Opto-electric Hybrid Board Radiused Waveguide Corners
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Solution Overview
Problem
Opto-electric hybrid boards face issues with peeling off of optical waveguides due to stress differences between materials, particularly at corner portions, leading to warpage and distortions, which affects their flexibility and longevity in electronic devices.
Innovation Solution
The opto-electric hybrid board design features radiused or polygonal corner portions for the optical waveguide, with a radius of curvature ranging from 0.1 to 10.0 mm, to disperse stress-induced warpage and distortions, preventing peeling off during manufacturing and usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the optical waveguide is directly stacked on the insulation layer without a metal layer, then the flexibility of the opto-electric hybrid board is improved, but the optical waveguide peels off due to stress concentration at corner portions
Solution Approach 1:
The corner portions of the optical waveguide are designed with radiused shapes (arcuate configurations) instead of sharp corners. This curvature modification distributes stress along the arcuate shape, preventing stress concentration at corner portions and eliminating the peeling problem while maintaining board flexibility.
2Reliability
If metal layers are provided at opposite end portions for reinforcement, then the peeling resistance is improved, but the flexibility of the opto-electric hybrid board deteriorates
Solution Approach 1:
The metal layer is selectively provided only at specific locations (opposite end portions) where reinforcement is needed, while other portions maintain flexibility. The radiused corner portions further optimize this local reinforcement strategy by distributing stress without requiring extensive metal coverage.
3Manufacturing precision
If the optical waveguide has sharp corner portions, then the manufacturing precision is improved, but stress concentration occurs causing warpage and distortions
Solution Approach 1:
Sharp corner portions are replaced with radiused (arcuate) shapes. This geometric modification eliminates stress concentration points that cause warpage and distortions, while the radiused corners can still be manufactured with sufficient precision using standard fabrication techniques.
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
This configuration effectively prevents peeling off of the optical waveguide, ensuring the board's prolonged use by distributing stress along the arcuate or polygonal shapes, thereby enhancing flexibility and reliability.
Implementation Method 1
The corner portion is radiused to have an arcuate shape or having a polygonal shape produced by arranging a plurality of obtuse-angled portions in a substantially arcuate configuration... to disperse stress-induced warpage and distortions
Data Source
AI summary
An opto-electric hybrid board includes: an electric circuit board including an insulation layer having front and back surfaces, and electrical interconnect lines formed on the front surface of the insulation layer; and an optical waveguide having a substantially rectangular shape as seen in plan view and provided on the back surface of the insulation layer of the electric circuit board, with a metal layer therebetween. The optical waveguide has at least one end portion disposed in overlapping relation with the metal layer. The at least one end portion of the optical waveguide has corner portions. Each of the corner portions is radiused to have an arcuate shape or has a polygonal shape produced by arranging a plurality of obtuse-angled portions in a substantially arcuate configuration.