higher gas permeability and lower crystallinity than the second layer, allowing gas ejection and moisture reduction, while conductive layers and protection layers enhance gas permeability and structural flexibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-generated harmful factors
If gas vent holes are provided in conductive patterns to eject gas during manufacturing, then gas ejection is improved, but moisture entry from air is increased
Solution Approach 1:
The substrate is divided into multiple layers with different gas permeability characteristics. The first and third liquid crystal polymer layers have higher gas permeability to facilitate gas ejection, while the second layer has lower gas permeability to prevent moisture entry, creating a segmented functional structure that addresses both requirements simultaneously
Solution Approach 2:
Different regions of the substrate structure are assigned different gas permeability properties. The outer layers (first and third) are designed with higher gas permeability for gas venting, while the inner layer (second) has lower gas permeability for moisture protection, creating local quality variations that resolve the contradiction between gas ejection and moisture prevention
2Object-generated harmful factors
If liquid crystal polymer layers with higher gas permeability are used, then gas ejection is improved, but structural integrity may be compromised
Solution Approach 1:
The substrate uses a composite structure of multiple liquid crystal polymer layers with different gas permeability and crystallinity characteristics. This composite material approach allows the overall structure to maintain strength while specific layers provide gas ejection functionality, resolving the contradiction between gas permeability and structural integrity
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The substrate effectively ejects gases and reduces moisture entry, maintaining structural integrity and performance by utilizing the differential gas permeability and crystallinity of the liquid crystal polymer layers, and the conductive and protection layers support this functionality.
Implementation Method 1
A gas permeability amount of the first liquid crystal polymer layer per unit volume and a gas permeability amount of the third liquid crystal polymer layer per unit volume are greater than a gas permeability amount of the second liquid crystal polymer layer per unit volume
Implementation Method 2
The at least one conductive layer includes at least one first conductive layer located between the first liquid crystal polymer layer and the second liquid crystal polymer layer and/or between the second liquid crystal polymer layer and the third liquid crystal polymer layer
Data Source
AI summary
A multilayer body includes liquid crystal polymer layers including first, second, and third liquid crystal polymer layers stacked on each other in a Z-axis direction. The first liquid crystal polymer layer is located farther toward a positive side of the Z axis than the rest of the plural liquid crystal polymer layers. The third liquid crystal polymer layer is located farther toward a negative side of the Z axis than the rest of the plural liquid crystal polymer layers. At least one first conductive layer is located between the first liquid crystal polymer layer and the second liquid crystal polymer layer and/or between the second liquid crystal polymer layer and the third liquid crystal polymer layer. A gas permeability amount of the first liquid crystal polymer layer per unit volume and that of the third liquid crystal polymer layer are greater than that of the second liquid crystal polymer layer.