Flexible Board Segmented Design for Crosstalk Reduction
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Solution Overview
Problem
Conventional flexible boards used in electronic devices experience instability and crosstalk due to bending, leading to variations in high-frequency characteristics, as the size of the first sheet section increases, causing signal lines to be positioned close to other signal lines or external high-frequency circuits.
Innovation Solution
A flexible board configuration with a first sheet section, second sheet sections, and bent sheet sections, where the first bent sheet section is positioned between the second bent sheet sections, providing additional support and maintaining the shape stability, reducing crosstalk by distributing the weight and size of the first sheet section effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the first sheet section size is increased, then the signal transmission area is improved, but the shape stability deteriorates causing crosstalk
Solution Approach 1:
The flexible board is divided into multiple sheet sections (first sheet section, second sheet sections) connected by bent sheet sections. This segmentation allows the first sheet section to be larger for better signal transmission while the bent sheet sections provide structural support to maintain shape stability and prevent crosstalk.
Solution Approach 2:
The bent sheet sections act as intermediary structures between the first sheet section and the second sheet sections. These intermediary bent sections provide additional support points that stabilize the first sheet section's shape and position, preventing signal lines from moving close to other signal lines or external circuits.
2Area of stationary object
If the first sheet section size is increased, then the signal transmission capability is improved, but the deflection under weight increases causing crosstalk
Solution Approach 1:
By segmenting the flexible board into multiple sheet sections connected by bent sections, the first sheet section can be larger for better signal transmission. The bent sheet sections act as structural supports that reduce deflection under the first sheet section's own weight, preventing crosstalk.
Solution Approach 2:
The bent sheet sections serve as intermediary support structures between the first sheet section and the second sheet sections. These intermediary elements provide additional mechanical support that reduces deflection of the first sheet section under its own weight, thereby maintaining signal line positions and preventing crosstalk.
3Adaptability or versatility
If the flexible board is bent to fit the housing space, then the adaptability is improved, but the high-frequency characteristics vary between individual boards
Solution Approach 1:
The flexible board is segmented into multiple sheet sections connected by bent sections. This segmentation provides multiple reference points and support structures that maintain consistent high-frequency characteristics across individual boards even when bent to fit different housing spaces.
Solution Approach 2:
The bent sheet sections act as intermediary structures that provide consistent geometric references and mechanical support. These intermediary elements ensure that signal line positions and spacing remain consistent across different bent configurations, maintaining reliable high-frequency characteristics while adapting to various housing spaces.
Data Source
AI summary
A flexible board includes a first sheet section including a first principal surface, a second sheet section including a second principal surface and provided in a different position from the first principal surface in a normal direction to the first principal surface, at least one first bent sheet section configured to connect ends of the first and second sheet sections, the first bent sheet section including a third principal surface not parallel to the first and second principal surfaces, and at least two second bent sheet sections each including a fourth principal surface and provided in different positions from the third principal surface in a normal direction to the third principal surface. The second bent sheet sections are positioned so as to sandwich the first bent sheet section therebetween when viewed in a plan view in the normal direction to the third principal surface.