Resin Substrate with Anisotropic Molecular Orientation for Controlled Bending
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Solution Overview
Problem
Conventional resin substrates with glass fibers oriented in one direction lack differentiation in physical properties between bent and unbent portions, leading to excessive bending of the entire substrate, making them less suitable for mounting on circuit boards or other substrates.
Innovation Solution
A resin substrate with an insulating base material divided into sections, where one section has a higher degree of resin molecular orientation in the Y-axis direction and another in the X-axis direction, allowing for controlled bending by applying tensile or compressive stress, thereby reducing deformation of the unbent sections.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If glass fibers are oriented in one direction throughout the entire resin substrate, then the resin substrate can be bent in a desirable direction, but the entire substrate including connection sections is prone to bending, reducing mountability
Solution Approach 1:
The patent applies local quality by creating different glass fiber orientation patterns in different regions of the resin substrate. Specifically, the first region (bending section) has glass fibers oriented to facilitate bending, while the second region (connection section) has glass fibers oriented to maintain rigidity and prevent bending. This regional differentiation allows the substrate to be bent where needed while maintaining stability in connection areas, directly resolving the contradiction between bending capability and mountability.
2Stability of the object's composition
If glass fibers are included in the entire portion of the resin layer, then the resin substrate has uniform physical properties, but the portions not to be bent are also bent, making the substrate less mountable
Solution Approach 1:
The patent implements local quality by specifying different glass fiber orientation characteristics for different regions. The first region has glass fibers oriented in directions that enable bending, while the second region has glass fibers oriented to provide rigidity and resist bending. This creates localized physical property variations that allow precise control over which portions bend and which remain stable, improving mounting precision while maintaining overall compositional stability.
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 can be easily bent in the desired direction with minimal deformation of unbent sections, enhancing its mountability on circuit boards and maintaining a desirable shape while reducing the risk of interlayer connection conductor breakage.
Implementation Method 1
a degree of resin molecular orientation in the first region in the Y-axis direction is greater than a degree of resin molecular orientation in the second section of the insulating base material in the Y-axis direction
Implementation Method 2
the resin element has a smaller linear expansion coefficient in the Y-axis direction and has a greater linear expansion coefficient in the X-axis direction orthogonal or substantially orthogonal to the Y-axis direction than the resin element having the isotropic resin molecular orientation
Data Source
AI summary
A resin substrate includes an insulating base material including opposing first and second main surfaces, at least one of which is parallel or substantially parallel to each of an X-axis direction and a Y-axis direction. The insulating base material is divided into first and second sections arranged in the X-axis direction. The first section includes, when evenly divided into three in a Z-axis direction, a first region closest to the first main surface, a second region closest to the second main surface, and a third region between the first region and the second region. A degree of resin molecular orientation in the first region in the Y-axis direction is greater than a degree of resin molecular orientation in the second section of the insulating base material in the Y-axis direction.